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E22 SX1262 module now works!

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Thanks mostly to an old github comment by @beegee-tokyo the fix was easy
(comment here https://github.com/jgromes/RadioLib/issues/12#issuecomment-520450429)

We now set DIO3 to 2.4 volts to power the oscillator inside the E22
module (undocumented in the E22 docs)
This commit is contained in:
geeksville
2020-06-15 14:38:09 -07:00
parent 82169d4115
commit 477c62082d
4 changed files with 56 additions and 5 deletions
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44
src/mesh/SX1262Interface.cpp
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@@ -14,7 +14,19 @@ bool SX1262Interface::init()
{
RadioLibInterface::init();
float tcxoVoltage = 0; // None - we use an XTAL
#ifdef SX1262_RXEN // set not rx or tx mode
pinMode(SX1262_RXEN, OUTPUT);
pinMode(SX1262_TXEN, OUTPUT);
digitalWrite(SX1262_RXEN, LOW);
digitalWrite(SX1262_TXEN, LOW);
#endif
#ifndef SX1262_E22
float tcxoVoltage = 0; // None - we use an XTAL
#else
float tcxoVoltage =
2.4; // E22 uses DIO3 to power tcxo per https://github.com/jgromes/RadioLib/issues/12#issuecomment-520695575
#endif
bool useRegulatorLDO = false; // Seems to depend on the connection to pin 9/DCC_SW - if an inductor DCDC?
applyModemConfig();
@@ -23,6 +35,12 @@ bool SX1262Interface::init()
int res = lora.begin(freq, bw, sf, cr, syncWord, power, currentLimit, preambleLength, tcxoVoltage, useRegulatorLDO);
DEBUG_MSG("LORA init result %d\n", res);
#ifdef SX1262_RXEN
// lora.begin assumes Dio2 is RF switch control, which is not true if we are manually controlling RX and TX
if (res == ERR_NONE)
res = lora.setDio2AsRfSwitch(false);
#endif
if (res == ERR_NONE)
res = lora.setCRC(SX126X_LORA_CRC_ON);
@@ -81,6 +99,11 @@ void SX1262Interface::setStandby()
int err = lora.standby();
assert(err == ERR_NONE);
#ifdef SX1262_RXEN // we have RXEN/TXEN control - turn off RX and TX power
digitalWrite(SX1262_RXEN, LOW);
digitalWrite(SX1262_TXEN, LOW);
#endif
isReceiving = false; // If we were receiving, not any more
disableInterrupt();
completeSending(); // If we were sending, not anymore
@@ -94,6 +117,19 @@ void SX1262Interface::addReceiveMetadata(MeshPacket *mp)
mp->rx_snr = lora.getSNR();
}
/** start an immediate transmit
* We override to turn on transmitter power as needed.
*/
void SX1262Interface::startSend(MeshPacket *txp)
{
#ifdef SX1262_RXEN // we have RXEN/TXEN control - turn on TX power / off RX power
digitalWrite(SX1262_RXEN, LOW);
digitalWrite(SX1262_TXEN, HIGH);
#endif
RadioLibInterface::startSend(txp);
}
// For power draw measurements, helpful to force radio to stay sleeping
// #define SLEEP_ONLY
@@ -102,6 +138,12 @@ void SX1262Interface::startReceive()
#ifdef SLEEP_ONLY
sleep();
#else
#ifdef SX1262_RXEN // we have RXEN/TXEN control - turn on RX power / off TX power
digitalWrite(SX1262_RXEN, HIGH);
digitalWrite(SX1262_TXEN, LOW);
#endif
setStandby();
// int err = lora.startReceive();
int err = lora.startReceiveDutyCycleAuto(); // We use a 32 bit preamble so this should save some power by letting radio sit in