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39 lines
1.0 KiB
39 lines
1.0 KiB
void fan_set_power(uint8_t percentage){
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pwm_set(TIM3, 3, percentage);
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}
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uint16_t fan_tach_counter = 0U;
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uint16_t fan_rpm = 0U;
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// Can be way more acurate than this, but this is probably good enough for our purposes.
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// Call this every second
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void fan_tick(void){
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// 4 interrupts per rotation
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fan_rpm = fan_tach_counter * 15U;
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fan_tach_counter = 0U;
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}
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// TACH interrupt handler
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void EXTI2_IRQ_Handler(void) {
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volatile unsigned int pr = EXTI->PR & (1U << 2);
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if ((pr & (1U << 2)) != 0U) {
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fan_tach_counter++;
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}
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EXTI->PR = (1U << 2);
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}
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void fan_init(void){
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// 5000RPM * 4 tach edges / 60 seconds
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REGISTER_INTERRUPT(EXTI2_IRQn, EXTI2_IRQ_Handler, 700U, FAULT_INTERRUPT_RATE_TACH)
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// Init PWM speed control
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pwm_init(TIM3, 3);
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// Init TACH interrupt
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register_set(&(SYSCFG->EXTICR[0]), SYSCFG_EXTICR1_EXTI2_PD, 0xF00U);
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register_set_bits(&(EXTI->IMR), (1U << 2));
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register_set_bits(&(EXTI->RTSR), (1U << 2));
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register_set_bits(&(EXTI->FTSR), (1U << 2));
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NVIC_EnableIRQ(EXTI2_IRQn);
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} |