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@ -58,6 +58,7 @@ In newer M20 sondes u-blox MAX-M10M that uses NMEA protocol.
In older M20 sondes XM1110 GPS module was used. It transmits data over UART but with custom firmware that transmits only binary protocol data.
![alt text](https://github.com/sq2ips/m20-custom-firmware/blob/main/img/gps_old.jpg?raw=true)
Data format:
![alt text](https://github.com/sq2ips/m20-custom-firmware/blob/main/img/GPS.png?raw=true)
@ -90,15 +91,15 @@ Or directly from [here](https://github.com/sq2ips/m20-custom-firmware/archive/re
Before building the firmware you fist need to configure parameters located in the [`config.h`](https://github.com/sq2ips/m20-custom-firmware/blob/main/m20/Core/Inc/config.h) file.
TODO description
# Building the firmware
Beofere flashing the firmware you need to build it first, there are a few ways you can do it depending on the platform:
Before flashing the firmware you need to build it first, there are a few ways you can do it depending on the platform:
## Building directly on Linux
To build directly on linux you need the arm-none-eabi toolchain, you can install it from your package manager depending on the linux distro.
For example, on Debian it will look like this:
```bash
sudo apt install gcc-arm-none-eabi
```
### WARNING: in difrent distros version of the toolchain can varry and result in a too big result file
Another way that avoids this problem is downloading the toolchain from [here](https://developer.arm.com/-/media/Files/downloads/gnu/14.2.rel1/binrel/arm-gnu-toolchain-14.2.rel1-x86_64-arm-none-eabi.tar.xz).
### WARNING: in different distros version of the toolchain can varry and result in a too big result file
A way to avoids this problem is downloading the toolchain from [here](https://developer.arm.com/-/media/Files/downloads/gnu/14.2.rel1/binrel/arm-gnu-toolchain-14.2.rel1-x86_64-arm-none-eabi.tar.xz).
After downloading you need to extract it:
```bash
tar -xvf arm-gnu-toolchain-14.2.rel1-x86_64-arm-none-eabi.tar.xz