View Source M5Stack MP135
This is the Nerves System configuration for the M5CoreMP135
| Feature | Description |
|---|---|
| CPU | STM32MP135DAE7@Arm Cortex-A7@1GHz |
| Memory | 512 MB DRAM |
| Storage | MicroSD card |
| Linux Kernel | 5.15 |
| IEx terminal | HDMI and USB keyboard (can be changed to UART) |
| GPIO, I2C, SPI | Yes - Elixir Circuits |
| ADC | No |
| PWM | Yes, but no Elixir support |
| UART | ttySTM0 + more via device tree overlay |
| LCD | Yes |
| Camera | None |
| Ethernet | 2x RJ45 |
| WiFi | No |
| Bluetooth | No |
| Audio | TBD |
Project Status
This project is still a work in progress, and any issues will be tracked and resolved through GitHub. While I’m passionate about Nerves, I’m not an expert on Core MP135, so any help with fixes would be greatly appreciated. Contributions through pull requests are very welcome!
Using
create a project with mix nerves.new
add {:nerves_system_m5stack_core_mp135, "~> 0.0.7", runtime: false, targets: :m5stack_core_mp135} in deps in mix.exs
add :m5stack_core_mp135 in the @all_targets in mix.exs
export MIX_TARGET=m5stack_core_mp135.
run mix deps.get
run mix firmware
See the Getting started guidefor more information.
Provisioning devices
This system supports storing provisioning information in a small key-value store outside of any filesystem. Provisioning is an optional step and reasonable defaults are provided if this is missing.
Provisioning information can be queried using the Nerves.Runtime KV store's
Nerves.Runtime.KV.get/1
function.
Keys used by this system are:
| Key | Example Value | Description |
|---|---|---|
nerves_serial_number | "12345678" | By default, this string is used to create unique hostnames and Erlang node names. |
The normal procedure would be to set these keys once in manufacturing or before deployment and then leave them alone.
For example, to provision a serial number on a running device, run the following and reboot:
iex> cmd("fw_setenv nerves_serial_number 12345678")This system supports setting the serial number offline. To do this, set the
NERVES_SERIAL_NUMBER environment variable when burning the firmware. If you're
programming MicroSD cards using fwup, the commandline is:
sudo NERVES_SERIAL_NUMBER=12345678 fwup path_to_firmware.fw
Serial numbers are stored on the MicroSD card so if the MicroSD card is replaced, the serial number will need to be reprogrammed. The numbers are stored in a U-boot environment block. This is a special region that is separate from the application partition so reformatting the application partition will not lose the serial number or any other data stored in this block.
Additional key value pairs can be provisioned by overriding the default
provisioning.conf file location by setting the environment variable
NERVES_PROVISIONING=/path/to/provisioning.conf. The default provisioning.conf
will set the nerves_serial_number, if you override the location to this file,
you will be responsible for setting this yourself.