4 #include <libopencm3/cm3/nvic.h>
5 #include <libopencm3/cm3/systick.h>
6 #include <libopencm3/stm32/rcc.h>
7 #include <libopencm3/stm32/gpio.h>
8 #include <libopencm3/stm32/usart.h>
10 static void clock_setup(void)
12 rcc_clock_setup_in_hse_8mhz_out_72mhz();
14 rcc_periph_clock_enable(RCC_GPIOA);
15 rcc_periph_clock_enable(RCC_GPIOC);
16 rcc_periph_clock_enable(RCC_USART1);
17 rcc_periph_clock_enable(RCC_TIM3);
18 rcc_periph_clock_enable(RCC_DMA1);
21 static void gpio_setup(void)
23 gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
26 static volatile u32 ms_ticks;
28 void sys_tick_handler(void)
33 static void tick_setup(void)
35 systick_set_frequency(1000, 72000000);
36 systick_counter_enable();
37 systick_interrupt_enable();
40 static void delay_ms(uint ms)
42 u32 start_ticks = ms_ticks;
43 while (ms_ticks - start_ticks < ms)
47 static void usart_setup(void)
49 gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
51 usart_set_baudrate(USART1, 115200);
52 usart_set_databits(USART1, 8);
53 usart_set_stopbits(USART1, USART_STOPBITS_1);
54 usart_set_mode(USART1, USART_MODE_TX);
55 usart_set_parity(USART1, USART_PARITY_NONE);
56 usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
70 gpio_toggle(GPIOC, GPIO13);