Why I change the lpuart priority cause lpuart send failed?S32K148

[Licunhao]

Please help to review the follow code;

When I open the comment for change the uart priority to 2, uart can not send data.

void uart_init(void) {

uint8_t uart_proi = 0;

UART_Init(&uart_pal1_instance, &uart_pal1_Config0);

INT_SYS_DisableIRQ(LPUART1_RxTx_IRQn);

uart_proi = INT_SYS_GetPriority(LPUART1_RxTx_IRQn);

// INT_SYS_SetPriority(LPUART1_RxTx_IRQn, 2);

uart_proi = INT_SYS_GetPriority(LPUART1_RxTx_IRQn);

INT_SYS_EnableIRQ(LPUART1_RxTx_IRQn);

GE_LOGI(LOG_TAG "uart_proi = %d", __func__, uart_proi);

// start uart rx

UART_ReceiveData(&uart_pal1_instance, uart_rx_buf, 1);

}

void uart_send_data(uint8_t *data, uint32_t size) {

uint32_t bytesRemaining;

UART_SendData(&uart_pal1_instance, data, size);

// blocking here if change priority

while (UART_GetTransmitStatus(&uart_pal1_instance, &bytesRemaining) != STATUS_SUCCESS)  {

}

}

[Licunhao · Accepted solution]

I solved this problem.

Just must change priority after vTaskStartScheduler.

I think it root case is osif_freertos.c should work after TaskStartScheduler.,

Close

[danielmartynek]

Hi @Licunhao,

I think it is well explained here:

https://www.freertos.org/Documentation/02-Kernel/03-Supported-devices/04-Demos/ARM-Cortex/RTOS-Corte...

Regards,

Daniel

[Licunhao]

And I also use FreeRTOS.

[Licunhao]

without FreeRTOS.IT works well.
with FreeRTOS.IT works fail. Why?