mirror of
https://github.com/rtic-rs/rtic.git
synced 2024-12-27 04:19:33 +01:00
47 lines
2.1 KiB
Markdown
47 lines
2.1 KiB
Markdown
|
# STM32F411CEU6 ADC example
|
||
|
|
This example is a continuation of the **stm32f411_adc**.
|
||
|
|
In this variant, there are 3 tasks (1 HW & 2 SW) involved and communication between them by means of an MPSC channel.
|
||
|
|
|
||
|
|
In the `#[init]` before spawning any task, an MPSC channel is created and split in its two parts.
|
||
|
|
Immediately after separating the `Receiver` and `Sender` the software task `printer_actor` is spawned and receives the `Receiver` end of the channel and starts listening.
|
||
|
|
|
||
|
|
Then two clones of the `Sender` type are created. The first one is stored as Local resource for the HW task and the second, is passed as an argument when the `pinger` software task is spawned.
|
||
|
|
|
||
|
|
## Hardware task bound to EXTI0: `gpio_interrupt_handler`
|
||
|
|
This task,
|
||
|
|
- Decreases the value of __delayval__ by 200
|
||
|
|
- Takes a new sample from the ADC input connected on pin `PA1`
|
||
|
|
- Sends a message of type `Message::PotentiometerValue` to the printer task
|
||
|
|
- Clears the interrupt_pending_bit
|
||
|
|
|
||
|
|
## Software task: `printer_actor`
|
||
|
|
This task makes use of the unused interrupt __SPI1__ as a dispatcher. Since it is an async fn, it ia constantly awaiting for incoming messages from other actors.
|
||
|
|
Depending on the type of message received, it prints something different.
|
||
|
|
|
||
|
|
## Software task: `pinger`
|
||
|
|
This is just a simple task that sends ping every 25000 millis and uses __SPI2__ as a dispatcher.
|
||
|
|
|
||
|
|
## How-to
|
||
|
|
|
||
|
|
### Build
|
||
|
|
Run `cargo build --release` to compile the code. If you run it for the first time, it will take some time to download and compile dependencies.
|
||
|
|
|
||
|
|
### Run
|
||
|
|
Install `probe-rs` and configure it using the [debugging extension for VScode](https://probe.rs/docs/tools/debugger/).
|
||
|
|
|
||
|
|
The output should look like this:
|
||
|
|
|
||
|
|
```
|
||
|
|
INFO Printer actor received a PING from software task
|
||
|
|
INFO Current delay value 1900
|
||
|
|
INFO Printer actor received a new PotentiometerValue: 607 from hardware task.
|
||
|
|
|
||
|
|
INFO Current delay value 1800
|
||
|
|
INFO Printer actor received a new PotentiometerValue: 1011 from hardware task.
|
||
|
|
|
||
|
|
INFO Current delay value 1700
|
||
|
|
INFO Printer actor received a new PotentiometerValue: 819 from hardware task.
|
||
|
|
|
||
|
|
INFO Printer actor received a PING from software task
|
||
|
|
```
|