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本帖最后由 hyarcher25 于 2020-1-2 09:01 编辑
环境:STM32F407VET 配置:DMA2_Stream0为SPI1_RX DMA2_Stream5为SPI1_TX
目的:与AD7327芯片(AD转换)配合,通过SPI1读取到外部模拟量值。
情况:
不使用DMA,读取正确 其工作方式如下:SPI初始化并完成AD7327芯片寄存器配置后,每次发送前,拉高片选,发送0x0000后,等待返回16位的采集值,拉低片选。再拉高,再发0x0000......
使用DMA,且使能发送和接收中断,其余函数均不涉及数据操作。读取数据只有ADValue_Original[0][0]才有值,其余均为零。怀疑是中断服务函数写得不正确,先请教下,自己也看看手册继续一边研究
#include "spi.h"
#include "AD7327.h"
//////////////////////////////////////////////////////////////////////////////////
extern volatile uint16_t ADValue_Original[N][M];//接收AD数据的数组
uint16_t readCmd[1] = {0x0000};//读取命令
void DMA_Config(void)
{
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
/////TX///////////////////////////////////////////////////////////////////////////////////
/* DMA disable*/
DMA_Cmd(DMA2_Stream5, DISABLE);
DMA_DeInit(DMA2_Stream5);
while (DMA_GetCmdStatus(DMA2_Stream5) != DISABLE){}
//SPI1 TX DMA Stream5
DMA_InitStructure.DMA_Channel = DMA_Channel_3;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&SPI1->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)readCmd;//读取命令
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;//内存到外设
DMA_InitStructure.DMA_BufferSize = 1;//DataSize;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //PSIZE=16bit
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //MSIZE=16bit
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//循环读取
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium ; //中等优先级
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream5, &DMA_InitStructure);
DMA_ITConfig(DMA2_Stream5, DMA_IT_TC, ENABLE);
//DMA2_Stream5 NVIC
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=5;
NVIC_InitStructure.NVIC_IRQChannelSubPriority =0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//SPI1 RX DMA Stream0
DMA_Cmd(DMA2_Stream0, DISABLE);
DMA_DeInit(DMA2_Stream0);
while (DMA_GetCmdStatus(DMA2_Stream0) != DISABLE){}
DMA_InitStructure.DMA_Channel = DMA_Channel_3;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&SPI1->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)ADValue_Original; //接收AD数据的缓存数组
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //外设到内存
DMA_InitStructure.DMA_BufferSize = N*M;//DataSize;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址自增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //PSIZE=16bit
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //MSIZE=16bit
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //循环接收AD数据
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //高优先级
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream0, &DMA_InitStructure);
DMA_ITConfig(DMA2_Stream0, DMA_IT_TC, ENABLE);
//DMA2_Stream0 NVIC
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=4;
NVIC_InitStructure.NVIC_IRQChannelSubPriority =0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);//使能发送
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE); //使能接收
/* DMA enable*/
DMA_Cmd(DMA2_Stream5, ENABLE);
DMA_Cmd(DMA2_Stream0, ENABLE);
}
//////////////////////////////////////////////////////////////////////////////////
//SPI初始化
void SPI1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
GPIO_PinAFConfig(GPIOA , GPIO_PinSource5, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA , GPIO_PinSource6, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOA , GPIO_PinSource7, GPIO_AF_SPI1);
//GPIOA 5 6 7
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;//PA5 6 7
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1,DISABLE);
//SPI_I2S_DeInit(SPI1);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b; //16位数据
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
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_Cmd(SPI1, ENABLE);
}
//接收中断
void DMA2_Stream0_IRQHandler(void)
{
// DMA_Cmd(DMA2_Stream0, ENABLE);
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE);
while (DMA_GetFlagStatus(DMA2_Stream0,DMA_FLAG_TCIF0)==RESET); //等待DMA处理完成标志位
DMA_ClearFlag(DMA2_Stream0,DMA_FLAG_TCIF0);
DMA_ClearITPendingBit(DMA2_Stream0,DMA_IT_TC);
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, DISABLE);
// DMA_Cmd(DMA2_Stream0, DISABLE);
AD_CS_HIGH;//拉高片选
}
//发送中断
void DMA2_Stream5_IRQHandler(void)
{
AD_CS_LOW;//拉低片选,开始AD转换
// DMA_Cmd(DMA2_Stream5, ENABLE);
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);
while (DMA_GetFlagStatus(DMA2_Stream5,DMA_FLAG_TCIF5)==RESET); //等待DMA处理完成标志位
DMA_ClearFlag(DMA2_Stream5,DMA_FLAG_TCIF5);
DMA_ClearITPendingBit(DMA2_Stream5,DMA_IT_TC);
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, DISABLE);
// DMA_Cmd(DMA2_Stream5, DISABLE);
}
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