1 #include <stdint.h> 2 3 #define LED (*(volatile uint32_t*)0x02000000) 4 5 #define reg_uart_clkdiv (*(volatile uint32_t*)0x02000004) 6 #define reg_uart_data (*(volatile uint32_t*)0x02000008) 7 putchar(char c)8void putchar(char c) 9 { 10 if (c == '\n') 11 putchar('\r'); 12 reg_uart_data = c; 13 } 14 print(const char * p)15void print(const char *p) 16 { 17 while (*p) 18 putchar(*(p++)); 19 } 20 delay()21void delay() { 22 for (volatile int i = 0; i < 250000; i++) 23 ; 24 } 25 main()26int main() { 27 reg_uart_clkdiv = 416; 28 while (1) { 29 LED = 0xFF; 30 print("hello world\n"); 31 delay(); 32 LED = 0x00; 33 delay(); 34 } 35 } 36