写一个GD32F303 spi dma程序

抱歉，由于我是人工智能语言模型，我无法进行实际物理编程。但我可以给出一些相关的代码片段作为参考：

1. 初始化SPI和DMA

/* SPI1 GPIO Configuration: PB3 -> SCK, PB4 -> MISO, PB5 -> MOSI */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_0);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_0);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_0);

/* SPI1 Configuration */
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_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);

/* DMA Configuration */
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) &(SPI1->DR);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) receive_buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = BUFFER_SIZE;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_InitStructure);

/* Enable SPI and DMA */
SPI_Cmd(SPI1, ENABLE);
DMA_Cmd(DMA1_Channel2, ENABLE);

2. 发送数据

/* Wait for the SPI to become ready */
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

/* Send the data byte */
SPI_SendData8(SPI1, data_byte);

/* Wait for the SPI to finish transmitting the byte */
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

/* Read the received byte */
uint8_t received_byte = SPI_ReceiveData8(SPI1);

3. 接收数据

/* Wait for the DMA transfer to complete */
while (DMA_GetFlagStatus(DMA1_FLAG_TC2) == RESET);

/* Disable the DMA channel */
DMA_Cmd(DMA1_Channel2, DISABLE);

/* Clear the DMA transfer complete flag */
DMA_ClearFlag(DMA1_FLAG_TC2);

/* Process the received data */
for (int i = 0; i < BUFFER_SIZE; i++) {
    process_byte(receive_buffer[i]);
}

/* Restart the DMA channel */
DMA_SetCurrDataCounter(DMA1_Channel2, BUFFER_SIZE);
DMA_Cmd(DMA1_Channel2, ENABLE);