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advise against unecessary additional tasks in docs

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Clemens von Molo 2021-10-05 18:55:02 +02:00
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doc/code/Intro.md
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@ -6,8 +6,9 @@ Infinitime is based on FreeRTOS, a real-time operating system. FreeRTOS provides
### Tasks
Tasks are created by calling `xTaskCreate` and passing a function with the signature `void functionName(void*)`. For more info on task creation see the [FreeRTOS Documentation](https://www.freertos.org/a00125.html).
In our case, main calls `systemTask.Start()`, which creates the **"MAIN" task**. The function running inside that task is `SystemTask::Work()`. Both functions are located inside systemtask/SystemTask.cpp . `SystemTask::Work()` initializes all the driver and controller objects. It also starts the **task "displayapp"**, which is responsible for launching and running apps, controlling the screen and handling touch events (or forwarding them to the active app). You can find the "displayapp" task inside displayapp/DisplayApp.cpp .
There are also other tasks that are responsible for Bluetooth ("ll" and "ble" inside libs/mynewt-nimble/porting/npl/freertos/src/nimble_port_freertos.c) and periodic tasks like heartrate measurements (heartratetask/HeartRateTask.cpp).
In our case, main calls `systemTask.Start()`, which creates the **"MAIN" task**. The function running inside that task is `SystemTask::Work()`. You may also see this task being referred to as the **work task**. Both functions are located inside systemtask/SystemTask.cpp . `SystemTask::Work()` initializes all the driver and controller objects. It also starts the **task "displayapp"**, which is responsible for launching and running apps, controlling the screen and handling touch events (or forwarding them to the active app). You can find the "displayapp" task inside displayapp/DisplayApp.cpp .
There are also other tasks that are responsible for Bluetooth ("ll" and "ble" inside libs/mynewt-nimble/porting/npl/freertos/src/nimble_port_freertos.c) and periodic tasks like heartrate measurements (heartratetask/HeartRateTask.cpp). <br>
While it is possible for you to create your own task when you need it, it is recommended to just add functionality to `SystemTask::Work()` if possible. If you absolutely need to create another task, try to guess how much stack space (in words/4-byte packets) it will need instead of just typing in a large-ish number. You can use the define `configMINIMAL_STACK_SIZE` which is currently set to 120 words.
## Controllers
Controllers in InfiniTime are singleton objects that can provide access to certain resources to apps. Some of them interface with drivers, others are the driver for the resource. The resources provided don't have to be hardware-based. They are declared in main.cpp and initialized in systemtask/SystemTask.cpp . Some controllers can be passed by reference to apps that need access to the resource (for example vibration motor).