?? blinky.c
字號:
#include <LPC21xx.H> /* LPC21xx definitions */
//=====================================================================
void wait (void) { /* wait function */
int d;
//比較以下這兩種循環的生成的匯編代碼
for (d = 0; d < 1000000; d++); /* only to delay for LED flashes */
while(--d); /* only to delay for LED flashes */
}
//======================================================================
int main (void) {
unsigned int i; /* LED var */
//PINSEL0=0x00000000; //設置所有引腳連接GPIO
PINSEL1=0x00000000;
IODIR0 = 0x00FF0000; /* P0.16..23 defined as Outputs */
while (1) { /* Loop forever */
for (i = 1<<16; i < 1<<23; i <<= 1) { /* Blink LED 0,1,2,3,4,5,6 */
IOSET0 = i; /* Turn on LED */
//IOSET0 = (i-1)&0xFF0000; /* Turn on LED */
wait (); /* call wait function */
IOCLR0 = i; /* Turn off LED */
//IOCLR0 = (i-1)&0xFF0000; /* Turn off LED */
}
for (i = 1<<23; i > 1<<16; i >>=1 ) { /* Blink LED 7,6,5,4,3,2,1 */
//IOSET0 = (i-1)&0xFF0000; /* Turn on LED */
IOSET0 = i; /* Turn on LED */
wait (); /* call wait function */
//IOCLR0 = (i-1)&0xFF0000; /* Turn off LED */
IOCLR0 = i; /* Turn off LED */
}
}
}
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