Hi,

I have developed UART application for STM32f103 with freertos. I am facing problem with UART reception. UART receive interrupt works only for starting few ms. After that it stops. I think i am facing problem with priority but couldn't understand where and how?

Below are my firmware details .

below line is executed at the starting of the initialization. HALNVICSetPriorityGrouping(NVICPRIORITYGROUP4);

UART interrupt priorit is set at

HALNVICSetPriority(USART1IRQn, 3, 0); HALNVICEnableIRQ(USART1IRQn);

Thanks in advace for help.....

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Here and here you find recent threads about the same subject.

And as written everywhere: make sure that configASSERT will be called, and that configASSERT_DEFINED is defined as 1.

Have a look at ARM_CM4F/port.c around line 703:

~~~

void vPortValidateInterruptPriority( void )
{
...

~~~

A lot of text has been written about this subject, most importantly here

Regards.

Thanks Hein Tibosch -

i HAVE USE STM32CUBESUITE FOR CREATEING FREERTOS FILE As per my understanding assigning priorities are correct. Correct me if i am wrong.

~~~~

below line is executed at the starting of the initialization. HALNVICSetPriorityGrouping(NVICPRIORITYGROUP4); UART interrupt priorit is set at HALNVICSetPriority(USART1IRQn, 3, 0); HALNVICEnableIRQ(USART1IRQn); ~~~~

And as written everywhere: make sure that configASSERT will be called, and that configASSERT_DEFINED is defined as 1.

configASSERTDEFINED is defined as 1 and for configASSERT Correct me if my usage of configASSERT is wrong. /PRIORITY IS DEFINED AS osPriorityNormal/ code snippets ~~~~ void vMODBCommTask(void const * argument) { uint32t ulNotificationValue; /* USER CODE BEGIN vMODBCommTask / MODB_Initialization(); / Infinite loop */ for(;;) {

	MODB_MainTask();
	/* Wait for the transmission to complete. */
ulNotificationValue = ulTaskNotifyTake( pdFALSE, 1000 );

if( ulNotificationValue == 1 )
{
    /* The RECEPTION ended as expected. */
}
else
{
    /* The call to ulTaskNotifyTake() timed out. */
}

osDelay(2);/*2 ms*/

}

}

void MODB_MainTask(void) { configASSERT( xTaskToNotify == NULL );

/* Store the handle of the calling task. */ xTaskToNotify = xTaskGetCurrentTaskHandle();

{
	/* Check for Valid frame received and respond accordingly */
	if(MODB_ProcessReceivedFrame(MODB_COMM,&g_st_ModbusReceivedFrame,&g_st_ModbusTransmitFrame))
	{
		while(g_st_Modbus_Variables.ui32_ThreeAndHalfCharCount < 
						g_st_Modbus_Variables.ui32_ThreeAndHalfCharCompareCount)
		{
			osDelay(2);/*2ms*/
		}
		/* Send Response frame */
		MODB_TransmitResponseFrame(&g_stUART1_MODB,g_st_ModbusTransmitFrame.ui8_Data,g_st_ModbusTransmitFrame.ui8_DataLength);
	}
}

}

void MODBUARTRXCallback(UARTHandleTypeDef *huart) {

BaseType_t xHigherPriorityTaskWoken;
if(huart->Instance == MODB_UART)
{
	MODB_RTU_ReceiveFrame (g_st_Modbus_Variables.ui8_RecByte, &g_st_Modbus_Variables, &g_st_ModbusReceivedFrame);
	MODB_RTS_OFF
	HAL_UART_Receive_IT(huart, &g_st_Modbus_Variables.ui8_RecByte, MODB_UART_RX_NO_BYTE);
	if(g_st_ModbusReceivedFrame.ui8_IsValidFrameReceived)
	{
		xHigherPriorityTaskWoken = pdFALSE;
		 configASSERT( xTaskToNotify != NULL );
		vTaskNotifyGiveFromISR( MODBCommTaskHandle, &xHigherPriorityTaskWoken );
		xTaskToNotify = NULL;
		portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
	}
}

}

OS PRIORITY ARE DEFINED AS /// Priority used for thread control. /// note MUST REMAIN UNCHANGED: b osPriority shall be consistent in every CMSIS-RTOS. typedef enum { osPriorityIdle = -3, ///< priority: idle (lowest) osPriorityLow = -2, ///< priority: low osPriorityBelowNormal = -1, ///< priority: below normal osPriorityNormal = 0, ///< priority: normal (default) osPriorityAboveNormal = +1, ///< priority: above normal osPriorityHigh = +2, ///< priority: high osPriorityRealtime = +3, ///< priority: realtime (highest) osPriorityError = 0x84 ///< system cannot determine priority or thread has illegal priority } osPriority;

LIST OF INTERRUPTS ARE BELOW // /**** Cortex-M3 Processor Exceptions Numbers **************************************************/ NonMaskableInt_IRQn = -14, /!< 2 Non Maskable Interrupt / HardFault_IRQn = -13, /!< 3 Cortex-M3 Hard Fault Interrupt / MemoryManagement_IRQn = -12, /!< 4 Cortex-M3 Memory Management Interrupt / BusFault_IRQn = -11, /!< 5 Cortex-M3 Bus Fault Interrupt / UsageFault_IRQn = -10, /!< 6 Cortex-M3 Usage Fault Interrupt / SVCall_IRQn = -5, /!< 11 Cortex-M3 SV Call Interrupt / DebugMonitor_IRQn = -4, /!< 12 Cortex-M3 Debug Monitor Interrupt / PendSV_IRQn = -2, /!< 14 Cortex-M3 Pend SV Interrupt / SysTick_IRQn = -1, /!< 15 Cortex-M3 System Tick Interrupt */

/****** STM32 specific Interrupt Numbers ********************************************************/ WWDG_IRQn = 0, /!< Window WatchDog Interrupt / PVD_IRQn = 1, /!< PVD through EXTI Line detection Interrupt / TAMPER_IRQn = 2, /!< Tamper Interrupt / RTC_IRQn = 3, /!< RTC global Interrupt / FLASH_IRQn = 4, /!< FLASH global Interrupt / RCC_IRQn = 5, /!< RCC global Interrupt / EXTI0_IRQn = 6, /!< EXTI Line0 Interrupt / EXTI1_IRQn = 7, /!< EXTI Line1 Interrupt / EXTI2_IRQn = 8, /!< EXTI Line2 Interrupt / EXTI3_IRQn = 9, /!< EXTI Line3 Interrupt / EXTI4_IRQn = 10, /!< EXTI Line4 Interrupt / DMA1Channel1IRQn = 11, /!< DMA1 Channel 1 global Interrupt / DMA1Channel2IRQn = 12, /!< DMA1 Channel 2 global Interrupt / DMA1Channel3IRQn = 13, /!< DMA1 Channel 3 global Interrupt / DMA1Channel4IRQn = 14, /!< DMA1 Channel 4 global Interrupt / DMA1Channel5IRQn = 15, /!< DMA1 Channel 5 global Interrupt / DMA1Channel6IRQn = 16, /!< DMA1 Channel 6 global Interrupt / DMA1Channel7IRQn = 17, /!< DMA1 Channel 7 global Interrupt / ADC12IRQn = 18, /!< ADC1 and ADC2 global Interrupt / USBHPCAN1TXIRQn = 19, /!< USB Device High Priority or CAN1 TX Interrupts / USBLPCAN1RX0IRQn = 20, /!< USB Device Low Priority or CAN1 RX0 Interrupts / CAN1RX1IRQn = 21, /!< CAN1 RX1 Interrupt / CAN1SCEIRQn = 22, /!< CAN1 SCE Interrupt / EXTI95IRQn = 23, /!< External Line[9:5] Interrupts / TIM1BRKIRQn = 24, /!< TIM1 Break Interrupt / TIM1UPIRQn = 25, /!< TIM1 Update Interrupt / TIM1TRGCOM_IRQn = 26, /!< TIM1 Trigger and Commutation Interrupt / TIM1CCIRQn = 27, /!< TIM1 Capture Compare Interrupt / TIM2_IRQn = 28, /!< TIM2 global Interrupt / TIM3_IRQn = 29, /!< TIM3 global Interrupt / TIM4_IRQn = 30, /!< TIM4 global Interrupt / I2C1EVIRQn = 31, /!< I2C1 Event Interrupt / I2C1ERIRQn = 32, /!< I2C1 Error Interrupt / I2C2EVIRQn = 33, /!< I2C2 Event Interrupt / I2C2ERIRQn = 34, /!< I2C2 Error Interrupt / SPI1_IRQn = 35, /!< SPI1 global Interrupt / SPI2_IRQn = 36, /!< SPI2 global Interrupt / USART1_IRQn = 37, /!< USART1 global Interrupt / USART2_IRQn = 38, /!< USART2 global Interrupt / USART3_IRQn = 39, /!< USART3 global Interrupt / EXTI1510IRQn = 40, /!< External Line[15:10] Interrupts / RTCAlarmIRQn = 41, /!< RTC Alarm through EXTI Line Interrupt / USBWakeUp_IRQn = 42, /!< USB Device WakeUp from suspend through EXTI Line Interrupt / TIM8BRKIRQn = 43, /!< TIM8 Break Interrupt / TIM8UPIRQn = 44, /!< TIM8 Update Interrupt / TIM8TRGCOM_IRQn = 45, /!< TIM8 Trigger and Commutation Interrupt / TIM8CCIRQn = 46, /!< TIM8 Capture Compare Interrupt / ADC3_IRQn = 47, /!< ADC3 global Interrupt / FSMC_IRQn = 48, /!< FSMC global Interrupt / SDIO_IRQn = 49, /!< SDIO global Interrupt / TIM5_IRQn = 50, /!< TIM5 global Interrupt / SPI3_IRQn = 51, /!< SPI3 global Interrupt / UART4_IRQn = 52, /!< UART4 global Interrupt / UART5_IRQn = 53, /!< UART5 global Interrupt / TIM6_IRQn = 54, /!< TIM6 global Interrupt / TIM7_IRQn = 55, /!< TIM7 global Interrupt / DMA2Channel1IRQn = 56, /!< DMA2 Channel 1 global Interrupt / DMA2Channel2IRQn = 57, /!< DMA2 Channel 2 global Interrupt / DMA2Channel3IRQn = 58, /!< DMA2 Channel 3 global Interrupt / DMA2Channel45_IRQn = 59, /!< DMA2 Channel 4 and Channel 5 global Interrupt */ } IRQn_Type;

~~~~

I AM NOT ABLE UNDERSTAND WHERE I AM MAKING MISTAKE.

configLIBRARYLOWESTINTERRUPTPRIORITY looks very wrong. It should probably be 15 (4 bits, as defined by configPRIOBITS).

HI All,

@Real Time Engineers ltd. - Code works with even with configLIBRARYLOWESTINTERRUPT_PRIORITY 3 because i am not using priority greater than 3.

For ALL Above mention code works completely perfect. Problem: RTS pin direction change not happen after transmitting ...

@Real Time Engineers ltd. :Thanks again @Hein Tibosch -hanks again