STM32使用SPI的DMA通道读写SD卡时程序卡死怎么办？

2023-03-22 14:09| 来源: 网络整理| 查看: 265

stm32使用SPI用dma通道写SD卡程序卡死

在不使用DMA的情况下是正常读写的，但是改用DMA以后运行时卡死，大概是在这个位置，检测传输完成标志位循环中卡死

#if EN_SPI_Tx_DMA //如果使用SPI发送的DMA DMA_Cmd(DMA1_Channel3,ENABLE); //使能DMA1通道3发送指令 while(DMA_GetFlagStatus(DMA1_FLAG_TC3)==RESET);//等待DMA传输完成 { printf("1"); DMA_Cmd(DMA1_Channel3,DISABLE);//关闭DMA1通道3指令 DMA_ClearFlag(DMA1_FLAG_TC3); //清除传输完成标志位; }

另外DMA和SPI的配置如下：

void DMA_Tx_Init( DMA_Channel_TypeDef* DMA_CHx, u32 ppadr, u32 memadr, u16 bufsize) { DMA_InitTypeDef DMA_InitStructure={0}; RCC_AHBPeriphClockCmd( RCC_AHBPeriph_DMA1, ENABLE ); DMA_DeInit(DMA_CHx); DMA_InitStructure.DMA_PeripheralBaseAddr = ppadr; DMA_InitStructure.DMA_MemoryBaseAddr = memadr; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStructure.DMA_BufferSize = bufsize; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh; DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init( DMA_CHx, &DMA_InitStructure ); //DMA_Cmd(DMA1_Channel3,DISABLE); //关闭DMA1通道3发送指令 } void SPIx_Init(uint16_t speed) { uint16_t tmp; SPI_InitTypeDef SPI_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOD, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); //SPI_FLASH_SPI pins: SCK--PA5 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOA, &GPIO_InitStructure); //SPI_FLASH_SPI pins: MISO--PA6 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; GPIO_Init(GPIOA, &GPIO_InitStructure); //SPI_FLASH_SPI pins: MOSI--PA7 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; GPIO_Init(GPIOA, &GPIO_InitStructure); //SPI_FLASH_SPI_CS_PIN pin: CS--PA4 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIOA, &GPIO_InitStructure); SPI_CS_HIGH(); SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;//SPI1设置为两线全双工 SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置SPI1为主模式 SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //SPI发送接收8位帧结构 SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //串行时钟在不操作时，时钟为高电平 SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //第二个时钟沿开始采样数据 SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS信号由软件（使用SSI位）管理 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //数据传输从MSB位开始 SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC值计算的多项式 SPI_Init(SPI1, &SPI_InitStructure); switch(speed) //设置波特率预分频的值 { case 2: tmp = SPI_BaudRatePrescaler_2;break; case 4: tmp = SPI_BaudRatePrescaler_4;break; case 8: tmp = SPI_BaudRatePrescaler_8;break; case 16: tmp = SPI_BaudRatePrescaler_16;break; case 32: tmp = SPI_BaudRatePrescaler_32;break; case 64: tmp = SPI_BaudRatePrescaler_64;break; case 128: tmp = SPI_BaudRatePrescaler_128;break; case 256: tmp = SPI_BaudRatePrescaler_256;break; default: break ; } SPI_InitStructure.SPI_BaudRatePrescaler=tmp; //波特率预分频值 SPI_Init(SPI1, &SPI_InitStructure); SPI_Cmd(SPI1, ENABLE); } uint32_t buf2[512];//SD卡数据缓存区 DMA_Tx_Init( DMA1_Channel3, (u32)&SPI1->DR, (u32)buf2, 512 );

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