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https://github.com/meshcore-dev/MeshCore.git
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70f1ad4aeb
The RAK13302 1W module uses a Skyworks SKY66122-11 front-end module with three digital control pins (CSD, CTX, CPS) that must be actively driven by the host MCU. The previous code only managed CTX (GPIO 31) — toggling it for TX/RX — but never initialized CSD (GPIO 24) or CPS (GPIO 21), leaving them floating with no pull-up/pull-down resistors on the PCB. With floating CSD and CPS, the SKY66122 was in an undefined operating mode: - The 30 dB TX PA may not have been reliably engaging - The 16 dB RX LNA was never reliably active, degrading receive sensitivity
55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
#include <Arduino.h>
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#include <Wire.h>
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#include "RAK3401Board.h"
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void RAK3401Board::begin() {
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NRF52BoardDCDC::begin();
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pinMode(PIN_VBAT_READ, INPUT);
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#ifdef PIN_USER_BTN
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pinMode(PIN_USER_BTN, INPUT_PULLUP);
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#endif
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#ifdef PIN_USER_BTN_ANA
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pinMode(PIN_USER_BTN_ANA, INPUT_PULLUP);
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#endif
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#if defined(PIN_BOARD_SDA) && defined(PIN_BOARD_SCL)
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Wire.setPins(PIN_BOARD_SDA, PIN_BOARD_SCL);
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#endif
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Wire.begin();
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pinMode(PIN_3V3_EN, OUTPUT);
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digitalWrite(PIN_3V3_EN, HIGH);
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// Initialize SKY66122-11 FEM on the RAK13302 module.
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// CSD (P0.24) and CPS (P0.21) must be HIGH for both TX and RX modes.
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// CTX (P0.31) selects TX(HIGH) vs RX(LOW) and also enables the 5V boost
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// converter that powers the PA section (VCC1/VCC2).
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// The LNA section (VSUP1/VCC0) runs on 3.3V and works with boost off.
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pinMode(P_LORA_PA_CSD, OUTPUT);
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digitalWrite(P_LORA_PA_CSD, HIGH); // CSD=1: enable FEM
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pinMode(SX126X_POWER_EN, OUTPUT);
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digitalWrite(SX126X_POWER_EN, HIGH); // CPS=1: enable TX/RX paths
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pinMode(P_LORA_PA_EN, OUTPUT);
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digitalWrite(P_LORA_PA_EN, LOW); // CTX=0: RX mode, boost off
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delay(1); // SKY66122 turn-on settling time
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}
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#ifdef NRF52_POWER_MANAGEMENT
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void RAK3401Board::initiateShutdown(uint8_t reason) {
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// Put SKY66122 in guaranteed <1 uA shutdown (Mode 4: CSD=0, CTX=0, CPS=0)
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digitalWrite(P_LORA_PA_EN, LOW); // CTX=0, boost off
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digitalWrite(SX126X_POWER_EN, LOW); // CPS=0
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digitalWrite(P_LORA_PA_CSD, LOW); // CSD=0
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// Disable 3V3 switched peripherals
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digitalWrite(PIN_3V3_EN, LOW);
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enterSystemOff(reason);
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}
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#endif
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