/********单字节读取*****************************************/
uint8_t I2C_ReadByte(uint8_t SlaveAddress, uint8_t REG_Address)
{
char REG_data;
IIC_Start(); //起始信号
IIC_SendByte(SlaveAddress); //发送设备地址+写信号
IIC_SendByte(REG_Address); //发送存储单元地址，//从0开始
IIC_Start(); //起始信号
IIC_SendByte(SlaveAddress+1); //发送设备地址+读信号
REG_data = IIC_RecvByte(); //读出寄存器数据
IIC_SendNACK();
IIC_Stop(); //停止信号
return REG_data;
}
u8 Single_Read_IIC(u8 SlaveAddress, u8 REG_Address)
{
u8 REG_data;
IIC_Start();
IIC_SendByte(SlaveAddress);
IIC_SendByte(REG_Address);
IIC_Start();
IIC_SendByte(SlaveAddress+1);
REG_data = IIC_RecvByte();
IIC_SendACK();
IIC_Stop();
return REG_data;
}
/*
* Function: burst read bytes
*/
void I2C_ReadBytes(uint8_t SlaveAddress, uint8_t REG_Address, uint8_t *buf, uint8_t num)
{
int i = num;
IIC_Start(); //起始信号
IIC_SendByte(SlaveAddress); //发送设备地址+写信号
IIC_SendByte(REG_Address); //发送存储单元地址，//从0开始
IIC_Start(); //起始信号
IIC_SendByte(SlaveAddress+1); //发送设备地址+读信号
for(i = 0; i < num; i++) {
buf[i] = IIC_RecvByte();
// if it is the last byte to be read, then it should end up with an IIC_SendNACK()
if (i == num - 1) {
IIC_SendNACK();
break;
// else it needs an acknowledgement
} else
IIC_SendACK();
}
IIC_Stop();
return;
}
