d80c35984e
Develop the full Daisy Pod spike so it can be flashed the moment the board arrives. Architecture: one shared engine, two front-ends. - pm-synth: make it `#![no_std]` (mirroring track-format), routing float math through `libm` so the SAME f32 code runs on the host and on the Daisy's Cortex-M7F (hardware FPU — no fixed-point port needed). Add `Player`, a self-running sequencer that owns the Synth + scheduled clicks and renders sample-by-sample, looping at the pattern boundary. Integer-only hot path (clicks pre-resolved to sample indices); exposes a `fired()` beat counter. Add SPIKE_PROGRAM/SPIKE_BARS as the shared source of truth. - synthrender: render the SAME Player to pm-daisy-preview.wav — the host-side "simulator". Bit-identical preview of the hardware output (before its codec); far more useful than chip emulation (Renode can't model the audio codec). - pm-daisy (new, workspace-excluded firmware): thin BSP binary for the Daisy Seed/Pod. embedded-alloc heap + board bring-up + SAI-DMA audio interrupt feeding Player::next_sample() into stereo frames, USER LED flashing per click. Audio loop follows the `daisy` crate's examples/audio.rs. Board revision (codec) is a Cargo feature; README documents matching it + both flash paths (probe-rs/RTT and USB DFU) + the QSPI-bootloader fallback. Verified without hardware: host build + preview render (48 kHz, onsets on the 8th-note grid at 124 BPM); firmware cross-compiles + links for thumbv7em-none- eabihf at ~87 KB (fits the 128 KB internal flash) across all three codec revisions; track-format conformance + `node tests/run.mjs` (47 pass) still green. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
64 lines
3.1 KiB
Markdown
64 lines
3.1 KiB
Markdown
# pm-daisy — PolyMeter click engine on the Daisy Pod
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A time-boxed spike (see [`docs/daisy-spike.md`](../../docs/daisy-spike.md)): play the PolyMeter
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groove engine on real Cortex-M7 hardware to judge whether the [Electrosmith Daisy
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Pod](https://electro-smith.com/products/pod) (STM32H750, onboard audio codec) is a credible home
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for the audio engine if PolyMeter ever grows into a real-time audio workstation.
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It boots playing a hardcoded 124-BPM 909 pattern (`pm_synth::SPIKE_PROGRAM`) out the Pod's audio
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jack, flashing the Daisy Seed's USER LED on each click.
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## What runs here
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- **Shared engine, verified on host.** The audio is produced by `pm_synth::Player` — the *exact*
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same code the host `synthrender` renders to `pm-daisy-preview.wav`. Listen to that WAV to hear
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what the hardware should play before you flash anything.
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- **Transport only is new.** This crate is a thin board-support binary: heap + board bring-up +
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the SAI audio-DMA interrupt feeding `Player::next_sample()` into stereo frames. Structure follows
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the `daisy` crate's `examples/audio.rs`.
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## ⚠️ Set the board revision (or you get silence)
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The Daisy Seed comes in revisions with different audio codecs. Pick the one on **your** Seed (check
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the sticker / silkscreen) — it's a Cargo feature:
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| Your Seed | Codec | Build with |
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|---|---|---|
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| Daisy Seed (original) | AK4556 | `./build.sh seed` |
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| **Daisy Seed 1.1** (default) | WM8731 | `./build.sh` (or `seed_1_1`) |
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| Daisy Seed 1.2 / Seed2 DFM | PCM3060 | `./build.sh seed_1_2` |
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## Build
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```sh
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./build.sh [revision] # containerized (pm-rust:2); produces pm-daisy.bin + pm-daisy.elf
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```
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## Flash — two options
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**A. Debug probe (recommended — gives you defmt logs over RTT):**
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A probe wired to the Seed's SWD pins (e.g. the Raspberry Pi Debug Probe you already use for
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pm-grid/pm-kit — see [`rust/probe-flash.md`](../probe-flash.md)).
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```sh
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probe-rs run --chip STM32H750VBTx pm-daisy.elf # or `cargo run --release` from this dir
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```
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**B. USB DFU (no probe needed):**
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Hold the Daisy's **BOOT** button, tap **RESET**, release BOOT — the Seed enumerates as STM32 system
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DFU. Then:
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```sh
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dfu-util -a 0 -s 0x08000000:leave -D pm-daisy.bin -d ,0483:df11
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```
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## Too big for 128 KB?
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The STM32H750 has only **128 KB internal flash**. If the linker reports a `FLASH` overflow, flash via
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the **Daisy Bootloader** to the 8 MB QSPI instead:
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1. Install the bootloader once at <https://flash.daisy.audio/> (Bootloader tab, v6.x).
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2. In [`memory.x`](memory.x), set `FLASH : ORIGIN = 0x90040000, LENGTH = 8M - 0x40000` (commented there).
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3. Rebuild, then enter the bootloader (tap BOOT within 2 s of reset; LED pulses) and:
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```sh
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dfu-util -a 0 -s 0x90040000:leave -D pm-daisy.bin -d ,0483:df11
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```
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## Beyond the spike (Pod extras, not yet wired)
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The Pod adds 2 buttons, 2 knobs, an encoder, and 2 RGB LEDs on Seed GPIO/ADC pins. Obvious next
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steps once audio is confirmed: knob → tempo, button → start/stop, RGB LED → beat/downbeat color.
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Wiring those needs the Pod pin map from Electrosmith's pinout (verify before assigning pins). This
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spike deliberately uses only the always-present Seed USER LED to avoid guessing the Pod pinout.
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