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Addressing STM32G070CBT6 Timer Interrupts Not Triggering

Addressing STM32G070CBT6 Timer Interrupts Not Triggering

Troubleshooting STM32G070CBT6 Timer Interrupts Not Triggering

Issue Overview:

The issue of timer interrupts not triggering in the STM32G070CBT6 microcontroller is a common problem that developers might encounter. In such cases, even though the timer is configured properly, the expected interrupt does not occur. This can significantly impact the functionality of applications requiring precise time-based events or periodic tasks.

Possible Causes: Incorrect Timer Configuration: The timer might not be properly configured, and crucial settings like the prescaler, auto-reload register, or interrupt enable flag might be incorrect. Interrupt Priorities and NVIC Configuration: The Nested Vector Interrupt Controller (NVIC) might not have been configured to handle the timer interrupt, or the interrupt priority might be misconfigured, causing the interrupt to be masked. Interrupt Masking or Global Interrupts Disab LED : If global interrupts are disab LED or if the timer interrupt is masked by higher priority interrupts, the timer interrupt will not trigger. Faulty Timer Clock Source: If the timer clock source is not set correctly or is disabled, the timer will not run as expected, and therefore the interrupt will not occur. Faulty Handler Function: If the interrupt service routine (ISR) is not written properly or not linked to the correct interrupt vector, the interrupt won't be processed. Timer Overflow or Misconfigured Period: If the timer’s period is too long or too short, it might not produce the interrupt within the expected time frame. Step-by-Step Solution:

1. Check Timer Configuration:

Ensure that the timer’s prescaler, auto-reload value, and mode are correctly set. Example configuration: c // Set timer prescaler and auto-reload value TIM2->PSC = 16000 - 1; // Prescaler for a 1 ms timer tick (assuming 16 MHz clock) TIM2->ARR = 1000 - 1; // Set the timer to overflow after 1 second TIM2->DIER |= TIM_DIER_UIE; // Enable update interrupt TIM2->CR1 |= TIM_CR1_CEN; // Start the timer

2. Enable Interrupt in NVIC:

Ensure that the interrupt for the timer is enabled in the NVIC. c NVIC_EnableIRQ(TIM2_IRQn); // Enable interrupt for TIM2

3. Check Global Interrupts:

Make sure global interrupts are enabled in the microcontroller. c __enable_irq(); // Enable global interrupts

4. Verify the Interrupt Handler:

Verify that the interrupt handler is correctly defined. The handler function must match the correct interrupt vector. c void TIM2_IRQHandler(void) { if (TIM2->SR & TIM_SR_UIF) { // Check if the update interrupt flag is set TIM2->SR &= ~TIM_SR_UIF; // Clear the interrupt flag // Add code to handle the interrupt (e.g., toggle an LED or update a counter) } }

5. Check Timer Clock Source:

Ensure the timer clock source is enabled and correctly configured. You can check the timer's clock source in the STM32's reference manual to ensure it is not disabled in the RCC (Reset and Clock Control) register.

6. Set the Correct Timer Period:

Make sure the timer’s period (ARR) and prescaler (PSC) are set correctly to achieve the desired interrupt frequency.

7. Test with a Simple Debugging Routine:

Add a simple LED toggle or a flag within the interrupt service routine to test if the interrupt is indeed being triggered.

Example:

void TIM2_IRQHandler(void) { if (TIM2->SR & TIM_SR_UIF) { TIM2->SR &= ~TIM_SR_UIF; // Clear the interrupt flag HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5); // Toggle an LED to indicate interrupt } }

8. Review System Clock Settings:

Ensure that the system clock and timer clock are correctly configured. If the timer’s clock is running too slow or too fast, the timer might not behave as expected. Conclusion:

By following the above steps and thoroughly reviewing the timer, interrupt, and NVIC configurations, you should be able to identify and resolve the issue of timer interrupts not triggering in the STM32G070CBT6. It's important to ensure that the timer, interrupt flags, NVIC, and system clocks are all properly set up and that global interrupts are enabled for the system to function as expected.

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