Remove sensor index for CO2 sensors:
The is only one CO2 sensor supported at a time => no need to use index numbers. This avoids strange indexing (CO3) as well.
# OSTC4 Code Modules ### Main CPU - aka CPU1-Discovery ##For historical reasons, the firmware of the main CPU was divided in three parts.It helps development, allow smalled upgrades, and improve security as a bad manipulation won't kill the bootloader, responsible fot the next firmware upgrade.### Bootloader ##The code responsible to upload new firmwares for both CPU.### Font Pack ###This module does not contains any code. Just font data and images.### Firmware code ###The main OSTC4 firmware. The more important modules are:- Buehlmann decompression algorithm.- VPM decompression algorithm.- The simulator and dive planner.- Logbook display (surface and dive mode).- All user interface code, during dive or surface mode (`t*.c` files).- Graphics (gfx) engine.- Plus interface to the other CPU, the management of the _LCD_ screen, and the optional _Bonex_ scooter interface (No longer supported)## Small CPU - aka CPU2-RTE ##The _Real Time_ CPU handle everything that requires precise timming to function perperly.The most important modules are:- Real time computation of gas exchanges during dive (aka the _LifeData_ structure).- Analog to digital conversion for the ... ambient light sensor.- I2C bus interface to the pressure sensor, the magnetic compass and the battery gauge.- SPI bus interface to the buttons and to the other CPU.- Serial interface to the _RS232-over-Wireless_ connection.
