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如题，代码如下：其中ICM40609_REG_TEMP_DATA0 = 30，本意是想读取某IMU芯片温度寄存器中的数据，普通SPI读法为先写入SPI2_ReadWriteByte(ICM40609_REG_TEMP_DATA0);，然后再读取temp = SPI2_ReadWriteByte(0xff);返回值temp即为8位原始温度数据，但是加入DMA后读取ReceiveBuf[0]中的数值始终为0，求解答
#define SendBufSize 1
#define ReceiveBufSize 1
u8 SendBuf[SendBufSize] = {ICM40609_REG_TEMP_DATA0};
u8 ReceiveBuf[ReceiveBufSize];
u8 SPI2_ReadWriteByte(u8 TxData)
{
while(SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_TXE) == RESET){
//等待发送区空
}
SPI_I2S_SendData(SPI2,TxData); //发送一个字节
while(SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_RXNE) == RESET){
//等待接收完成一个字节
}
return
SPI_I2S_ReceiveData(SPI2); //返回接收到的字节
}
void SPI2_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE); //使能GPIOB时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE); //使能SPI2时钟
//SPI通信I/O口初始化设置
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10|GPIO_Pin_14|GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//50MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
GPIO_Init(GPIOB,&GPIO_InitStructure);//初始化
GPIO_PinAFConfig(GPIOB,GPIO_PinSource10,GPIO_AF_SPI2); //PB10复用为 SPI2
GPIO_PinAFConfig(GPIOB,GPIO_PinSource14,GPIO_AF_SPI2); //PB14复用为 SPI2
GPIO_PinAFConfig(GPIOB,GPIO_PinSource15,GPIO_AF_SPI2); //PB15复用为 SPI2
//这里只针对SPI口初始化
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2,ENABLE);//复位SPI2
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2,DISABLE);//停止复位SPI2
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //设置SPI单向或者双向的数据模式:SPI设置为双线双向全双工
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置SPI工作模式:设置为主SPI
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //设置SPI的数据大小:SPI发送接收8位帧结构
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; //串行同步时钟的空闲状态
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; //第一个跳变沿（上升或下降）数据被采样
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS信号由硬件（NSS管脚）还是软件（使用SSI位）管理:内部NSS信号有SSI位控制
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //定义波特率预分频的值:波特率预分频值为256
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //指定数据传输从MSB位还是LSB位开始:数据传输从MSB位开始
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC值计算的多项式
SPI_Init(SPI2,&SPI_InitStructure); //根据SPI_InitStruct中指定的参数初始化外设SPIx寄存器
SPI_Cmd(SPI2,ENABLE);
SPI2_DMA_Init((u32)SendBuf,SendBufSize,(u32)ReceiveBuf,ReceiveBufSize);
}
void SPI2_DMA_Init(u32 sendMar,u16 sendNdtr,u32 receiveMar,u16 receiveNdtr)
{
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
/* Tx */
DMA_Cmd(DMA1_Stream4,DISABLE);
DMA_DeInit(DMA1_Stream4);
while(DMA_GetCmdStatus(DMA1_Stream4) != DISABLE);
DMA_InitStructure.DMA_Channel = DMA_Channel_0; //选择DMA通道
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&SPI2->DR; //外设地址
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)sendMar; //存储器0地址
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; //内存到外部设备
DMA_InitStructure.DMA_BufferSize = sendNdtr; //传输数据长度
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址不自增
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址自增
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //内存数据为8位
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据为8位
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //不采取循环模式
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //优先级为中等
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //不采取FIFO模式
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full; //不采取FIFO模式，该参数无关紧要
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //单次传输
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //单次传输
DMA_Init(DMA1_Stream4,&DMA_InitStructure);
DMA_ITConfig(DMA1_Stream4,DMA_IT_TC,ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Rx */
DMA_Cmd(DMA1_Stream3,DISABLE);
DMA_DeInit(DMA1_Stream3);
while(DMA_GetCmdStatus(DMA1_Stream3) != DISABLE);
DMA_InitStructure.DMA_Channel = DMA_Channel_0; //选择DMA通道
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&SPI2->DR; //外设地址
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)receiveMar; //存储器0地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //外部设备到内存
DMA_InitStructure.DMA_BufferSize = receiveNdtr; //传输数据长度
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址不自增
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址自增
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //内存数据为8位
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据为8位
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //不采取循环模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //优先级为高等
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //不采取FIFO模式
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full; //不采取FIFO模式，该参数无关紧要
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //单次传输
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //单次传输
DMA_Init(DMA1_Stream3,&DMA_InitStructure);
DMA_ITConfig(DMA1_Stream3,DMA_IT_TC,ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
SPI_I2S_DMACmd(SPI2,SPI_I2S_DMAReq_Tx,ENABLE);
SPI_I2S_DMACmd(SPI2,SPI_I2S_DMAReq_Rx,ENABLE);
DMA_Cmd(DMA1_Stream4,ENABLE);
DMA_Cmd(DMA1_Stream3,ENABLE);
}
void DMA1_Stream4_IRQHandler(void)
{
SPI_I2S_DMACmd(SPI2,SPI_I2S_DMAReq_Tx,ENABLE);
while(DMA_GetFlagStatus(DMA1_Stream4,DMA_FLAG_TCIF4) == RESET);
DMA_ClearFlag(DMA1_Stream4,DMA_FLAG_TCIF4);
DMA_ClearITPendingBit(DMA1_Stream4,DMA_IT_TCIF4);
SPI_I2S_DMACmd(SPI2,SPI_I2S_DMAReq_Tx,DISABLE);
}
void DMA1_Stream3_IRQHandler(void)
{
SPI_I2S_DMACmd(SPI2,SPI_I2S_DMAReq_Rx,ENABLE);
while(DMA_GetFlagStatus(DMA1_Stream3,DMA_FLAG_TCIF3) == RESET);
DMA_ClearFlag(DMA1_Stream3,DMA_FLAG_TCIF3);
DMA_ClearITPendingBit(DMA1_Stream3,DMA_IT_TCIF3);
SPI_I2S_DMACmd(SPI2,SPI_I2S_DMAReq_Rx,DISABLE);
}
void main()
{
while(1)
printf("%d\r\n",ReceiveBuf[0]);
} |
最佳答案
查看完整内容[请看2#楼]
看你的代码 DMA流结束后，正常进入了传输完成中断。中断服务中，应该是重新开始启动DMA流控。你是重新开启了DMA请求。
void DMA1_Stream4_IRQHandler(void)
{
if(DMA_GetFlagStatus(DMA1_Stream4,DMA_FLAG_TCIF4) != RESET)
{
DMA_ClearFlag(DMA1_Stream4,DMA_FLAG_TCIF4);
DMA_ClearITPendingBit(DMA1_Stream4,DMA_IT_TCIF4);
DMA_Cmd(DMA1_Stream4,ENABLE);
}
}
void DMA1_Stream3_IRQHandler(void)
...
|
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发表于 2021-4-9 17:07:47
发表于 2021-4-10 01:44:12
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