Posted on November 22, 2015 at 17:33hi there!
writing fine to SPI slave, however, when trying to read, writing stops working:
for(;;){
for (i=0; i<=128; i++){
Pot0Write(i);
Pot1Write(i);
// res0=Pot0Read();
// res1=Pot1Read();
printf(''%5d: POT0 %d\t POT1 %d\n\r'',i,res0,res1);
osDelay(10);
}
void Pot0Write(int data){
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_1, GPIO_PIN_RESET); //set CS line active low
HAL_SPI_Transmit(&hspi2,(uint8_t *)&pot0Write,1, 0);
HAL_SPI_Transmit(&hspi2,(uint8_t *)&data,1, 0);
// HAL_SPI_TransmitReceive(&hspi2,(uint8_t *)&pot0Write , &RxData, 1,0);
// HAL_SPI_TransmitReceive(&hspi2,(uint8_t *)&data , &RxData, 1,0);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_1, GPIO_PIN_SET); //reset CS line active high
}
/**
* @brief writes to MCP4231 first sends a address/command, then data
* @param None
* @retval None
*/
void Pot1Write(int data){
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_1, GPIO_PIN_RESET); //set CS line active low
HAL_SPI_Transmit(&hspi2,(uint8_t *)&pot1Write,1, 0);
HAL_SPI_Transmit(&hspi2,(uint8_t *)&data,1, 0);
// HAL_SPI_TransmitReceive(&hspi2,(uint8_t *)&pot0Write , &RxData, 1,0);
// HAL_SPI_TransmitReceive(&hspi2,(uint8_t *)&data , &RxData, 1,0);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_1, GPIO_PIN_SET); //reset CS line active high
}
/**
* @brief writes to MCP4231 first sends a address/command, then reads the data
* @param None
* @retval None
*/
uint8_t Pot0Read(void){
uint8_t RxData;
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_1, GPIO_PIN_RESET); //set CS line active low
HAL_SPI_Transmit(&hspi2,(uint8_t *)&pot0Read,1, 0);
HAL_SPI_Receive(&hspi2,&RxData, 1, 5000);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_1, GPIO_PIN_SET); //reset CS line active high
return RxData;
}
/**
* @brief writes to MCP4231 first sends a address/command, then reads the data
* @param None
* @retval None
*/
uint8_t Pot1Read(void){
uint8_t RxData;
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_1, GPIO_PIN_RESET); //set CS line active low
HAL_SPI_Transmit(&hspi2,(uint8_t *)&pot1Read,1, 0);
HAL_SPI_Receive(&hspi2,&RxData, 1, 5000);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_1, GPIO_PIN_SET); //reset CS line active high
return RxData;
}
