Question
stm32f103c8t6 spi communication with Arduino
Posted on April 15, 2017 at 11:42
Hello
I devolved a code for stm32 as a master and for arduino as a slave , to send a byte through SPI.
But it did not work. I want to know what is the wrong in my code.
STM32 Master Code :
static void SPI_Config(void);
int main()
{ SPI_Config(); for (int z=0 ; z<50 ; z++){ SPI_I2S_SendData(SPI1,'A');} return 0;}static void SPI_Config(void)
{GPIO_InitTypeDef GPIO_InitStructure;SPI_InitTypeDef SPI_InitStructure;// Configure SPI1_CLKa and SPI1_MOSI GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7; GPIO_Init(GPIOA, &GPIO_InitStructure); // SPI1 no remap (NSS/PA4, SCK/PA5, MISO/PA6, MOSI/PA7) GPIO_PinRemapConfig(GPIO_Remap_SPI1, DISABLE); // Spi init/* SPI configuration *****************************************/SPI_InitStructure.SPI_Direction =SPI_Direction_2Lines_FullDuplex;SPI_InitStructure.SPI_Mode = SPI_Mode_Master;SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;SPI_InitStructure.SPI_BaudRatePrescaler =SPI_BaudRatePrescaler_64;SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;SPI_InitStructure.SPI_CRCPolynomial = 0;SPI_Init(SPI1, &SPI_InitStructure);SPI_Cmd(SPI1, ENABLE);}Arduino Slave code:
#include <SPI.h>
char buff [50];volatile byte indx;volatile boolean process;void setup (void) {
Serial.begin (115200); pinMode(MISO, OUTPUT); // have to send on master in so it set as output SPCR |= _BV(SPE); // turn on SPI in slave mode indx = 0; // buffer empty process = false; SPI.attachInterrupt(); // turn on interrupt}ISR (SPI_STC_vect) // SPI interrupt routine { byte c = SPDR; // read byte from SPI Data Register if (indx < sizeof buff) { buff [indx++] = c; // save data in the next index in the array buff if (c == '\r') //check for the end of the word process = true; }}void loop (void) {
if (process) { process = false; //reset the process Serial.println (buff); //print the array on serial monitor indx= 0; //reset button to zero }}