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[Si443x] Added TRNG support

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This commit is contained in:
jgromes 2020-09-13 17:53:01 +02:00
parent 5376931b02
commit 5e1285783a
2 changed files with 26 additions and 0 deletions
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19
src/modules/Si443x/Si443x.cpp
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@ -553,6 +553,25 @@ void Si443x::setRfSwitchPins(RADIOLIB_PIN_TYPE rxEn, RADIOLIB_PIN_TYPE txEn) {
_mod->setRfSwitchPins(rxEn, txEn);
}
uint8_t Si443x::random() {
// set mode to Rx
_mod->SPIwriteRegister(SI443X_REG_OP_FUNC_CONTROL_1, SI443X_RX_ON | SI443X_XTAL_ON);
// 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(SI443X_REG_RSSI) & 0x01) << i);
}
// set mode to standby
standby();
return(randByte);
}
int16_t Si443x::setFrequencyRaw(float newFreq) {
// set mode to standby
int16_t state = standby();

7
src/modules/Si443x/Si443x.h
View file

@ -785,6 +785,13 @@ class Si443x: 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