ID205L smart watch custom firmware WIP

Photos:

Internal photos here

How to open:

i'm pretty sure the easiest way to open it would be using a hot gun and suction cup to remove the glass. What i did is:

1. removed the button (just pull it out firmly)
2. used a hairdryer to soften the glue inside and removed the grey cover around the screen
3. used a hairdryer to soften the glue behind the screen and caaaaaaaarefully pulled it up

How to build firmware

Prebuilt .hex file are located in ./hex/ folder of this repo.

This project uses custom Espruino fork with SPIM and framebuffer modules.

• Checkout espruino sources from here: git@github.com:kvasdopil/Espruino.git
• Make sure you have dos2unix utility installed
• Run ./scripts/provision.py NRF52340DK (this will ask for a filename to patch, just press enter twice)
• copy build/IS205L.py to espruino/boards/

curl https://developer.nordicsemi.com/nRF5_SDK/nRF5_SDK_v15.x.x/nRF5_SDK_15.0.0_a53641a.zip -o nRF5_SDK_15.0.0_a53641a.zip
unzip -o nRF5_SDK_15.0.0_a53641a.zip
mv nRF5_SDK_15.0.0_a53641a/external/nano-pb ./targetlibs/nrf5x_15/external/
rm -rf nRF5_SDK_15.0.0_a53641a.zip nRF5_SDK_15.0.0_a53641a

make clean && BOARD=ID205L RELEASE=1 make

This will build a .hex file with firmware. Now if we flash this the device will stuck in DFU (aka over-the-air update) mode because of invalid DFU settings. To apply correct DFU settings run this (replace 2v05.436 version with yours):

nrfutil settings generate --family NRF52840 --application espruino_2v05.436_id205l.app_hex --app-boot-validation VALIDATE_GENERATED_CRC --application-version 0xff --bootloader-version 0xff --bl-settings-version 2 dfu_settings.hex

python scripts/hexmerge.py --overlap=replace ./targetlibs/nrf5x_15/components/softdevice/s140/hex/s140_nrf52_6.0.0_softdevice.hex bootloader_espruino_2v05.436_id205l.hex espruino_2v05.436_id205l.app_hex dfu_settings.hex -o espruino_2v05.436_id205l.hex

Alternatively you can generate DFU package using

make clean && BOARD=ID205L RELEASE=1 DFU_UPDATE_BUILD=1 make

And update it via BLE.

How to flash

Connect to J-Link to device to following pads:

• VCC - VCC
• G - GND
• DIO - DIO
• C - CLK

Using peripherals

Pinout here

Generally all you want is to import one file to handle all watch peripherals:

const Watch = require("https://github.com/kvasdopil/id205l/blob/master/src/ID205L.js")

Button

Watch.pins.BUTTON.read();

// this also works
BTN1.read();

• TODO: add interrupt-driven events

Charge level

console.log(Watch.isCharging()); // returns true if device is charging
console.log(Watch.getBattery()); // returns battery level from 0.0 to 1.0

• TODO: add interrupt-driven events

Display

Watch.setBacklight(3); // accepts values 0..3, 0 is off

Watch.lcd.enable();
Watch.lcd.init().then(g => {
  g.setColor(1,0,0);
  g.drawString("Hello", 10, 20);
});

• TODO: add buffering and flip()
• TODO: use SPIM interface

Accelerometer

Watch.accelerometer.enable();
console.log(Watch.accelerometer.read()); // returns an object with {x, y, z} values

• TODO: add interrupt-driven events

Heart sensor

Watch.pins.HEART_BACKLIGHT.write(1); 
// this also works
LED1.write(1);

Watch.heart.enable();
console.log(Watch.heart.read(0, 16)); // performs raw i2c read from heart sensor

• TODO: add actual data processing
• TODO: add interrupt-driven events

Touch sensor

Watch.touch.enable();
// interrupt-driven event
Watch.touch.onTouch = (event) => {
  console.log(event.type, event.x, event.y);
};

// this also works
Watch.touch.read(); // returns an object with {type, x, y} values

• TODO: add gestures support

External flash memory

• TODO: make it work

Ask questions

https://gitter.im/nRF51822-Arduino-Mbed-smart-watch/Lobby