Posted on July 05, 2018 at 20:00
I'm trying to initialize SPI on STM32F746ZG-nucleo and send some data.
When i check with oscilloscope it shows an extra 0x00 packet at the end of each transmission.
I can't figure out why, please help.
#include ''stm32f7xx.h''
void SPI2_tx(uint8_t data){
SPI2->DR = data; while(!(SPI2->SR & 2));}uint8_t SPI2_rx(void){
while(!(SPI2->SR & 1)); return(SPI2->DR);}int main(void){
uint8_t asd; RCC->AHB1ENR |= (1<<2)|(1<<3); //c,d RCC->APB1ENR |= (1<<14); //spi2 GPIOC->MODER |= (2<<4)|(2<<6)|1; // 0,2,3 GPIOC->OSPEEDR |= 3|(3<<4)|(3<<6); GPIOC->AFR[0] |= (5<<8)|(5<<12); GPIOD->MODER |= (2<<6); // 3 GPIOD->OSPEEDR |= (3<<6); GPIOD->AFR[0] |= (5<<12); GPIOC->ODR |= 1; //spics SPI2->CR2 = 0x1704; SPI2->CR1 = 0x0354;SPI2_tx(0x0D);
SPI2_tx(0xFF); asd=SPI2->DR;while(1);}
