ISR does not context switch out to its respective task using freeRTOS

[CLeo.1]

Hi everyone, first time using freeRTOS and everything is working besides context switching from an ISR.

The STM32H743ZI has DMA (DMA1_Stream0) setup as UART Rx. This triggers an ISR that sends a queue for task synchronization, as the task that receive the queue will now process the data within the DMA Rx buffer.

Issue is the code gets hung up at "xQueueSendFromISR(CLIQueue, &temp, 0);"

The task priority is = 2 and its the only task in the system thus far

Configuration that I used/done

I am using freeRTOS Version: "V10.4.4+" Located in task.h

PORT: GCC/ARM_CM4F

HEAP: Using Heap 4

Language: C++

Note I also commented out "stm32h7xx_it.c" as there were duplicates of the handlers

Any guidance would be grateful

FreeRTOSConfig.h:

/*
 * FreeRTOS V202107.00
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * http://www.FreeRTOS.org
 * http://aws.amazon.com/freertos
 *
 * 1 tab == 4 spaces!
 */
 
#ifndef FREERTOS_CONFIG_H
#define FREERTOS_CONFIG_H
 
/*-----------------------------------------------------------
 * Application specific definitions.
 *
 * These definitions should be adjusted for your particular hardware and
 * application requirements.
 *
 * THESE PARAMETERS ARE DESCRIBED WITHIN THE 'CONFIGURATION' SECTION OF THE
 * FreeRTOS API DOCUMENTATION AVAILABLE ON THE FreeRTOS.org WEB SITE.
 *
 * See http://www.freertos.org/a00110.html.
 *----------------------------------------------------------*/
 
/* Ensure definitions are only used by the compiler, and not by the assembler. */
#if defined(__ICCARM__) || defined(__CC_ARM) || defined(__GNUC__)
  #include <stdint.h>
  extern uint32_t SystemCoreClock;
#endif
 
#define configUSE_PREEMPTION					1
#define configSUPPORT_STATIC_ALLOCATION			1
#define configSUPPORT_DYNAMIC_ALLOCATION		1
#define configUSE_IDLE_HOOK						0
#define configUSE_TICK_HOOK						0
#define configCPU_CLOCK_HZ						( 480e6)
#define configTICK_RATE_HZ						( ( TickType_t ) 1000 )
#define configMAX_PRIORITIES					( 56 )
#define configMINIMAL_STACK_SIZE				( ( uint16_t ) 512 )
#define configTOTAL_HEAP_SIZE					( ( size_t ) 15 * 1024 )
#define configMAX_TASK_NAME_LEN					( 16 )
#define configUSE_TRACE_FACILITY				1
#define configUSE_16_BIT_TICKS					0
#define configUSE_MUTEXES						1
#define configQUEUE_REGISTRY_SIZE				8
#define configUSE_RECURSIVE_MUTEXES				1
#define configUSE_COUNTING_SEMAPHORES			1
#define configUSE_PORT_OPTIMISED_TASK_SELECTION	0
#define configUSE_MALLOC_FAILED_HOOK			1
#define configCHECK_FOR_STACK_OVERFLOW			2
 
/* Defaults to size_t for backward compatibility, but can be changed
 * if lengths will always be less than the number of bytes in a size_t. */
#define configMESSAGE_BUFFER_LENGTH_TYPE		size_t
/* USER CODE END MESSAGE_BUFFER_LENGTH_TYPE */
 
/* Software timer definitions. */
#define configUSE_TIMERS						1
#define configTIMER_TASK_PRIORITY				( 2 )
#define configTIMER_QUEUE_LENGTH				10
#define configTIMER_TASK_STACK_DEPTH			256
 
/* Set the following definitions to 1 to include the API function, or zero
 * to exclude the API function. */
#define INCLUDE_vTaskPrioritySet				1
#define INCLUDE_uxTaskPriorityGet				1
#define INCLUDE_vTaskDelete						1
#define INCLUDE_vTaskCleanUpResources			0
#define INCLUDE_vTaskSuspend					1
#define INCLUDE_vTaskDelayUntil					1
#define INCLUDE_vTaskDelay						1
#define INCLUDE_xTaskGetSchedulerState			1
#define INCLUDE_xTimerPendFunctionCall			1
#define INCLUDE_xQueueGetMutexHolder			1
#define INCLUDE_uxTaskGetStackHighWaterMark		1
#define INCLUDE_eTaskGetState					1
 
/* Cortex-M specific definitions. */
#ifdef __NVIC_PRIO_BITS
	/* __BVIC_PRIO_BITS will be specified when CMSIS is being used. */
	#define configPRIO_BITS						__NVIC_PRIO_BITS
#else
	#define configPRIO_BITS						4
#endif
 
/* The lowest interrupt priority that can be used in a call to a "set priority"
 * function. */
#define configLIBRARY_LOWEST_INTERRUPT_PRIORITY	15
 
/* The highest interrupt priority that can be used by any interrupt service
 * routine that makes calls to interrupt safe FreeRTOS API functions.  DO NOT
 * CALL INTERRUPT SAFE FREERTOS API FUNCTIONS FROM ANY INTERRUPT THAT HAS A
 * HIGHER PRIORITY THAN THIS! (higher priorities are lower numeric values. */
#define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 5
 
/* Interrupt priorities used by the kernel port layer itself.  These are generic
 * to all Cortex-M ports, and do not rely on any particular library functions. */
#define configKERNEL_INTERRUPT_PRIORITY				( configLIBRARY_LOWEST_INTERRUPT_PRIORITY << ( 8 - configPRIO_BITS ) )
/* !!!! configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to zero !!!!
See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
#define configMAX_SYSCALL_INTERRUPT_PRIORITY		( configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY << ( 8 - configPRIO_BITS ) )
 
/* Normal assert() semantics without relying on the provision of an assert.h
 * header file. */
#define configASSERT( x )							if ( ( x ) == 0 ) { taskDISABLE_INTERRUPTS(); for( ;; ); }
 
/* Definitions that map the FreeRTOS port interrupt handlers to their CMSIS
 * standard names. */
#define vPortSVCHandler								SVC_Handler
#define xPortPendSVHandler							PendSV_Handler
#define xPortSysTickHandler							SysTick_Handler
 
/* Allow system call from within FreeRTOS kernel only. */
#define configENFORCE_SYSTEM_CALLS_FROM_KERNEL_ONLY	1
 
/* STM32H743 has 16 MPU regions and therefore it is necessary to configure
 * configTOTAL_MPU_REGIONS correctly. */
#define configTOTAL_MPU_REGIONS						16
 
/* The default TEX,S,C,B setting marks the SRAM as shareable and as a result,
 * disables cache. Do not mark the SRAM as shareable because caching is being
 * used. TEX=0, S=0, C=1, B=1. */
#define configTEX_S_C_B_SRAM						( 0x03UL )
 
#endif /* FREERTOS_CONFIG_H */

Code: ISR

extern "C" void DMA1_Stream0_IRQHandler() {
 
    uint8_t temp = 1;
    LL_DMA_ClearFlag_TC0(DMA1);
    xQueueSendFromISR(CLIQueue, &temp, 0);
    portYIELD_FROM_ISR();
}

Code: TASK

void processCLITask(void * p) {
 
    uint8_t temp;
 
    while(1) {
 
        xQueueReceive(CLIQueue, &temp, portMAX_DELAY);
        //Logic
    }
 
}

[KnarfB]

What is your ISR priority, see comment for configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY

[CLeo.1]

Ahhh, the NVIC handler is at currently 0, so I guess thats the highest which is higher than 0. So I gotta replace that 5 with a zero I guess? and change my nvic interrupt to anything else besides 0?

[CLeo.1]

Nevermind, I cant make it zero, but I guess just change the NVIC prio to anything > 5?

[KnarfB]

right, should work.

[CLeo.1]

Ill check once I am home, thank you amigo

[CLeo.1]

Alright, back home and tested.

So, it no longer gets stuck there, however its now directing to a fault handler saying this  

 .section .text.Default_Handler,"ax",%progbits

Default_Handler:

Infinite_Loop:

 b Infinite_Loop

 .size Default_Handler, .-Default_Handler

located in startup_stm32h743zitx.s

and MCU program seize to stop