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想做一個(gè)ADE7758的SPI通信驅(qū)動(dòng)程序，用的STVD軟件庫(kù)函數(shù),模擬SPi讀寫(xiě)ADE7758寄存器，程序如下：
void SPI_Write(unsigned char type,unsigned long int wdata,unsigned char databit)
{
unsigned char loop = 0;
type = type & 0x7F;
type = type | 0x80;
GPIO_WriteLow(SCLK); //時(shí)鐘
GPIO_WriteLow(NCS); //片選信號(hào)
for(loop = 0; loop < 8; loop++)
{
GPIO_WriteHigh(SCLK);
nop();
if(type&0x80)
GPIO_WriteHigh(DIN);
else
GPIO_WriteLow(DIN);
nop();
GPIO_WriteLow(SCLK);
nop();
type = (type << 1);
nop();
}//end of for()
delayus(10);
for(loop = 0; loop < databit; loop++)
{
GPIO_WriteHigh(SCLK);
nop();
if(wdata&0x800000)//24位
GPIO_WriteHigh(DIN);
else
GPIO_WriteLow(DIN);
nop();
GPIO_WriteLow(SCLK);
nop();
wdata = (wdata << 1);
nop();
}//end of for()
GPIO_WriteHigh(NCS);
}//end of write7758()
unsigned long SPI_Read(unsigned char type,unsigned char databit)
{
unsigned char loop;
unsigned long rtdata = 0;
type = type & 0x7F;
type = type | 0x00;
GPIO_WriteLow(SCLK);
GPIO_WriteLow(NCS);
for(loop = 0;loop < 8;loop ++)
{
GPIO_WriteHigh(SCLK);
nop();
if(type&0x80)
GPIO_WriteHigh(DIN);
else
GPIO_WriteLow(DIN);
nop();
GPIO_WriteLow(SCLK);
nop();
type = (type << 1);
nop();
}
delayus(10);
for(loop = 0;loop < databit;loop ++)
{ rtdata = (rtdata << 1);
GPIO_WriteHigh(SCLK);
nop();
if(GPIO_ReadInputPin(DOUT))
rtdata |=0x01;
nop();
GPIO_WriteLow(SCLK);
nop();
}
GPIO_WriteHigh(NCS);
return(rtdata);
}//end of read7758()
同時(shí)讀寫(xiě)3個(gè)電壓增益寄存器，寄存器為有符號(hào)12位
SPI_Write(0x24,0x055500,16); //寫(xiě)相位A的電壓增益寄存器
SPI_Write(0x25,0x055500,16); //寫(xiě)相位B的電壓增益寄存器
SPI_Write(0x26,0x055500,16); //寫(xiě)相位C的電壓增益寄存器
DATA[0]= SPI_Read(0x24,16);
DATA[1]= SPI_Read(0x25,16);
DATA[2]= SPI_Read(0x26,16);
仿真了一下得的結(jié)果不一樣
DATA[0]=1365
DATA[1]=1195
DATA[2]=1365
A、C相數(shù)是對(duì)的，B相不對(duì)，讀電流增益寄存器正好相反B相是對(duì)的，AC錯(cuò)了，是時(shí)序有問(wèn)題還是其他原因，求幫助。
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