Read data is 0XF4,0X53,0XFE, how to parse?
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[edited by: ljln119 at 3:25 AM (GMT 0) on 14 Jan 2020]
Read data is 0XF4,0X53,0XFE, how to parse?
When B0 is sent, the received data is hexadecimal 88,40, F0.Actual channel B0= 0.260v.When sending B1, the received data is hexadecimal E8,A7,FC, and the actual channel B1=2.495V.The Numbers don't match.Is the received data high or low?How do I parse data?Thank you very much!
This is the waveform that sends B0,
The waveform received after sending B0
void Write_SPI_Byte(unsigned char SPI_Byte)
{
char bit_mask, k;
SPI_CS(0);//片选
bit_mask = 0x80; // MSB order first
for (k = 0; k < 8; k++)
{
if(SPI_Byte & bit_mask) // load bit value
SPI_SIMO(1);
else
SPI_SIMO(0);
SPI_CLK(1); // clock it out
bit_mask /= 2; // next bit (the "/= 2" provides necessary delay over ">> 1")
SPI_CLK(0); // clock reset
}
SPI_CS(1);
}
//--------------------------------------------------
unsigned char Read_SPI_Byte(void)
{
unsigned char i;
unsigned char SPI_Byte=0;
//SPI_CS(0);//片选
for (i = 0x01; i != 0; i <<= 1) //低位在前，逐位读取
{
if (SPI_SOMI != 0) //首先读取此时的IO引脚，并设置dat中的对应位
{
SPI_Byte |= i;
}
SPI_CLK(1); //然后拉高时钟
SPI_CLK(0); //再拉低时钟，完成一个位的操作
}
return SPI_Byte; //最后返回读到的字节数据
}
void Read_LTC2439_Data(void)
{
unsigned char Data[3]={0,0,0};//从SPI总线读取的数据，Data[0]是最高位
unsigned char i,j;
Write_SPI_Byte(0XB0);
delay_ms(200);
SPI_CS(0);//片选
SPI_Data[0]=Read_SPI_Byte();//接收数据，Data[0]是最高位
SPI_Data[1]=Read_SPI_Byte();//接收数据，
SPI_Data[2]=Read_SPI_Byte();//接收数据
SPI_CS(1);//片选
delay_ms(200);
Write_SPI_Byte(0XB1);
delay_ms(200);
SPI_CS(0);//片选
SPI_Data[4]=Read_SPI_Byte();//接收数据，Data[0]是最高位
SPI_Data[5]=Read_SPI_Byte();//接收数据，
SPI_Data[6]=Read_SPI_Byte();//接收数据
SPI_CS(1);//片选
}
Is there something wrong with my SPI program? Please give me the guidance. Thank you!
