STM32 L412 Timer interrupt not working

[SSaiy.1]

I am using STM32L412 microcontroller and doing baremetal programming for timer interrupt. I am using Timer 6 and base clock of 4MHZ is used as HCLK. However my interrupt is not firing below mentioning my code. count variable is also not updating

int main(void)

{

LedConfig();

StartTimer6();

  /* Loop forever */

while(1)

{

count=1;

}

}

void LedConfig(void)

{

/*Enable Clock for Port B. */

RCC->AHB2ENR |= (1U<<1);

/*Configure GPIOB_13 as general purpose output*/

GPIOB->MODER |= (1U<<26);

GPIOB->MODER &= ~(1U<<27);

}

void StartTimer6(void)

{

RCC->APB1ENR1 |= (1U<<4);

TIM6->PSC = 1000;

TIM6->ARR = 4000;

TIM6->EGR |= (1U<<0);

TIM6->DIER |= (1U<<0);

TIM6->CR1 |= (1U<<0);

NVIC_EnableIRQ(TIM6_IRQn);

}

void TIM6_IRQHandler(void)

{

if(TIM6->SR & (1U<<0))

{

GPIOB->ODR ^= (1U<<13);

TIM6->SR &= ~(1U<<0);

}

}

[KnarfB]

no code, no description, no answer...

[SSaiy.1]

@KnarfB​ Sorry, I was entering the details.

[KnarfB]

And CNT register updating?

Ref.man,. talks about delay after enabling peripheral clocks, maybe

RCC->APB1ENR1 |= RCC_APB1ENR1_TIM6EN; // set clock enable flag
 volatile uint32_t dummy = RCC->APB1ENR1; // read back 
 (void)dummy; // avoid "unused" warning

hth

KnarfB

[SSaiy.1]

@KnarfB​ yes CNT is updating.

[KnarfB]

Any other init code before? Works "as is" on my Nucleo-STM32L432KC (LED on PB3) when started from first line in main()

hth

KnarfB

[SSaiy.1]

Nothing except the code I updated here.

[SSaiy.1]

When I tried with Timer 2 this code is working as expected, LED blinks at 1 second interval. Is the Timer 6 of STM32L412 has any additional configuration to made in order to work like this.

This is what I get when I debug.

[KnarfB]

This happens when the specific IRQ handler is not implemented. See the interrupt vector table in the startup code for the proper names. Guess: TIM6_DAC_IRQHandler?

hth

KnarfB

[waclawek.jan]

> See the interrupt vector table in the startup code for the proper names.

+1

I wonder where startup_stm32l412rbtx.s is from - not from https://github.com/STMicroelectronics/STM32CubeL4/tree/master/Drivers/CMSIS/Device/ST/STM32L4xx/Source/Templates

General "interrupt does not fire" troubleshooting steps here.

JW

[SSaiy.1]

when I tried the debug mode startup_stm32l412rbtx.s was autoloading because of the error, it was in the debug folder under projectname.elf -[arm/le]. I got the Handler name from this file.

[KnarfB]

What toolchain / version are you using?

KnarfB

[SSaiy.1]

Thanks @KnarfB as you said IRQ handler was different the actual one is TIM6_DACUNDER_IRQHandler. After I changed the handler name the code started working

[KnarfB]

Glad it works. To add some confusion: stm32l412xx.h (ARM CMSIS) and others contains a line

/* Aliases for __IRQHandler */
#define TIM6_IRQHandler TIM6_DAC_IRQHandler

which covers that error up. But you don't seem to use that.

KnarfB