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[CC1101] Added TRNG support

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This commit is contained in:
jgromes 2020-09-13 17:53:37 +02:00
parent ff8d9d672d
commit 35f02ed402
2 changed files with 39 additions and 13 deletions
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45
src/modules/CC1101/CC1101.cpp
View file

@ -554,7 +554,7 @@ int16_t CC1101::setNodeAddress(uint8_t nodeAddr, uint8_t numBroadcastAddrs) {
int16_t CC1101::disableAddressFiltering() {
// disable address filtering
int16_t state = _mod->SPIsetRegValue(CC1101_REG_PKTCTRL1, CC1101_ADR_CHK_NONE, 1, 0);
int16_t state = SPIsetRegValue(CC1101_REG_PKTCTRL1, CC1101_ADR_CHK_NONE, 1, 0);
RADIOLIB_ASSERT(state);
// set node address to default (0x00)
@ -610,9 +610,9 @@ uint8_t CC1101::getLQI() const {
size_t CC1101::getPacketLength(bool update) {
if(!_packetLengthQueried && update) {
if (_packetLengthConfig == CC1101_LENGTH_CONFIG_VARIABLE) {
_packetLength = _mod->SPIreadRegister(CC1101_REG_FIFO);
_packetLength = SPIreadRegister(CC1101_REG_FIFO);
} else {
_packetLength = _mod->SPIreadRegister(CC1101_REG_PKTLEN);
_packetLength = SPIreadRegister(CC1101_REG_PKTLEN);
}
_packetLengthQueried = true;
@ -693,10 +693,10 @@ int16_t CC1101::setDataShaping(uint8_t sh) {
// set data shaping
switch(sh) {
case RADIOLIB_SHAPING_NONE:
state = _mod->SPIsetRegValue(CC1101_REG_MDMCFG2, CC1101_MOD_FORMAT_2_FSK, 6, 4);
state = SPIsetRegValue(CC1101_REG_MDMCFG2, CC1101_MOD_FORMAT_2_FSK, 6, 4);
break;
case RADIOLIB_SHAPING_0_5:
state = _mod->SPIsetRegValue(CC1101_REG_MDMCFG2, CC1101_MOD_FORMAT_GFSK, 6, 4);
state = SPIsetRegValue(CC1101_REG_MDMCFG2, CC1101_MOD_FORMAT_GFSK, 6, 4);
break;
default:
return(ERR_INVALID_DATA_SHAPING);
@ -712,17 +712,17 @@ int16_t CC1101::setEncoding(uint8_t encoding) {
// set encoding
switch(encoding) {
case RADIOLIB_ENCODING_NRZ:
state = _mod->SPIsetRegValue(CC1101_REG_MDMCFG2, CC1101_MANCHESTER_EN_OFF, 3, 3);
state = SPIsetRegValue(CC1101_REG_MDMCFG2, CC1101_MANCHESTER_EN_OFF, 3, 3);
RADIOLIB_ASSERT(state);
return(_mod->SPIsetRegValue(CC1101_REG_PKTCTRL0, CC1101_WHITE_DATA_OFF, 6, 6));
return(SPIsetRegValue(CC1101_REG_PKTCTRL0, CC1101_WHITE_DATA_OFF, 6, 6));
case RADIOLIB_ENCODING_MANCHESTER:
state = _mod->SPIsetRegValue(CC1101_REG_MDMCFG2, CC1101_MANCHESTER_EN_ON, 3, 3);
state = SPIsetRegValue(CC1101_REG_MDMCFG2, CC1101_MANCHESTER_EN_ON, 3, 3);
RADIOLIB_ASSERT(state);
return(_mod->SPIsetRegValue(CC1101_REG_PKTCTRL0, CC1101_WHITE_DATA_OFF, 6, 6));
return(SPIsetRegValue(CC1101_REG_PKTCTRL0, CC1101_WHITE_DATA_OFF, 6, 6));
case RADIOLIB_ENCODING_WHITENING:
state = _mod->SPIsetRegValue(CC1101_REG_MDMCFG2, CC1101_MANCHESTER_EN_OFF, 3, 3);
state = SPIsetRegValue(CC1101_REG_MDMCFG2, CC1101_MANCHESTER_EN_OFF, 3, 3);
RADIOLIB_ASSERT(state);
return(_mod->SPIsetRegValue(CC1101_REG_PKTCTRL0, CC1101_WHITE_DATA_ON, 6, 6));
return(SPIsetRegValue(CC1101_REG_PKTCTRL0, CC1101_WHITE_DATA_ON, 6, 6));
default:
return(ERR_INVALID_ENCODING);
}
@ -732,6 +732,25 @@ void CC1101::setRfSwitchPins(RADIOLIB_PIN_TYPE rxEn, RADIOLIB_PIN_TYPE txEn) {
_mod->setRfSwitchPins(rxEn, txEn);
}
uint8_t CC1101::random() {
// set mode to Rx
SPIsendCommand(CC1101_CMD_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 |= ((SPIreadRegister(CC1101_REG_RSSI) & 0x01) << i);
}
// set mode to standby
SPIsendCommand(CC1101_CMD_IDLE);
return(randByte);
}
int16_t CC1101::config() {
// Reset the radio. Registers may be dirty from previous usage.
SPIsendCommand(CC1101_CMD_RESET);
@ -795,11 +814,11 @@ int16_t CC1101::setPacketMode(uint8_t mode, uint8_t len) {
}
// set PKTCTRL0.LENGTH_CONFIG
int16_t state = _mod->SPIsetRegValue(CC1101_REG_PKTCTRL0, mode, 1, 0);
int16_t state = SPIsetRegValue(CC1101_REG_PKTCTRL0, mode, 1, 0);
RADIOLIB_ASSERT(state);
// set length to register
state = _mod->SPIsetRegValue(CC1101_REG_PKTLEN, len);
state = SPIsetRegValue(CC1101_REG_PKTLEN, len);
RADIOLIB_ASSERT(state);
// update the cached value

7
src/modules/CC1101/CC1101.h
View file

@ -874,6 +874,13 @@ class CC1101: 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
private:
#endif