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[2.12] fix(v14): blank OLED RAM before display on, mute amp at boot - #7899
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pfeerick merged 1 commit intoOct 12, 2026
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- SSD1309: GDDRAM content is random at power up. Clear it before sending Display ON so no garbage is shown until the first refresh. - V14/V14LCD: Audio_EN (PE12) drives the AD8002D SD pin, which is pulled low (amp enabled) until the MCU drives it. Define it as AUDIO_MUTE_GPIO and mute early in boardInit() to avoid a pop when the DAC starts.
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Summary of changes:
Two boot-time issues on the HelloRadioSky V14 (SSD1309 OLED) / V14LCD.
1. OLED shows garbage at power on (V14, SSD1309)
SSD1309 GDDRAM content is random after power up.
lcdInitFinish()sends Display ON (0xAF) right afterlcdStart(), so the random RAM is shown at full contrast until the first LCD refresh. This became very visible after the brightness wrap fix (#7633), since boot contrast is no longer low.lcd_driver_spi.cpp: addlcdClearRam()(SSD1309 only) and call it before Display ON.2. Speaker pops ~0.5 s after power on (V14 / V14LCD)
On the V14 board,
Audio_EN(PE12) goes to the AD8002D SD pin (high = shutdown) through a series resistor, with a pull-down to GND. So the amp is enabled until the MCU drives PE12, and the DAC stepping to mid-rail indacInit()produces a pop. PE12 was never defined as a mute pin for V14.taranis/hal.h: defineAUDIO_MUTE_GPIO= PE12 forRADIO_V14/RADIO_V14LCD(same polarity/delays as the RadioMaster PE12 config, noINVERTED_MUTE_PIN).taranis/board.cpp: drive the mute pin high at the very start ofboardInit()so the amp stays off during the rest of the bring-up.Tested on V14 hardware: no more garbage on the OLED at boot, no pop at power on, audio works normally. Built V14 and V14LCD firmware.