71 lines
1.3 KiB
C
71 lines
1.3 KiB
C
#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/cm3/systick.h>
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#include <libopencmsis/core_cm3.h>
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#include "uart.h"
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#include "fan_ctrl_pwm.h"
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#include "fan_ctrl_dc.h"
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static void clock_setup(void)
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{
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/* We are running on MSI (2.1 MHz) after boot. */
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rcc_periph_clock_enable(RCC_GPIOA); // for basically everything
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rcc_periph_clock_enable(RCC_GPIOC); // for UART only
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/* Enable clocks for USART2. */
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rcc_periph_clock_enable(RCC_USART2);
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}
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/* Set up systick to fire freq times per second */
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static void init_systick(int freq)
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{
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systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
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/* clear counter so it starts right away */
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STK_CVR = 0;
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systick_set_reload(rcc_ahb_frequency / freq);
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systick_counter_enable();
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systick_interrupt_enable();
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}
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int main(void)
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{
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uint64_t timebase_ms = 0;
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// delay startup a bit to allow debugger to connect before debug pins are
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// reconfigured to UART.
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for(uint32_t i = 0; i < 1000000; i++) {
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__asm__("nop");
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}
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clock_setup();
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init_systick(1000);
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uart_init();
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fan_ctrl_pwm_init();
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fan_ctrl_dc_init();
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uart_enqueue("TinyFanControl v" VERSION " initialized.\n");
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// triggered every 1 ms
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while (1) {
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__WFI();
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}
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return 0;
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}
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/* Called when systick fires */
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void sys_tick_handler(void)
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{
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//wait_frame = 0;
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}
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void hard_fault_handler(void)
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{
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while (1);
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}
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