51单片机驱动DAC芯片TLC5615的程序求助

[scnu_yanghaizhen]

这是我写的程序，编译下载都是没有问题的，就是输出电压一直为零，电路连线确定了好几遍，没有找到问题，请各位大神帮帮忙~



#include <reg51.h>
//-------------------------------------------------
//
//-------------------------------------------------
void delay();
void DA_Conver(unsigned long DAValue);

//--------------------------------------------------
//
//-------------------------------------------------
sbit cs =P1^0;
sbit clk =P1^1;
sbit din =P1^2;
sbit dout =P3^5;
//--------------------------------------------------
void main()
{
long DA_Value =128;
delay();
while(1)
{
DA_Conver(DA_Value);
delay();
da5615(DA_Value);
delay();
}
}


void delay()
{
int i = 5;
while(i--);
}


void DA_Conver(unsigned long DAValue)
{
unsigned char i;
DAValue <<= 6;
cs =0;
clk = 0;
for(i = 0; i < 12; i++){
din=(bit)(DAValue&0x8000);
clk = 1;
DAValue <<= 1;
clk = 0;
}
cs = 1;
clk = 0;
}