3 #include <libopencm3/cm3/cortex.h>
4 #include <libopencm3/cm3/nvic.h>
5 #include <libopencm3/cm3/systick.h>
6 #include <libopencm3/stm32/rcc.h>
7 #include <libopencm3/stm32/gpio.h>
9 static void clock_setup(void)
11 rcc_clock_setup_in_hse_8mhz_out_72mhz();
13 rcc_periph_clock_enable(RCC_GPIOC);
15 rcc_periph_reset_pulse(RST_GPIOC);
18 static void gpio_setup(void)
20 // PC13 = BluePill LED
21 gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
22 gpio_clear(GPIOC, GPIO13);
25 static volatile u32 ms_ticks;
27 void sys_tick_handler(void)
32 static void tick_setup(void)
34 systick_set_frequency(1000, 72000000);
35 systick_counter_enable();
36 systick_interrupt_enable();
39 static void delay_ms(uint ms)
41 u32 start_ticks = ms_ticks;
42 while (ms_ticks - start_ticks < ms)
51 cm_enable_interrupts();
54 gpio_toggle(GPIOC, GPIO13);
56 gpio_toggle(GPIOC, GPIO13);