#include "libsys.h" int main (void) { UINT32 *pGPIO0 = (UINT32*)sys_gpio0; UINT32 *pGPIO1 = (UINT32*)sys_gpio1; *pGPIO0 = 0x55555555; *pGPIO1 = 0x55555555; sputs("Hello world!"); *pGPIO0 = 0xAAAAAAAA; *pGPIO1 = 0xAAAAAAAA; return 0; }