56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
/* based on example from https://github.com/satoshinm/pill_blink */
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static inline void
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delay(unsigned long ms)
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{
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for (unsigned long i = 0; i < ms; ++i) __asm__("nop");
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}
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static inline void
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led_off() {
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(*(volatile unsigned int *)(0x40011010)) = (1 << 13);
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}
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static inline void
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led_on() {
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(*(volatile unsigned int *)(0x40011014)) = (1 << 13);
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}
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void __attribute__ ((weak, naked)) reset_handler(void) {
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(*(volatile unsigned int *)(0x40021018)) |= (1 << 4);
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(*(volatile unsigned int *)(0x40011004)) |= (0x00 << (((13 - 8) * 4) + 2));
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(*(volatile unsigned int *)(0x40011004)) |= (0x02 << ((13 - 8) * 4));
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while(1) {
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led_off();
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delay(1000000);
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led_on();
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delay(100000);
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led_off();
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delay(100000);
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led_on();
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delay(100000);
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}
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}
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__attribute__ ((section(".vectors")))
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struct {
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unsigned int *initial_sp_value;
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void (*reset)(void);
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void (*nmi)(void);
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void (*hard_fault)(void);
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void (*memory_manage_fault)(void);
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void (*bus_fault)(void);
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void (*usage_fault)(void);
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void (*reserved_x001c[4])(void);
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void (*sv_call)(void);
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void (*debug_monitor)(void);
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void (*reserved_x0034)(void);
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void (*pend_sv)(void);
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void (*systick)(void);
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void (*irq[68])(void);
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} vector_table = {
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.reset = reset_handler,
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};
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