Resolvesmeshtastic/firmware#8417
Given pins 41 and 42 are used for GPS on this version it would seem using those pins, though drop in compatible with the V3 board, would render the GNSS socket unusable unless one used the inconvenient OLED pins on the forward edge of the board.
* Introduce non-linear TX_GAIN_LORA
Previously, our TX_GAIN_LORA setting was a single number, intended
to represent the signal gain going through a power amp (plus or minus
antenna, attenuator, and other parts of the RF chain).
It turns out the relationship between the input power (i.e. from an SX1262)
and total output power is often non-linear. While we fudged a 1dBm difference
here and there with existing chips, the Heltec v4 has a 5dBm difference in gain
depending on which end of the input power (and frequency) you are at.
To allow people to run their Heltec v4 at max power when legal, and future
proof our code, this patch introduced an optional array-based TX_GAIN_LORA.
Define NUM_PA_POINTS and set TX_GAIN_LORA to gain values for a given input
power in 1dBm increments, and all will work.
For linear systems, just continue to define TX_GAIN_LORA as a number.
Fixes https://github.com/meshtastic/firmware/issues/8070
* Remove temporary power limit on heltec v4
* Add function RadioLibInterface::checkOutputPower
* Ensure SX126x reaches minimum supported power.
* Keep it simple, instead.
