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最后登录1970-1-1
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注册时间2013-7-16
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我使用STM32F205 做SPI DMA 发送数据,总是发送不成功,请大家帮我看看是哪里出问题了,谢谢 !
- GPIO_InitTypeDef GPIO_InitStructure;
- SPI_InitTypeDef SPI_InitStructure;
- DMA_InitTypeDef DMA_InitStructure;
- //int ii =0;
- /*!< Enable SPI2 clocks */
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
- /*!< Enable GPIO clocks */
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
- /*!< Connect SPI pins to AF5 */
- GPIO_PinAFConfig(GPIOB, GPIO_PinSource13,GPIO_AF_SPI2);
- GPIO_PinAFConfig(GPIOB, GPIO_PinSource14,GPIO_AF_SPI2);
- GPIO_PinAFConfig(GPIOB, GPIO_PinSource15,GPIO_AF_SPI2);
- 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_DOWN;
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
- GPIO_Init(GPIOB, &GPIO_InitStructure);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//GPIO_PuPd_NOPULL;
- GPIO_Init(GPIOB, &GPIO_InitStructure);
- //Cdfinger_BspCs_HIGH();
- //Cdfinger_Bspdelay_ms(1);
- Cdfinger_BspCs_LOW();
- 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_4;
- SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
- SPI_InitStructure.SPI_CRCPolynomial = 7;
- SPI_Init(SPI2, &SPI_InitStructure);
- SPI_Cmd(SPI2, ENABLE);
- /* DMA1 Stream0 channel4 spi tx configuration **************************************/
- DMA_DeInit(DMA1_Stream4);
- DMA_InitStructure.DMA_Channel = DMA_Channel_0;
- DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(SPI2->DR);
- DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&cdfingerimgtxbuf[0];
- DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
- DMA_InitStructure.DMA_BufferSize = 28*1024;
- 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_Medium;//DMA_Priority_High;
- DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;//DMA_FIFOMode_Enable;
- DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
- DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
- DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
- DMA_Init(DMA1_Stream4, &DMA_InitStructure);
- memset(cdfingerimgtxbuf,0x33,28*1024);
- SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, ENABLE);
- DMA_Cmd(DMA1_Stream4, ENABLE);
- while(SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_TXE)==RESET);
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