71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/cm3/systick.h>
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#include <libopencm3/stm32/flash.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/rcc.h>
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#include <stdint.h>
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volatile uint64_t ticks;
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static void gpio_setup(void) {
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rcc_periph_clock_enable(RCC_GPIOC);
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
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}
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void sys_tick_handler(void) { ticks++; }
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static void sys_tick_setup(void) {
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ticks = 0;
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// rcc_clock_setup_pll(&rcc_hse_configs[RCC_CLOCK_HSE16_72MHZ]);
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// systick_set_clocksource(STK_CSR_CLKSOURCE_AHB_DIV8);
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systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
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// systick_set_reload(48000 - 1);
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systick_set_frequency(1000, 72000000);
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systick_clear();
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systick_interrupt_enable();
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systick_counter_enable();
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return;
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}
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static uint64_t sys_ticks_get(void) { return ticks; }
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static void delay(volatile uint32_t count) {
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while (count-- > 0) {
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__asm__("nop");
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}
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}
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int main(void) {
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rcc_clock_setup_pll(&rcc_hse_configs[RCC_CLOCK_HSE8_72MHZ]);
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// rcc_clock_setup_pll(&rcc_hse_configs[RCC_CLOCK_HSI_48MHZ]);
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gpio_setup();
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sys_tick_setup();
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gpio_clear(GPIOC, GPIO13);
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gpio_set(GPIOC, GPIO13);
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// gpio_set(GPIOB, GPIO6); /* LED2 off */
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// ticks = 0;
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uint64_t init = sys_ticks_get();
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while (sys_ticks_get() == init);
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/* We call this handler every 1ms so 1000ms = 1s on/off. */
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uint64_t ref = 0;
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while (1) {
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if (sys_ticks_get() > ref) {
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ref += 500;
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gpio_toggle(GPIOC, GPIO13);
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// while (sys_ticks_get() % 1000 == 0);
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}
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}
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while (1);
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return 0;
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}
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