PIC18F26K22 No SPI Signal  - Page 1
Forum section: electronics / general

author: BurnedResistor
author_rank: Regular Contributor
timestamp: February 16, 2016, 03:27:48 pm
content: Dear All,I feel slightly embarrassed having to ask for help on another serial bus, but I have been trouble shooting this for hours to no yield. With your help I was able to establish communication between a 32mx and the nrf24 wireless module.Now I am in the process of setting up the other transmitter which will consist of a pic18f26k22, mostly because I only have one pic32mx, the the 18f was laying around.My issue is that I am not able to get the MSSP module to output data onto the pins. My function where I put the data into the buffer,poll the interrupt bit, and then read the buffer exits normally, but the data lines (as checke with my oscilloscope) stay low~!I have simplified my code down to simply trying to spit out sequential numbers from the SPI, but my oscilloscope does not show anything on the lines, and the SSPBUF reads back empty, indicating that also no data was received.Here is the code:Code:/** File: newmain.c* Author: Philipp** Created on February 16, 2016, 4:34 PM*/#include <stdio.h>#include <stdlib.h>#include <xc.h>// CONFIG1H#pragma config FOSC = INTIO67 // Oscillator Selection bits (Internal oscillator block)#pragma config PLLCFG = ON // 4X PLL Enable (Oscillator multiplied by 4)#pragma config PRICLKEN = ON // Primary clock enable bit (Primary clock enabled)#pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)#pragma config IESO = OFF // Internal/External Oscillator Switchover bit (Oscillator Switchover mode disabled)// CONFIG2L#pragma config PWRTEN = OFF // Power-up Timer Enable bit (Power up timer disabled)#pragma config BOREN = SBORDIS // Brown-out Reset Enable bits (Brown-out Reset enabled in hardware only (SBOREN is disabled))#pragma config BORV = 190 // Brown Out Reset Voltage bits (VBOR set to 1.90 V nominal)// CONFIG2H#pragma config WDTEN = NOSLP // Watchdog Timer Enable bits (WDT is disabled in sleep, otherwise enabled. SWDTEN bit has no effect)#pragma config WDTPS = 32768 // Watchdog Timer Postscale Select bits (1:32768)// CONFIG3H#pragma config CCP2MX = PORTC1 // CCP2 MUX bit (CCP2 input/output is multiplexed with RC1)#pragma config PBADEN = ON // PORTB A/D Enable bit (PORTB<5:0> pins are configured as analog input channels on Reset)#pragma config CCP3MX = PORTB5 // P3A/CCP3 Mux bit (P3A/CCP3 input/output is multiplexed with RB5)#pragma config HFOFST = ON // HFINTOSC Fast Start-up (HFINTOSC output and ready status are not delayed by the oscillator stable status)#pragma config T3CMX = PORTC0 // Timer3 Clock input mux bit (T3CKI is on RC0)#pragma config P2BMX = PORTB5 // ECCP2 B output mux bit (P2B is on RB5)#pragma config MCLRE = EXTMCLR // MCLR Pin Enable bit (MCLR pin enabled, RE3 input pin disabled)// CONFIG4L#pragma config STVREN = ON // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)#pragma config LVP = ON // Single-Supply ICSP Enable bit (Single-Supply ICSP enabled if MCLRE is also 1)#pragma config XINST = OFF // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled (Legacy mode))// CONFIG5L#pragma config CP0 = OFF // Code Protection Block 0 (Block 0 (000800-003FFFh) not code-protected)#pragma config CP1 = OFF // Code Protection Block 1 (Block 1 (004000-007FFFh) not code-protected)#pragma config CP2 = OFF // Code Protection Block 2 (Block 2 (008000-00BFFFh) not code-protected)#pragma config CP3 = OFF // Code Protection Block 3 (Block 3 (00C000-00FFFFh) not code-protected)// CONFIG5H#pragma config CPB = OFF // Boot Block Code Protection bit (Boot block (000000-0007FFh) not code-protected)#pragma config CPD = OFF // Data EEPROM Code Protection bit (Data EEPROM not code-protected)// CONFIG6L#pragma config WRT0 = OFF // Write Protection Block 0 (Block 0 (000800-003FFFh) not write-protected)#pragma config WRT1 = OFF // Write Protection Block 1 (Block 1 (004000-007FFFh) not write-protected)#pragma config WRT2 = OFF // Write Protection Block 2 (Block 2 (008000-00BFFFh) not write-protected)#pragma config WRT3 = OFF // Write Protection Block 3 (Block 3 (00C000-00FFFFh) not write-protected)// CONFIG6H#pragma config WRTC = OFF // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) not write-protected)#pragma config WRTB = OFF // Boot Block Write Protection bit (Boot Block (000000-0007FFh) not write-protected)#pragma config WRTD = OFF // Data EEPROM Write Protection bit (Data EEPROM not write-protected)// CONFIG7L#pragma config EBTR0 = OFF // Table Read Protection Block 0 (Block 0 (000800-003FFFh) not protected from table reads executed in other blocks)#pragma config EBTR1 = OFF // Table Read Protection Block 1 (Block 1 (004000-007FFFh) not protected from table reads executed in other blocks)#pragma config EBTR2 = OFF // Table Read Protection Block 2 (Block 2 (008000-00BFFFh) not protected from table reads executed in other blocks)#pragma config EBTR3 = OFF // Table Read Protection Block 3 (Block 3 (00C000-00FFFFh) not protected from table reads executed in other blocks)// CONFIG7H#pragma config EBTRB = OFF // Boot Block Table Read Protection bit (Boot Block (000000-0007FFh) not protected from table reads executed in other blocks)/***/int main(int argc, char** argv) {//NRF://MOSITRISBbits.RB1 = 0;//MISOTRISBbits.RB2 = 1;//SCKTRISBbits.RB3 = 0;//CETRISCbits.RC5 = 0;//CSNTRISCbits.RC7 = 0;//IRQTRISCbits.RC6 = 1;SSP1CON1bits.SSPEN = 1;SSP1CON1bits.SSPM = 0b0010;SSP1STAT = 0;SSP1STATbits.CKE = 1;SSP1CON1bits.CKP = 1;char n = 0;while (1) {PIR1bits.SSP1IF = 0;if (SSP1STATbits.BF) {int temp = SSP1BUF;}SSP1BUF = n;while (SSP1STATbits.BF ==0) {;}n = SSP1BUF;PIR1bits.SSP1IF = 0;}}

author: AndyC_772
author_rank: Super Contributor
timestamp: February 16, 2016, 04:00:02 pm
content: I think you're on the wrong pins.You're using SSP1, for which the clock and data pins are RC3, RC4 and RC5.The pins you're assigning - and, I presume, probing - are those associated with SSP2.

author: BurnedResistor
author_rank: Regular Contributor
timestamp: February 16, 2016, 04:38:29 pm
content: Quote from: AndyC_772 on February 16, 2016, 04:00:02 pmYOU ARE A SAVIOURI have been looking at the same code for 3 hours now! That's what happens when I am stressed...Anyhow, THANK YOU SO MUCH!

author: AndyC_772
author_rank: Super Contributor
timestamp: February 16, 2016, 05:44:56 pm
content: Quote from: BurnedResistor on February 16, 2016, 04:38:29 pmNope, professional engineer. We've all made exactly the same mistake at least once!