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view wiki/Modules.md @ 901:e4e9acfde839 Evo_2_23

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Bugfix simulator/planer: For deco calculation two structures are used. The calculation structure and the input structure. During simulation fast forward (+5min) the input structure is manipulated. Especially for vpm calculation it could happen that the input structure was manipulated and then overwritten by the calculation structure => deco and tts may have wrong values. To avoid this thedeco calculation status is now checked before doing the FF manupulation. Based an calculation state deco or input structures are manipulated. Surface time stamp in planer view: The planer used its own (buggy) implementation for calculation of tts. The timestamp for the surface arrival did not match the bottom time + TTS. The new implementation uses the tts calculated by the deco loop for generation of surface time stamp.
author Ideenmodellierer
date Wed, 02 Oct 2024 22:07:13 +0200
parents 0e7c16dd774d
children
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# 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.