STM32WB55 - LPTIM1 in interrupt mode

[jmchiappa]

Hello,

I'm struggling in working the LPTIM1 with ARR interrupt on my NUCLEO WB55.
The code is very simple and mostly extracted from CubeMX :

#include "Arduino.h"
#include "stm32wbxx_hal_lptim.h"
#include "stm32wbxx_ll_lptim.h"

#define RED_LED     PB1
#define GREEN_LED   PB0
#define BLUE_LED    PB5

// #define DEBUG

#if defined(DEBUG)
#   define DBG_PRINTLN(a) {Serial.println(a);}
#else
#   define DBG_PRINTLN(a) 0
#endif

#define PERIOD 100000 // us

#define LPTIM_INSTANCE    LPTIM1 // (LPTIM_TypeDef *) LPTIM1_BASE
LPTIM_HandleTypeDef hlptim1;

volatile uint32_t counter = 0;
volatile uint32_t counterIRQ = 0;

void setup(void) {
  pinMode(BLUE_LED,OUTPUT);
  pinMode(GREEN_LED,OUTPUT);
  digitalWrite(BLUE_LED,HIGH);
  digitalWrite(GREEN_LED,HIGH);
  delay(100);
  digitalWrite(BLUE_LED,LOW);
  digitalWrite(GREEN_LED,LOW);
  DBG_PRINTLN("début setup");
  hlptim1.Instance = LPTIM_INSTANCE;
  hlptim1.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
  hlptim1.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV1;
  hlptim1.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
  hlptim1.Init.OutputPolarity = LPTIM_OUTPUTPOLARITY_HIGH;
  hlptim1.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
  hlptim1.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
  hlptim1.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
  hlptim1.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
  Serial.println("init lp timer...");
  if (HAL_LPTIM_Init(&hlptim1) != HAL_OK)
  {
    Error_Handler();
  }
  DBG_PRINTLN("init timer OK.\nstart lp timer ...");
  // Start timer in Time base mode. Required when there is no channel used but only update interrupt.
  HAL_LPTIM_Counter_Start_IT( &hlptim1,16384);
  DBG_PRINTLN("lp timer is running.");
}

void loop(void) {}

void LPTIM1_IRQHandler(void)
{
  digitalToggle(GREEN_LED);
  counterIRQ++;
  HAL_LPTIM_IRQHandler(&hlptim1);
}

extern "C" void HAL_LPTIM_AutoReloadMatchCallback(LPTIM_HandleTypeDef *hlptim) {
    digitalToggle(BLUE_LED);
    counter++;
}

extern "C" void HAL_LPTIM_CompareMatchCallback(LPTIM_HandleTypeDef *hlptim) {
    digitalToggle(BLUE_LED);
    counter++;
}

void HAL_LPTIM_MspInit(LPTIM_HandleTypeDef* hlptim)
{
  DBG_PRINTLN("MSPInit in progress...");
  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
  if(hlptim->Instance==LPTIM_INSTANCE)
  {
    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LPTIM1;
    PeriphClkInitStruct.Lptim1ClockSelection = LL_RCC_LPTIM1_CLKSOURCE_PCLK1;
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
    {
      Error_Handler();
    }

    /* Peripheral clock enable */
    __HAL_RCC_LPTIM1_CLK_ENABLE();

  /* ## - 2 - Force & Release the LPTIM Periheral Clock Reset ############### */  
  /* Force the LPTIM Peripheral Clock Reset */
  __HAL_RCC_LPTIM1_FORCE_RESET();
  
  /* Release the LPTIM Peripheral Clock Reset */
  __HAL_RCC_LPTIM1_RELEASE_RESET();

    /* LPTIM1 interrupt Init */
    HAL_NVIC_SetPriority(LPTIM1_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(LPTIM1_IRQn);
    DBG_PRINTLN("MSPInit OK.");
  }
}

The interrupt handler always falls in the defaultHandler which is an infinite loop.
Maybe something is missing...
Helps would be very appreciate.

framework : stm32duino 2.3.0 and tested with stm32duino 2.5.0 too
board : PNUCLEO WB55

Thanks
jm

[fpistm]

void LPTIM1_IRQHandler(void)

Add extern "C" before

[jmchiappa]

it works, thank you @fpistm