请教一下此模拟spi驱动的问题ads1118

ads1118驱动，模拟spi，相关代码如下

unsigned int spi_sendRecvWord(unsigned int c)
{
unsigned int data = 0;
unsigned int shift = 0x8000;
int i = 0; 
//while(!(ADS1118_DO_X))

ADS1118_SCK_0;
delay_us(120);
for ( i = 0; i < 16; i++)
{

if (c & shift)
{ADS1118_DI_1;}
else
{ADS1118_DI_0;}
if(ADS1118_DO_X)
data|=shift; 
ADS1118_SCK_1;
delay_us(60);
//if(ADS1118_DO_X)
//data|=shift; 
ADS1118_SCK_0;
delay_us(60); 
(shift) >>= 1;
}

return data;
}

float ADS1118_V(void) 
{

unsigned int adc=0;
unsigned int Config_Register;
float value=0;

Config_Register =0x8393; 

ADS1118_CS_0;
while((ADS1118_DO_X))
{ADS1118_SCK_1;
delay_us(60);
ADS1118_SCK_0;
delay_us(60);
}
delay_us(100);
adc = spi_sendRecvWord(Config_Register);
spi_sendRecvWord(0x0000); 

/* adc = spi_sendRecvWord(Config_Register);



value=adc;
return value;
}

具体问题是无论我怎么改变写入控制字以及测量输入量，dout返回的都是如下错误波形，大家看看是什麽情况

图一：黄sclk，蓝dout

图二黄sclk，蓝din

图三，黄dout，蓝din