1 typedef unsigned int uint32_t;
3 #define GPIOC 0x40011000 // port C
4 #define GPIOC_CRH (GPIOC + 0x04) // port configuration register high
5 #define GPIOC_ODR (GPIOC + 0x0c) // port output data register
6 #define LED_BLUE (1<<8) // pin 8
7 #define LED_GREEN (1<<9) // pin 9
11 register unsigned int i; \
12 for (i = 0; i < 1000000; ++i) \
13 __asm__ __volatile__ ("nop\n\t":::"memory"); \
16 static void __attribute__((naked)) __attribute__((used)) main(void)
18 *(volatile uint32_t*)GPIOC_CRH = 0x44444411;
22 *(volatile uint32_t*)GPIOC_ODR = LED_BLUE | LED_GREEN;
24 *(volatile uint32_t*)GPIOC_ODR = 0;