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[RF69] Added TRNG support

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This commit is contained in:
jgromes 2020-09-13 17:53:30 +02:00
parent b40ad5c2f7
commit ff8d9d672d
2 changed files with 26 additions and 0 deletions
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19
src/modules/RF69/RF69.cpp
View file

@ -764,6 +764,25 @@ void RF69::setRfSwitchPins(RADIOLIB_PIN_TYPE rxEn, RADIOLIB_PIN_TYPE txEn) {
_mod->setRfSwitchPins(rxEn, txEn);
}
uint8_t RF69::random() {
// set mode to Rx
setMode(RF69_RX);
// 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++) {
randByte |= ((_mod->SPIreadRegister(RF69_REG_RSSI_VALUE) & 0x01) << i);
}
// set mode to standby
setMode(RF69_STANDBY);
return(randByte);
}
int16_t RF69::config() {
int16_t state = ERR_NONE;

7
src/modules/RF69/RF69.h
View file

@ -820,6 +820,13 @@ class RF69: public PhysicalLayer {
*/
void setRfSwitchPins(RADIOLIB_PIN_TYPE rxEn, RADIOLIB_PIN_TYPE txEn);
/*!
\brief Get one truly random byte from RSSI noise.
\returns TRNG byte.
*/
uint8_t random();
#ifndef RADIOLIB_GODMODE
protected:
#endif