Electrical Engineering Asked by Pokloha on December 19, 2021
So i’m learning FreeRTOS on STM32 and currently following a tutorial to get things started. Following are my concerns with the first one being the most:
I have two threads, but upon running a scheduler, I see a hardfault. But when I run a single thread, I see no issues. I initially thought it’d be related to the stack size but each thread is taking up 130 * 4 = 520 bytes
.
Does stack size refer to the word size in the context of rtos? (if the stack is 16-bits wide and usStackDepth is 100, then 200 bytes will be allocated for use as the task’s stack)
TaskHandle_t
is a pointer to struct tskTaskControlBlock
. Then why is the address of the xTaskBlinky
passed to the last parameter of xTaskCreate()
, which takes TaskHandle_t * const pxCreatedTask )
?
typedef struct tskTaskControlBlock* TaskHandle_t; // in task.h
// main.c
TaskHandle_t xTaskBlinky = NULL;
TaskHandle_t xTaskBlinky1 = NULL;
void vTask1_Handler(void *params);
void vTask2_Handler(void *params);
void SystemClock_Config(void);
int main(void)
{
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* Configure the system clock */
SystemClock_Config();
xTaskCreate(vTask1_Handler, "Blinky", configMINIMAL_STACK_SIZE, NULL, 2, &xTaskBlinky);
xTaskCreate(vTask2_Handler, "Blinky1", configMINIMAL_STACK_SIZE, NULL, 2, &xTaskBlinky1);
vTaskStartScheduler();
while (1);
}
void vTask1_Handler(void *params)
{
while(1);
}
void vTask2_Handler(void *params)
{
while(1);
}
And the program goes into the infinite loop upon running a scheduler:
* @brief This is the code that gets called when the processor receives an
* unexpected interrupt. This simply enters an infinite loop, preserving
* the system state for examination by a debugger.
* @param None
* @retval None
*/
.section .text.Default_Handler,"ax",%progbits
Default_Handler:
Infinite_Loop:
b Infinite_Loop
.size Default_Handler, .-Default_Handler
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