请教一个SPI-DMA的问题

2020-11-12 04:40:18 1.1万阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

SPI异步传输使用DMA 问题点只配置SPI_RX SPI_PT SPI_ERR DMA_RX中断。当发送得数据长度=1时，数据能正常发送并出发PT中断。但是当发送得数据长度>1时，发送完第一个字节后数据不能正常发送，获取SPI状态，一直处于PENDING状态，PT中断不能正常触发，DMA_RX中断也不能正常触发。阅读详情

应用：
STM32F407、SPI做从机接收数据、采用DMA接收，预期接收到512个数据时产生一个DMA中断，进行数据处理，以下是我的代码，进不了中断，不知道为什么？？？求解答：
将中断改为SPI1_IRQn时可以进中断，但是数据不对，得到的是一个16位的固定置！
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

SPI_Cmd(FPGA_SPI, DISABLE);
SPI_DeInit(FPGA_SPI);

RCC_AHB1PeriphClockCmd (FPGA_SPI_SCK_GPIO_CLK | FPGA_SPI_MISO_GPIO_CLK | FPGA_SPI_MOSI_GPIO_CLK | FPGA_CS_GPIO_CLK, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_DMA2, ENABLE);

GPIO_PinAFConfig(FPGA_SPI_SCK_GPIO_PORT,FPGA_SPI_SCK_PINSOURCE,FPGA_SPI_SCK_AF);
GPIO_PinAFConfig(FPGA_SPI_MISO_GPIO_PORT,FPGA_SPI_MISO_PINSOURCE,FPGA_SPI_MISO_AF);
GPIO_PinAFConfig(FPGA_SPI_MOSI_GPIO_PORT,FPGA_SPI_MOSI_PINSOURCE,FPGA_SPI_MOSI_AF);

GPIO_InitStructure.GPIO_Pin = FPGA_SPI_SCK_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(FPGA_SPI_SCK_GPIO_PORT, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = FPGA_SPI_MISO_PIN;
GPIO_Init(FPGA_SPI_MISO_GPIO_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = FPGA_SPI_MOSI_PIN;
GPIO_Init(FPGA_SPI_MOSI_GPIO_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = FPGA_CS_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_Init(FPGA_CS_GPIO_PORT, &GPIO_InitStructure);

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_NSS = SPI_NSS_Hard;//SPI_NSS_Soft;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(FPGA_SPI, &SPI_InitStructure);

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream2_IRQn;//SPI1_IRQn
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

SPI_DMACmd(FPGA_SPI,SPI_DMAReq_Rx,ENABLE);
SPI_Cmd(FPGA_SPI, ENABLE);

while (DMA_GetCmdStatus(SPI_DMA_STREAM) != DISABLE){}
DMA_DeInit(SPI_DMA_STREAM);
DMA_InitStructure.DMA_Channel = SPI_DMA_CHANNEL;
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&FPGA_SPI->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (u32)spi_rv_buf;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = SPI_RV_SIZE;
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_High;

DMA_Init(SPI_DMA_STREAM, &DMA_InitStructure);

DMA_ITConfig(SPI_DMA_STREAM, DMA_IT_TC, ENABLE);
DMA_Cmd(SPI_DMA_STREAM, ENABLE);

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