基於ARM 的led迴圈點亮C程式

基於ARM 的led迴圈點亮C程式

#include "S3C2451.h"#define LED1_CON (1 << 5)#define LED2_CON (1 << 5)#define LED3_CON (1 << 25)#define LED4_CON (1 << 26)/*          Active is low.(LED On)           26            25           6           5           GPA26        GPA25        GPB6        GPB5          LED_4        LED_3        LED_2       LED_1  */void DelayNS(uint32 dly){   uint32 i;   for(; dly > 0; dly--)   {    for(i = 0; i < 50000; i++)    {} }}void led_displayallon(){    rGPBDAT = rGPBDAT | (0x03 << 5);    rGPADAT = rGPADAT | (0x03 << 25);}void led_displayalloff(){    rGPBDAT = rGPBDAT &(~(0x03 << 5));    rGPADAT = rGPADAT &(~(0x03 << 25));}int main(){    rGPBCON = (rGPBCON & (~(0x0f << 10))) | (0x05 << 10);    rGPACON = (rGPACON & (~(0x0f << 25))) | (0x01 << 25);  int i;  while(1){    for(i = 0; i < 5; i++)  {   led_displayallon();   DelayNS(5);   led_displayalloff();   DelayNS(5);}}return 0;}