我使用MM32SPIN27PF 使用dma与硬件spi进行开发 初始化代码如下： RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); //SPI2 clk enable
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
//SPI_NSS
GPIO_PinAFConfig(GPIOA, GPIO_PinSource4, GPIO_AF_0);
//SPI_SCK
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_0);
//SPI_MISO
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_0);
//SPI_MOSI
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_0);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_DataWidth = SPI_DataWidth_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_NSS = SPI_NSS_Hard;
SPI_InitStructure.SPI_BaudRatePrescaler = spi_baud_div;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;
SPI_Init(SPIx, &SPI_InitStructure);
SPI_Cmd(SPIx, ENABLE);
SPIM_TXEn(SPIx);
SPIM_RXEn(SPIx);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //ʹÄÜDMA´«Êä
//spi1 rx channel 2
DMA_DeInit(DMA1_Channel2); //½«DMAµÄͨµÀ2¼Ä´æÆ÷ÖØÉèΪȱʡֵ
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) & (SPI1->RXREG); //DMAÍâÉèADC»ùµØÖ·
DMA_InitStructure.DMA_MemoryBaseAddr = rx; //DMAÄÚ´æ»ùµØÖ·
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC ; //Êý¾Ý´«Êä·½Ïò£¬´ÓÄÚ´æ¶ÁÈ¡·¢Ë͵½ÍâÉè
DMA_InitStructure.DMA_BufferSize = rxbuffSize; //DMAͨµÀµÄDMA»º´æµÄ´óС
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //ÍâÉèµØÖ·¼Ä´æÆ÷²»±ä
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //ÄÚ´æµØÖ·¼Ä´æÆ÷µÝÔö
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; //Êý¾Ý¿í¶ÈΪ8λDMA_PeripheralDataSize_Byte
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word; //Êý¾Ý¿í¶ÈΪ8λDMA_MemoryDataSize_Byte
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //¹¤×÷ÔÚÕý³£»º´æģʽ
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh; //DMAͨµÀ xÓµÓÐÖÐÓÅÏȼ¶
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //DMAͨµÀxûÓÐÉèÖÃΪÄÚ´æµ½ÄÚ´æ´«Êä
DMA_Init(DMA1_Channel2, &DMA_InitStructure); //¸ù¾ÝDMA_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯DMAµÄͨµÀUSART1_Tx_DMA_ChannelËù±êʶµÄ¼Ä´æÆ÷
//spi1 tx channel 3
DMA_DeInit(DMA1_Channel3); //spi1 tx channel 3
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) & (SPI1->TXREG); //UART2_DMA_TX????J???
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)tx;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//?????memory??????
DMA_InitStructure.DMA_BufferSize = txbuffSize;//SPI1_DMA_TX???????
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel3, &DMA_InitStructure);//SPI1 tX?DMA???3
SPI_DMACmd(SPI1,SPI_DMAReq_EN,ENABLE);
请问有人遇到过这种情况吗？ 请问这是芯片设计导致的正常情况吗？
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