求助香主，双SPI通信，主机无法发送数据！

只看该作者 · 2012-3-19 20:35

STM32f103测试两个SPI主从收发，只能收到从机发的数据，主机发的数据接收不到。
时钟初始化已经好了。
u8 SPI1_Buffer_Tx[BufferSize] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
                                 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
                                    0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15,
                                    0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C,
                                    0x1D, 0x1E, 0x1F, 0x20};
u8  SPI2_Buffer_Tx[BufferSize] = {0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
                                 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E,
                                 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65,
                                 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C,
                                 0x6D, 0x6E, 0x6F, 0x70};
u8 SPI1_Buffer_Rx[BufferSize], SPI2_Buffer_Rx[BufferSize];

GPIO初始化如下：
/*SPI1_Configuration*/ //PA5=SPI1_SCK;PA6=SPI1_MISO;PA7=SPI1_MOSI;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure SPIz pins: SCK, MISO and MOSI */ //PB13=SPI2_SCK;PB14=SPI2_MISO;PB15=SPI2_MOSI;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);

SPI初始化如下：
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_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);

/* SPIz Config -------------------------------------------------------------*/
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_Init(SPI2, &SPI_InitStructure);

/* Enable SPI1 */
SPI_Cmd(SPI1, ENABLE);
/* Enable SPI2 */
SPI_Cmd(SPI2, ENABLE);

收发程序如下：
while (TxIdx < BufferSize)
{
   /* Wait for SPI1 Tx buffer empty */
   while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

      /* Send SPI2 data */
   SPI_I2S_SendData(SPI2, SPI2_Buffer_Tx[TxIdx]);

      /* Send SPI1 data */
   SPI_I2S_SendData(SPI1, SPI1_Buffer_Tx[TxIdx++]);

   /* Wait for SPI1 data reception */
   while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);
   /* Read SPI2 received data */
   SPI2_Buffer_Rx[RxIdx] = SPI_I2S_ReceiveData(SPI2);
   /* Wait for SPI1 data reception */
   while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
   /* Read SPI1 received data */
   SPI1_Buffer_Rx[RxIdx++] = SPI_I2S_ReceiveData(SPI1);
}
仿真后的结果，SPI1_Buffer_Rx有接收到数据，SPI2_Buffer_Rx没收到！那是不是就证明从机SPI2数据发送正常，主机SPI1发送错误？这是什么原因？求香主及各位大神帮忙看看！