Hello i am using 2 STM32F302R8 nucleo boards as 1 slave and 1 master.
Master sends values to slave but slave is not receiving values and not going to interrupt.
Master Code:
uint8_t x;
uint16_t d;
void rx(void){
GPIOB->ODR&=~(1<<9);// reset PB9
SPI2->CR1|=(1<<6);//start spi2
while(!(SPI2->SR&(1<<1))){}//wait for tx buffer empty
SPI2->DR=x;
d=SPI2->SR;
while(!(SPI2->SR&(1<<1))){}//wait for tx buffer enmpty
GPIOB->ODR|=(1<<9);//set PB9
SPI2->CR1&=~(1<<6);//stop spi2
x++;
}
/* 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();
/* USER CODE BEGIN 2 */
RCC->AHBENR|=(1<<18);//GPIOB clock
RCC->APB1ENR|=(1<<14);//SPI2 clock
GPIOB->MODER|=(2<<30)|(2<<28)|(2<<26)|(1<<18);//PB15 PB14 PB13 alternate function PB9 output
GPIOB->OSPEEDR|=(3<<30)|(3<<28)|(3<<26);//PB15 PB14 PB13 high speed
GPIOB->ODR|=(1<<9);//PB9 set
GPIOB->AFR[1]|=(5<<28)|(5<<24)|(5<<20);//AF5 PB15 PB14 PB13 PB12
//SPI2 CR1
SPI2->CR1|=(1<<5);//Fpclk/32 36/32
SPI2->CR1&=~((1<<1)|(1<<0));//cpol cpha 0 0
SPI2->CR1&=~((1<<15)|(1<<10));// 2 undirectional full duplex
SPI2->CR1&=~(1<<7);// msb first
SPI2->CR1|=(1<<9)|(1<<8);//master ssm=1 ssi=1 prevent modf error
SPI2->CR1|=(1<<2);//master mode
//SPI2 CR2
SPI2->CR2|=(1<<8)|(1<<9)|(1<<10);//8 bit data
SPI2->CR2|=(1<<2);//not working multimaster
SPI2->CR2&=(1<<4);//motorola spi2
SPI2->CR2|=(1<<12);//RXNE event when fifo 8 bit or greater
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
rx();
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
Slave Code:
uint8_t rxdata,x,z;
uint16_t d;
void SPI2_IRQHandler(void){
if(SPI2->SR&(1<<0)){
x++;
rxdata=SPI2->DR;
}
}
/* 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();
/* USER CODE BEGIN 2 */
RCC->AHBENR|=(1<<18);//GPIOB clock
RCC->APB1ENR|=(1<<14);//SPI2 clock
GPIOB->MODER|=(2<<30)|(2<<28)|(2<<26)|(2<<24);//PB15 PB14 PB13 PB12 alternate function
GPIOB->OSPEEDR|=(3<<30)|(3<<28)|(3<<26)|(3<<24);//PB15 PB14 PB13 PB12 high speed
GPIOB->AFR[1]|=(5<<28)|(5<<24)|(5<<20)|(5<<16);//AF5 PB15 PB14 PB13 PB12
NVIC_EnableIRQ(SPI2_IRQn);
//SPI2 CR1
SPI2->CR1&=~((1<<1)|(1<<0));//cpol cpha 0 0
SPI2->CR1&=~((1<<15)|(1<<10));// 2 undirexctional full duplex
SPI2->CR1&=~(1<<7);// msb first
SPI2->CR1&=~(1<<2);//slave
//SPI2 CR2
SPI2->CR2|=(1<<8)|(1<<9)|(1<<10);//8 bit data
SPI2->CR2&=(1<<4);//motorola spi2
SPI2->CR2|=(1<<12);//RXNE event when fifo 8 bit or greater
SPI2->CR2|=(1<<6);//RXNEIE
//ENABLE
SPI2->CR1|=(1<<6);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
d=SPI2->SR;
z++;
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
