I tested it
1. uart dma and ring buffer
2. Use HAL_UART_Receive_IT
to be.
Among them, I used HAL_UART_Receive_IT because the length of input data is fixed.
I'm not sure my code is correct ... but I release my code.
My board is stm32f746-disco
HAL_UART_Receive_IT (); function must be called to re-enable the interrupt.
Adding a ring buffer here will give you more flexibility.
uint8_t RecvOn;
uint8_t Usart1RxBuf[8];
int main(void)
{
HAL_Init();
__HAL_RCC_CRC_CLK_ENABLE();
SystemClock_Config();
MX_MPU_Init();
MX_Common_Function_Init();
xTaskCreate(MODtask, "MODtask", 512 , NULL , 2, NULL);
.
.
.
vTaskStartScheduler();
while(1);
}
void MX_USART1_UART_Init (void)
{
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init (& huart1)! = HAL_OK)
{
Error_Handler ();
}
}
void HAL_UART_MspInit (UART_HandleTypeDef * huart)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if (huart-> Instance == USART1)
{
__HAL_RCC_USART1_CLK_ENABLE ();
__HAL_RCC_GPIOB_CLK_ENABLE ();
__HAL_RCC_GPIOA_CLK_ENABLE ();
GPIO_InitStruct.Pin = GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
HAL_GPIO_Init (GPIOB, & GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
HAL_GPIO_Init (GPIOA, & GPIO_InitStruct);
HAL_NVIC_SetPriority (USART1_IRQn, 7, 0);
HAL_NVIC_EnableIRQ (USART1_IRQn);
}
}
----------------------------------------------USART1_IRQHandler
void USART1_IRQHandler (void)
{
HAL_UART_IRQHandler (& huart1);
}
----------------------------------------------USART1_IRQHandler
----------------------------------------------freertos task
void MODtask(void* params)
{
RecvOn=0;
HAL_UART_Receive_IT(&huart1, Usart1RxBuf, 8);
while(1)
{
if(RecvOn==1)
{
CRC16_rtu_check(Usart1RxBuf, u1_mb.data_size);
.
.
.
.
.
HAL_UART_Transmit(&huart1, u1_mb.u1_tx, u1_mb.frame_size, 20);
RecvOn=0;
HAL_UART_Receive_IT(&huart1, Usart1RxBuf, 8);
}
vTaskDelay(20);
}
----------------------------------------------freertos task
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
if(huart->Instance == USART1)
{
RecvOn = 1;
}
}
