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[Si443x] Fixed preamble configuration (#199)

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This commit is contained in:
jgromes 2021-07-25 20:49:47 +02:00
parent 33508e4fa7
commit a556024a56
1 changed files with 7 additions and 12 deletions
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19
src/modules/Si443x/Si443x.cpp
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@ -93,11 +93,6 @@ int16_t Si443x::transmit(uint8_t* data, size_t len, uint8_t addr) {
// set mode to standby
standby();
// the next transmission will timeout without the following
_mod->SPIwriteRegister(SI443X_REG_INTERRUPT_ENABLE_2, 0x00);
_mod->SPIsetRegValue(SI443X_REG_MODULATION_MODE_CONTROL_2, SI443X_TX_DATA_SOURCE_FIFO, 5, 4);
state = setFrequencyRaw(_freq);
return(state);
}
@ -486,19 +481,19 @@ int16_t Si443x::setSyncWord(uint8_t* syncWord, size_t len) {
}
int16_t Si443x::setPreambleLength(uint8_t preambleLen) {
// Si443x configures preamble length in bytes
if(preambleLen % 8 != 0) {
// Si443x configures preamble length in 4-bit nibbles
if(preambleLen % 4 != 0) {
return(ERR_INVALID_PREAMBLE_LENGTH);
}
// set default preamble length
uint8_t preLenBytes = preambleLen / 8;
int16_t state = _mod->SPIsetRegValue(SI443X_REG_PREAMBLE_LENGTH, preLenBytes);
uint8_t preLenNibbles = preambleLen / 4;
int16_t state = _mod->SPIsetRegValue(SI443X_REG_PREAMBLE_LENGTH, preLenNibbles);
RADIOLIB_ASSERT(state);
// set default preamble detection threshold to 50% of preamble length (in units of 4 bits)
uint8_t preThreshold = preambleLen / 4;
return(_mod->SPIsetRegValue(SI443X_REG_PREAMBLE_DET_CONTROL, preThreshold << 4, 7, 3));
// set default preamble detection threshold to 5/8 of preamble length (in units of 4 bits)
uint8_t preThreshold = 5*preLenNibbles / 8;
return(_mod->SPIsetRegValue(SI443X_REG_PREAMBLE_DET_CONTROL, preThreshold << 3, 7, 3));
}
size_t Si443x::getPacketLength(bool update) {