arbitrary waveform with STM32  - Page 1
Forum section: electronics / beginners

author: Mark522
author_rank: Newbie
timestamp: March 27, 2019, 01:29:41 pm
content: Hello EEVbloggers,This is my first post as I just joined the community.I recently bought a STM32 Nucleo F767ZI board by ST Microelectronics. I am using HAL functions with Cubemx now i need to generate an arbitrary waveform. for this I have created a array of 6 words for two waveform patternsto be send to TIM1 channel 1 using DMA (TIM1_ARR, TIM1_RCR, TIM1_CCR1) This is how the basics look uint32_t aSRC_Buffer = { 2000,1,800,3000,2,200};/// ARR, RCR, CCR1.. This is the HAL function: HAL_TIM_DMABurst_WriteStart(&htim1,TIM_DMABASE_ARR,TIM_DMA_UPDATE,(uint32_t *)aSRC_Buffer, TIM_DMABURSTLENGTH_3TRANSFERS);. this it dose not fuction and i cant see the Signal.Some Cubemx configuration:-System Core >> High speed Clock >> Crystal Resonsator-TIM1 >> Clock source >> Channel 1 >> PWM Generation CH1-Counter setting >> Parameter setting >> Prescaler=1, Period=5000-Trigger Output(TRGO) Parameters >> Trigger Event Selection TRGO >> update Event-PWM Generation Channel 1 >> Mode>> PWM mode 1, pulse>> 2000-DMA>> TIM1_UP>> DMA2 Stream 5>> memory to peripheral >> Priority>> High>> Mode >> normal increment>> memoryto be honest i do not understand why should i do the following step: PWM Generation Channel 1 >> Mode>> PWM mode 1, pulse>> 2000. because i have defined the (TIM1_ARR, TIM1_RCR, TIM1_CCR1) in the buffer.but i tried to configure this as in this link >>https://www.st.com/content/ccc/resource/technical/document/application_note/group0/91/01/84/3f/7c/67/41/3f/DM00236305/files/DM00236305.pdf/jcr:content/translations/en.DM00236305.pdfcapital 5 Arbitrary waveform generation using timer DMAburst feature and because i am using Cubemx and HAL-Functions i do not really know how to programm with STM32 standard library. and in the main.c i can not see the DMA-configuration.i just see:static void MX_DMA_Init(void){/* DMA controller clock enable */__HAL_RCC_DMA2_CLK_ENABLE();/* DMA interrupt init *//* DMA2_Stream5_IRQn interrupt configuration */HAL_NVIC_SetPriority(DMA2_Stream5_IRQn, 0, 0);HAL_NVIC_EnableIRQ(DMA2_Stream5_IRQn);}could someone please help. i am trying since 4 days but without sucsesss.thanks in advance.this is the code:/* USER CODE BEGIN Header *//********************************************************************************* @file : main.c* @brief : Main program body******************************************************************************* @attention** <h2><center>&copy; Copyright (c) 2019 STMicroelectronics.* All rights reserved.</center></h2>** This software component is licensed by ST under BSD 3-Clause license,* the "License"; You may not use this file except in compliance with the* License. You may obtain a copy of the License at:* opensource.org/licenses/BSD-3-Clause********************************************************************************//* USER CODE END Header *//* Includes ------------------------------------------------------------------*/#include "main.h"/* Private includes ----------------------------------------------------------*//* USER CODE BEGIN Includes *//* USER CODE END Includes *//* Private typedef -----------------------------------------------------------*//* USER CODE BEGIN PTD *//* USER CODE END PTD *//* Private define ------------------------------------------------------------*//* USER CODE BEGIN PD *//* USER CODE END PD *//* Private macro -------------------------------------------------------------*//* USER CODE BEGIN PM *//* USER CODE END PM *//* Private variables ---------------------------------------------------------*/TIM_HandleTypeDef htim1;DMA_HandleTypeDef hdma_tim1_up;/* USER CODE BEGIN PV */uint32_t aSRC_Buffer = { 2000,3,800}; //ARR, Häufigkeit, CCR/* USER CODE END PV *//* Private function prototypes -----------------------------------------------*/void SystemClock_Config(void);static void MX_GPIO_Init(void);static void MX_DMA_Init(void);static void MX_TIM1_Init(void);static void MX_GFXSIMULATOR_Init(void);/* USER CODE BEGIN PFP *//* USER CODE END PFP *//* Private user code ---------------------------------------------------------*//* USER CODE BEGIN 0 *//* USER CODE END 0 *//*** @brief The application entry point.* @retval int*/int main(void){/* USER CODE BEGIN 1 *//* USER CODE END 1 *//* MCU Configuration--------------------------------------------------------*//* Reset of all peripherals, Initializes the Flash interface and the Systick. */HAL_Init();/* USER CODE BEGIN Init *//* USER CODE END Init *//* Configure the system clock */SystemClock_Config();/* USER CODE BEGIN SysInit *//* USER CODE END SysInit *//* Initialize all configured peripherals */MX_GPIO_Init();MX_DMA_Init();MX_TIM1_Init();MX_GFXSIMULATOR_Init();/* USER CODE BEGIN 2 */HAL_TIM_Base_Start(&htim1);HAL_TIM_PWM_Start(&htim1,TIM_CHANNEL_1);HAL_TIM_DMABurst_WriteStart(&htim1,TIM_DMABASE_ARR,TIM_DMA_UPDATE,(uint32_t *)aSRC_Buffer, TIM_DMABURSTLENGTH_3TRANSFERS);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */}/*** @brief System Clock Configuration* @retval None*/void SystemClock_Config(void){RCC_OscInitTypeDef RCC_OscInitStruct = {0};RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};/** Configure the main internal regulator output voltage*/__HAL_RCC_PWR_CLK_ENABLE();__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);/** Initializes the CPU, AHB and APB busses clocks*/RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;RCC_OscInitStruct.HSIState = RCC_HSI_ON;RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK){Error_Handler();}/** Initializes the CPU, AHB and APB busses clocks*/RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK){Error_Handler();}}/*** @brief GFXSIMULATOR Initialization Function* @param None* @retval None*/static void MX_GFXSIMULATOR_Init(void){/* USER CODE BEGIN GFXSIMULATOR_Init 0 *//* USER CODE END GFXSIMULATOR_Init 0 *//* USER CODE BEGIN GFXSIMULATOR_Init 1 *//* USER CODE END GFXSIMULATOR_Init 1 *//* USER CODE BEGIN GFXSIMULATOR_Init 2 *//* USER CODE END GFXSIMULATOR_Init 2 */}/*** @brief TIM1 Initialization Function* @param None* @retval None*/static void MX_TIM1_Init(void){/* USER CODE BEGIN TIM1_Init 0 *//* USER CODE END TIM1_Init 0 */TIM_ClockConfigTypeDef sClockSourceConfig = {0};TIM_MasterConfigTypeDef sMasterConfig = {0};TIM_OC_InitTypeDef sConfigOC = {0};TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig = {0};/* USER CODE BEGIN TIM1_Init 1 *//* USER CODE END TIM1_Init 1 */htim1.Instance = TIM1;htim1.Init.Prescaler = 1;htim1.Init.CounterMode = TIM_COUNTERMODE_UP;htim1.Init.Period = 5000;htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;htim1.Init.RepetitionCounter = 0;htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;if (HAL_TIM_Base_Init(&htim1) != HAL_OK){Error_Handler();}sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK){Error_Handler();}if (HAL_TIM_PWM_Init(&htim1) != HAL_OK){Error_Handler();}sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;sMasterConfig.MasterOutputTrigger2 = TIM_TRGO2_RESET;sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK){Error_Handler();}sConfigOC.OCMode = TIM_OCMODE_PWM1;sConfigOC.Pulse = 356;sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;if (HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1) != HAL_OK){Error_Handler();}sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_DISABLE;sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_DISABLE;sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF;sBreakDeadTimeConfig.DeadTime = 0;sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE;sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH;sBreakDeadTimeConfig.BreakFilter = 0;sBreakDeadTimeConfig.Break2State = TIM_BREAK2_DISABLE;sBreakDeadTimeConfig.Break2Polarity = TIM_BREAK2POLARITY_HIGH;sBreakDeadTimeConfig.Break2Filter = 0;sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;if (HAL_TIMEx_ConfigBreakDeadTime(&htim1, &sBreakDeadTimeConfig) != HAL_OK){Error_Handler();}/* USER CODE BEGIN TIM1_Init 2 *//* USER CODE END TIM1_Init 2 */}/*** Enable DMA controller clock*/static void MX_DMA_Init(void){/* DMA controller clock enable */__HAL_RCC_DMA2_CLK_ENABLE();/* DMA interrupt init *//* DMA2_Stream5_IRQn interrupt configuration */HAL_NVIC_SetPriority(DMA2_Stream5_IRQn, 0, 0);HAL_NVIC_EnableIRQ(DMA2_Stream5_IRQn);}/*** @brief GPIO Initialization Function* @param None* @retval None*/static void MX_GPIO_Init(void){/* GPIO Ports Clock Enable */__HAL_RCC_GPIOH_CLK_ENABLE();}/* USER CODE BEGIN 4 *//* USER CODE END 4 *//*** @brief This function is executed in case of error occurrence.* @retval None*/void Error_Handler(void){/* USER CODE BEGIN Error_Handler_Debug *//* User can add his own implementation to report the HAL error return state *//* USER CODE END Error_Handler_Debug */}#ifdef USE_FULL_ASSERT/*** @brief Reports the name of the source file and the source line number* where the assert_param error has occurred.* @param file: pointer to the source file name* @param line: assert_param error line source number* @retval None*/void assert_failed(uint8_t *file, uint32_t line){/* USER CODE BEGIN 6 *//* User can add his own implementation to report the file name and line number,tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) *//* USER CODE END 6 */}#endif /* USE_FULL_ASSERT *//************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

author: MosherIV
author_rank: Super Contributor
timestamp: March 27, 2019, 02:56:37 pm
content: Hi MarkWelcome to the forum.You are correct in that you do not need to enable or use the PWM peripheral (technically I think it is the timer peripheral in PWM mode).You need to enable the DAC peripheral if the microcontroller has one.Then you configure the io pin to alternal function DAC output.DMA needs to be routed to the DAC peripheral.The DAC peripheral needs to be configured to output from the DMA buffer.I havd never done this before, just read about it in the DMA section and DAC section of the user guide.The user guides tell you how to use each peripheral at register level ie understand how the device does things.The user guide is NOT a API guide to the cube library - sorry you just have to rely on understanding the device peripherals and then hope the comments in the Cube library are self explanitory.