目前用PIC24FJ64GA010驱动AD9951,驱动代码如下:
////////////////////////////////////////////////////////////////////////////////
static void DumpDelay ( void )
{
unsigned char i = 3;
while (i--);
}
////////////////////////////////////////////////////////////////////////////////
// 说明:9951双线接口写操作,上升沿采样输入
static void AD9951TwoLineWr ( unsigned char Data )
{
signed char i;
AD9951_SCLK_LOW ();
SET_AD9951_SDIO_OUTPUT();
for ( i = 7; i >=0; i-- )
{
if ( Data & (1 << i) )
{
AD9951_SDIO_HIGH ();
}
else
{
AD9951_SDIO_LOW ();
}
DumpDelay ();
AD9951_SCLK_HIGH ();
DumpDelay ();
AD9951_SCLK_LOW ();
DumpDelay ();
}
}
////////////////////////////////////////////////////////////////////////////////
// 说明:9951双线接口读操作, 下降沿采样输出
static unsigned char AD9951TwoLineRd ( void )
{
unsigned char Data = 0;
signed char i;
AD9951_SCLK_LOW ();
SET_AD9951_SDIO_INPUT ();
for ( i = 7; i >=0; i-- )
{
AD9951_SCLK_HIGH ();
DumpDelay ();
AD9951_SCLK_LOW ();
DumpDelay ();
if ( IS_AD9951_SDIO_HIGH() )
{
Data |= (1 << i);
}
}
return Data;
}
////////////////////////////////////////////////////////////////////////////////
// 说明:写寄存器
static void AD9951WrReg ( unsigned char Cmd, unsigned char *p_Para, unsigned char Length )
{
unsigned char Temp;
AD9951_CHIP_SEL();
#ifdef AD9951_CTRL_BY_2LINE
AD9951TwoLineWr (Cmd);
#else
Temp = SPITransferByte ( Cmd );
#endif
while ( Length-- )
{
#ifdef AD9951_CTRL_BY_2LINE
AD9951TwoLineWr (*(p_Para++));
#else
Temp = SPITransferByte ( *(p_Para++) );
#endif
}
AD9951_CHIP_DESEL();
DumpDelay ();
AD9951_IO_UPDATE_HIGH();
DumpDelay ();
AD9951_IO_UPDATE_LOW();
}
////////////////////////////////////////////////////////////////////////////////
// 说明:读寄存器
static void AD9951RdReg ( unsigned char Cmd, unsigned char *p_Para, unsigned char Length )
{
unsigned char Temp;
AD9951_CHIP_SEL();
#ifdef AD9951_CTRL_BY_2LINE
AD9951TwoLineWr ( Cmd );
#else
Temp = SPITransferByte ( Cmd );
#endif
while ( Length-- )
{
#ifdef AD9951_CTRL_BY_2LINE
*(p_Para++) = AD9951TwoLineRd ();
#else
*(p_Para++) = SPITransferByte ( 0xff );
#endif
}
AD9951_CHIP_DESEL();
}
////////////////////////////////////////////////////////////////////////////////
// 说明:写32位寄存器
void AD9951WrLongReg ( unsigned char Reg, unsigned long int Para )
{
unsigned char TempBuff[4];
signed char i;
for ( i = 0; i < 4 ; i++ )
{
TempBuff
= Para >> ((3-i)*8);
}
AD9951WrReg ( AD9951_CMD_WR | Reg, &TempBuff[0], 4 );
}
////////////////////////////////////////////////////////////////////////////////
// 说明:读32位寄存器
unsigned long int AD9951RdLongReg ( unsigned char Reg )
{
unsigned long int Data = 0;
unsigned char TempBuff[4], i;
AD9951RdReg ( AD9951_CMD_RD | Reg, &TempBuff[0], 4 );
for ( i = 0; i < 4 ; i++ )
{
Data |= TempBuff;
if ( i < 3 )
{
Data <<= 8;
}
}
return Data;
}
现在情况如下,示波器上面看到写入到AD9951的数据是正确的,但是读到的寄存器值始终不对,按道理, 只要9951上电正常,操作寄存器应该是没问题的
希望有有过9951的朋友指点一下
下面的是DDS电路
DDS驱动电路 (原文件名:DDS电路.JPG)
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