101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
#include <Arduino.h>
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#include <Wire.h>
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#include "RAK3401Board.h"
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#ifdef NRF52_POWER_MANAGEMENT
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// Static configuration for power management
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// Values set in variant.h defines
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const PowerMgtConfig power_config = {
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.lpcomp_ain_channel = PWRMGT_LPCOMP_AIN,
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.lpcomp_refsel = PWRMGT_LPCOMP_REFSEL,
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.voltage_bootlock = PWRMGT_VOLTAGE_BOOTLOCK
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};
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void RAK3401Board::initiateShutdown(uint8_t reason) {
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// Disable SKY66122 FEM (CSD+CPS LOW = shutdown, <1 uA)
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digitalWrite(SX126X_POWER_EN, LOW);
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// Disable 3V3 switched peripherals and 5V boost
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digitalWrite(PIN_3V3_EN, LOW);
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if (reason == SHUTDOWN_REASON_LOW_VOLTAGE ||
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reason == SHUTDOWN_REASON_BOOT_PROTECT) {
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configureVoltageWake(power_config.lpcomp_ain_channel, power_config.lpcomp_refsel);
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}
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enterSystemOff(reason);
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}
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#endif
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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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#ifdef NRF52_POWER_MANAGEMENT
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// Boot voltage protection check (may not return if voltage too low)
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checkBootVoltage(&power_config);
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#endif
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// WB_IO2 controls the shared 3V3_S peripheral rail and the RAK13302 boost
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// converter. Keep it enabled during normal operation. Cycling this rail as
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// part of radio recovery also resets fitted GPS and sensor modules and does
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// not provide a reliable reset of the SX1262 core.
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pinMode(PIN_3V3_EN, OUTPUT);
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digitalWrite(PIN_3V3_EN, HIGH);
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// CSD and CPS are tied together on the RAK13302 and routed to IO3. Keep the
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// FEM quiescent until the radio probe succeeds; enableRadioFrontend() then
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// restores it for normal RX/TX operation.
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pinMode(SX126X_POWER_EN, OUTPUT);
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digitalWrite(SX126X_POWER_EN, LOW);
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}
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bool RAK3401Board::recoverRadio() {
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// Quiesce the FEM, leave the shared peripheral rail and SPI controller
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// alone, and pulse the SX1262's dedicated NRST pin. BUSY must fall after a
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// physical reset before any SPI command is safe. Bounding that wait keeps a
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// missing or disconnected RAK13302 from trapping RadioLib in initialization.
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pinMode(SX126X_POWER_EN, OUTPUT);
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digitalWrite(SX126X_POWER_EN, LOW);
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pinMode(P_LORA_NSS, OUTPUT);
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digitalWrite(P_LORA_NSS, HIGH);
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pinMode(P_LORA_BUSY, INPUT);
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pinMode(P_LORA_RESET, OUTPUT);
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digitalWrite(P_LORA_RESET, LOW);
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// SX126x requires NRST low for at least 100 us. Keep the pulse explicit so
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// recovery does not accidentally depend on how long GPIO setup happens to
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// take in a particular Arduino core or optimization level.
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delay(1);
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digitalWrite(P_LORA_RESET, HIGH);
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const uint32_t reset_started = millis();
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while (digitalRead(P_LORA_BUSY) == HIGH) {
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serviceWatchdog();
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if (millis() - reset_started >= 100UL) return false;
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delay(1);
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}
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return true;
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}
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void RAK3401Board::enableRadioFrontend() {
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// CSD+CPS enable the SKY66122-11 FEM. SX1262 DIO2 performs the subsequent
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// TX/RX path switching in hardware.
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digitalWrite(SX126X_POWER_EN, HIGH);
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delay(1);
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}
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