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https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2026-08-14 11:53:42 +00:00
Sarah Rose
bf5ea0a004
* Add KISS TNC external app for APRS RX/TX over USB serial Adds a KISS TNC (Terminal Node Controller) app that bridges APRS packets between the HackRF radio and a connected PC over USB CDC serial using the KISS protocol. Features: - APRS receive at 144.390 MHz (configurable), decoding packets via the existing APRS RX baseband (PAPR.bin) - Received AX.25 frames forwarded to host as KISS-framed data over USB serial - KISS frames received from host transmitted as AFSK audio using the existing AFSK TX baseband (PAFT.bin) - Clean RX->TX->RX baseband switching with proper timing delays - USB connection status indicator with periodic refresh - Compatible with standard KISS TNC clients (Xastir, APRSISCE/32, Dire Wolf, etc.) Firmware changes required to support the external app: - baseband_api.cpp: mark set_aprs() __attribute__((used)) so it is retained by the linker for external app use - protocols/ax25: add make_frame_from_raw() to build NRZI bitstream from raw AX.25 bytes, marked __attribute__((used)) - usb_serial_host_to_device: add kiss_raw_handler hook to route incoming USB bytes directly to a registered callback, bypassing the shell; marked __attribute__((used)) - baseband/proc_aprsrx: add constructor that auto-configures at 1200 baud so external apps do not need to call set_aprs() at init * Address PR review: generic RAII USB handler, fix TX cutoff and buffer overflow - Replace KISS-specific set_kiss_raw_handler() in shared USB code with a generic UsbSerialInputHandler RAII class; any app can now register a handler via the ctor and it auto-clears in the dtor — no app-specific 'if' checks in shared code, no __attribute__((used)) needed - Remove __attribute__((used)) from set_aprs() — it is referenced directly by ui_aprs_rx.cpp so it will never be dead-stripped - Fix send_kiss_frame() buffer overflow: per-byte bounds check prevents 2-byte escape sequences from writing past the end of the output buffer - Replace fillOBuffer(TIME_INFINITE) with chOQWriteTimeout(TIME_IMMEDIATE) to drop bytes instead of blocking the event loop - Remove chThdSleepMilliseconds() calls from start_tx() and finish_tx() - Fix TX cutoff bug: call start_tx() directly from process_kiss_frame() instead of deferring via tx_pending_ flag (deferral caused kiss_idx_ to be 0 by the time start_tx() fired, producing an empty frame) * Move USB write into UsbSerialInputHandler class Add a write() method to UsbSerialInputHandler so all USB I/O (both input callback and output) is encapsulated in the class. KISS TNC now uses usb_input_handler_->write() instead of calling chOQWriteTimeout(&SUSBD1.oqueue, ...) directly, keeping raw USB details out of app code. * Address PR review: remove auto-configure from APRSRxProcessor, add timeout param to write() - Remove default_config from APRSRxProcessor() constructor; baseband should start unconfigured and wait for APRSRxConfigureMessage from the app side (already sent via baseband::set_aprs() in KISS TNC and APRS RX app) - Remove stray #include "stdio.h" from proc_aprsrx.cpp - Add systime_t timeout parameter with default TIME_IMMEDIATE to UsbSerialInputHandler::write() so callers can choose blocking behaviour