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发表于 2016-1-21 15:24:45
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本帖最后由 cornrn 于 2016-1-21 15:27 编辑
@fanghuiopenedv @DHG
见楼下程序 硬件IIC+DMA方式读取MPU6050
i2c_dma.c文件↓↓↓↓↓↓↓
/*
****************************************Copyright (c)**************************************************
** xxxxxxxxxxxxxxxxxxxxxxxxx
** cornrn
** QQ858860583
**------------------------------------------------------------------------------------------------------
********************************************************************************************************
*/
#include <i2c_dma.h>
typedef enum {FALSE = 0, TRUE = !FALSE} bool;
#define Transmitter 0x00
#define Receiver 0x01
static __IO uint8_t MasterDirection = Transmitter;
static uint16_t SlaveDevAddr; /* 从设备地址缓存 */
static uint8_t SlaveDevRegAddr; /* 从设备寄存器地址缓存 */
static bool check_begin = FALSE;
static bool OffsetDone = FALSE;
static __IO I2C_STATE i2c_state;
/*******************************************************************************************************
** 函数名称: I2C_MasterCommunication
** 功能描述: I2C主机通信，通过DMA方式,使用 I2C2,非重入
direction: 通信描述
I2C_Direction_Transmitter 主机发送
I2C_Direction_Receiver主
机接收
slave_addr: 器件地址
offset:偏移地址
buffer:数据缓存
length:数据字节数,必须大于1
** 返 回: 无
********************************************************************************************************/
void I2C_MasterCommunication(uint8_t direction,uint16_t slave_addr,uint8_t offset,uint8_t* buffer,uint32_t length)
{
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&I2C2->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)buffer;
DMA_InitStructure.DMA_BufferSize = length;
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_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
if(direction == I2C_Direction_Transmitter)
{
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_DeInit(DMA1_Channel4);
DMA_Init(DMA1_Channel4, &DMA_InitStructure);
DMA_ITConfig(DMA1_Channel4, DMA_IT_TC, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn;
MasterDirection = Transmitter;
}
else if(direction == I2C_Direction_Receiver)
{
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_DeInit(DMA1_Channel5);
DMA_Init(DMA1_Channel5, &DMA_InitStructure);
DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn;
MasterDirection = Receiver;
}
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
SlaveDevAddr = slave_addr;
SlaveDevRegAddr = offset;
OffsetDone = FALSE;
i2c_state = 1;
I2C_AcknowledgeConfig(I2C2,ENABLE);
I2C_ITConfig(I2C2, I2C_IT_EVT | I2C_IT_ERR ,ENABLE);
if(I2C2->CR1 & 0x200)I2C2->CR1 &= 0xFDFF;
I2C_GenerateSTART(I2C2,ENABLE);
while(i2c_state != FinishFlag);
}
/*******************************************************************************************************
** 函数名称: I2C2_EV_IRQHandler
** 功能描述: I2C事件中断处理函数
** 返 回: 无
********************************************************************************************************/
void I2C2_EV_IRQHandler(void)
{
switch (I2C_GetLastEvent(I2C2))
{
case I2C_EVENT_MASTER_MODE_SELECT: /* EV5 */
if(OffsetDone){
I2C_Send7bitAddress(I2C2,SlaveDevAddr,I2C_Direction_Receiver);
OffsetDone = FALSE;
}
else{
I2C_Send7bitAddress(I2C2,SlaveDevAddr,I2C_Direction_Transmitter);
}
I2C_ITConfig(I2C2,I2C_IT_BUF ,ENABLE);
break;
case I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED: /* EV6 */
I2C_ITConfig(I2C2, I2C_IT_EVT | I2C_IT_BUF,DISABLE);
I2C_DMALastTransferCmd(I2C2,ENABLE);
I2C_DMACmd(I2C2,ENABLE);
DMA_Cmd(DMA1_Channel5,ENABLE);
break;
case I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED: /* EV6 */
I2C_SendData(I2C2, SlaveDevRegAddr);
OffsetDone = TRUE;
break;
case I2C_EVENT_MASTER_BYTE_TRANSMITTING: /* EV8 */
if (MasterDirection == Receiver)
{
I2C_ITConfig(I2C2, I2C_IT_BUF ,DISABLE);
while ((I2C2->CR1 & 0x200) == 0x200);
I2C_GenerateSTART(I2C2, ENABLE);
}
else
{
I2C_ITConfig(I2C2, I2C_IT_EVT | I2C_IT_BUF,DISABLE);
I2C_DMACmd(I2C2,ENABLE);
DMA_Cmd(DMA1_Channel4,ENABLE);
}
break;
}
}
/*******************************************************************************************************
** 函数名称: DMA1_Channel4_IRQHandler
** 功能描述: DMA1 通道4中断服务入口
** 返 回: 无
********************************************************************************************************/
void DMA1_Channel4_IRQHandler(void)
{
if (DMA_GetFlagStatus(DMA1_FLAG_TC4))
{
I2C_DMACmd(I2C2,DISABLE);
DMA_Cmd(DMA1_Channel4,DISABLE);
I2C_DMALastTransferCmd(I2C2,DISABLE);
I2C_GenerateSTOP(I2C2,ENABLE);
i2c_state = FinishFlag;
DMA_ClearFlag(DMA1_FLAG_TC4);
}
}
/*******************************************************************************************************
** 函数名称: DMA1_Channel5_IRQHandler
** 功能描述: DMA1 通道5中断服务入口
** 返 回: 无
********************************************************************************************************/
void DMA1_Channel5_IRQHandler(void)
{
if(DMA_GetFlagStatus(DMA1_FLAG_TC5))
{
I2C_DMACmd(I2C2,DISABLE);
I2C_DMALastTransferCmd(I2C2,DISABLE);
I2C_GenerateSTOP(I2C2,ENABLE);
i2c_state = FinishFlag;
DMA_ClearFlag(DMA1_FLAG_TC5);
}
}
/*******************************************************************************************************
** 函数名称: I2C2_ER_IRQHandler
** 功能描述: I2C错误中断服务
** 返 回: 无
********************************************************************************************************/
void I2C2_ER_IRQHandler(void)
{
if(I2C_GetFlagStatus(I2C2,I2C_FLAG_AF))
{
if(check_begin)I2C_GenerateSTART(I2C2,ENABLE);
else if(I2C2->SR2 &0x01)
{
I2C_GenerateSTOP(I2C2, ENABLE);
i2c_state = ExitFlag;
}
I2C_ClearFlag(I2C2, I2C_FLAG_AF);
}
if(I2C_GetFlagStatus(I2C2,I2C_FLAG_BERR))
{
if(I2C2->SR2 &0x01)
{
I2C_GenerateSTOP(I2C2,ENABLE);
i2c_state = ExitFlag;
}
I2C_ClearFlag(I2C2, I2C_FLAG_BERR);
}
}
/****************************** (C) COPYRIGHT xxxx *****END OF FILE******************************/
i2c_dma.h文件↓↓↓↓↓↓↓
#ifndef __I2C_DMA_H
#define __I2C_DMA_H
/* Includes ------------------------------------------------------------------*/
#include <stm32l1xx.h>
#include <stdio.h>
/* Exported types ------------------------------------------------------------*/
typedef enum
{
FinishFlag = 0,
BeginFlag = (1<<1),
ProcessFlag = (1<<2),
ExitFlag = (1<<3),
OffestDoneFlag = (1<<4),
DirectionFlag = (1<<5),
}I2C_STATE;
void I2C_MasterCommunication(uint8_t direction,uint16_t slave_addr,uint8_t offset,uint8_t* buffer,uint32_t length);
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