prosolis
3904703de1
Greenfield bare-metal firmware for a Pi Zero that lights a WS2812B strip above an 88-key keybed. The Pi is a USB MIDI gadget; the PC is the host and owns the piano connection and everything else. No network stack, no filesystem, no shell. Circle is a submodule pinned to Step51. Builds kernel.img (RASPPI=1, Zero / Zero W) and kernel7.img (RASPPI=2, Zero 2 / Zero 2 W); both coexist on one card, so either model runs from the same SD. Resolves two open assumptions from the plan against the Circle sources rather than by guessing: - CWS28XXStripe clocks the waveform out over SPI at a fixed 6.4MHz, one SPI byte per LED bit. On device 0 that puts data on MOSI = GPIO10 = physical pin 19. The implied 5.28ms frame time matches the plan's arithmetic. - The USB gadget lifecycle follows sample/29-miniorgan, which already carries a USB_GADGET_MODE path. Three details the hardware forces: - The gadget destroys and recreates its CUSBMIDIDevice across a USB suspend, so the kernel re-fetches it and clears notes held at that moment. Otherwise a chord would stay lit forever when the PC sleeps. - Rendering blocks for ~5.3ms of SPI traffic, so the MIDI packet handler only records state and the main loop draws. - MAX_LIT_KEYS complements the global brightness ceiling. 176 LEDs at full white would draw ~10.5A against a 6A supply; together the two clamps make that unreachable rather than merely unlikely. Every Phase 0 product decision has a named slot in firmware/config.h, all overridable at build time via EXTRADEFINE. tests/run.sh compiles the real pianoleds.cpp against stubbed Circle headers and checks the mapping, note-off paths, range clamping and both power clamps across nine configuration variants. It verifies arithmetic, not wiring, and does not replace bench-testing on real hardware. Claude-Session: https://claude.ai/code/session_01TVCB25LBsmeteWvaSMz4Ne
64 lines
1.6 KiB
Bash
Executable File
64 lines
1.6 KiB
Bash
Executable File
#!/bin/bash
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#
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# Builds the Piano LED Visualizer firmware for the Raspberry Pi Zero family.
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#
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# Produces both kernel images, which coexist on one SD card:
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#
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# kernel.img RASPPI=1 Pi Zero / Zero W (ARM1176)
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# kernel7.img RASPPI=2 Pi Zero 2 / Zero 2 W (Cortex-A7)
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#
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# The Pi picks the right one at boot, so the same card runs on either model.
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#
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set -e
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cd "$(dirname "$0")"
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ROOT=$PWD
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PREFIX=${PREFIX:-arm-none-eabi-}
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if ! command -v "${PREFIX}gcc" >/dev/null 2>&1; then
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echo "error: ${PREFIX}gcc not found." >&2
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echo " Debian/Ubuntu: sudo apt-get install gcc-arm-none-eabi" >&2
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exit 1
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fi
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if [ ! -f circle/Rules.mk ]; then
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echo "error: circle/ is empty. Run: git submodule update --init" >&2
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exit 1
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fi
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mkdir -p boot
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for SPEC in "1:kernel.img" "2:kernel7.img"; do
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RASPPI=${SPEC%%:*}
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IMAGE=${SPEC##*:}
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echo
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echo "=============== RASPPI=$RASPPI -> $IMAGE ==============="
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cd "$ROOT/circle"
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./configure -r "$RASPPI" -p "$PREFIX" -f
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./makeall clean >/dev/null
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./makeall -j "$(nproc)"
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# The WS28XX driver is an addon and is not built by makeall.
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make -C addon/WS28XX clean >/dev/null 2>&1 || true
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make -C addon/WS28XX -j "$(nproc)"
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cd "$ROOT/firmware"
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make clean >/dev/null 2>&1 || true
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make -j "$(nproc)"
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cp "$ROOT/firmware/$IMAGE" "$ROOT/boot/$IMAGE"
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echo "wrote boot/$IMAGE"
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done
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cd "$ROOT/firmware" && make clean >/dev/null 2>&1 || true
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echo
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echo "Built:"
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ls -l "$ROOT/boot"
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echo
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echo "Copy boot/*.img plus the Raspberry Pi firmware files (bootcode.bin,"
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echo "start.elf, fixup.dat) and cmdline.txt onto a FAT32 SD card."
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echo "See README.md for the full card layout."
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