|Pascal Engélibert a4884bd189|
(temporary name) (early development)
OS for a dumbphone based on Maduino Zero 4G LTE board.
GSM will be shutting down in France in a few years so if you have an old cellphone and don't want to buy a fancy, spying, expensive smartphone, making your own 4G cellphone is an interesting option.
- Low cost
- Long battery life (this one will be complicated)
- Low-consumption components
- Use less CPU cycles
- Update display less often
- Use less wireless RX/TX
- Usable for basic things (call, messages, agenda, contacts, notepad)
- Customizable (smartphones don't do exactly what I want)
- (long term) Mesh networking and other cool stuff
sudo pacman -S arm-none-eabi-gcc rustup target add thumbv6m-none-eabi
cargo run --features simulator
cargo build --release --target thumbv6m-none-eabi
- D5 (internally assigned): modem power
- D6 (internally assigned): modem reset
- D7 (internally assigned): flightmode
- A1 (internally assigned): vbat
- A2 (internally assigned): vsys
- SDA: I2C
- SCL: I2C
- display SPI: 3 pins
- keypad: 6 pins (74HC565+75HC165), maybe 5 if the same clock is used
- display LED: 1 pin
- torch LED: 1 pin
- ESP UART: 2 pins (I2C still possible if not enough pins)
Note: at most 5 outputs of the 74HC565 may be used as GPO.
- Maybe an ESP for WIFI and Bluetooth: https://www.sparkfun.com/products/18034
- bitmap-font ?
- https://lib.rs/crates/at-commands OR https://lib.rs/crates/atat
- Play audio
- Send call
- Send message
- Show bitmap
Optimized to reduce the number of consecutive presses on the same key in French.
For example, the letters m, o, n are on the same key
MNO6 but they frequently appear consecutively in French, so you have to wait between each letter. Having them on three different keys solves this problem.
ncb1 upz2 tdk3 eow4 lqh5 age6 sfx7 rmj8 ivy9