68 lines
1.5 KiB
Markdown
68 lines
1.5 KiB
Markdown
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# Synopsis
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Exposes readings from an ADC pin (currently: *PA3*) of the board via a
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TCP service on the Ethernet port.
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# Network Protocol
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Sensor readings produce lines of `key=value` pairs, joined by `,`,
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terminated by `"\r\n"`.
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```
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t=21000,pa3=685
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t=22000,pa3=684
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t=23000,pa3=681
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t=24000,pa3=696
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t=25000,pa3=673
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t=26000,pa3=689
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t=27000,pa3=657
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t=28000,pa3=654
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t=29000,pa3=652
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t=30000,pa3=662
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t=31000,pa3=663
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```
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| Key | Value | Unit |
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|:---:|-------------|------|
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| t | Time | ms |
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| pa3 | ADC reading | mV |
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# LEDs
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Colors indicate what the MCU is occupied with.
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| Color | Indication |
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|:-------:|-------------------|
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| Green | WFI (idle) |
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| Blue | Network poll |
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| Red | Message broadcast |
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# Crate features
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* `semihosting` enables log output via the **cortex-m-semihosting**
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crate. Use only in development! MCU will hang when no OpenOCD is
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running.
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* `generate-hwaddr` generates an Ethernet MAC address by hashing the
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unique device ID from flash memory.
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# Instructions
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## Build the firmware with `default.nix`
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* `nix-build`
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* This uses **cargo-vendor** to bundle dependencies, so that unstable versions from git can be used.
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* Run `result/bin/flash-adc2tcp` to flash a devboard with OpenOCD and quit.
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## Development environment with `shell.nix`
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* `nix-shell`
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* Spawning `openocd`, the devboard should be connected already.
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* Instructions (`cargo run --release`) are printed.
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