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47 lines
2.1 KiB
Markdown
47 lines
2.1 KiB
Markdown
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# STM32F411CEU6 ADC example
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This example is a continuation of the **stm32f411_adc**.
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In this variant, there are 3 tasks (1 HW & 2 SW) involved and communication between them by means of an MPSC channel.
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In the `#[init]` before spawning any task, an MPSC channel is created and split in its two parts.
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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.
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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.
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## Hardware task bound to EXTI0: `gpio_interrupt_handler`
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This task,
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- Decreases the value of __delayval__ by 200
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- Takes a new sample from the ADC input connected on pin `PA1`
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- Sends a message of type `Message::PotentiometerValue` to the printer task
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- Clears the interrupt_pending_bit
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## Software task: `printer_actor`
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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.
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Depending on the type of message received, it prints something different.
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## Software task: `pinger`
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This is just a simple task that sends ping every 25000 millis and uses __SPI2__ as a dispatcher.
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## How-to
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### Build
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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.
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### Run
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Install `probe-rs` and configure it using the [debugging extension for VScode](https://probe.rs/docs/tools/debugger/).
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The output should look like this:
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```
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INFO Printer actor received a PING from software task
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INFO Current delay value 1900
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INFO Printer actor received a new PotentiometerValue: 607 from hardware task.
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INFO Current delay value 1800
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INFO Printer actor received a new PotentiometerValue: 1011 from hardware task.
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INFO Current delay value 1700
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INFO Printer actor received a new PotentiometerValue: 819 from hardware task.
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INFO Printer actor received a PING from software task
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```
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