为了节省成本，暂时采用AD7792调试系统，成功后换成AD7793。
经过2天的努力搞通了STM32F103x的SPI，关键代码如下：
/* SPI1 Master */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_Cmd(SPI1, ENABLE);
//AD7792 Reset
SPIRx1 = 0;
SPIRx0 = 0;
GPIO_ResetBits(GPIOA, GPIO_Pin_4);
Delay(0x1000);//180ms
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
// Send SPI1 ReadId for read Status register
SPI_I2S_SendData(SPI1,0xFF);
SPI_I2S_SendData(SPI1,0xFF);
SPI_I2S_SendData(SPI1,0xFF);
SPI_I2S_SendData(SPI1,0xFF);
Delay(0x1000);
while( SPIRx0 != 0x80)
{
// Wait for SPI1 Tx buffer empty
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
// Send SPI1 ReadId for read Status register
SPI_I2S_SendData(SPI1,ReadStatus);
Delay(500);
// SCK
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(SPI1, Dummy);
//Wait for SPI1 Rx buffer full
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
SPIRx0 = SPI_I2S_ReceiveData(SPI1);
Delay(0x1000);
}
while( (SPIRx1 & 0x0F) != 0x0A)
{
// Wait for SPI1 Tx buffer empty
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
// Send SPI1 ReadId for read ID register
SPI_I2S_SendData(SPI1,ReadID);
Delay(500);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
// Send SPI1 Dummy for SCK
SPI_I2S_SendData(SPI1, 0xF0);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
SPIRx1 = SPI_I2S_ReceiveData(SPI1);
Delay(0x1000);
}
GPIO_SetBits(GPIOA, GPIO_Pin_4);
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