linux基于arma8的裸机led驱动



linux基于arma8的裸机led驱动
 
#include "s5pc100.h" 
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int main() 
{ 
int i; 
 
//GPG3.GPG3CON=(GPG3.GPG3CON & ~0xF) |1<<0; 
asm( 
"ldr r0,=0xE03001c0\n\t" 
"mov r1,#0x100\n\t" 
"strb r1,[r0]\n\t" 
); 
 
while(1) 
{ 
//GPG3.GPG3DAT=(GPG3.GPG3DAT &~0x01)|1<<0; 
 
asm( 
"ldr r0,=0xE03001c4\n\t" 
"mov r1,#0x4\n\t" 
"strb r1,[r0]\n\t" 
); 
for(i=100000;i>0;i--); 
//GPG3.GPG3DAT=(GPG3.GPG3DAT &~0x01); 
asm( 
"ldr r0,=0xE03001c4\n\t" 
"mov r1,#0x0\n\t" 
"strb r1,[r0]\n\t" 
); 
for(i=100000;i>0;i--); 
} 
 
return 0; 
}
 

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