.. _pinetime_devkit0:

Pine64 PineTime DevKit0
#######################

Overview
********

.. figure:: img/PineTime_leaflet.jpg
   :align: center
   :alt: Pine64 PineTime

   PineTime leaflet (Credit: Pine64)


The Pine64 smartwatch, dubbed "PineTime", is a product of a community effort
for an open source smartwatch in collaboration with wearable RTOS and Linux
app developers/communities.

.. figure:: img/PineTime_DevKit0.jpg
   :align: center
   :alt: Pine64 PineTime

   PineTime Dev Kit (Credit: Pine64)

Hardware
********

The PineTime is based on a Nordic NRF52832 chip and features:

- CPU: 64 MHz Cortex-M4 with FPU
- RAM: 64KB SRAM
- Flash: 512KB on board flash with additional 4MB SPI NOR XT25F32B
- Display: 1.3 inches (33mm), 240x240 pixels display with ST7789 driver
- Touchscreen: CST816S Capacitive Touch
- Battery: 170-180mAh 3.8V LiPo
- BMA421 Triaxial Acceleration Sensor
- HRS3300 PPG Heart Rate Sensor
- Vibration motor

PineTime schematics
========================

The `PineTime schematics`_ are available on the pine64 website. Below
is an overview of the NRF52 port assignment.

+----------------------+---------------------------------+-----------+
| NRF52 pins           | Function                        | Direction |
+======================+=================================+===========+
| P0.00/XL1            | 32.768 kHz –XL1                 |           |
+----------------------+---------------------------------+-----------+
| P0.01/XL2            | 32.768 kHz –XL2                 |           |
+----------------------+---------------------------------+-----------+
| P0.02/AIN0           | SPI-SCK, LCD_SCK                | OUT       |
+----------------------+---------------------------------+-----------+
| P0.03/AIN1           | SPI-MOSI, LCD_SDI               | OUT       |
+----------------------+---------------------------------+-----------+
| P0.04/AIN2           | SPI-MISO                        | IN        |
+----------------------+---------------------------------+-----------+
| P0.05/AIN3           | SPI-CE# (SPI-NOR)               | OUT       |
+----------------------+---------------------------------+-----------+
| P0.06                | BMA421-SDA, HRS3300-SDA, TP-SDA | I/O       |
+----------------------+---------------------------------+-----------+
| P0.07                | BMA421-SCL, HRS3300-SCL, TP-SCL | OUT       |
+----------------------+---------------------------------+-----------+
| P0.08                | BMA421-INT                      | IN        |
+----------------------+---------------------------------+-----------+
| P0.09/NFC1           | LCD_DET                         | OUT       |
+----------------------+---------------------------------+-----------+
| P0.10/NFC2           | TP_RESET                        | OUT       |
+----------------------+---------------------------------+-----------+
| P0.11                |                                 |           |
+----------------------+---------------------------------+-----------+
| P0.12                | CHARGE INDICATION               | IN        |
+----------------------+---------------------------------+-----------+
| P0.13                | PUSH BUTTON_IN                  | IN        |
+----------------------+---------------------------------+-----------+
| P0.14/TRACEDATA3     | LCD_BACKLIGHT_LOW               | OUT       |
+----------------------+---------------------------------+-----------+
| P0.15/TRACEDATA2     | PUSH BUTTON_OUT                 | OUT       |
+----------------------+---------------------------------+-----------+
| P0.16/TRACEDATA1     | VIBRATOR OUT                    | OUT       |
+----------------------+---------------------------------+-----------+
| P0.17                |                                 |           |
+----------------------+---------------------------------+-----------+
| P0.18/TRACEDATA0/SWO | LCD_RS OUT                      |           |
+----------------------+---------------------------------+-----------+
| P0.19                | POWER PRESENCE INDICATION       | IN        |
+----------------------+---------------------------------+-----------+
| P0.20/TRACECLK       |                                 |           |
+----------------------+---------------------------------+-----------+
| P0.21/nRESET         |                                 |           |
+----------------------+---------------------------------+-----------+
| P0.22                | LCD_BACKLIGHT_MID               | OUT       |
+----------------------+---------------------------------+-----------+
| P0.23                | LCD_BACKLIGHT_HIGH              | OUT       |
+----------------------+---------------------------------+-----------+
| P0.24                | 3V3 POWER CONTROL               | OUT       |
+----------------------+---------------------------------+-----------+
| P0.25                | LCD_CS                          | OUT       |
+----------------------+---------------------------------+-----------+
| P0.26                | LCD_RESET                       | OUT       |
+----------------------+---------------------------------+-----------+
| P0.27                | STATUS LED (NOT STAFF)          | OUT       |
+----------------------+---------------------------------+-----------+
| P0.28/AIN4           | TP_INT                          | IN        |
+----------------------+---------------------------------+-----------+
| P0.29/AIN5           |                                 |           |
+----------------------+---------------------------------+-----------+
| P0.30/AIN6           | HRS3300-TEST                    | IN        |
+----------------------+---------------------------------+-----------+
| P0.31/AIN7           | BATTERY VOLTAGE (Analog)        | IN        |
+----------------------+---------------------------------+-----------+

Building
********

In order to get started with Zephyr on the PineTime, you can use the
board-specific sample:

.. zephyr-app-commands::
   :zephyr-app: samples/boards/pine64_pinetime
   :board: pinetime_devkit0
   :goals: build

Programming and Debugging
*************************

The PineTime Dev Kit comes with the back not glued down to allow it to be
easily reprogrammed.

The kit does not include a hardware programmer, but existing debuggers
supporting SWD can be used.

These are the necessary steps for debugging:

- Unlock the device
- Upload new software
- Run a debugger

More infos to be found in the `Wiki Reprogramming the PineTime`_ page.

Debugger connection
===================

The dev kits have exposed SWD pins for flashing and debugging.

Only a few devs have soldered to these pins, most just use friction to make
contact with the programming cable.

The pinout is:

.. figure:: img/PineTime_SWD_location.jpg
   :align: center
   :alt: PineTime SWD location

Unlocking the Flash memory
==========================

Unlocking the device is a one-time action that is needed to enable to debug
port and provide full access to the device. This will erase all existing
software from the internal flash.

**Note: PineTime watches shipped after 20 Sep 2020 do not require unlocking. They are shipped unlocked.**

.. code-block:: console

   $ nrfjprog -f NRF52 --recover

Flashing
========

Using nrfjprog, flashing the PineTime is done with the command:

.. code-block:: console

   $ nrfjprog -f NRF52 --program firmware.hex --sectorerase

Debugging
=========

Using Segger Ozone debugger, debugging and flashing is made easy.

Simply load the .elf file containing the final firmware and
setup the debugger to use SWD over USB for the chip nRF52832_xxAA.
This setup can be done using the menu Tools/J-Link Settings. or by directly
typing the following in the debugger console:

.. code-block:: console

   $ Project.SetDevice ("nRF52832_xxAA");
   $ Project.SetHostIF ("USB", "");
   $ Project.SetTargetIF ("SWD");
   $ Project.SetTIFSpeed ("4 MHz");
   $ File.Open ("path/to/your/build/zephyr/zephyr.elf");

References
**********

.. target-notes::

.. _Pine64 PineTime presentation:
   https://www.pine64.org/pinetime

.. _Pine64 PineTime wiki page:
   https://wiki.pine64.org/index.php/PineTime

.. _Pine64 forum:
   https://forum.pine64.org

.. _PineTime schematics:
   http://files.pine64.org/doc/PineTime/PineTime%20Schematic-V1.0a-20191103.pdf

.. _Wiki Reprogramming the PineTime:
   https://wiki.pine64.org/index.php/Reprogramming_the_PineTime