【求助】SPI+DMA数据提前一个时钟周期发送
频率在256分频到64分频就出现这种情况，MISO第一位数据在上一时钟周期就发送出去，
32分频到2分频，没有这种情况出现，
是哪里出问题？
顶一下。 厉害了我的哥，还用上逻辑分析仪了:lol 顶一下，没有没人遇到类似的情况，
或者有什么可能，提下意见吧 具体哪个STM32系列的芯片？ 工作在什么模式？
查查相关芯片系列的勘误手册，看有无相关描述。 xmshao 发表于 2017-2-14 10:18
具体哪个STM32系列的芯片？ 工作在什么模式？
查查相关芯片系列的勘误手册，看有无相关描述。 ...
f407ve
看过勘误手册没有相关的
而且这种情况只在低频率出现
1453111536 发表于 2017-2-14 11:32
f407ve
看过勘误手册没有相关的
而且这种情况只在低频率出现
哦 它工作在什么哪个模式？主模式？从模式？ 什么样的配置？ xmshao 发表于 2017-2-16 14:34
哦 它工作在什么哪个模式？主模式？从模式？ 什么样的配置？
从模式
<blockquote>void DMA2_Stream0_IRQHandler(void)
1453111536 发表于 2017-2-17 09:56
从模式
void DMA2_Stream0_IRQHandler(void)
{
if(DMA_GetITStatus(DMA2_Stream0,DMA_IT_TCIF0)==SET)
{
DMA_Cmd(DMA2_Stream0,DISABLE);
DMA_ClearITPendingBit(DMA2_Stream0,DMA_IT_TCIF0);
DMA_Cmd(DMA2_Stream5, ENABLE);
}
}
void DMA2_Stream5_IRQHandler(void)
{
if(DMA_GetITStatus(DMA2_Stream5,DMA_IT_TCIF5)==SET)
{
DMA_Cmd(DMA2_Stream5,DISABLE);
DMA_ClearITPendingBit(DMA2_Stream5,DMA_IT_TCIF5);
}
}
void EXTI15_10_IRQHandler(void )
{
if(EXTI_GetITStatus(EXTI_Line15) != RESET)
{
if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_15) == Bit_RESET)
{
DMA_Cmd(DMA2_Stream0, ENABLE);
}
if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_15) == Bit_SET)
{
DMA_Cmd(DMA2_Stream5, DISABLE);
DMA_Cmd(DMA2_Stream0, DISABLE);
}
EXTI_ClearITPendingBit(EXTI_Line15);
}
}
void SPISCfgPort(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
RCC_AHB1PeriphClockCmd (RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 |RCC_APB2Periph_SYSCFG, ENABLE);
RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_DMA2 , ENABLE);
//复用
GPIO_PinAFConfig(GPIOB,GPIO_PinSource3,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource4,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource5,GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource15,GPIO_AF_SPI1);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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_UP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//EXIT
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, GPIO_PinSource15);
EXTI_ClearITPendingBit(EXTI_Line15);
EXTI_InitStructure.EXTI_Line = EXTI_Line15;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
//NVIC
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//DMA
DMA_DeInit(DMA2_Stream0);
DMA_DeInit(DMA2_Stream5);
DMA_InitStructure.DMA_Channel= DMA_Channel_3;
DMA_InitStructure.DMA_BufferSize = MAX_BUFF_LEN;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
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_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_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Buff.BuffTx;
DMA_Init(DMA2_Stream5, &DMA_InitStructure);
DMA_ITConfig(DMA2_Stream5,DMA_IT_TC,ENABLE);
/* Configure RX DMA */
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory ;
DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)Buff.BuffRx;
DMA_Init(DMA2_Stream0,&DMA_InitStructure);
DMA_ITConfig(DMA2_Stream0,DMA_IT_TC,ENABLE);
//SPI1设置
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_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE);
SPI_Cmd(SPI1, ENABLE);
DMA_Cmd(DMA2_Stream5, DISABLE);
DMA_Cmd(DMA2_Stream0, DISABLE);
}
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