A5口接LED,计划是低电平亮，可是示波器看A5脚电平长期高电位不变，下面是源代码，COSMIC C和STVD7平台，各位大哥帮忙看看哪里不对，谢谢啦。。。
#include <io7flitus.h>
#include <stdlib.h>
/*----Define Bit Operation Macro---*/
#define SetBit(VAR,BIT_NUM) ( (VAR) |= (1<<(BIT_NUM)) )
#define ClrBit(VAR,BIT_NUM) ( (VAR) &= ((1<<(BIT_NUM))^0xFF) )
#define ValBit(VAR,BIT_NUM) ( (VAR) & (1<<(BIT_NUM)) )
#define BitIsClear(VAR,BIT_NUM) ( 0 == ValBit(VAR,BIT_NUM) )
#define BitIsSet(VAR,BIT_NUM) ( !BitIsClear(VAR,BIT_NUM) )
#define EnableInterrupts {_asm ("RIM");}
#define DisableInterrupts {_asm ("SIM");}
#define Nop {_asm ("nop");}
#define WaitforInterrupt {_asm ("wfi");}
#define LED_ON ClrBit(PADR,5)
#define LED_OFF SetBit(PADR,5)
/*---Define functions---*/
void gInitialize(void);
void gDelayms(unsigned char a);
/*---Main routine---*/
void main (void)
{
gInitialize();
while (1)
{
LED_ON;
gDelayms(255);
LED_OFF;
gDelayms(255);
}
}
/*----Function: gDelayms()---*/
void gDelayms(unsigned char a)
{
unsigned short k;
for(k=192*a;k>0;k--);
}
/*---Function: gInitialize()---*/
void gInitialize(void)
{
// Set internal RC clock
RCCR = RCCRH0;
SICSR = RCCRL0;
AVDTHCR = 0x23; //set the internal RC oscillator Prescaler to 4MHz.
// Set input/output pins:
PADDR = 0x3F;
PAOR = 0x3F;
PADR = 0x00; //Clear all output, }
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