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RadioLib - FSK getTimeOnAir, crc bits and packet length configuration fixed

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This commit is contained in:
Jaimi5 2022-07-01 17:03:02 +02:00
parent 3b305591d2
commit 46919cb249
1 changed files with 11 additions and 6 deletions
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17
src/modules/SX127x/SX127x.cpp
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@ -1065,13 +1065,18 @@ uint32_t SX127x::getTimeOnAir(size_t len) {
float n_pre = (float) ((_mod->SPIgetRegValue(RADIOLIB_SX127X_REG_PREAMBLE_MSB_FSK) << 8) | _mod->SPIgetRegValue(RADIOLIB_SX127X_REG_PREAMBLE_LSB_FSK)) * 8;
//Get the number of bits of the sync word
float n_syncWord = (float) (_mod->SPIgetRegValue(RADIOLIB_SX127X_REG_SYNC_CONFIG, 2, 0) + 1) * 8;
//Get CRC enabled flag
float crc = (float) (_mod->SPIgetRegValue(RADIOLIB_SX127X_REG_PACKET_CONFIG_1, 4, 4) >> 2);
//Get payload length
if (_packetLengthConfig == RADIOLIB_SX127X_PACKET_FIXED)
len = _mod->SPIgetRegValue(RADIOLIB_SX127X_REG_PAYLOAD_LENGTH_FSK);
//Get CRC bits
float crc = (_mod->SPIgetRegValue(RADIOLIB_SX127X_REG_PACKET_CONFIG_1, 4, 4) == RADIOLIB_SX127X_CRC_ON) * 16;
// Calculate time-on-air in us ((length in bytes) * (8 bits / 1 byte)) / ((Bit Rate in kbps) * (1000 bps / 1 kbps)) * (1000000 us in 1 sec)
if (_packetLengthConfig == RADIOLIB_SX127X_PACKET_FIXED) {
//If Packet size fixed -> len = fixed packet length
len = _mod->SPIgetRegValue(RADIOLIB_SX127X_REG_PAYLOAD_LENGTH_FSK);
} else {
//if packet variable -> Add 1 extra byte for payload length
len += 1;
}
// Calculate time-on-air in us {[(length in bytes) * (8 bits / 1 byte)] / [(Bit Rate in kbps) * (1000 bps / 1 kbps)]} * (1000000 us in 1 sec)
return (uint32_t) (((crc + n_syncWord + n_pre + (float) (len * 8)) / (_br * 1000.0)) * 1000000.0);
} else {
return(RADIOLIB_ERR_UNKNOWN);