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Drive CTX low first

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This commit is contained in:
Wessel Nieboer
2026-02-26 08:57:56 +01:00
committed by Wessel Nieboer
parent ac2aa03b09
commit 5a5568ed56
1 changed files with 6 additions and 3 deletions
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9
variants/rak3401/RAK3401Board.cpp
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@@ -28,15 +28,18 @@ void RAK3401Board::begin() {
// CTX (P0.31) selects TX(HIGH) vs RX(LOW) and also enables the 5V boost
// converter that powers the PA section (VCC1/VCC2).
// The LNA section (VSUP1/VCC0) runs on 3.3V and works with boost off.
//
// Drive CTX LOW first to prevent transient TX mode (Mode 2) while CSD/CPS
// are being enabled — the RAK13302 has no pull-downs on these pins.
pinMode(P_LORA_PA_EN, OUTPUT);
digitalWrite(P_LORA_PA_EN, LOW); // CTX=0: RX mode, boost off
pinMode(P_LORA_PA_CSD, OUTPUT);
digitalWrite(P_LORA_PA_CSD, HIGH); // CSD=1: enable FEM
pinMode(SX126X_POWER_EN, OUTPUT);
digitalWrite(SX126X_POWER_EN, HIGH); // CPS=1: enable TX/RX paths
pinMode(P_LORA_PA_EN, OUTPUT);
digitalWrite(P_LORA_PA_EN, LOW); // CTX=0: RX mode, boost off
delay(1); // SKY66122 turn-on settling time
}