mirror of
https://github.com/DarkFlippers/unleashed-firmware
synced 2024-11-27 15:00:46 +00:00
72 lines
2.4 KiB
Markdown
72 lines
2.4 KiB
Markdown
|
In this example we try to use FURI for interacting between user application and core subsystem.
|
||
|
|
|
||
|
|
First of all, we open FURI record by name "tty". This record is used for send some debug/logging info and interact with user by kind-of-TTY (like UART or USB CDC). By default on Flipper target all writes to tty record handled by debug UART (configured by `DEBUG_UART` define). On local target all writes simply prints to stdout.
|
||
|
|
|
||
|
|
Open record:
|
||
|
|
|
||
|
|
```C
|
||
|
|
FuriRecordSubscriber* log = get_default_log();
|
||
|
|
```
|
||
|
|
|
||
|
|
This is just wrapper on common FURI method:
|
||
|
|
|
||
|
|
```C
|
||
|
|
furi_open("tty", false, false, NULL, NULL);
|
||
|
|
```
|
||
|
|
|
||
|
|
"tty" is FURI pipe record. It means that there is no "data" hold in record, it only manage callbacks: when you call `furi_write`, all subscriber's callback is called. You can find default implementation in `core/tty_uart.c`.
|
||
|
|
|
||
|
|
Let's get a look at full example code:
|
||
|
|
|
||
|
|
```C
|
||
|
|
#include "flipper.h"
|
||
|
|
#include <string.h>
|
||
|
|
#include "log.h"
|
||
|
|
|
||
|
|
void application_uart_write(void* p) {
|
||
|
|
// Red led for showing progress
|
||
|
|
GpioPin led = {.pin = GPIO_PIN_8, .port = GPIOA};
|
||
|
|
pinMode(led, GpioModeOpenDrain);
|
||
|
|
|
||
|
|
// get_default_log open "tty" record
|
||
|
|
FuriRecordSubscriber* log = get_default_log();
|
||
|
|
|
||
|
|
// create buffer
|
||
|
|
const char test_string[] = "test\n";
|
||
|
|
furi_write(log, test_string, strlen(test_string));
|
||
|
|
|
||
|
|
// for example, create counter and show its value
|
||
|
|
uint8_t counter = 0;
|
||
|
|
|
||
|
|
while(1) {
|
||
|
|
// continously write it to UART
|
||
|
|
fuprintf(log, "counter: %d\n", counter);
|
||
|
|
counter++;
|
||
|
|
|
||
|
|
// flash at every send
|
||
|
|
digitalWrite(led, LOW);
|
||
|
|
delay(50);
|
||
|
|
digitalWrite(led, HIGH);
|
||
|
|
|
||
|
|
// delay with overall perion of 1s
|
||
|
|
delay(950);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
This code demonstrates two way to work with record:
|
||
|
|
|
||
|
|
1. Directly writes some data by `furi_write`
|
||
|
|
2. Uses `fuprintf` wrapper on `printf`.
|
||
|
|
|
||
|
|
For creating application and set it to autorun, read [Blink example](Blink-app).
|
||
|
|
|
||
|
|
_You can also find source of this example in `applications/examples/uart_write.c` and run it by `docker-compose exec dev make -C target_lo example_uart_write`_
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
_Code for target F1 can be compiled by `docker-compose exec dev make -C target_f1 example_uart_write`_
|
||
|
|
|
||
|
|
|
||
|
|
|