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[SX126x] Added TRNG support

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This commit is contained in:
jgromes 2020-09-13 17:53:23 +02:00
parent 04195ee0d2
commit b40ad5c2f7
2 changed files with 29 additions and 1 deletions
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21
src/modules/SX126x/SX126x.cpp
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@ -1173,6 +1173,27 @@ int16_t SX126x::autoLDRO() {
return(ERR_NONE);
}
uint8_t SX126x::random() {
// set mode to Rx
setRx(SX126X_RX_TIMEOUT_INF);
// wait a bit for the RSSI reading to stabilise
Module::delay(10);
// read RSSI value 8 times, always keep just the least significant bit
uint8_t randByte = 0x00;
for(uint8_t i = 0; i < 8; i++) {
uint8_t val = 0x00;
readRegister(SX126X_REG_RANDOM_NUMBER_0, &val, sizeof(uint8_t));
randByte |= ((val & 0x01) << i);
}
// set mode to standby
standby();
return(randByte);
}
int16_t SX126x::setTCXO(float voltage, uint32_t delay) {
// set mode to standby
standby();

9
src/modules/SX126x/SX126x.h
View file

@ -854,7 +854,7 @@ class SX126x: public PhysicalLayer {
/*!
\brief Forces LoRa low data rate optimization. Only available in LoRa mode. After calling this method, LDRO will always be set to
the provided value, regardless of symbol length. To re-enable automatic LDRO configuration, call SX1278::autoLDRO()
the provided value, regardless of symbol length. To re-enable automatic LDRO configuration, call SX126x::autoLDRO()
\param enable Force LDRO to be always enabled (true) or disabled (false).
@ -870,6 +870,13 @@ class SX126x: public PhysicalLayer {
*/
int16_t autoLDRO();
/*!
\brief Get one truly random byte from RSSI noise.
\returns TRNG byte.
*/
uint8_t random();
#ifndef RADIOLIB_GODMODE
protected:
#endif