本帖最后由 ihafd 于 2020-11-9 17:50 编辑
弄了两天，实在搞不掂。
如下配置 SPI2 DMA1 ＣＨ５ 发送16位的数居。
比如我发 ０xA0F5 它就是发了: 0x00F5 和0x00A0
为什么啊？？
void SPI2_DMA_init(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;//DMA初始化结构体
NVIC_InitTypeDef NVIC_InitStructure;//NVIC初始化结构体
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB , ENABLE );
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOE , ENABLE );
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOD , ENABLE );
RCC_APB1PeriphClockCmd( RCC_APB1Periph_SPI2, ENABLE );
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);//使能DMA1时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //SPI2 CLK
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //SPI2 MISO
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //SPI2 MOSI
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //SPI2 CS
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);
PBout(12) = 0;
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_16b; //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; //选择了串行时钟的稳态:时钟悬空高
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //数据捕获于第二个时钟沿
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_NSS_ Hard
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16; //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 = 1; //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
DMA_DeInit(DMA1_Channel5);
DMA_InitStructure.DMA_PeripheralBaseAddr = L3GD20_SPI_RDR;//(u32)&SPI2->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SPI2_DMA_DAC_TABLE;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = SPI2_DMA_DAC_LEN;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//DMA_MemoryInc_Enable
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //DMA_PeripheralDataSize_ HalfWord
DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord;//DMA_MemoryDataSize_ Byte
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel5, &DMA_InitStructure);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE); //使能DMA1通道5中断，注意一定要是
SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, ENABLE);//使能SPI2 DMA发送功能
SPI_Cmd(SPI2, ENABLE); //使能SPI外设
DMA_Cmd(DMA1_Channel5,ENABLE);//使能SPI2 DMA发送通道
// SPI2_ABI_Read_Write(0xff);//启动传输
}
/*********************************************SPI2 DMA中断*******************************/
void DMA1_Channel5_IRQHandler(void)
{
if(DMA_GetITStatus(DMA1_IT_TC5)==SET)
{
DMA_Cmd(DMA1_Channel5,DISABLE);
PEout(0) = 1;
PBout(12) = 0;
DMA_SetCurrDataCounter(DMA1_Channel5,SPI2_DMA_DAC_LEN); //恢复DMA指针，等待下一次的接收
GPIO_WriteBit(GPIOA, GPIO_Pin_5, (BitAction)(1-(GPIO_ReadOutputDataBit(GPIOA, GPIO_Pin_5)))); //PCB板上标TP1
PEout(0) = 0;
PBout(12) = 1;
// DMA_Cmd(DMA1_Channel5,ENABLE);
DMA_ClearITPendingBit(DMA1_IT_TC5);
}
}
真的试了无数次了。为什么啊！
感激帮忙！
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