sandbox/blue-pill/blinky/blinky.c

57 lines
1.2 KiB
C

/* based on example from https://github.com/satoshinm/pill_blink */
#include "bluepill.h"
#define LED_PIN 13
static inline void
delay(unsigned long ms)
{
for (unsigned long i = 0; i < ms; ++i) __asm__("nop");
}
static inline void
led_off() {
clear_pin(GPIO_C, LED_PIN);
}
static inline void
led_on() {
set_pin(GPIO_C, LED_PIN);
}
void __attribute__ ((weak, naked)) reset_handler(void) {
*RCC |= (1 << 4); /* enable port C clock */
output_mode(GPIO_C, LED_PIN, OUTPUT_GPP, OUTPUT_MAX_2MHZ);
while(1) {
led_off();
delay(1000000);
led_on();
delay(100000);
led_off();
delay(100000);
led_on();
delay(100000);
}
}
__attribute__ ((section(".vectors")))
struct {
unsigned int *initial_sp_value;
void (*reset)(void);
void (*nmi)(void);
void (*hard_fault)(void);
void (*memory_manage_fault)(void);
void (*bus_fault)(void);
void (*usage_fault)(void);
void (*reserved_x001c[4])(void);
void (*sv_call)(void);
void (*debug_monitor)(void);
void (*reserved_x0034)(void);
void (*pend_sv)(void);
void (*systick)(void);
void (*irq[68])(void);
} vector_table = {
.reset = reset_handler,
};