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[SX127x] disable syncword generation & detection, add method to set preamble polarity (#834)

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* allow syncword to be disabled if length is 0

* add method to change preamble polarity in FSK mode

* add new method 'setPreamblePolarity'

* move RADIOLIB_SX127X_PREAMBLE_POLARITY_55 from ::config to ::begin & ::beginFSK

* [SX127x] Remove FSK preamble config from LoRa init method

* [SX127x] Rename preamble inversion method

---------

Co-authored-by: BayCom GmbH <software@baycom.de>
Co-authored-by: jgromes <jan.gromes@gmail.com>
This commit is contained in:
BayCom GmbH 2023-09-29 14:27:31 +02:00 • committed by GitHub
parent 44bdf0dba4
commit d329c60906
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 38 additions and 4 deletions
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1
keywords.txt
View file

@ -124,6 +124,7 @@ setSyncWord KEYWORD2
setOutputPower KEYWORD2
setCurrentLimit KEYWORD2
setPreambleLength KEYWORD2
invertPreamble KEYWORD2
setGain KEYWORD2
getFrequencyError KEYWORD2
getRSSI KEYWORD2

34
src/modules/SX127x/SX127x.cpp
View file

@ -118,6 +118,10 @@ int16_t SX127x::beginFSK(uint8_t* chipVersions, uint8_t numVersions, float freqD
state = SX127x::setPreambleLength(preambleLength);
RADIOLIB_ASSERT(state);
// set preamble polarity
state = invertPreamble(false);
RADIOLIB_ASSERT(state);
// set default sync word
uint8_t syncWord[] = {0x12, 0xAD};
state = setSyncWord(syncWord, 2);
@ -782,6 +786,25 @@ int16_t SX127x::setPreambleLength(size_t preambleLength) {
return(RADIOLIB_ERR_UNKNOWN);
}
int16_t SX127x::invertPreamble(bool enable) {
// set mode to standby
int16_t state = setMode(RADIOLIB_SX127X_STANDBY);
RADIOLIB_ASSERT(state);
// check active modem
uint8_t modem = getActiveModem();
if(modem == RADIOLIB_SX127X_LORA) {
return(RADIOLIB_ERR_WRONG_MODEM);
} else if(modem == RADIOLIB_SX127X_FSK_OOK) {
// set preamble polarity
uint8_t polarity = enable ? RADIOLIB_SX127X_PREAMBLE_POLARITY_AA : RADIOLIB_SX127X_PREAMBLE_POLARITY_55;
state = this->mod->SPIsetRegValue(RADIOLIB_SX127X_REG_SYNC_CONFIG, polarity, 5, 5);
return(state);
}
return(RADIOLIB_ERR_UNKNOWN);
}
float SX127x::getFrequencyError(bool autoCorrect) {
int16_t modem = getActiveModem();
if(modem == RADIOLIB_SX127X_LORA) {
@ -999,6 +1022,13 @@ int16_t SX127x::setSyncWord(uint8_t* syncWord, size_t len) {
// check active modem
uint8_t modem = getActiveModem();
if(modem == RADIOLIB_SX127X_FSK_OOK) {
// disable sync word in case len is 0
if(len == 0) {
int16_t state = this->mod->SPIsetRegValue(RADIOLIB_SX127X_REG_SYNC_CONFIG, RADIOLIB_SX127X_SYNC_OFF, 4, 4);
return(state);
}
RADIOLIB_CHECK_RANGE(len, 1, 8, RADIOLIB_ERR_INVALID_SYNC_WORD);
// sync word must not contain value 0x00
@ -1428,10 +1458,6 @@ int16_t SX127x::configFSK() {
state |= this->mod->SPIsetRegValue(RADIOLIB_SX127X_REG_PACKET_CONFIG_2, RADIOLIB_SX127X_DATA_MODE_PACKET | RADIOLIB_SX127X_IO_HOME_OFF, 6, 5);
RADIOLIB_ASSERT(state);
// set preamble polarity
state =this->mod->SPIsetRegValue(RADIOLIB_SX127X_REG_SYNC_CONFIG, RADIOLIB_SX127X_PREAMBLE_POLARITY_55, 5, 5);
RADIOLIB_ASSERT(state);
// set FIFO threshold
state = this->mod->SPIsetRegValue(RADIOLIB_SX127X_REG_FIFO_THRESH, RADIOLIB_SX127X_TX_START_FIFO_NOT_EMPTY, 7, 7);
state |= this->mod->SPIsetRegValue(RADIOLIB_SX127X_REG_FIFO_THRESH, RADIOLIB_SX127X_FIFO_THRESH, 5, 0);

7
src/modules/SX127x/SX127x.h
View file

@ -878,6 +878,13 @@ class SX127x: public PhysicalLayer {
*/
int16_t setPreambleLength(size_t preambleLength) override;
/*!
\brief Invert FSK preamble polarity. The default (non-inverted) is 0x55, the inverted is 0xAA.
\param enable Preamble polarity in FSK mode - 0xAA when true, 0x55 when false.
\returns \ref status_codes
*/
int16_t invertPreamble(bool enable);
/*!
\brief Gets frequency error of the latest received packet.
\param autoCorrect When set to true, frequency will be automatically corrected.