Posted on October 03, 2017 at 17:54Hi.
I am currently working with a STM32L476 Discovery board.
I just want to start an interruption handler with a basic timer, but I am facing an issue.
I would like to toggle a LED from the board when the timer is restarting but, for now, the LED doesn't change its state.
It appears that i can go into 'HAL_TIM_PeriodElapsedCallback' but I think this is just for the tick incrementation.
I would like to know why I can't use the handler with my timer.
Thank you for your time.
Here is the code :
uint8_t LCD_String[]= ' STM32L4xx';
GPIO_InitTypeDef s_gpio;
TIM_HandleTypeDef s_timer;
int main(void)
{
HAL_Init();
/* Configure the system clock to 80 MHz */
SystemClock_Config();
InitializeTimer();
/* LCD GLASS Initialization */
BSP_LCD_GLASS_Init();
Init_GPIO();
HAL_NVIC_SetPriority(TIM2_IRQn, 0, 0U);
HAL_NVIC_EnableIRQ(TIM2_IRQn);
uint_least16_t timer_value;
unsigned char show_tab[10];
while(1)
{
timer_value = __HAL_TIM_GetCounter(&s_timer);
sprintf(&show_tab, '%x', timer_value);
BSP_LCD_GLASS_DisplayString(show_tab);
HAL_Delay(100);
}
}
void Init_GPIO()
{
/*
* Initialize GPIO for LED4/LED5
*/
LED4_GPIO_CLK_ENABLE();
LED5_GPIO_CLK_ENABLE();
s_gpio.Mode = GPIO_MODE_OUTPUT_PP;
s_gpio.Pull = GPIO_PULLUP;
s_gpio.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
s_gpio.Pin = LED4_PIN;
HAL_GPIO_Init(LED4_GPIO_PORT, &s_gpio);
s_gpio.Pin = LED5_PIN;
HAL_GPIO_Init(LED5_GPIO_PORT, &s_gpio);
}
void InitializeTimer()
{
__HAL_RCC_TIM2_CLK_ENABLE();
s_timer.Instance = TIM2_BASE;
s_timer.Channel = HAL_TIM_ACTIVE_CHANNEL_1;
s_timer.Init.Prescaler = 40000;
s_timer.Init.CounterMode = TIM_COUNTERMODE_UP;
s_timer.Init.Period = 500;
s_timer.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
s_timer.Init.RepetitionCounter = 0;
HAL_TIM_Base_Init(&s_timer);
/*Starting the timer*/
HAL_TIM_Base_Start(&s_timer);
}
extern void TIM2_IRQHandler()
{
HAL_TIM_IRQHandler(&s_timer);
}
void test()
{
HAL_GPIO_TogglePin(LED4_GPIO_PORT, LED4_PIN);
}
void SystemClock_Config(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
/* MSI is enabled after System reset, activate PLL with MSI as source */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;
RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
RCC_OscInitStruct.PLL.PLLM = 1;
RCC_OscInitStruct.PLL.PLLN = 40;
RCC_OscInitStruct.PLL.PLLR = 2;
RCC_OscInitStruct.PLL.PLLP = 7;
RCC_OscInitStruct.PLL.PLLQ = 4;
if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
/* Initialization Error */
while(1);
}
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
clocks dividers */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
{
/* Initialization Error */
while(1);
}
}
