[问答]

STM32F410R8 SPI DMA不读是为什么？怎么解决？

211 SPI

问答对人有帮助，内容完整，我也想知道答案 0 我已将 SPI 配置为使用 DMA。微控制器正在发送但未读取。我已经检查了配置，但看不出问题所在。你能在我的代码中看到一些奇怪的东西吗？我已经在 STM32F429-DISCO 板上测试了这段代码并且可以正常工作。这是外设定义。 #define SPI_BCC SPI1 #define SPI_BCC_CLK RCC_APB2Periph_SPI1 #define SPI_BCC_CLK_EN RCC_APB2PeriphClockCmd(SPI_BCC_CLK, ENABLE) #define SPI_BCC_SCK_PIN GPIO_Pin_3 #define SPI_BCC_SCK_GPIO_PORT GPIOB #define SPI_BCC_SCK_GPIO_CLK RCC_AHB1Periph_GPIOB #define SPI_BCC_SCK_SOURCE GPIO_PinSource3 #define SPI_BCC_SCK_AF GPIO_AF_SPI1 #define SPI_BCC_MISO_PIN GPIO_Pin_4 #define SPI_BCC_MISO_GPIO_PORT GPIOB #define SPI_BCC_MISO_GPIO_CLK RCC_AHB1Periph_GPIOB #define SPI_BCC_MISO_SOURCE GPIO_PinSource4 #define SPI_BCC_MISO_AF GPIO_AF_SPI1 #define SPI_BCC_MOSI_PIN GPIO_Pin_5 #define SPI_BCC_MOSI_GPIO_PORT GPIOB #define SPI_BCC_MOSI_GPIO_CLK RCC_AHB1Periph_GPIOB #define SPI_BCC_MOSI_SOURCE GPIO_PinSource5 #define SPI_BCC_MOSI_AF GPIO_AF_SPI1 #define SPI_BCC_CS1_PIN GPIO_Pin_11 #define SPI_BCC_CS1_GPIO_PORT GPIOB #define SPI_BCC_CS1_GPIO_CLK RCC_AHB1Periph_GPIOB #define SPI_BCC_CS2_PIN GPIO_Pin_12 #define SPI_BCC_CS2_GPIO_PORT GPIOC #define SPI_BCC_CS2_GPIO_CLK RCC_AHB1Periph_GPIOC #define SPI_BCC_CS3_PIN GPIO_Pin_11 #define SPI_BCC_CS3_GPIO_PORT GPIOC #define SPI_BCC_CS3_GPIO_CLK RCC_AHB1Periph_GPIOC #define SPI_BCC_CS4_PIN GPIO_Pin_10 #define SPI_BCC_CS4_GPIO_PORT GPIOC #define SPI_BCC_CS4_GPIO_CLK RCC_AHB1Periph_GPIOC #define SPI_BCC_CS5_PIN GPIO_Pin_15 #define SPI_BCC_CS5_GPIO_PORT GPIOA #define SPI_BCC_CS5_GPIO_CLK RCC_AHB1Periph_GPIOA #define SPI_BCC_CS6_PIN GPIO_Pin_15 #define SPI_BCC_CS6_GPIO_PORT GPIOA #define SPI_BCC_CS6_GPIO_CLK RCC_AHB1Periph_GPIOA #define DMA_BUFFER_SIZE 6 #define SPI1_DMA DMA2 #define SPI1_DMA_CLK RCC_AHB1Periph_DMA2 #define SPI1_TX_DMA_CHANNEL DMA_Channel_3 #define SPI1_TX_DMA_STREAM DMA2_Stream3 #define SPI1_TX_DMA_FLAG_TCIF DMA_FLAG_TCIF3 #define SPI1_RX_DMA_CHANNEL DMA_Channel_3 #define SPI1_RX_DMA_STREAM DMA2_Stream2 #define SPI1_RX_DMA_FLAG_TCIF DMA_FLAG_TCIF3 这是配置： static void SPI_BCC_Config(void) { /* Structure definition / GPIO_InitTypeDef GPIO_InitStructure; SPI_InitTypeDef SPI_InitStructure; DMA_InitTypeDef DMA_InitStructure; / Peripheral Clock Enable -------------------------------------------------/ / Enable the SPI clock / RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); / Enable GPIO clocks / RCC_AHB1PeriphClockCmd(SPI_BCC_SCK_GPIO_CLK \| SPI_BCC_MISO_GPIO_CLK \| SPI_BCC_MOSI_GPIO_CLK, ENABLE); / Enable DMA clock / RCC_AHB1PeriphClockCmd(SPI1_DMA_CLK, ENABLE); / SPI GPIO Configuration --------------------------------------------------/ / GPIO Deinitialisation / GPIO_DeInit(SPI_BCC_SCK_GPIO_PORT); GPIO_DeInit(SPI_BCC_MISO_GPIO_PORT); GPIO_DeInit(SPI_BCC_MOSI_GPIO_PORT); / Connect SPI pins to AF1 / GPIO_PinAFConfig(SPI_BCC_SCK_GPIO_PORT, SPI_BCC_SCK_SOURCE, SPI_BCC_SCK_AF); GPIO_PinAFConfig(SPI_BCC_MISO_GPIO_PORT, SPI_BCC_MISO_SOURCE, SPI_BCC_MISO_AF); GPIO_PinAFConfig(SPI_BCC_MOSI_GPIO_PORT, SPI_BCC_MOSI_SOURCE, SPI_BCC_MOSI_AF); GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; / SPI SCK pin configuration / GPIO_InitStructure.GPIO_Pin = SPI_BCC_SCK_PIN; GPIO_Init(SPI_BCC_SCK_GPIO_PORT, &GPIO_InitStructure); / SPI MOSI pin configuration / GPIO_InitStructure.GPIO_Pin = SPI_BCC_MOSI_PIN; GPIO_Init(SPI_BCC_MOSI_GPIO_PORT, &GPIO_InitStructure); / SPI MISO pin configuration / //GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //GPIO_InitStructure.GPIO_OType = GPIO_OType_OD; GPIO_InitStructure.GPIO_Pin = SPI_BCC_MISO_PIN; GPIO_Init(SPI_BCC_MISO_GPIO_PORT, &GPIO_InitStructure); / SPI configuration -------------------------------------------------------/ SPI_I2S_DeInit(SPI_BCC); SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128; SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; SPI_InitStructure.SPI_Mode = SPI_Mode_Master; SPI_InitStructure.SPI_CRCPolynomial = 7; / Initializes the SPI configuration / SPI_Init(SPI_BCC, &SPI_InitStructure); / DMA configuration -------------------------------------------------------/ / Deinitialize DMA Streams / DMA_DeInit(SPI1_TX_DMA_STREAM); DMA_DeInit(SPI1_RX_DMA_STREAM); / Configure DMA Initialization Structure / DMA_InitStructure.DMA_BufferSize = DMA_BUFFER_SIZE ; DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable ; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull ; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single ; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; DMA_InitStructure.DMA_PeripheralBaseAddr =(uint32_t) (&(SPI1->DR)) ; DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_Priority = DMA_Priority_High; / Configure TX DMA / DMA_InitStructure.DMA_Channel = SPI1_TX_DMA_CHANNEL ; DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral ; DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)DMA_SPIBufferTx ; DMA_Init(SPI1_TX_DMA_STREAM, &DMA_InitStructure); / Configure RX DMA / DMA_InitStructure.DMA_Channel = SPI1_RX_DMA_CHANNEL ; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory ; DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)DMA_SPIBufferRx ; DMA_Init(SPI1_RX_DMA_STREAM, &DMA_InitStructure); / Enable the SPI peripheral / SPI_Cmd(SPI_BCC, ENABLE); } 这就是处理传输和接收的： bcc_status_t BCC_MCU_TransferSpi(uint8_t dev, uint8_t transBuf[], uint8_t recvBuf[]) { /Copy Frame to buffer/ for (SPI_Buf_idx = 0; SPI_Buf_idx < DMA_BUFFER_SIZE; SPI_Buf_idx++) { DMA_SPIBufferTx[SPI_Buf_idx] = transBuf[SPI_Buf_idx]; } /Set Chip select to LOW level/ BCC_MCU_WriteCsbPin(dev, 0); /Enable DMA transfer/ DMA_Cmd(SPI1_TX_DMA_STREAM, ENABLE); DMA_Cmd(SPI1_RX_DMA_STREAM, ENABLE); / Enable SPI DMA TX Request / SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE); / Enable SPI DMA RX Request / SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE); / Waiting the end of Data transfer / while (SPI1_TX_DMA_STREAM->NDTR==RESET)DONOTHING() while(SPI_GetFlagStatus(SPI_BCC,SPI_FLAG_BSY)== SET)DONOTHING() / Clear DMA Transfer Complete Flags / DMA_ClearFlag(SPI1_TX_DMA_STREAM,SPI1_TX_DMA_FLAG_TCIF); DMA_ClearFlag(SPI1_RX_DMA_STREAM,SPI1_RX_DMA_FLAG_TCIF); / Disable DMA SPI TX Stream / DMA_Cmd(SPI1_TX_DMA_STREAM,DISABLE); / Disable DMA SPI RX Stream / DMA_Cmd(SPI1_RX_DMA_STREAM,DISABLE); / Disable SPI DMA TX Requsts / SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, DISABLE); / Disable SPI DMA RX Requsts / SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, DISABLE); /Set Chip select to HIGH level/ BCC_MCU_WriteCsbPin(dev, 1); //Flush_RxBuffer(); / Store received data to recvBuf. */ for (SPI_Buf_idx = 0; SPI_Buf_idx < DMA_BUFFER_SIZE; SPI_Buf_idx++) { recvBuf[SPI_Buf_idx]= DMA_SPIBufferRx[SPI_Buf_idx]; //printf("0x%x ",DMA_SPIBufferRx[SPI_Buf_idx]); } //printf("nr"); return BCC_STATUS_SUCCESS; } 我看不出问题是什么。我怀疑这些旗帜，但我看不出有什么问题。 0
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