Hi Guys, I am new to embedded programming. I am currently trying to transmit data between 2 Nucleo boards via SPI in interrupt Mode. The problem is I am getting gibberish data in my master mode Nucleo board and transmission stops in slave mode with an error. I am trying to experiment that from 2 Nucleo boards one shall be master and the other slave. I send a float value from master to slave in SPI, where it's multiplied by 2 and is sent back to master from slave via SPI.
Below is SPI initialization for the slave board
static void MX_SPI1_Init(void)
{
hspi1.Instance = SPI1;
hspi1.Init.Mode = SPI_MODE_SLAVE;
hspi1.Init.Direction = SPI_DIRECTION_2LINES;
hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi1.Init.NSS = SPI_NSS_HARD_INPUT;
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi1.Init.CRCPolynomial = 7;
hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
hspi1.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
if (HAL_SPI_Init(&hspi1) != HAL_OK)
{
Error_Handler();}
}
The main program in slave board:
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
//MX_ETH_Init();
MX_USART3_UART_Init();
MX_USB_OTG_FS_PCD_Init();
MX_SPI1_Init();
char msg[50];
while(!HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_13));
sprintf(msg,"Starting SPI Slave \r\n");
HAL_UART_Transmit(&huart3,(uint8_t*)msg,strlen(msg),HAL_MAX_DELAY);
int input, output = 0;
while (1)
{
if(HAL_SPI_Receive_IT(&hspi1, (uint8_t *)&result,sizeof(result))!= HAL_OK)
{ sprintf(msg,"Slave exchange failed \r\n");
HAL_UART_Transmit(&huart3,(uint8_t*)msg,strlen(msg),HAL_MAX_DELAY);
Error_Handler();
}
else
{
HAL_SPI_Transmit_IT(&hspi1, (uint8_t *)&input,sizeof(input));
}
HAL_Delay(10);
}
}
SPI Initialisation for the master board:
static void MX_SPI1_Init(void)
{
hspi1.Instance = SPI1;
hspi1.Init.Mode = SPI_MODE_MASTER;
hspi1.Init.Direction = SPI_DIRECTION_2LINES;
hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi1.Init.NSS = SPI_NSS_HARD_OUTPUT;
hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_64;
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi1.Init.CRCPolynomial = 7;
hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
hspi1.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
if (HAL_SPI_Init(&hspi1) != HAL_OK)
{
Error_Handler();
}
}
The main program for the master board:
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
//MX_ETH_Init();
MX_USART3_UART_Init();
MX_USB_OTG_FS_PCD_Init();
MX_SPI1_Init();
char msg[50];
while(!HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_13));
sprintf(msg,"Starting SPI Demo \r\n");
HAL_UART_Transmit(&huart3,(uint8_t*)msg,strlen(msg),HAL_MAX_DELAY);
while (1)
{ HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET);
if(HAL_SPI_Transmit_IT(&hspi1, (uint8_t *)&input,sizeof(input))!= HAL_OK)
{ sprintf(msg,"Master exchange failed \r\n");
HAL_UART_Transmit(&huart3,(uint8_t*)msg,strlen(msg),HAL_MAX_DELAY);
Error_Handler();
}
else
{
HAL_SPI_Receive_IT(&hspi1, (uint8_t *)&result,sizeof(result));
}
HAL_Delay(10);
}
}
I have been stuck with this issue for 3 days now. I really need help in solving this issue.
