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
60 lines
1.1 KiB
C++
60 lines
1.1 KiB
C++
//
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// kernel.h
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//
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#ifndef _kernel_h
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#define _kernel_h
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#include <circle/actled.h>
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#include <circle/koptions.h>
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#include <circle/devicenameservice.h>
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#include <circle/serial.h>
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#include <circle/exceptionhandler.h>
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#include <circle/interrupt.h>
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#include <circle/timer.h>
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#include <circle/logger.h>
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#include <circle/types.h>
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#include <circle/usb/usbcontroller.h>
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#include <circle/usb/usbmidi.h>
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#include "pianoleds.h"
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enum TShutdownMode
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{
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ShutdownNone,
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ShutdownHalt,
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ShutdownReboot
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};
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class CKernel
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{
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public:
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CKernel (void);
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~CKernel (void);
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boolean Initialize (void);
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TShutdownMode Run (void);
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private:
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// Pick up the MIDI device after the host has enumerated us, and again
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// after every re-enumeration.
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void UpdateMIDIDevice (void);
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private:
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// do not change this order
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CActLED m_ActLED;
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CKernelOptions m_Options;
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CDeviceNameService m_DeviceNameService;
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CSerialDevice m_Serial;
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CExceptionHandler m_ExceptionHandler;
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CInterruptSystem m_Interrupt;
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CTimer m_Timer;
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CLogger m_Logger;
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CUSBController *m_pUSB;
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CUSBMIDIDevice *m_pMIDIDevice;
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CPianoLEDs m_PianoLEDs;
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};
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#endif
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