112 lines
3.6 KiB
Markdown
112 lines
3.6 KiB
Markdown
One of the most important component of Flipper Core is [FURI](FURI) (Flipper Universal Registry Implementation). It helps control the applications flow, make dynamic linking and interaction between applications.
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In fact, FURI is just wrapper around RTOS thread management and mutexes, and callback management.
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In this article we create few application, interact between apps, use OS functions and interact with HAL.
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# Simple Blink app
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First, let's create a simple led blinking application.
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## General agreements
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Flipper application is just a function:
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```C
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void application_name(void* p) {
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// Setup
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while(1) {
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// Loop
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}
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}
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```
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1. `void* p` is arbitrary pointer that may be used for pass parameters to application at launch (like argc/argv in POSIX).
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2. Application must never attempt to return or exit from their implementing function.
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3. Avoid long cycles without any "waits" or "blocking" like `delay` or `xQueueReceive`, otherwise your app will blocking overall Flipper work.
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4. Do not create static variables inside function or global variables. Use only local variables. We plan to add virual in-RAM filesystem to save any persistent data.
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## Preparing for launch
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We will use integrated LED. Look at the schematic:
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This led connect between power rail and GPIO PA8 and we should configure this pin as open drain to properly control led behaviour.
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You can find GPIO API in `target_*/flipper_hal.h`. Or if you prefer to use Arduino API, you can find bindings in `core/flipper.h`.
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For work with pin we should:
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1. Create `GpioPin` instance and specify pin and port.
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2. Configure mode of pin by `pinMode` function.
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3. Control state of pin by `digitalWrite` function.
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## Creating application
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1. Create new file (for example, `blink.c`) in `applications` folder.
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2. Create code like this:
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```C
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#include "flipper.h"
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void application_blink(void* p) {
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// create pin
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GpioPin led = {.pin = GPIO_PIN_8, .port = GPIOA};
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// configure pin
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pinMode(led, GpioModeOutput);
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while(1) {
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digitalWrite(led, HIGH);
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delay(500);
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digitalWrite(led, LOW);
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delay(500);
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}
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}
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```
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3. To start your application on Flipper startup, add it to autorun:
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* in `applications/startup.h` add prototype of main application function:
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```C
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void application_blink(void* p);
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```
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* add entry to `FLIPPER_STARTUP` array (pointer to application function and application name):
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```C
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const FlipperStartupApp FLIPPER_STARTUP[] = {
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#ifdef TEST
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{.app = flipper_test_app, .name = "test app"}
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#endif
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// user applications:
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, {.app = application_blink, .name = "blink"}
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};
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```
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4. Add your application file to Makefile (for each target, `target_lo/Makefile` and `target_f1/Makefile`, we add one common makefile later):
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```
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# User application
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C_SOURCES += ../applications/blink.c
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```
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Build and run for linux (target_lo):
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`docker-compose exec dev make -C target_lo`
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Run:
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`docker-compose exec dev target_lo/build/target_lo`.
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Зырим как светодиод пытается мигать.
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_You also run found source of this example in `applications/examples/blink.c` and run by `docker-compose exec dev make -C target_lo example_blink`_
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