BQ27441_G1 I2C 传输函数实现 - 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; // 设置设备地址为 BQ27441_G1_ADDR

  // 根据 flag 进行不同的传输方式 if(flag == I2C_FLAG_WRITE_READ) { // 发送写命令 HAL_I2C_Master_Transmit(I2C_Handle, deviceAddr << 1, cmdArray, cmdLen, I2C_TIMEOUT); // 接收数据 HAL_I2C_Master_Receive(I2C_Handle, deviceAddr << 1, dataArray, dataLen, I2C_TIMEOUT); } else if (flag == I2C_FLAG_WRITE_WRITE) { // 发送写命令和数据 HAL_I2C_Master_Transmit(I2C_Handle, deviceAddr << 1, cmdArray, cmdLen + dataLen, I2C_TIMEOUT); } }

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 模块 */ LL_I2C_Enable(I2C_Handle);

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

/* 初始化 BQ27441 结构体 */

return &bq27441_g1;

}