HAL_NVIC_EnableIRQ does not end

[yonggeon]

    // DMA RX 설정

    __HAL_RCC_DMA1_CLK_ENABLE();  // DMA1 클럭 활성화

    hdma_rx.Instance = DMA_USART1;

    hdma_rx.Init.Request = DMA_REQUEST_USART1_RX;

    hdma_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;

    hdma_rx.Init.PeriphInc = DMA_PINC_DISABLE;

    hdma_rx.Init.MemInc = DMA_MINC_ENABLE;

    hdma_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;

    hdma_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

    hdma_rx.Init.Mode = DMA_CIRCULAR;  // 순환 모드

    hdma_rx.Init.Priority = DMA_PRIORITY_LOW;

    if (HAL_DMA_Init(&hdma_rx) != HAL_OK) { return IMU_INIT_FAILED; }

    __HAL_LINKDMA(&huart, hdmarx, hdma_rx);

    if (HAL_UART_Receive_DMA(&huart, &q_buf[0], DMA_BUFFER_IMU) != HAL_OK) {  return IMU_INIT_FAILED; }

    Delay_ms(1);

    __HAL_UART_CLEAR_FLAG(&huart, UART_FLAG_IDLE);

    HAL_NVIC_SetPriority(UART_IMU_IRQ, IT_PRIOR_IMU_PREM, IT_PRIOR_IMU_SUB);  // Set priority

    HAL_NVIC_EnableIRQ(UART_IMU_IRQ);          // Enable IRQ

    __HAL_UART_ENABLE_IT(&huart, UART_IT_IDLE);

    __HAL_UART_CLEAR_FLAG(&huart, UART_FLAG_IDLE);

    return IMU_INIT_SUCCESS;

}

literally, HAL_NVIC_EnableIRQ does not end...

the parameters in code is as follows:

DMA_BUFFER_IMU : 128

UART_IMU_IRQ : USART1_IRQn

IT_PRIOR_IMU_PREM : 1

IT_PRIOR_IMU_SUB : 1

[gbm]

HAL_UART_Receive_DMA is asynchronous and uses UART and DMA interrupts. Fiddling with interrupts manually while the HAL state machine is using them will usually lead to disaster. Don't play with UART until the RxComplete is called. Do not change interrupt priorities while the interrupt may be in use.

[yonggeon]

actually, this code is one of the part which initiate uart. such as..

void begin(){

    ~~
    ~~

    if (HAL_DMA_Init(&hdma_rx) != HAL_OK) { return IMU_INIT_FAILED; }

    __HAL_LINKDMA(&huart, hdmarx, hdma_rx);

    if (HAL_UART_Receive_DMA(&huart, &q_buf[0], DMA_BUFFER_IMU) != HAL_OK) {  return IMU_INIT_FAILED; }

    Delay_ms(1);

    __HAL_UART_CLEAR_FLAG(&huart, UART_FLAG_IDLE);

    HAL_NVIC_SetPriority(UART_IMU_IRQ, IT_PRIOR_IMU_PREM, IT_PRIOR_IMU_SUB);  // Set priority

    HAL_NVIC_EnableIRQ(UART_IMU_IRQ);          // Enable IRQ

    __HAL_UART_ENABLE_IT(&huart, UART_IT_IDLE);

    __HAL_UART_CLEAR_FLAG(&huart, UART_FLAG_IDLE);

    return IMU_INIT_SUCCESS;

}

so i changed order of HAL_UART_Receive_DMA and NVIC & UART IT/flag lines then HAL_UART_Receive_DMA does not end at this time...

[Tesla DeLorean]

The MCU will tail-chain IRQ's continuously if the source of the interrupt is not cleared, or keeps asserting more rapidly that the handlers can clear them.

It will only return to foreground execution once everything is clear.