Add REGULATORY_GAIN configuration to remain within regulatory ERP limit #3836
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Hi there, is there any reason to wait on this PR? If myself or Unit Engineering continue to build and ship boards with built in PAs in front of the SX1262/other LoRa ICs, we need to introduce controls for non-licensed-hams to not be able to transmit at several watts above ISM regulatory limits. |
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Add REGULATORY_ prefix to LORA_REGIONCODE to prepare for more regulatory configuration options, and update comment block accordingly too. Signed-off-by: Andrew Yong <me@ndoo.sg>
REGULATORY_GAIN is the total system gain in dBm to subtract from the configured Tx power, to remain within regulatory ERP limit for non-licensed operators. This value should be set in variant.h and is PA gain + antenna gain (if system ships with an antenna). This is similar to antenna_gain/NL80211_ATTR_WIPHY_ANTENNA_GAIN/NL80211_ATTR_REG_RULE_POWER_MAX_ANT_GAIN setting in Linux Regulatory/OpenWrt/mac80211/nl80211/iw. Signed-off-by: Andrew Yong <me@ndoo.sg>
Specify REGULATORY_GAIN and SX126X_MAX_POWER to prevent exceeding regulatory and hardware limits (i.e. overloading the PA input) respectively. Also update the build flag to define EBYTE_E22_900M30S instead of just EBYTE_E22, since all the builds on the Discourse topic [New 1W DIY variant: Xiao nRF52840 + Ebyte E22-900M30S](https://meshtastic.discourse.group/t/new-1w-diy-variant-xiao-nrf52840-ebyte-e22-900m30s/7904) are using this module. That should make it clearer as well that the variant header file should be tweaked if DIY builds are using stronger (E22-900M33S, not commonly available at this time) or weaker (E22-900M22S, not popular for DIY builds due to lack of differentiation from ordinary SX1262 modules). Retain EBYTE_E22 flag alongside EBYTE_E22_900M30S build flag to prevent possible regressions in code paths generally intended for EBYTE E22 modules. Signed-off-by: Andrew Yong <me@ndoo.sg>
Signed-off-by: Andrew Yong <me@ndoo.sg>
…gain controls For example, Wi-Fi or BLE gain control (meshtastic#3962) Signed-off-by: Andrew Yong <me@ndoo.sg>
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REGULATORY_GAIN_LORA is the total LoRa gain in dBm to subtract from the configured Tx power, to remain within regulatory ERP limit for non-licensed operators.
This value should be set at build-time in variant.h and is PA gain + antenna gain (if the Meshtastic device is built with a fixed antenna, e.g. PCB trace antenna or non-removable whip).
This is similar to antenna_gain/NL80211_ATTR_WIPHY_ANTENNA_GAIN/NL80211_ATTR_REG_RULE_POWER_MAX_ANT_GAIN setting in Linux Regulatory/OpenWrt/mac80211/nl80211/iw.
The final transmit power is (myRegion->powerLimit - REGULATORY_GAIN) or the user's configured loraConfig.tx_power, whichever is lower.
This is implemented in DIY XIAO BLE EBYTE E22-900M30S variant as an example.