Difference between revisions of "STM32F107VC/timer2"
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This sourrce code enables timer2 and initializes it for 10 interrupts pr. second. | This sourrce code enables timer2 and initializes it for 10 interrupts pr. second. | ||
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[[Category:Embedded]] | [[Category:Embedded]] | ||
Latest revision as of 06:21, 5 October 2017
This sourrce code enables timer2 and initializes it for 10 interrupts pr. second.
/*----------------------------------------------------------------------------*
* Name: timer.c /HeTh@mercantec.dk *
* Purpose: Initialize TIM2 and enable IRQHandler for TIM2 *
* Alias: Driver for TIM2 *
* Function to be called to initialize TIM2: timer_init() *
*----------------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "Board_LED.h"
/*
* TIM_DIER_UIE == 1
* TIM_CR1_CEN == 1
*/
/*----------------------------------------------------------------------------
* TIM2 initializer 'timer_init': used to initialize TIM2
*---------------------------------------------------------------------------*/
void timer_init() {
// Enable "timer 2" clock (RCC->APB1ENR bit 0 = 1)
RCC->APB1ENR |= 1;
// Setting prescale value (72.000.000 / 7200 = 10000 Hz) (Side 403 Ref Manual)
TIM2->PSC = 7200 - 1;
// Autoload Register 10000 Hz - 1 (it starts at 0) (Side 354 Ref Manual)
TIM2->ARR = 1000 - 1;
// Enable IRQ interrupt for TIM2
NVIC_EnableIRQ(TIM2_IRQn);
// Enable interrupt on update
TIM2->DIER |= TIM_DIER_UIE; // TIM_DIER_UIE = 1
// Enable Counter (TIM2_CR1 bit 0 = 1)
TIM2->CR1 |= TIM_CR1_CEN; // TIM_CR1_CEN = 1
}
/*----------------------------------------------------------------------------
* TIM2 IRQHANDLER 'TIM2_IRQHandler': run when timer interrupts.
*---------------------------------------------------------------------------*/
void TIM2_IRQHandler(void) __irq{
// Resets the IRQ Handler
static uint8_t ledState=0;
TIM2->SR = 0;
if ( ledState == 0 ) {
LED_On(1);
ledState=1;
} else {
LED_Off(1);
ledState=0;
}
}