micheleandClaude Sonnet 5
fae2305164
Root cause of FM/DAB "stonata" audio: xtalCtun=31/nominal XTAL_FREQ defaults were never measured against this board's actual crystal (Abracon ABM8-19.200MHZ-10-1-U-T, CL=10pF, two external 15pF load caps). Fixed via CTUN trim by ear (31->0) plus a new live calibration loop that reads the Si4684's own FM_RSQ FREQOFF field (broadcast carriers are GPS-locked, so it's a free precision frequency reference) to trim XTAL_FREQ with no lab equipment. Converged to CTUN=0, XTAL_FREQ=19199750 Hz, residual -3/-4 ppm cross-checked on two stations. New tools/infrastructure (kept, not one-off): - Si4684Driver::recalibrateXtal() + POST /api/tuner/xtal-calibrate: live crystal re-trim without an ESP32 reflash. - FM_RSQ FREQOFF exposed as "freqoff_ppm" in GET /api/tuner/status. - tools/si4684_xtal_calibration.py: automates the trim loop. - tools/si4684_antenna_calibration.py: AN851 Appendix A ANTCAP/VARM/VARB sweep tool (same session, separate calibration). - CONFIG_ESP32_I2S_TEST_TONE (off by default): isolates Si4684-specific audio issues from shared-downstream ones by writing a tone directly over the I2S bus the Si4684 also uses. - SIGMA_WRITE_REGISTER_BLOCK/sigma_safeload_block now retry on NACK and verify via read-back instead of firing I2C writes blind. - FM de-emphasis set to European 50us (was left at the US 75us default). - DAB_ACF_ENABLE restored to its previous 0x0000 with a citation explaining why (tested the datasheet default of 0x0003, made things audibly worse). See docs/si4684-rf-investigation-report.md's 2026-08-23 entry for the full elimination chain and docs/TODO.md for follow-up work (persisting calibration results to EEPROM instead of requiring a firmware edit). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
20 lines
729 B
CMake
20 lines
729 B
CMake
idf_component_register(
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SRCS
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"main.cpp"
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"hardware_bootstrap.cpp"
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"web_radio_stream.cpp"
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"esp32_i2s_sink.cpp"
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"phone_stream.cpp"
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"antenna_calibration.cpp"
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"$<$<BOOL:${CONFIG_TEST_FIRMWARE}>:test_firmware.cpp>"
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"$<$<BOOL:${CONFIG_I2S_SDATA_PROBE}>:i2s_sdata_probe.cpp>"
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"$<$<BOOL:${CONFIG_ESP32_I2S_TEST_TONE}>:esp32_i2s_test_tone.cpp>"
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INCLUDE_DIRS "."
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REQUIRES core net secure_store adau1701 si4684 tuner audio bt1035 bluetooth station integration ota eeprom24aa webradio driver
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PRIV_REQUIRES esp_timer esp_http_client
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)
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if(CONFIG_TEST_FIRMWARE)
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set(EXTRA_COMPONENT_DIRS "${EXTRA_COMPONENT_DIRS}" "${CMAKE_CURRENT_SOURCE_DIR}")
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endif()
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