Add FreeRTOS to Discovery Node IoT Kit

[DSabo]

Has anyone added FreeRTOS to the discovery node iot kit?

I've ported freertos several times before (and have donei t on the Nucleo f411) without issue...but it is getting hung up as I try to get it set up with the discovery kit.

I am setting the sys tick to use tim1... and the code is hitting the default_handler for an unexpected interrupt when the call is made to HAL_TIM_Base_Start_IT in HAL_InitTick.

I can connect with the debugger and see the call stack but it won't step through the code, it says it can't find the source... I'm looking into that as well but I think it's unrelated

In stm32l4xx_hal_timebase_TIM.c:
 
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
TIM_HandleTypeDef        htim1; 
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
 
/**
  * @brief  This function configures the TIM1 as a time base source. 
  *         The time source is configured  to have 1ms time base with a dedicated 
  *         Tick interrupt priority. 
  * @note   This function is called  automatically at the beginning of program after
  *         reset by HAL_Init() or at any time when clock is configured, by HAL_RCC_ClockConfig(). 
  * @param  TickPriority: Tick interrupt priority.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
{
  RCC_ClkInitTypeDef    clkconfig;
  uint32_t              uwTimclock = 0;
  uint32_t              uwPrescalerValue = 0;
  uint32_t              pFLatency;
 
  /*Configure the TIM1 IRQ priority */
  HAL_NVIC_SetPriority(TIM1_UP_TIM16_IRQn, TickPriority ,0);
  
  /* Enable the TIM1 global Interrupt */
  HAL_NVIC_EnableIRQ(TIM1_UP_TIM16_IRQn);
  
  /* Enable TIM1 clock */
  __HAL_RCC_TIM1_CLK_ENABLE();
  
  /* Get clock configuration */
  HAL_RCC_GetClockConfig(&clkconfig, &pFLatency);
  
  /* Compute TIM1 clock */
  uwTimclock = HAL_RCC_GetPCLK2Freq();
   
  /* Compute the prescaler value to have TIM1 counter clock equal to 1MHz */
  uwPrescalerValue = (uint32_t) ((uwTimclock / 1000000) - 1);
  
  /* Initialize TIM1 */
  htim1.Instance = TIM1;
  
  /* Initialize TIMx peripheral as follow:
  + Period = [(TIM1CLK/1000) - 1]. to have a (1/1000) s time base.
  + Prescaler = (uwTimclock/1000000 - 1) to have a 1MHz counter clock.
  + ClockDivision = 0
  + Counter direction = Up
  */
  htim1.Init.Period = (1000000 / 1000) - 1;
  htim1.Init.Prescaler = uwPrescalerValue;
  htim1.Init.ClockDivision = 0;
  htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
  if(HAL_TIM_Base_Init(&htim1) == HAL_OK)
  {
    /* Start the TIM time Base generation in interrupt mode */
    return HAL_TIM_Base_Start_IT(&htim1);
  }
  
  /* Return function status */
  return HAL_ERROR;
}
 
In stm32l4xx.c:
 
extern TIM_HandleTypeDef htim1;
 
/**
  * @brief This function handles TIM1 update interrupt and TIM10 global interrupt.
  */
void TIM1_UP_TIM10_IRQHandler(void)
{
  /* USER CODE BEGIN TIM1_UP_TIM10_IRQn 0 */
 
  /* USER CODE END TIM1_UP_TIM10_IRQn 0 */
  HAL_TIM_IRQHandler(&htim1);
  /* USER CODE BEGIN TIM1_UP_TIM10_IRQn 1 */
 
  /* USER CODE END TIM1_UP_TIM10_IRQn 1 */
}
 
/**
  * @brief  Period elapsed callback in non blocking mode
  * @note   This function is called  when TIM1 interrupt took place, inside
  * HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment
  * a global variable "uwTick" used as application time base.
  * @param  htim : TIM handle
  * @retval None
  */
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
  if (htim->Instance == TIM1) {
    HAL_IncTick();
  }
 
 
}
 
In FreeRTOSConfig.h:
 
/* Definitions that map the FreeRTOS port interrupt handlers to their CMSIS
standard names. */
#define vPortSVCHandler    SVC_Handler
#define xPortPendSVHandler PendSV_Handler
 
/* IMPORTANT: This define is commented when used with STM32Cube firmware, when the timebase source is SysTick,
              to prevent overwriting SysTick_Handler defined within STM32Cube HAL */
#define xPortSysTickHandler SysTick_Handler
 

[DSabo]

I fixed the debugger... interestingly if I step through the code it gets through the HAL_TIM_Base_Start_IT function OK, but hit the unexpected interrupt on the next function call (HAL_MspInit)..