static void timers_init(void)
{
/* TIM2 is a 32-bit free running counter with 1Mhz frequency */
STM32_TIM_CR2(2) = 0x0000;
STM32_TIM32_ARR(2) = 0xFFFFFFFF;
STM32_TIM32_CNT(2) = 0;
STM32_TIM_PSC(2) = CPU_CLOCK / 1000000 - 1;
STM32_TIM_EGR(2) = 0x0001; /* Reload the pre-scaler */
STM32_TIM_CR1(2) = 1;
STM32_TIM_DIER(2) = 0;
task_enable_irq(STM32_IRQ_TIM2);
}
void tim2_interrupt(void)
{
uint32_t stat = STM32_TIM_SR(2);
if (stat & 2) { /* Event match */
/* disable match interrupt but keep update interrupt */
STM32_TIM_DIER(2) = 1;
last_event = TASK_EVENT_TIMER;
}
if (stat & 1) /* Counter overflow */
clksrc_high++;
STM32_TIM_SR(2) = ~stat & 3; /* clear interrupt flags */
task_clear_pending_irq(STM32_IRQ_TIM2);
}
