https://github.com/mongoose-os-libs/bq27421

Mongoose OS Driver for TI BQ27421 Fuel Gauge
https://github.com/mongoose-os-libs/bq27421

Last synced: about 2 months ago
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Mongoose OS Driver for TI BQ27421 Fuel Gauge

• Host: GitHub
• URL: https://github.com/mongoose-os-libs/bq27421
• Owner: mongoose-os-libs
• License: other
• Created: 2019-07-08T15:40:06.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2021-12-15T00:16:59.000Z (almost 3 years ago)
• Last Synced: 2024-05-31T11:36:41.077Z (4 months ago)
• Language: C
• Size: 4.88 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-mongoose-os - bq27421 - Mongoose OS Driver for TI BQ27421 Fuel Gauge (Awesome Mongoose OS [](https://awesome.re) / Official Libraries)

README

        
# Mongoose OS Driver for TI BQ27421 Fuel Gauge

## Overview

This library contains driver for the [TI BQ27421](http://www.ti.com/product/BQ27421-G1) li-ion battery fuel gauge.

## Example usage

Initialize and read some registers:

```c

#include "mgos.h"

#include "mgos_bq27421.h"

struct mgos_bq27421 *g = mgos_bq27421_create(mgos_i2c_get_global());

uint16_t dt = 0, fwv = 0, dcap = 0;

if (!mgos_bq27421_ctl_read(g, MGOS_BQ27421_CTL_DEVICE_TYPE, &dt) ||

    !mgos_bq27421_ctl_read(g, MGOS_BQ27421_CTL_FW_VERSION, &fwv) ||

    !mgos_bq27421_reg_read(g, MGOS_BQ27421_REG_CAP_DESIGN, &dcap)) {

  // Error

}

LOG(LL_INFO, ("Gauge type 0x%x, fw version 0x%x, battery design capacity %u mAh", dt, fwv, dcap));

```

Update battery design capacity (signed 16-bit integer in data class 82 at offset 10):

```

if (!mgos_bq27421_data_write_i2(g, 82, 10, 1234 /* mAh */)) {

  // Error

}

```

The rest of the API is documented in the [include/mgos_bq27421.h](header file).

## Acknowledgements

This driver is contributed by [Watchdog System](https://www.watchdog-system.com/).

## License

Released under Apache License 2.0, see [LICENSE](LICENSE) file.