xmos控制一组GPIO

#define LED0 0X01
#define LED1 0x02

#define LED2 0x04

#define LED3 0x08

static unsigned LedState = 0;

out port LEDPORT;

#define TURNON(p) {LedState |= p;\

LEDPORT  <: LedState ; }

#define TURNOFF(p) {LedState &= ~p;\

LEDPORT  <: LedState ; }