1、接线图
SDA接在B11,SCL接在B10 ,软件IIC的两个引脚可以任意更改的,因为都是开漏输出,硬件接在哪个引脚上,程序中就对应操作哪个引脚
但是硬件IIC,通信引脚是不可以任意指定的,查表,由于PB6、PB7被OLED应用,所以用PB10、PB11,软件IIC的代码在此处也适用
2、软件IIC改为硬件IIC
第一步:开启I2C外设,对I2C2外设进行初始化,以替换MyI2C_Init
第二步:控制外设电路,实现指定地址写的时序,以替换WriteReg
第三步:控制外设电路,实现指定地址读的时序,以替换ReadReg
3、配置IIC外设初始化配置
第一步:开启IIC外设和对应GPIO口的时钟
第二步:把IIC外设和对应的GPIO口初始化为复用开漏模式
第三步:使用结构体,对整个IIC进行配置
第四步:I2C_Cmd,使能I2C
4、MPU6050.c代码
#include "stm32f10x.h" // Device header
#include "MPU6050_Reg.h"
#define MPU6050_ADDRESS 0xD0
void MPU6050_WaitEvent(I2C_TypeDef* I2Cx, uint32_t I2C_EVENT)
{
uint32_t Timeout;
Timeout = 10000;
while (I2C_CheckEvent(I2Cx, I2C_EVENT) != SUCCESS)
{
Timeout --;
if (Timeout == 0)
{
break;
}
}
}
void MPU6050_WriteReg(uint8_t RegAddress, uint8_t Data)
{
I2C_GenerateSTART(I2C2, ENABLE);//生成起始条件,实际是在操作CR1寄存器,置1,产生起始条件
MPU6050_WaitEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT);//等待EV5事件的到来
//发送从机地址,接收应答,直接向DR寄存器写入一个字节即可
I2C_Send7bitAddress(I2C2, MPU6050_ADDRESS, I2C_Direction_Transmitter);//I2C2、从机地址、发送(即最低地址清0)
MPU6050_WaitEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED);
I2C_SendData(I2C2, RegAddress);
MPU6050_WaitEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTING);//字节正在发送中
I2C_SendData(I2C2, Data);
MPU6050_WaitEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED);//字节已经发送完毕transmitted
I2C_GenerateSTOP(I2C2, ENABLE);//生成终止条件
}
uint8_t MPU6050_ReadReg(uint8_t RegAddress)
{
uint8_t Data;
I2C_GenerateSTART(I2C2, ENABLE);
MPU6050_WaitEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT);
I2C_Send7bitAddress(I2C2, MPU6050_ADDRESS, I2C_Direction_Transmitter);
MPU6050_WaitEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED);
I2C_SendData(I2C2, RegAddress);
MPU6050_WaitEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED);
I2C_GenerateSTART(I2C2, ENABLE);
MPU6050_WaitEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT);
I2C_Send7bitAddress(I2C2, MPU6050_ADDRESS, I2C_Direction_Receiver);
MPU6050_WaitEvent(I2C2, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED);
I2C_AcknowledgeConfig(I2C2, DISABLE);
I2C_GenerateSTOP(I2C2, ENABLE);
MPU6050_WaitEvent(I2C2, I2C_EVENT_MASTER_BYTE_RECEIVED);
Data = I2C_ReceiveData(I2C2);
I2C_AcknowledgeConfig(I2C2, ENABLE);
return Data;
}
void MPU6050_Init(void)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);//使能IIC
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);//使能GPIOB口
GPIO_InitTypeDef GPIO_InitStructure;//用结构体初始化
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD; //复用开漏模式
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
I2C_InitTypeDef I2C_InitStructure;
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_ClockSpeed = 50000;//50KHz,在0~100KHZ范围内,标准速度,100KHZ~400kHZ快速
//速度快的时候,低电平的时间需要多一些,因为低电平数据可能翻转,需要时间,高电平时,读取数据
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;//低电平时间和高电平时间是2:1
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;//配置ACK应答位,默认是给应答的
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;//stm32作为从机,可以响应多少位的地址
I2C_InitStructure.I2C_OwnAddress1 = 0x00;//stm32暂时不作为从机,可以随便给个地址,只要不跟别的主机冲突即可
I2C_Init(I2C2, &I2C_InitStructure);
I2C_Cmd(I2C2, ENABLE);
MPU6050_WriteReg(MPU6050_PWR_MGMT_1, 0x01);
MPU6050_WriteReg(MPU6050_PWR_MGMT_2, 0x00);
MPU6050_WriteReg(MPU6050_SMPLRT_DIV, 0x09);
MPU6050_WriteReg(MPU6050_CONFIG, 0x06);
MPU6050_WriteReg(MPU6050_GYRO_CONFIG, 0x18);
MPU6050_WriteReg(MPU6050_ACCEL_CONFIG, 0x18);
}
uint8_t MPU6050_GetID(void)
{
return MPU6050_ReadReg(MPU6050_WHO_AM_I);
}
void MPU6050_GetData(int16_t *AccX, int16_t *AccY, int16_t *AccZ,
int16_t *GyroX, int16_t *GyroY, int16_t *GyroZ)
{
uint8_t DataH, DataL;
DataH = MPU6050_ReadReg(MPU6050_ACCEL_XOUT_H);
DataL = MPU6050_ReadReg(MPU6050_ACCEL_XOUT_L);
*AccX = (DataH << 8) | DataL;
DataH = MPU6050_ReadReg(MPU6050_ACCEL_YOUT_H);
DataL = MPU6050_ReadReg(MPU6050_ACCEL_YOUT_L);
*AccY = (DataH << 8) | DataL;
DataH = MPU6050_ReadReg(MPU6050_ACCEL_ZOUT_H);
DataL = MPU6050_ReadReg(MPU6050_ACCEL_ZOUT_L);
*AccZ = (DataH << 8) | DataL;
DataH = MPU6050_ReadReg(MPU6050_GYRO_XOUT_H);
DataL = MPU6050_ReadReg(MPU6050_GYRO_XOUT_L);
*GyroX = (DataH << 8) | DataL;
DataH = MPU6050_ReadReg(MPU6050_GYRO_YOUT_H);
DataL = MPU6050_ReadReg(MPU6050_GYRO_YOUT_L);
*GyroY = (DataH << 8) | DataL;
DataH = MPU6050_ReadReg(MPU6050_GYRO_ZOUT_H);
DataL = MPU6050_ReadReg(MPU6050_GYRO_ZOUT_L);
*GyroZ = (DataH << 8) | DataL;
}
main.c
#include "stm32f10x.h" // Device header
#include "Delay.h"
#include "OLED.h"
#include "MPU6050.h"
uint8_t ID;
int16_t AX, AY, AZ, GX, GY, GZ;
int main(void)
{
OLED_Init();
MPU6050_Init();
OLED_ShowString(1, 1, "ID:");
ID = MPU6050_GetID();
OLED_ShowHexNum(1, 4, ID, 2);
while (1)
{
MPU6050_GetData(&AX, &AY, &AZ, &GX, &GY, &GZ);
OLED_ShowSignedNum(2, 1, AX, 5);
OLED_ShowSignedNum(3, 1, AY, 5);
OLED_ShowSignedNum(4, 1, AZ, 5);
OLED_ShowSignedNum(2, 8, GX, 5);
OLED_ShowSignedNum(3, 8, GY, 5);
OLED_ShowSignedNum(4, 8, GZ, 5);
}
}