forks/RadioLibSmol
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

RadioLib - Now getTimeOnAir returns microseconds

Browse source
This commit is contained in:
Jaimi5 2022-06-25 14:04:44 +02:00
parent 298dbe8e5c
commit 19715ef204
1 changed files with 10 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
src/modules/SX127x/SX127x.cpp
View file

@ -148,7 +148,7 @@ int16_t SX127x::transmit(uint8_t* data, size_t len, uint8_t addr) {
uint32_t start = 0;
if(modem == RADIOLIB_SX127X_LORA) {
// calculate timeout (150 % of expected time-one-air)
uint32_t timeout = getTimeOnAir(len) * 1500.0;
uint32_t timeout = getTimeOnAir(len) * 1.5;
// start transmission
state = startTransmit(data, len, addr);
@ -1039,15 +1039,23 @@ int16_t SX127x::variablePacketLengthMode(uint8_t maxLen) {
}
uint32_t SX127x::getTimeOnAir(size_t len) {
float symbolLength = (float) (uint32_t(1) << _sf) / (float) _bw;
// Get symbol length in us
float symbolLength = (float) (uint32_t(1) << _sf) / (float) _bw * 1000;
// Get Low Data Rate optimization flag
float de = 0;
if (symbolLength >= 16.0) {
de = 1;
}
// Get explicit/implicit header enabled flag
float ih = (float) _mod->SPIgetRegValue(RADIOLIB_SX127X_REG_MODEM_CONFIG_1, 0, 0);
// Get CRC enabled flag
float crc = (float) (_mod->SPIgetRegValue(RADIOLIB_SX127X_REG_MODEM_CONFIG_2, 2, 2) >> 2);
// Get number of bits preamble
float n_pre = (float) ((_mod->SPIgetRegValue(RADIOLIB_SX127X_REG_PREAMBLE_MSB) << 8) | _mod->SPIgetRegValue(RADIOLIB_SX127X_REG_PREAMBLE_LSB));
// Get number of bits payload
float n_pay = 8.0 + max(ceil((8.0 * (float) len - 4.0 * (float) _sf + 28.0 + 16.0 * crc - 20.0 * ih) / (4.0 * (float) _sf - 8.0 * de)) * (float) _cr, 0.0);
// Get time-on-air in us
return ceil(symbolLength * (n_pre + n_pay + 4.25));
}