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>
8 #include <libopencm3/stm32/usart.h>
9 #include <libopencm3/stm32/timer.h>
11 static void clock_setup(void)
13 rcc_clock_setup_in_hse_8mhz_out_72mhz();
15 rcc_periph_clock_enable(RCC_GPIOA);
16 rcc_periph_clock_enable(RCC_GPIOB);
17 rcc_periph_clock_enable(RCC_GPIOC);
18 rcc_periph_clock_enable(RCC_USART1);
19 rcc_periph_clock_enable(RCC_TIM2);
20 rcc_periph_clock_enable(RCC_AFIO);
22 rcc_periph_reset_pulse(RST_GPIOA);
23 rcc_periph_reset_pulse(RST_GPIOB);
24 rcc_periph_reset_pulse(RST_GPIOC);
25 rcc_periph_reset_pulse(RST_USART1);
26 rcc_periph_reset_pulse(RST_TIM2);
29 static void gpio_setup(void)
31 // PC13 = BluePill LED
32 gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
33 gpio_clear(GPIOC, GPIO13);
36 // gpio_primary_remap(AFIO_MAPR_SWJ_CFG_JTAG_OFF_SW_ON, AFIO_MAPR_TIM2_REMAP_FULL_REMAP);
37 AFIO_MAPR = 0x04000300;
40 static volatile u32 ms_ticks;
42 void sys_tick_handler(void)
47 static void tick_setup(void)
49 systick_set_frequency(1000, 72000000);
50 systick_counter_enable();
51 systick_interrupt_enable();
54 static void delay_ms(uint ms)
56 u32 start_ticks = ms_ticks;
57 while (ms_ticks - start_ticks < ms)
61 static void usart_setup(void)
63 gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
65 usart_set_baudrate(USART1, 115200);
66 usart_set_databits(USART1, 8);
67 usart_set_stopbits(USART1, USART_STOPBITS_1);
68 usart_set_mode(USART1, USART_MODE_TX_RX);
69 usart_set_parity(USART1, USART_PARITY_NONE);
70 usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
82 // cm_enable_interrupts();
83 debug_puts("Hello!\n");
86 timer_set_prescaler(TIM2, 3);
87 timer_set_mode(TIM2, TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
88 timer_disable_preload(TIM2);
89 timer_set_period(TIM2, 65535);
90 timer_set_oc_mode(TIM2, TIM_OC3, TIM_OCM_PWM1);
91 timer_set_oc_value(TIM2, TIM_OC3, 32768);
92 timer_set_oc_polarity_high(TIM2, TIM_OC3);
93 timer_enable_counter(TIM2);
94 timer_enable_oc_output(TIM2, TIM_OC3);
97 gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO10);
98 // gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO10);
99 gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
102 gpio_toggle(GPIOC, GPIO13);
104 gpio_toggle(GPIOA, GPIO15);
106 timer_set_oc_mode(TIM2, TIM_OC3, TIM_OCM_FORCE_LOW);
108 timer_set_oc_mode(TIM2, TIM_OC3, TIM_OCM_FORCE_HIGH);