GD32F470 DMA 写入SPI Flash,第一节多写入一个0

只看该作者 · 2024-11-6 16:17

      GD32F470 使用SPI 的DMA对SPI Flash写入时，写入位置的第一字节被写入了一个0，数据依次被写入到后面位置，如写入flash位置从0开始写入 100字节个数据（如 1，2，3.....100）。再从0位置读出100个，数据为（0，1，2，3...99) 第101个的位置为100。请问这个什么原因引起的。
SPI 与 DMA 的初始函数如下。

void DMA1_Channel3_IRQHandler(void)
{
if(dma_interrupt_flag_get(DMA1, DMA_CH3, DMA_INT_FLAG_FTF))
{
      // 清除中断标志位
      dma_interrupt_flag_clear(DMA1, DMA_CH3, DMA_INT_FLAG_FTF);
      // 在这里进行传输完成后的操作，例如关闭SPI Flash片选信号等
      SPI_FLASH_CS_HIGH();
   printf("数据发送完成\n");
      // 可以进行其他数据处理或者触发下一次传输等操作
}
}

void spi_flash_init(void)
{
spi_parameter_struct spi_init_struct;

rcu_periph_clock_enable(RCU_GPIOB);
rcu_periph_clock_enable(RCU_SPI0);

/* SPI0_CLK(PB3), SPI0_MISO(PB4), SPI0_MOSI(PB5) GPIO pin configuration */
gpio_af_set(GPIOB, GPIO_AF_5, GPIO_PIN_3|GPIO_PIN_4| GPIO_PIN_5);
gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_3|GPIO_PIN_4| GPIO_PIN_5);
gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_25MHZ, GPIO_PIN_3|GPIO_PIN_4| GPIO_PIN_5);

/* SPI0_CS(PE2) GPIO pin configuration */
   rcu_periph_clock_enable(RCU_GPIOE);
gpio_mode_set(GPIOE, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_2);
gpio_output_options_set(GPIOE, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_2);

/* chip select invalid */
SPI_FLASH_CS_HIGH();

/* SPI0 parameter config */
spi_init_struct.trans_mode          = SPI_TRANSMODE_FULLDUPLEX;
spi_init_struct.device_mode       = SPI_MASTER;
spi_init_struct.frame_size          = SPI_FRAMESIZE_8BIT;
spi_init_struct.clock_polarity_phase = SPI_CK_PL_LOW_PH_1EDGE;
spi_init_struct.nss                = SPI_NSS_SOFT;
spi_init_struct.prescale          = SPI_PSC_32;
spi_init_struct.endian             = SPI_ENDIAN_MSB;
spi_init(SPI0, &spi_init_struct);

/* enable SPI0 */
spi_enable(SPI0);
}

// DMA初始化函数
void dma_init(uint8_t *data_buffer, uint32_t data_length)
{
dma_single_data_parameter_struct dma_init_struct;

rcu_periph_clock_enable(RCU_DMA1);

dma_deinit(DMA1, DMA_CH3);

// DMA初始化参数设置
dma_init_struct.direction = DMA_MEMORY_TO_PERIPH;

dma_init_struct.memory0_addr = (uint32_t)data_buffer;
dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;

   dma_init_struct.periph_addr = (uint32_t)&SPI_DATA(SPI0);
dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;

dma_init_struct.periph_memory_width = DMA_MEMORY_WIDTH_8BIT;

dma_init_struct.number = data_length+4;

dma_init_struct.circular_mode = DMA_CIRCULAR_MODE_DISABLE;
dma_init_struct.priority = DMA_PRIORITY_LOW;
   dma_single_data_mode_init(DMA1, DMA_CH3,  &dma_init_struct);

   dma_channel_subperipheral_select(DMA1, DMA_CH3, DMA_SUBPERI3);

// 使能DMA中断通道
nvic_irq_enable(DMA1_Channel3_IRQn, 0, 0);
// 配置DMA中断使能位
// dma_circulation_disable(DMA1, DMA_CH3);
   dma_interrupt_enable(DMA1, DMA_CH3, DMA_CHXCTL_FTFIE);



}

int8_t spi_dma_data_send(uint8_t* pbuffer, uint32_t write_addr, uint16_t num_byte_to_write)
{

   /* enable the write access to the flash */
spi_flash_write_enable();

/* select the flash: chip select low */
SPI_FLASH_CS_LOW();

   pbuffer[0] = WRITE;
   pbuffer[1] = (write_addr & 0xFF0000) >> 16;
   pbuffer[2] = (write_addr & 0xFF00) >> 8;
   pbuffer[3] = write_addr & 0xFF ;

   if(st_spi_flash_err.SpiSendRecv !=0)//以上操作其中之一发生超时，出错
   {
      printf("SPI Send Buffer Empty Timeout Error!\n");
      SPI_FLASH_CS_HIGH();
      return -1;
}

dma_channel_disable(DMA1, DMA_CH3);

   /* set DMA Memory base address */
   dma_memory_address_config(DMA1, DMA_CH3, DMA_MEMORY_0, (uint32_t)pbuffer);

   /* set the number of remaining data to be transferred by the DMA */
   dma_transfer_number_config(DMA1, DMA_CH3,4 + num_byte_to_write);

   /* enable DMA channel */
   dma_channel_enable(DMA1, DMA_CH3);

spi_dma_enable(SPI0,SPI_DMA_TRANSMIT);

return 0;

}