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Added support for on-the-fly FIFO refilling in FSK.

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FSK can now transmit variable-length packets up to 255 long, as specified in the data sheet.
This commit is contained in:
Justin Stephens 2021-11-12 18:28:09 -05:00
parent d91c6d0712
commit 44b7930a01
2 changed files with 32 additions and 10 deletions
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38
src/modules/SX127x/SX127x.cpp
View file

@ -472,6 +472,15 @@ int16_t SX127x::startTransmit(uint8_t* data, size_t len, uint8_t addr) {
state |= _mod->SPIsetRegValue(SX127X_REG_FIFO_TX_BASE_ADDR, SX127X_FIFO_TX_BASE_ADDR_MAX);
state |= _mod->SPIsetRegValue(SX127X_REG_FIFO_ADDR_PTR, SX127X_FIFO_TX_BASE_ADDR_MAX);
// write packet to FIFO
_mod->SPIwriteRegisterBurst(SX127X_REG_FIFO, data, len);
// set RF switch (if present)
_mod->setRfSwitchState(LOW, HIGH);
// start transmission
state |= setMode(SX127X_TX);
} else if(modem == SX127X_FSK_OOK) {
// check packet length
if(len >= SX127X_MAX_PACKET_LENGTH_FSK) {
@ -494,16 +503,29 @@ int16_t SX127x::startTransmit(uint8_t* data, size_t len, uint8_t addr) {
if((filter == SX127X_ADDRESS_FILTERING_NODE) || (filter == SX127X_ADDRESS_FILTERING_NODE_BROADCAST)) {
_mod->SPIwriteRegister(SX127X_REG_FIFO, addr);
}
// Pre-load the FIFO with message before entering TX mode
uint8_t* ind = data;
_mod->SPIwriteRegisterBurst(SX127X_REG_FIFO, ind, min(len, 64));
ind += min(len, 64);
// set RF switch (if present) and start transmitting
_mod->setRfSwitchState(LOW, HIGH);
state |= setMode(SX127X_TX);
// Re-fill the FIFO on-the-fly as bytes are transmitted
while (ind < data + len) {
uint16_t flags = getIRQFlags();
bool fifo_full = flags >> 15;
// If FIFO not full, write another byte
if (!fifo_full) {
_mod->SPIwriteRegister(SX127X_REG_FIFO, *ind);
ind++;
}
}
}
// write packet to FIFO
_mod->SPIwriteRegisterBurst(SX127X_REG_FIFO, data, len);
// set RF switch (if present)
_mod->setRfSwitchState(LOW, HIGH);
// start transmission
state |= setMode(SX127X_TX);
RADIOLIB_ASSERT(state);
return(ERR_NONE);

4
src/modules/SX127x/SX127x.h
View file

@ -12,7 +12,7 @@
// SX127x physical layer properties
#define SX127X_FREQUENCY_STEP_SIZE 61.03515625
#define SX127X_MAX_PACKET_LENGTH 255
#define SX127X_MAX_PACKET_LENGTH_FSK 64
#define SX127X_MAX_PACKET_LENGTH_FSK 255
#define SX127X_CRYSTAL_FREQ 32.0
#define SX127X_DIV_EXPONENT 19
@ -601,7 +601,7 @@ class SX127x: public PhysicalLayer {
int16_t beginFSK(uint8_t chipVersion, float br, float freqDev, float rxBw, uint16_t preambleLength, bool enableOOK);
/*!
\brief Binary transmit method. Will transmit arbitrary binary data up to 255 bytes long using %LoRa or up to 63 bytes using FSK modem.
\brief Binary transmit method. Will transmit arbitrary binary data up to 255 bytes long.
For overloads to transmit Arduino String or C-string, see PhysicalLayer::transmit.
\param data Binary data that will be transmitted.