Patent Publication Number: US-2022231959-A1

Title: Data transmission control method and device, and non-transitory computer-readable medium

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS 
     This application claims priority to a Chinese patent application No. 202110067711.0 filed on Jan. 19, 2021, the disclosure of which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to the field of data processing technology and, in particular, to a data transmission control method and device, and a non-transitory computer-readable medium. 
     BACKGROUND 
     At present, the conventional electronic cigarette (also known as e-cigarette) on the market is not equipped with a display screen, and as a result, users cannot directly view the current usage data of the e-cigarette. 
     In some existing hand-held electronic devices whose main purpose is not to display information, a display screen would be mounted on these hand-held electronic devices to enable users to directly view usage data or related information of the electronic device. Such a hand-held electronic device whose main purpose is not to display information, for example, is the e-cigarette, and some existing e-cigarettes are equipped with a display so that users can visually check the current status of the e-cigarette. The conventional display screen algorithm is to traverse each pixel point and refresh and display separately each pixel point. If a to-be-displayed picture is relatively large, a control chip transmits image data bit by bit to the display screen so that the number of transmissions is large. For example, for one picture having a size of 74088 bytes, a serial peripheral interface (SPI) needs to be driven to perform transmission 74088 times. Each transmission requires processes such as protocol preparation, start, and end, which takes a long time, thereby causing slow picture display or slow picture refresh speed and low display efficiency. 
     SUMMARY 
     Embodiments of the present disclosure provide a data transmission control method and device to improve the data transmission efficiency, shorten the data transmission time, and meet screen refresh speed requirements. 
     In a first aspect, the embodiments of the present disclosure provide a data transmission control method. The method includes the steps described below. 
     A multiple and a remainder are determined according to a total data size of to-be-transmitted data and a set byte size, where the multiple is equal to a quotient obtained by dividing the total data size by the set byte size, and the remainder is equal to a remainder obtained by dividing the total data size by the set byte size. 
     Data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data is sequentially transmitted by transmitting data of the set byte size each time. 
     In response to the remainder being not zero, the remaining data whose size is the remainder in the to-be-transmitted data is transmitted. 
     Furthermore, before the multiple and the remainder are determined according to the total data size of the to-be-transmitted data and the set byte size, the method further includes the step described below. 
     The set byte size is determined according to a protocol type of an input source of the to-be-transmitted data. 
     Furthermore, before the data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data is sequentially transmitted by transmitting the data of the set byte size each time, the method further includes the steps described below. 
     A buffer whose size is the set byte size is set in a memory. 
     The buffer is connected to a memory of a reception module through a direct memory access controller. 
     A transmission interface is enabled. 
     Accordingly, the step in which the data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data is sequentially transmitted by transmitting the data of the set byte size each time includes the steps described below. 
     The buffer is updated for times of the multiple in real time in a manner of sequentially storing data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data into the buffer by copying the data of the set byte size to the buffer each time. 
     The data in buffer updated for times of the multiple is written into the memory of the reception module through the direct memory access controller by writing the data of the set byte size in the buffer into the memory of the reception module through the direct memory access controller each time. 
     The step in which, in response to the remainder being not zero, the remaining data whose size is the remainder in the to-be-transmitted data is transmitted includes the steps described below. 
     In response to the remainder being not zero, the remaining data whose size is the remainder in the to-be-transmitted data is copied to the buffer. 
     The remaining data whose size is the remainder in the buffer is written into the memory of the reception module through the direct memory access controller. 
     Furthermore, the transmission interface includes at least one of: a serial peripheral interface (SPI) or an inter-integrated circuit (I2C) bus. 
     Furthermore, before the multiple and the remainder are determined according to the total data size of the to-be-transmitted data and the set byte size, the method further includes the step described below. 
     A to-be-superimposed picture is superimposed to a background picture to synthesize a to-be-displayed picture, which includes the steps described below. 
     A color value of each first pixel point in the to-be-superimposed picture is judged in sequence. 
     In response to a color value of a first pixel point being a set color value, the color value of the first pixel point is replaced with a color value of a second pixel point corresponding to a position of the first pixel point in the background picture. 
     In response to the color value of the first pixel point being not the set color value, the color value of the first pixel point is retained. 
     The to-be-displayed picture is used as the to-be-transmitted data. 
     In a second aspect, the embodiments of the present disclosure further provide a data transmission control device. The device includes a first determination unit, an equivalence transmission unit, and a remaining transmission unit. 
     The first determination unit is configured to determine a multiple and a remainder according to a total data size of to-be-transmitted data and a set byte size, where the multiple is equal to a quotient obtained by dividing the total data size by the set byte size, and the remainder is equal to a remainder obtained by dividing the total data size by the set byte size. 
     The equivalence transmission unit is configured to sequentially transmit data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data by transmitting data of the set byte size each time. 
     The remaining transmission unit is configured to, in response to the remainder being not zero, transmit the remaining data whose size is the remainder in the to-be-transmitted data. 
     Furthermore, the data transmission control device further includes a second determination unit. 
     The second determination unit is configured to determine the set byte size according to a protocol type of an input source of the to-be-transmitted data. 
     Furthermore, the data transmission control device further includes a buffer setting unit, a connection unit, and an enabling unit. 
     The buffer setting unit is configured to set a buffer whose size is the set byte size in a memory. 
     The connection unit is configured to connect the buffer to a memory of a reception module through a direct memory access controller. 
     The enabling unit is configured to enable a transmission interface. 
     The equivalence transmission unit includes an update sub-unit and a successive writing sub-unit. 
     The update sub-unit is configured to update the buffer for times of the multiple in real time in a manner of sequentially storing data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data into the buffer by copying the data of the set byte size to the buffer each time. 
     The successive writing sub-unit is configured to write the data in buffer updated for times of the multiple into the memory of the reception module through the direct memory access controller by writing the data of the set byte size in the buffer into the memory of the reception module through the direct memory access controller each time. 
     The remaining transmission unit includes a copying sub-unit and a remaining writing sub-unit. 
     The copying sub-unit is configured to, in response to the remainder being not zero, copy the remaining data whose size is the remainder in the to-be-transmitted data to the buffer. 
     The remaining writing sub-unit is configured to write the remaining data whose size is the remainder in the buffer into the memory of the reception module through the direct memory access controller. 
     Furthermore, the transmission interface includes at least one of: an SPI or an I2C bus. 
     Furthermore, the data transmission control device further includes a picture synthesizing module. 
     The picture synthesizing module is configured to, before the multiple and the remainder are determined according to the total data size of the to-be-transmitted data and the set byte size, superimpose a to-be-superimposed picture to a background picture to synthesize a to-be-displayed picture. 
     The picture synthesizing module includes a pixel point traversal unit, a replacement unit, a retaining unit, and a data generation unit. 
     The pixel point traversal unit is configured to judge a color value of each first pixel point in the to-be-superimposed picture in sequence. 
     The replacement unit is configured to, in response to a color value of a first pixel point being a set color value, replace the color value of the first pixel point with a color value of a second pixel point corresponding to a position of the first pixel point in the background picture. 
     The retaining unit is configured to, in response to the color value of the first pixel point being not the set color value, retain the color value of the first pixel point. 
     The data generation unit is configured to use the to-be-displayed picture as the to-be-transmitted data. 
     In the technical solution of the embodiments of the present disclosure, a multiple and a remainder are determined according to a total data size of to-be-transmitted data and a set byte size, where the multiple is equal to a quotient obtained by dividing the total data size by the set byte size, and the remainder is equal to a remainder obtained by dividing the total data size by the set byte size; data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data is sequentially transmitted by transmitting data of the set byte size each time; and in response to the remainder being not zero, remaining data whose size is the remainder in the to-be-transmitted data is transmitted. In this way, the equivalent amount of data is continuously transmitted for multiple times so that the size of the transmission packet transmitted each time is consistent, which avoids frequent unpacking, packing, and checking processing and saves the time of unpacking and packing, and finally the remaining data whose size is less than the set byte size is transmitted. Therefore, the transmission times are reduced, and the time consumed in the process such as protocol preparation is reduced, thereby improving the data transmission efficiency, shortening the data transmission time, and improving the screen refresh speed. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a flowchart of a data transmission control method according to an embodiment of the present disclosure; 
         FIG. 2  is a flowchart of another data transmission control method according to an embodiment of the present disclosure; 
         FIG. 3  is a schematic diagram of an application scenario according to an embodiment of the present disclosure; 
         FIG. 4  is a flowchart of another data transmission control method according to an embodiment of the present disclosure; 
         FIG. 5  is a flowchart of another data transmission control method according to an embodiment of the present disclosure; 
         FIG. 6  is a schematic diagram of a to-be-superimposed picture according to an embodiment of the present disclosure; 
         FIG. 7  is a schematic diagram of a background picture according to an embodiment of the present disclosure; 
         FIG. 8  is a schematic diagram of a to-be-displayed picture synthesized according to an embodiment of the present disclosure; 
         FIG. 9  is a flowchart of another data transmission control method according to an embodiment of the present disclosure; 
         FIG. 10  is a structural diagram of a data transmission control device according to an embodiment of the present disclosure; 
         FIG. 11  is a structural diagram of another data transmission control device according to an embodiment of the present disclosure; and 
         FIG. 12  is a structural diagram of a control device according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter the present disclosure will be further described in detail in conjunction with the drawings and embodiments. It is to be understood that the specific embodiments set forth below are intended to illustrate and not to limit the present disclosure. Additionally, it is to be noted that, for ease of description, only part, not all, of the structures related to the present disclosure are illustrated in the drawings. 
     An embodiment of the present disclosure provides a data transmission control method.  FIG. 1  is a flowchart of a data transmission control method according to an embodiment of the present disclosure. The method may be performed by a data transmission control device. The device may be implemented by software and/or hardware and may be integrated in a control chip having a data transmission control function, such as a control chip of a hand-held electronic device. The data transmission control method specifically includes steps  110 ,  120 , and  130 . 
     In step  110 , a multiple and a remainder are determined according to a total data size of to-be-transmitted data and a set byte size, where the multiple is equal to a quotient obtained by dividing the total data size by the set byte size, and the remainder is equal to a remainder obtained by dividing the total data size by the set byte size. 
     The to-be-transmitted data may be image data. The set byte size may include 256 bytes or 512 bytes. The set byte size may be set as needed, which is not limited in the embodiments of the present disclosure. 
     It is to be noted that Q/N=M K, where the total data size is Q, the set byte size is N, the multiple is M, and the remainder is K, and Q=N×M+K. The multiplier may be calculated by the shifting algorithm and other algorithms. The remainder K may be calculated by performing an algorithm such as an AND operation on Q and a hexadecimal number 0x00FF. Exemplarily, when Q is a decimal number 43248 and the set byte size N is a decimal number 256, then M is a decimal number 168, and K is a decimal number 240, where the units may be bytes. 
     In step  120 , data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data is sequentially transmitted by transmitting data of the set byte size each time. 
     Data of (N×M) bytes in the to-be-transmitted data is sequentially transmitted to a reception module by transmitting data of N bytes each time, that is, the transmission is performed for M times. In other words, M target transmission packets whose size is the set byte size are sequentially transmitted. The equivalent amount (that is, N bytes) of data is transmitted each time so that the size of the transmission packet transmitted each time is consistent, which avoids frequent unpacking, packing, and checking processing, saves the time of unpacking and packing, reduces the transmission times, and reduces the time consumed in the process such as protocol preparation, thereby improving the data transmission efficiency, shortening the data transmission time, and improving the screen refresh speed. The set byte size may be a multiple of 256, and then the refresh speed can reach a multiple of 256 or above. 
     In step  130 , in response to the remainder being not zero, the remaining data whose size is the remainder in the to-be-transmitted data is transmitted. 
     After the data of (N×M) bytes in the to-be-transmitted data is sequentially transmitted to the reception module, the remaining data of K bytes in the to-be-transmitted data is transmitted to the reception module, and in this way, the to-be-transmitted data whose total data amount is Q bytes is transmitted to the reception module. If the remainder is zero, there is no need to perform step  130 . 
     In the technical solution of the embodiment, a multiple and a remainder are determined according to a total data size of to-be-transmitted data and a set byte size, where the multiple is equal to a quotient obtained by dividing the total data size by the set byte size, and the remainder is equal to a remainder obtained by dividing the total data size by the set byte size; data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data is sequentially transmitted by transmitting data of the set byte size each time; and in response to the remainder being not zero, remaining data whose size is the remainder in the to-be-transmitted data is transmitted. In this way, the equivalent amount of data is continuously transmitted for multiple times so that the size of the transmission packet transmitted each time is consistent, which avoids frequent unpacking, packing, and checking processing and saves the time of unpacking and packing, and finally the remaining data whose size is less than the set byte size is transmitted. 
     Therefore, the transmission times are reduced, and the time consumed in the process such as protocol preparation is reduced, thereby improving the data transmission efficiency, shortening the data transmission time, and improving the screen refresh speed. 
     An embodiment of the present disclosure provides another data transmission control method.  FIG. 2  is a flowchart of another data transmission control method according to an embodiment of the present disclosure. The present embodiment is optimized on the basis of the above-mentioned embodiment and provides a method of determining the set byte size. On the basis of the above-mentioned embodiment, the data transmission control method includes steps  210 ,  220 ,  230 , and  240 . 
     In step  210 , the set byte size is determined according to a protocol type of an input source of the to-be-transmitted data. 
     The input source may be a source of the to-be-transmitted data. As the input sources are different, the size and format of the to-be-transmitted data packets are different. The maximum transmission units (MTUs) of the protocol types of different input sources are different, and then the set byte size may be different. Optionally, the protocol type of the input source includes at least one of: a Bluetooth protocol, a Universal Serial Bus (USB) protocol, or a flash memory (Flash) protocol. The correspondence between the set byte size and the protocol type of the input source may be pre-established for the determination of the set byte size according to the protocol type of the input source of the to-be-transmitted data and the correspondence between the set byte size and the protocol type of the input source. 
       FIG. 3  is a schematic diagram of an application scenario according to an embodiment of the present disclosure. The application scenario is, for example, but not limited to, the application in the hand-held electronic device whose main purpose is not to display information but which is equipped with a display screen, for example, such a hand-held electronic device is an e-cigarette equipped with a control chip  1  and a display screen  2 . The microcontroller Cortex-M in the control chip  1  may be used for performing the data transmission control method provided by the present embodiment of the present disclosure. The input source  3  may be provided with a Bluetooth (BLE). The input source  3  may transmit to-be-transmitted data to the control chip  1  through the BLE, and then the control chip  1  transmits the to-be-transmitted data to the display screen  2 . The input source  4  may be provided with a USB. The input source  4  may transmit to-be-transmitted data to the control chip  1  through the USB, and then the control chip  1  transmits the to-be-transmitted data to the display screen  2 . The input source may also be the flash memory (Flash) in the control chip  1 . The control chip  1  transmits the to-be-transmitted data in the Flash to the display screen  2 . The input source unpacks picture data and sequentially transmits the unpacked packets (that is, transmission units) to the control chip  1 . The control chip  1  receives the unpacked packets, combines the unpacked packets and puts them into the random access memory (RAM) of the control chip  1 , and then transmits them to the display screen  2 . 
     Optionally, if the protocol type of the input source of the to-be-transmitted data is Bluetooth BLE4.0 whose MTU is 23 bytes and the set byte size is 256 bytes, transmission packets received from the input source may be combined into several target transmission packets whose size is the set byte size and then the target transmission packets are transmitted sequentially to ensure that the transmission packets at each stage are consistent in size, thereby saving the time for unpacking and packing, reducing the number of transmissions, and reducing the time consumed in the process such as protocol preparation. Optionally, if the protocol type of the input source of the to-be-transmitted data is Bluetooth BLE4.1 whose MTU is 241 bytes and the set byte size is 256 bytes, transmission packets received from the input source may be combined into several target transmission packets whose size is the set byte size and then the target transmission packets are transmitted sequentially to ensure that the transmission packets at each stage are consistent in size, thereby saving the time for unpacking and packing, reducing the number of transmissions, and reducing the time consumed in the process such as protocol preparation. 
     Optionally, if the protocol type of the input source of the to-be-transmitted data is Bluetooth BLE4.2 whose MTU is 512 bytes and the set byte size is 512 bytes, transmission packets received from the input source may be combined into several target transmission packets whose size is the set byte size and then the target transmission packets are transmitted sequentially to ensure that the transmission packets at each stage are consistent in size, thereby saving the time for unpacking and packing, reducing the number of transmissions, and reducing the time consumed in the process such as protocol preparation. Optionally, if the protocol type of the input source of the to-be-transmitted data is the Flash protocol and the set byte size is 256 bytes, transmission packets received from the input source may be combined into several target transmission packets whose size is the set byte size and then the target transmission packets are transmitted sequentially to ensure that the transmission packets at each stage are consistent in size, thereby saving the time for unpacking and packing, reducing the number of transmissions, and reducing the time consumed in the process such as protocol preparation. 
     In step  220 , a multiple and a remainder are determined according to a total data size of to-be-transmitted data and the set byte size, where the multiple is equal to a quotient obtained by dividing the total data size by the set byte size, and the remainder is equal to a remainder obtained by dividing the total data size by the set byte size. 
     In step  230 , data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data is sequentially transmitted by transmitting data of the set byte size each time. 
     In step  240 , in response to the remainder being not zero, the remaining data whose size is the remainder in the to-be-transmitted data is transmitted. 
     An embodiment of the present disclosure provides another data transmission control method.  FIG. 4  is a flowchart of another data transmission control method according to an embodiment of the present disclosure. The present embodiment is optimized on the basis of the above-mentioned embodiments and provides a transmission method based on a direct memory access controller. On the basis of the above-mentioned embodiment, the data transmission control method includes steps  310  to  380 . 
     In step  310 , a multiple and a remainder are determined according to a total data size of to-be-transmitted data and the set byte size, where the multiple is equal to a quotient obtained by dividing the total data size by the set byte size, and the remainder is equal to a remainder obtained by dividing the total data size by the set byte size. 
     In step  320 , a buffer whose size is the set byte size is set in a memory. 
     With reference to  FIG. 3 , a buffer whose size is the set byte size may be set in the RAM in the control chip  1 , and the data in the buffer is transmitted as a customized data packet. The buffer is used for storing data for a short period. 
     In step  330 , the buffer is connected to a memory of a reception module through a direct memory access controller. 
     The direct memory access (DMA) controller is used for providing high speed data transmission between a peripheral and a memory or between a memory and another memory. The reception module may be a display screen. The display screen may be a liquid crystal display (LCD) screen or an organic light-emitting diode (OLED) display screen. With reference to  FIG. 3 , the buffer is connected to the memory of the display screen  2 , that is, Graphics Random (GRAM), through the direct memory access (DMA) controller. The microcontroller Cortex-M, the direct memory access controller, the flash memory (Flash), the memory RAM, and the serial peripheral interface (SPI) in the control chip  1  may be connected to each other through an advanced high-performance bus (AHB). The display controller in the display screen  2  refreshes the memory GRAM for display. 
     In step  340 , a transmission interface is enabled. 
     Optionally, the transmission interface includes at least one of: an SPI or an I2C bus. Exemplarily, with reference to  FIG. 3 , after the serial peripheral interface (SPI) is enabled, the data is transmitted through the SPI, and the data transmission is controlled by using the DMA controller. In this process, a small number of resources of the microcontroller Cortex-M (also called CPU) are occupied, thereby avoiding a case in which the CPU cannot respond to other events in the process of displaying a picture because CPU resources are exclusively occupied when the data is transmitted through the SPI only. 
     For example, the e-cigarette is equipped with a display screen so that users can visually check the current status of the e-cigarette. The display screen and the control chip in the e-cigarette communicate with each other through SPI and I2C protocols or other protocols. The SPI is used for transmitting display data. The SPI is a high-speed, full-duplex, synchronous communication bus and performs transmission through four lines, that is, SDI (data input), SDO (data output), SCLK (clock), and CS (Chip Select, slave device enable signals, controlled by the master device). The I2C bus performs transmission through two lines, that is, SDA (serial data line) and SCL (serial clock line), and the main advantages of the I2C bus are simplicity, effectiveness, low power consumption, and strong anti-interference. 
     In step  350 , the buffer is updated for times of the multiple in real time in a manner of sequentially storing data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data into the buffer by copying the data of the set byte size to the buffer each time. 
     The buffer is updated for times of the multiple in real time in a manner of sequentially storing data of (N×M) bytes in the to-be-transmitted data into the buffer by copying the data of N bytes to the buffer each time. After the data of N bytes is copied to the buffer, the data of N bytes in the buffer is written into the memory of the reception module through the direct memory access controller. 
     In step  360 , the data in buffer updated for times of the multiple is written into the memory of the reception module through the direct memory access controller by writing the data of the set byte size in the buffer into the memory of the reception module through the direct memory access controller each time. In some embodiments, the data in buffer updated for times of the multiple is written into the memory of the reception module through the transmission interface by the direct memory access controller. In some embodiments, the data in buffer updated each time is sequentially written into the memory of the reception module through the direct memory access controller. 
     The data in buffer updated for times of the multiple is written into the memory of the reception module through the direct memory access controller by writing the data of N bytes in the buffer into the memory of the reception module through the direct memory access controller each time. After the data of N bytes in the buffer is written into the memory of the reception module through the direct memory access controller for certain times, if there is uncopied data in the data of (N×M) bytes in the to-be-transmitted data, data of N bytes in the uncopied data is copied to the buffer until there is no uncopied data in the data of (N×M) bytes in the to-be-transmitted data. 
     In step  370 , in response to the remainder being not zero, the remaining data whose size is the remainder in the to-be-transmitted data is copied to the buffer. 
     If the remainder is not zero, the remaining data of K bytes in the to-be-transmitted data is copied to the buffer. 
     In step  380 , the remaining data whose size is the remainder in the buffer is written into the memory of the reception module through the direct memory access controller. 
     The remaining data of K bytes in the buffer is written into the memory of the reception module through the direct memory access controller. If the remainder is zero, there is no need to perform steps  370  and  380 . 
     An embodiment of the present disclosure provides another data transmission control method.  FIG. 5  is a flowchart of another data transmission control method according to an embodiment of the present disclosure. On the basis of the above-mentioned embodiment, the data transmission control method includes steps  410 ,  420 ,  430 , and  440 . 
     In step  410 , a to-be-superimposed picture is superimposed to a background picture to synthesize a to-be-displayed picture, where the to-be-displayed picture is used as the to-be-transmitted data. 
     The to-be-superimposed picture includes at least two colors, including an original background color and a color corresponding to display information. The display information may include at least one of number information or text information corresponding to functions such as time display, charging display, data statistics, and the like of the e-cigarette. The original background color of the to-be-superimposed picture is single and not aesthetically pleasing. The background picture may include graphics, etc.  FIG. 6  is a schematic diagram of a to-be-superimposed picture according to an embodiment of the present disclosure, and  FIG. 6  illustrates a case in which the original background color of the to-be-superimposed picture is pure black.  FIG. 7  is a schematic diagram of a background picture according to an embodiment of the present disclosure.  FIG. 8  is a schematic diagram of a to-be-displayed picture synthesized according to an embodiment of the present disclosure. As shown in  FIGS. 6 to 8 , the to-be-superimposed picture is superimposed to the background picture, which is equivalent to replacing pixel points of the original background color in the to-be-superimposed picture with pixel points at the corresponding positions in the background picture, or equivalent to replacing pixel points in the background picture that are not in the original background color with pixel points at the corresponding positions in the to-be-superimposed picture. 
     In step  420 , a multiple and a remainder are determined according to a total data size of to-be-transmitted data and the set byte size, where the multiple is equal to a quotient obtained by dividing the total data size by the set byte size, and the remainder is equal to a remainder obtained by dividing the total data size by the set byte size. 
     In step  430 , data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data is sequentially transmitted by transmitting data of the set byte size each time. 
     In step  440 , in response to the remainder being not zero, the remaining data whose size is the remainder in the to-be-transmitted data is transmitted. 
     An embodiment of the present disclosure provides another data transmission control method.  FIG. 9  is a flowchart of another data transmission control method according to an embodiment of the present disclosure. In the embodiment, the to-be-superimposed picture includes a plurality of first pixel points, and the background picture includes a plurality of second pixel points. On the basis of the above-mentioned embodiment, the data transmission control method includes steps  510  to  570 . 
     In step  510 , a color value of each first pixel point in the to-be-superimposed picture is judged in sequence. 
     Exemplarily, the color value of each first pixel point may be represented by data of 2 bytes, that is, the color value is represented by data of 16 bits, where the first 5 bits represent red, the middle 5 bits represent green, and the last 6 bits represent blue. 
     In step  520 , in response to a color value of a first pixel point being a set color value, the color value of the first pixel point is replaced with a color value of a second pixel point corresponding to a position of the first pixel point in the background picture. 
     The set color value may, but is not limited to, be black. The background picture may include a plurality of second pixel points. The positions of the first pixel points and the positions of the second pixel points are in one-to-one correspondence. If the color value of one first pixel point is the set color value, it indicates that this first pixel point is the original background color of the to-be-superimposed picture, like the black area shown in  FIG. 6 . The color value of this first pixel point is replaced with a color value of a second pixel point corresponding to a position of this first pixel point in the background picture, and the color value of the second pixel point corresponding to the position of this first pixel point in the background picture is used as a color value corresponding to the position of this first pixel point in the synthesized to-be-displayed picture. Exemplarily, if the color value of a current first pixel point is 0X0000, which means that the current first pixel point is pure black, the color value of a second pixel point corresponding to the current first pixel point in the background picture is replaced with the current pure black, and the color value of the corresponding second pixel point in the background picture is added to the to-be-transmitted data (that is, the array of display data). 
     In step  530 , in response to the color value of the first pixel point being not the set color value, the color value of the first pixel point is retained. 
     If the color value of one first pixel point is not the set color value, for example, first pixel points corresponding to numbers “8726” and “412” in  FIG. 6 , it indicates that this first pixel point is not the original background color of the to-be-superimposed picture but the color corresponding to display information. At this point, the color value of this first pixel point is retained as a color value corresponding to the position of this first pixel point in the synthesized to-be-displayed picture. Exemplarily, if the color value of a current first pixel point is not 0X0000, which means that the current first pixel point is not pure black, the color value of the current first pixel point is added to the to-be-transmitted data (that is, the array of display data). 
     In step  540 , the to-be-displayed picture is used as the to-be-transmitted data. 
     The to-be-transmitted data is transmitted to be displayed in the display screen. Through the above-mentioned steps, the to-be-superimposed picture is subjected to transparent color processing to meet the interface display requirements. 
     In step  550 , a multiple and a remainder are determined according to a total data size of to-be-transmitted data and the set byte size, where the multiple is equal to a quotient obtained by dividing the total data size by the set byte size, and the remainder is equal to a remainder obtained by dividing the total data size by the set byte size. 
     In step  560 , data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data is sequentially transmitted by transmitting data of the set byte size each time. 
     In step  570 , in response to the remainder being not zero, the remaining data whose size is the remainder in the to-be-transmitted data is transmitted. 
     An embodiment of the present disclosure provides a data transmission control device. 
       FIG. 10  is a structural diagram of a data transmission control device according to an embodiment of the present disclosure. The device is suitable for executing the data transmission control method provided by the embodiments of the present disclosure. On the basis of the above-mentioned embodiments, the data transmission control device includes a first determination unit  610 , an equivalence transmission unit  620 , and a remaining transmission unit  630 . 
     The first determination unit  610  is configured to determine a multiple and a remainder according to a total data size of to-be-transmitted data and a set byte size, where the multiple is equal to a quotient obtained by dividing the total data size by the set byte size, and the remainder is equal to a remainder obtained by dividing the total data size by the set byte size. The equivalence transmission unit  620  is configured to sequentially transmit data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data by transmitting data of the set byte size each time. The remaining transmission unit  630  is configured to, in response to the remainder being not zero, transmit the remaining data whose size is the remainder in the to-be-transmitted data. 
     The data transmission control device provided by the embodiment of the present disclosure can execute the data transmission control method provided by the embodiments of the present disclosure. Therefore, the data transmission control device provided by the embodiment of the present disclosure also has the beneficial effects described in the above-mentioned embodiments, and details are not repeated herein. 
     Optionally, on the basis of the above-mentioned embodiment,  FIG. 11  is a structural diagram of another data transmission control device according to an embodiment of the present disclosure. The transmission control device further includes a second determination unit  640 , which is configured to determine the set byte size according to a protocol type of an input source of the to-be-transmitted data. 
     Optionally, on the basis of the above-mentioned embodiments, with continued reference to  FIG. 11 , the data transmission control device further includes a buffer setting unit  650 , a connection unit  660 , and an enabling unit  670 . 
     The buffer setting unit  650  is configured to set a buffer whose size is the set byte size in a memory. The connection unit  660  is configured to connect the buffer to a memory of a reception module through a direct memory access controller. The enabling unit  670  is configured to enable a transmission interface. 
     Optionally, on the basis of the above-mentioned embodiments, with continued reference to  FIG. 11 , The equivalence transmission unit  620  includes an update sub-unit  621  and a successive writing sub-unit  622 . The update sub-unit  621  is configured to update the buffer for times of the multiple in real time in a manner of sequentially storing data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data into the buffer by copying the data of the set byte size to the buffer each time. The successive writing sub-unit  622  is configured to write the data in buffer updated for times of the multiple into the memory of the reception module through the direct memory access controller by writing the data of the set byte size in the buffer into the memory of the reception module through the direct memory access controller each time. 
     Optionally, on the basis of the above-mentioned embodiments, with continued reference to  FIG. 11 , the remaining transmission unit  630  further includes a copying sub-unit  631  and a remaining writing sub-unit  632 . 
     The copying sub-unit  631  is configured to, in response to the remainder being not zero, copy the remaining data whose size is the remainder in the to-be-transmitted data to the buffer. 
     The remaining writing sub-unit  632  is configured to write the remaining data whose size is the remainder in the buffer into the memory of the reception module through the direct memory access controller. 
     Optionally, the transmission interface includes at least one of: an SPI or an I2C bus. 
     Optionally, on the basis of the above-mentioned embodiments, with continued reference to  FIG. 11 , the data transmission control device further includes a picture synthesizing module  680 , which is configured to, before the multiple and the remainder are determined according to the total data size of the to-be-transmitted data and the set byte size, superimpose a to-be-superimposed picture to a background picture to synthesize a to-be-displayed picture. 
     Optionally, on the basis of the above-mentioned embodiment, with continued reference to  FIG. 11 , the picture synthesizing module  680  includes a pixel point traversal unit  681 , a replacement unit  682 , a retaining unit  683 , and a data generation unit  684 . 
     The pixel point traversal unit  681  is configured to judge a color value of each first pixel point in the to-be-superimposed picture in sequence. The replacement unit  682  is configured to, in response to a color value of a first pixel point being a set color value, replace the color value of the first pixel point with a color value of a second pixel point corresponding to a position of the first pixel point in the background picture. The retaining unit  683  is configured to, in response to the color value of the first pixel point being not the set color value, retain the color value of the first pixel point. The data generation unit  684  is configured to use the to-be-displayed picture as the to-be-transmitted data. 
     The above-mentioned data transmission control device can execute the data transmission control method provided by any one of the embodiments of the present disclosure and has functional modules and beneficial effects corresponding to the execution method. 
       FIG. 12  is a structural diagram of a control device according to an embodiment of the present disclosure. As shown in  FIG. 12 , the control device includes a processor  70 , a memory  71 , an input device  72 , and an output device  73 . The number of processors  70  in the control device may be one or more, and  FIG. 12  is illustrated by using an example of one processor  70 . The processor  70 , the memory  71 , the input device  72 , and the output device  73  in the control device may be connected to each other through a bus or in other ways, and  FIG. 12  is illustrated by using an example in which the above components in the control device are connected through a bus. 
     The memory  71 , as a computer-readable storage medium, may be configured to store software programs and computer-executable programs and modules such as program instructions/modules corresponding to the data transmission control method in the embodiments of the present disclosure (for example, the data transmission control device includes a first determination unit  610 , an equivalence transmission unit  620 , and a remaining transmission unit  630 ). The processor  70  executes software programs, instructions and modules stored in the memory  71  to execute various function applications and data processing of the control device, that is, to implement the data transmission control method described above. 
     The memory  71  may mainly include a program storage area and a data storage area. The program storage area may store an operating system and an application program required by at least one function. The data storage area may store data created based on the use of the terminal. Furthermore, the memory  71  may include a high speed random access memory, and may also include a nonvolatile memory such as at least one disk memory, flash memory or another nonvolatile solid state memory. In some examples, the memory  71  may further include memories located remotely relative to the processor  70 , and these remote memories may be connected to the control device via networks. The examples of the preceding network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. 
     The input device  72  may be configured to receive inputted digital or character information and generate key signal input related to user settings and function control of the control device, and for example, may include an external Flash and the like. The output device  73  may include display devices such as a display screen. 
     An embodiment of the present disclosure further provides a storage medium, e.g., a non-transitory computer-readable medium, including computer-executable or computer-readable instructions that are used for, when executed by a computer processor, implementing a data transmission control method. The method includes the steps described below. 
     A multiple and a remainder are determined according to a total data size of to-be-transmitted data and a set byte size, where the multiple is equal to a quotient obtained by dividing the total data size by the set byte size, and the remainder is equal to a remainder obtained by dividing the total data size by the set byte size. 
     Data whose size is the set byte size multiplied by the multiple in the to-be-transmitted data is sequentially transmitted by transmitting data of the set byte size each time. 
     In response to the remainder being not zero, the remaining data whose size is the remainder in the to-be-transmitted data is transmitted. 
     Of course, in the storage medium including computer-executable instructions provided by the embodiment of the present disclosure, the computer-executable instructions can implement not only the above-mentioned method operations but also related operations in the data transmission control method provided by any one of the embodiments of the present disclosure. 
     From the description of the above-mentioned implementations, it will be apparent to those skilled in the art that the present disclosure may be implemented by means of software plus necessary general-purpose hardware, or may, of course, be implemented by hardware. However, in many cases, the former is a preferred implementation. Based on this understanding, the technical solutions provided by the present disclosure substantially, or the part contributing to the related art, may be embodied in the form of a software product. The software product may be stored in a computer-readable storage medium, such as a computer floppy disk, a read-only memory (ROM), a random access memory (RAM), a flash, a hard disk or an optical disk, and includes several instructions for enabling a computer device (which may be a personal computer, a server or a network device) to execute the methods provided by the embodiments of the present disclosure. 
     It is to be noted that units and modules involved in the embodiment of the above-mentioned device are just divided according to functional logic, and the division is not limited to this, as long as the corresponding functions can be implemented. In addition, the specific names of functional units are just intended to distinguish, and not to limit the scope of the present disclosure. 
     It is to be noted that the above are merely preferred embodiments of the present disclosure and the principles used therein. It will be understood by those skilled in the art that the present disclosure is not limited to the specific embodiments described herein. Those skilled in the art can make various apparent modifications, adaptations, combinations and substitutions without departing from the scope of the present disclosure. Therefore, while the present disclosure has been described in detail through the above-mentioned embodiments, the present disclosure is not limited to the above-mentioned embodiments and may include more other equivalent embodiments without departing from the concept of the present disclosure. The scope of the present disclosure is determined by the scope of the appended claims.