In STM32 microcontrollers using FreeRTOS, the time base source can be generated by different peripherals depending on the specific MCU model and board configuration. One common approach is to use a timer peripheral as the time base source.
Here’s an example of generating a time base using TIM2 peripheral on an STM32 microcontroller:
- Enable the clock for TIM2 peripheral:
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
- Configure the desired prescaler and period values for the timer:
TIM_TimeBaseInitTypeDef timConfig;
timConfig.TIM_Prescaler = 72 - 1; // Assuming APB1 clock is running at 72MHz
timConfig.TIM_Period = 1000 - 1; // Generate interrupt every millisecond
timConfig.TIM_ClockDivision = TIM_CKD_DIV1;
timConfig.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &timConfig);
- Enable the timer update interrupt:
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
- Define the interrupt handler function to handle timer interrupts:
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
// Handle your timing tasks here
// Clear the interrupt flag
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
}
}
- Start the timer:
TIM_Cmd(TIM2, ENABLE);
- Finally, in your main function or initialization code, enable interrupts and start FreeRTOS scheduler:
NVIC_EnableIRQ(TIM2_IRQn);
// Start FreeRTOS scheduler
vTaskStartScheduler();
This is just a basic example demonstrating how to use a timer as a time base source in FreeRTOS on STM32 microcontrollers. Please note that the exact steps may vary depending on your specific requirements and hardware setup. Make sure to consult the documentation and reference manual for your STM32 MCU for accurate configuration details.
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