[参考译文] BQ27441-G1：设置容量并显示正确的值

尊敬的 Ashish：  

您如何尝试写入电池容量、您能向我提供您已采取的步骤吗？ 是否使用 bqStudio 来读取和写入监测计？ 您能为我提供相关的 gg 文件吗？  

此致、  

Jonny.  

您好！

目前、我正在将该 IC 与我们的嵌入式 Linux 板 进行对接、我引用了 Spark fun 库、但会根据我的 Linux 板更改所有低级接口。 该 spark-fun 库遵循 bq27441-TRM 第14页中提到的所有步骤。

注：我不在使用 bqStudio。

以下是我为电量监测计设置编写的步骤。

void config_gauge()
{
  if (itporFlag())
  {
    setCapacity((uint16_t)bmsconfig.designCapacity);
    delay(2000);
    setDesignEnergy(bmsconfig.designCapacity * 3.7f);
    delay(2000);
    setTerminateVoltage(bmsconfig.terminalVoltage);
    delay(2000);
    setTaperRate(bmsconfig.designCapacity / (.01 * 100));

    printf("MY Desired Full Design_capacity: %d mAh\n", bmsconfig.designCapacity);
    printf("MYFull Design_capacity: %d mAh\n", capacity(DESIGN));
  }
}

以下是低级代码。

int16_t i2cReadBytes(uint8_t subAddress, uint8_t *dest, uint8_t count)
{
	int16_t timeout = BQ72441_I2C_TIMEOUT;
	I2cSendData(BQ72441_I2C_ADDRESS, &subAddress, 1);

	I2cReadData(BQ72441_I2C_ADDRESS, dest, count);

	return timeout;
}

void I2cSendData(uint8_t addr, uint8_t *data, uint8_t len)
{
	if (ioctl(deviceDescriptor, I2C_SLAVE, addr))
		syslog(LOG_USER | LOG_INFO, "I2cSendData_device : IOCTL Problem \n");

	write(deviceDescriptor, data, len);

}

/* This function reads data from the I2C device*/
void I2cReadData(uint8_t addr, uint8_t *data, uint8_t len)
{
	if (ioctl(deviceDescriptor, I2C_SLAVE, addr))
		syslog(LOG_USER | LOG_INFO, "I2cReadData_device : IOCTL Problem \n");

	read(deviceDescriptor, data, len);
}

// // Write a specified number of bytes over I2C to a given subAddress
uint16_t i2cWriteBytes(uint8_t subAddress, uint8_t *src, uint8_t count)
{
	uint8_t buf[3];
	buf[0] = subAddress;
	buf[1] = src[0];
	buf[2] = src[1];

	I2cSendData1(BQ72441_I2C_ADDRESS, buf, 3);
	delay(1); //in ms

	return true;
}

尊敬的 Ashish：  

在尝试更改电量监测计中的每个参数之前、请确保您正在发送 SET_CFGUPDATE 子命令。 如果不这样做、则电量监测计将不允许您写入新值。  

此致、  

Jonny.  

Jonny、您好！

在尝试修改每个参数之前、我已确保正确配置了 SET_CFGUPDATE 子命令。 此外、我已经验证了它是否成功更新了状态。

以下代码供您参考。 请查看：

_Bool setCapacity(uint16_t capacity)
{
	// Write to STATE subclass (82) of BQ27441 extended memory.
	// Offset 0x0A (10)
	// Design capacity is a 2-byte piece of data - MSB first
	// Unit: mAh
	uint8_t capMSB = capacity >> 8;
	uint8_t capLSB = capacity & 0x00FF;
	uint8_t capacityData[2] = {capMSB, capLSB};
	return writeExtendedData(BQ27441_ID_STATE, 10, capacityData, 2);
}

_Bool writeExtendedData(uint8_t classID, uint8_t offset, uint8_t *data, uint8_t len)
{
	if (len > 32)
		return false;

	if (!_userConfigControl)
		enterConfig(false);
	printf("in write extended data\n");
	if (!blockDataControl())	  // // enable block data memory control
		return false;			  // Return false if enable fails
	if (!blockDataClass(classID)) // Write class ID using DataBlockClass()
		return false;

	blockDataOffset(offset / 32); // Write 32-bit block offset (usually 0)
	computeBlockChecksum();		  // Compute checksum going in
	uint8_t oldCsum = blockDataChecksum();
	printf("after checksum data\n");
	//  Write data bytes:
	for (int i = 0; i < len; i++)
	{
		// Write to offset, mod 32 if offset is greater than 32
		// The blockDataOffset above sets the 32-bit block
		writeBlockData((offset % 32) + i, data[i]);
	}
	printf("wroteblock data\n");
	// Write new checksum using BlockDataChecksum (0x60)
	uint8_t newCsum = computeBlockChecksum(); // Compute the new checksum
	writeBlockChecksum(newCsum);

	if (!_userConfigControl)
		exitConfig(true);

	return true;
}
_Bool enterConfig(_Bool userControl)
{
	if (userControl)
		_userConfigControl = true;

	if (sealed())
	{
		_sealFlag = true;
		printf("doing unseal\n");
		unseal(); // Must be unsealed before making changes
	}
	printf("Now in execute control word\n");
	if (executeControlWord(BQ27441_CONTROL_SET_CFGUPDATE))
	{
		int16_t timeout = BQ72441_I2C_TIMEOUT;
		while ((timeout--) && (!(flags() & BQ27441_FLAG_CFGUPMODE)))
		{
			printf("in while loop\n");
			delay1(1);
		}

		if (timeout > 0)
			return true;
	}
	printf("timeout occured\n");
	return false;
}