Question
Problem with spi full duplex
in my application I use stm32F407G-DISC1 as a slave. I want to use the board the spi slave full duplexes. the problem is on the first Receive I get all the data from the master then I send data and works but the second time I only get zeros even though I send data from the master.
int main(void)
{
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();
MX_DMA_Init();
MX_USART2_UART_Init();
MX_TIM14_Init();
MX_SPI1_Init();
MX_TIM13_Init();
MX_SPI2_Init();
MX_SPI3_Init();
/* USER CODE BEGIN 2 */
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
uart_buf_len = sprintf(uart_buf, "RECEIVE-CMD STATE \r\n");
HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, uart_buf_len, 100);
cmd_received();
HAL_Delay(2000);
TX_DATA(help_voltage,help_speed,help_pressure,help_current,help_torc);
HAL_Delay(1000);
}
static CMD_RECIEVED_t cmd_received(void)
{
Flush_Buffer(ARR_PARAMS,BUFFERSIZE);
uart_buf_len = sprintf(uart_buf, "CMD_RECEIVE \r\n");
HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, uart_buf_len, 100);
if (HAL_SPI_GetState(&hspi1) == HAL_SPI_STATE_READY )
{
switch (HAL_SPI_Receive(&hspi1,(uint8_t*)ARR_PARAMS, BUFFERSIZE,HAL_MAX_DELAY))
{
case HAL_OK:
{
for (int i = 0 ; i < BUFFERSIZE ; i++)
{
uart_buf_len = sprintf(uart_buf, "Recieved Params = %f \r\n",ARR_PARAMS[i]);
HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, uart_buf_len, 100);
}
}
break;
case HAL_ERROR:
Error_Handler();
break;
case HAL_BUSY:
uart_buf_len = sprintf(uart_buf, "SPI Bus Busy \r\n");
HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, uart_buf_len, 100);
break;
case HAL_TIMEOUT:
uart_buf_len = sprintf(uart_buf, "SPI Timing Error \r\n");
HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, uart_buf_len, 100);
break;
default :
Error_Handler();
}
}
else {
uart_buf_len = sprintf(uart_buf, "SPI_state = %d \r\n",HAL_SPI_GetState(&hspi1));
HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, uart_buf_len, 100);
HAL_Delay(2000);
}
}
static void TX_DATA(float volt,float spee , float press ,float curre, float tor)
{
Control_Values[0] = volt;
Control_Values[1] = spee;
Control_Values[2] = press;
Control_Values[3] = curre;
Control_Values[4] = torc;
if (HAL_SPI_GetState(&hspi1) == HAL_SPI_STATE_READY )
{
switch (HAL_SPI_Transmit(&hspi1, (uint8_t*) Control_Values, BUFFERSIZE, HAL_MAX_DELAY))
{
case HAL_OK:
for (int i = 0 ; i<BUFFERSIZE ; i++)
{
uart_buf_len = sprintf(uart_buf, "SEND Params = %f \r\n",Control_Values[i]);
HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, uart_buf_len, 100);
}
break;
case HAL_ERROR:
Error_Handler();
uart_buf_len = sprintf(uart_buf, "Error \r\n");
HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, uart_buf_len, 100);
break;
case HAL_BUSY:
uart_buf_len = sprintf(uart_buf, "SPI Bus Busy \r\n");
HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, uart_buf_len, 100);
break;
case HAL_TIMEOUT:
uart_buf_len = sprintf(uart_buf, "SPI Timing Error \r\n");
HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, uart_buf_len, 100);
break;
default :
Error_Handler();
}
}
else {
uart_buf_len = sprintf(uart_buf, "Recieved Params = %d \r\n",HAL_SPI_GetState(&hspi1));
HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, uart_buf_len, 100);
}
}
Output to Serial Monitor
