BQ27441 I2C通信库实现：I2CTransfer函数详解

/************************************************************************

• LOCAL FUNCTIONS */ void I2CTransfer(uint16_t deviceAddr, uint8_t cmdArray[], uint8_t dataArray[], uint16_t cmdLen, uint16_t dataLen, uint16_t flag) { deviceAddr = BQ27441_G1_ADDR;

  //判断flag if(flag==I2C_FLAG_WRITE_READ) { HAL_I2C_Master_Transmit(I2C_Handle, deviceAddr, cmdArray, cmdLen, HAL_MAX_DELAY); HAL_I2C_Master_Receive(I2C_Handle, deviceAddr, dataArray, dataLen, HAL_MAX_DELAY); } else if (flag==I2C_FLAG_WRITE_WRITE) { HAL_I2C_Master_Transmit(I2C_Handle, deviceAddr, cmdArray, cmdLen, HAL_MAX_DELAY); HAL_I2C_Master_Transmit(I2C_Handle, deviceAddr, dataArray, dataLen, HAL_MAX_DELAY); } }

static uint16_t i2cReadRegister(uint16_t addr,uint8_t regOffset) { uint16_t result = 0x00;

uint8_t cmdArray[1];
uint8_t dataArray[2];

cmdArray[0] = regOffset;
I2CTransfer(addr << 1, cmdArray, dataArray, 1, 2, I2C_FLAG_WRITE_READ );

result = (dataArray[1] << 8) | (dataArray[0]);
return result;
return dataArray[0];

}

static void i2cWriteRegister(uint16_t addr,uint8_t regOffset, uint8_t writeData) { uint8_t cmdArray[1]; uint8_t dataArray[2];

cmdArray[0] = regOffset;
dataArray[0] = writeData;
I2CTransfer(addr << 1, cmdArray, dataArray, 1, 2, I2C_FLAG_WRITE_WRITE );

}

/************************************************************************

• FUNCTIONS */

//BQ27441初始化 bq27441_g1_t* BQ27441_Init() { /* 初始化I2C驱动 */ LL_I2C_Enable(I2C_Handle);

/* 初始化BQ27441 */
bq27441_g1.Read = i2cReadRegister;
bq27441_g1.Write = i2cWriteRegister;

/* 初始化BQ27441相关参数 */

return &bq27441_g1;

}