3 #include <libopencm3/cm3/nvic.h>
4 #include <libopencm3/cm3/systick.h>
5 #include <libopencm3/stm32/rcc.h>
6 #include <libopencm3/stm32/gpio.h>
7 #include <libopencm3/stm32/usart.h>
9 static void clock_setup(void)
11 rcc_clock_setup_in_hse_8mhz_out_72mhz();
13 rcc_periph_clock_enable(RCC_GPIOA);
14 rcc_periph_clock_enable(RCC_GPIOC);
15 rcc_periph_clock_enable(RCC_USART1);
18 static void gpio_setup(void)
20 gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
23 static volatile u32 ms_ticks;
25 void sys_tick_handler(void)
30 static void tick_setup(void)
32 systick_set_frequency(1000, 72000000);
33 systick_counter_enable();
34 systick_interrupt_enable();
37 static void delay_ms(uint ms)
39 u32 start_ticks = ms_ticks;
40 while (ms_ticks - start_ticks < ms)
44 static void usart_setup(void)
46 gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
48 usart_set_baudrate(USART1, 115200);
49 usart_set_databits(USART1, 8);
50 usart_set_stopbits(USART1, USART_STOPBITS_1);
51 usart_set_mode(USART1, USART_MODE_TX);
52 usart_set_parity(USART1, USART_PARITY_NONE);
53 usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
67 gpio_toggle(GPIOC, GPIO13);
70 if (cc >= 126) cc = 32;