Posted on March 18, 2015 at 16:44*�?始化I2C1对外�?�线*/
static void I2C_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd (RCC_APB2Periph_GPIOB, ENABLE );//使能与 I2C1 有关的时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;//PB6-I2C1_SCL�?PB7-I2C1_SDA
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
/*硬件�?置I2C1*/
static void I2C_Mode_Config(void)
{
I2C_InitTypeDef I2C_InitStructure;
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C ; //I2C �?置
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = MPU_ADRESS;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = I2C_Speed;
I2C_Cmd(I2C1,ENABLE);//使能 I2C1
I2C_Init(I2C1, &I2C_InitStructure);//I2C1 �?始化
I2C_AcknowledgeConfig(I2C1, ENABLE);//�?许应答模�?
}
/*
* 函数�??：I2C_MPU6050_ByteWrite
* �??述 ：写一个字节到I2C MPU6050寄存器中
* 输入 ：-pBuffer 缓冲区指针
* -WriteAddr 接收数�?�的MPU6050寄存器的地�?�
* 输出 ：无
* 返回 ：无
* 调用 ：内部调用
*/
static void I2C_MPU_ByteWrite(u8 pBuffer, u8 WriteAddr)
{
while(I2C_GetFlagStatus(I2C1,I2C_FLAG_BUSY));/*wait until I2C bus is not busy*///等待iic总线是�?�忙碌
I2C_GenerateSTART(I2C1, ENABLE);/* Send START condition *///�?��?开始�?�件
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));/* Test on EV5 and clear it *///事件
I2C_Send7bitAddress(I2C1, MPU_ADRESS, I2C_Direction_Transmitter);/* Send MMA address for write *///�?��?设备�?
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));/* Test on EV6 and clear it *///事件
I2C_SendData(I2C1, WriteAddr);/* Send the MMA's Register address to write to *///�?��?设备寄存器地�?�
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));/* Test on EV8 and clear it *///事件
I2C_SendData(I2C1, pBuffer);/* Send the byte to be written *///�?��?写入设备寄存器的数�?�
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));/* Test on EV8 and clear it *///事件
I2C_GenerateSTOP(I2C1, ENABLE);/* Send STOP condition *///�?�止信�?�
}
/*
* 函数�??：I2C_MMA_ByteRead
* �??述 ：从MMA寄存器里�?�读�?�一�?�数�?�。
* 输入 ： -ReadAddr 接收数�?�的MMA寄存器的地�?�。
* 输出 ：无
* 返回 ：读�?�出的寄存器数�?�
* 调用 ：内部调用
*/
void I2C_MPU_ByteRead(uint32_t* pBuffer, uint32_t ReadAddr, uint32_t NumByteToRead)//第一个�?�数是指针�?��?，读第一个地�?��?�加1，
//第二个�?�数是寄存器地�?�，�?�需�?填入第一个地�?��?��?� //在读第二个地�?�，第三个�?�数是多少个8�?，指针好累加
{
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));//检测忙碌
I2C_GenerateSTART(I2C1, ENABLE);//开始信�?�
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));//应答
I2C_Send7bitAddress(I2C1, MPU_ADRESS, I2C_Direction_Transmitter);//�?��?设备地�?�
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));//应答
I2C_Cmd(I2C1, ENABLE);//使能iic
I2C_SendData(I2C1, ReadAddr);//�?��?设备寄存器地�?�
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));//应答
I2C_GenerateSTART(I2C1, ENABLE);//开始信�?�
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));//应答
I2C_Send7bitAddress(I2C1, MPU_ADRESS, I2C_Direction_Receiver);//�?��?设备地�?��?+1，读信�?�
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));//应答
while(NumByteToRead)
{
if(NumByteToRead == 1)//如果就读一个一节
{
I2C_AcknowledgeConfig(I2C1, DISABLE);//�?�应答
I2C_GenerateSTOP(I2C1, ENABLE);//�?�止信�?�
}
if(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))//应答
{
*pBuffer = I2C_ReceiveData(I2C1);//读出数�?�传给指针�?��?
pBuffer++;//指针�?��?地�?�+1
NumByteToRead--;//�?读的地�?�里�?�的数�?�个数-1
}
}
I2C_AcknowledgeConfig(I2C1, ENABLE);//�?�应答
}
