https://github.com/codebot/smartwatch

sandbox for playing around with PineTime firmware
https://github.com/codebot/smartwatch

Last synced: 3 months ago
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sandbox for playing around with PineTime firmware

• Host: GitHub
• URL: https://github.com/codebot/smartwatch
• Owner: codebot
• License: apache-2.0
• Archived: true
• Created: 2019-11-04T13:15:28.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2019-11-05T13:00:11.000Z (over 4 years ago)
• Last Synced: 2024-01-27T01:05:18.989Z (5 months ago)
• Size: 45.9 KB
• Stars: 2
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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• awesome-pinetime - codebot/smartwatch -- Just some notes so far

README

        
# Smartwatch

Official website: https://wiki.pine64.org/index.php/PineTime

This repo is just my sandbox for playing around with PineTime firmware.

These notes are only tested on Ubuntu 18.04.3 LTS

# Compiling notes

 * `sudo apt install gcc-arm-none-eabi`

 * Download the [nRF5 SDK v16.0](https://www.nordicsemi.com/Software-and-Tools/Software/nRF5-SDK) and extract it somewhere. Set `$NRF_SDK` to that path.

 * Update the cross-compiler paths and version in `$NRF_SDK/components/toolchain/gcc/Makefile.posix`  :

```

GNU_INSTALL_ROOT ?= /usr/bin

GNU_VERSION ?= 6.3.1

GNU_PREFIX ?= arm-none-eabi

```

## Using the SDK

Looks like the SDK wants the custom board to be called `custom_board.h` and

then needs to see `#define BOARD_CUSTOM`

# Flashing notes

## initial unprotect + erase

from https://forum.pine64.org/showthread.php?tid=8143

```

source [find interface/cmsis-dap.cfg]

source [find target/nrf52.cfg]

init

nrf52.dap apreg 1 0x04 0x01

sleep 100

shutdown

```

# Schematic notes

(Just a few random notes recorded when parsing the schematic and datasheets.)

## SoC + flash

[nRF52832](https://www.nordicsemi.com/Products/Low-power-short-range-wireless/nRF52832)

 * ARM Cortex-M4F

 * crystals: 32.768 kHz and 32 MHz

 * external SPI flash: PM25LV512

   * 64 Kbyte (512 Kbit)

   * 256 byte pages, 4 Kbyte sectors, 32 Kbyte blocks

   * 2ms page program, 60ms sector erase

   * 200,000 program/erase cycles per sector

## Power scheme

Single-cell LiPo. Charge cradle powered by USB (5 VDC) feeds +5V through two

parallel Schottkey diodes into the charge IC. Battery powers two LDO's which

power everything except the vibration motor and heart-rate sensor.

 * charger IC: SGM40561

 * VCC33 (main LDO): ME6206

 * VDD33 (low-noise sensor LDO): SGM2036-3.3

## Sensors

 * accelerometer: Bosch BMA421

 * touch sensor (not populated?): tontek TTP233D-QA6

## LCD

 * connected via SPI