GD32F450ZIT6双机spi通讯

GD32F450ZIT6双机SPI通信的步骤如下：

1. 配置SPI主机和从机：

// 主机配置
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_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_Init(SPI1, &SPI_InitStructure);

// 从机配置
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_Init(SPI2, &SPI_InitStructure);

2. 使能SPI主机和从机：

SPI_Cmd(SPI1, ENABLE);
SPI_Cmd(SPI2, ENABLE);

3. 发送和接收数据：

// 主机发送数据
SPI_I2S_SendData(SPI1, data);

// 从机接收数据
data = SPI_I2S_ReceiveData(SPI2);

4. 等待传输完成：

while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);

5. 关闭SPI主机和从机：

SPI_Cmd(SPI1, DISABLE);
SPI_Cmd(SPI2, DISABLE);