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FrSkyX LBT: implement LBT instead of transmitting all the time

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Needs to be activated using FRSKYX_LBT for now.
This commit is contained in:
pascallanger
2019-10-27 13:20:53 +01:00
parent 0fddd9c119
commit 9f1bdc901c
4 changed files with 47 additions and 16 deletions
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47
Multiprotocol/FrSkyX_cc2500.ino
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@@ -276,6 +276,8 @@ static void __attribute__((unused)) FrSkyX_build_packet()
uint16_t ReadFrSkyX()
{
static bool transmit=true;
switch(state)
{
default:
@@ -300,38 +302,55 @@ uint16_t ReadFrSkyX()
case FRSKY_DATA1:
if ( prev_option != option )
{
CC2500_WriteReg(CC2500_0C_FSCTRL0,option); // Frequency offset hack
CC2500_WriteReg(CC2500_0C_FSCTRL0,option); //Frequency offset hack
prev_option = option ;
}
CC2500_SetTxRxMode(TX_EN);
FrSkyX_set_start(hopping_frequency_no);
CC2500_SetPower();
transmit=true;
#ifdef FRSKYX_LBT
CC2500_Strobe(CC2500_SIDLE);
state++;
return 210; //Wait for the freq to stabilize
case FRSKY_DATA2:
CC2500_Strobe(CC2500_SRX); //Acquire RSSI
state++;
return 20;
case FRSKY_DATA3:
uint8_t rssi;
rssi = CC2500_ReadReg(CC2500_34_RSSI | CC2500_READ_BURST); // 0.5 db/count, RSSI value read from the RSSI status register is a 2's complement number
if ((sub_protocol & 2) && rssi > 72 && rssi < 128) //LBT and RSSI between -36 to -8.5 dBm
{
transmit=false;
debugln("Busy %d %d",hopping_frequency_no,rssi);
}
#endif
CC2500_SetTxRxMode(TX_EN);
CC2500_SetPower();
CC2500_Strobe(CC2500_SFRX);
hopping_frequency_no = (hopping_frequency_no+FrSkyX_chanskip)%47;
CC2500_Strobe(CC2500_SIDLE);
CC2500_WriteData(packet, packet[0]+1);
state++;
if(transmit)
CC2500_WriteData(packet, packet[0]+1);
state=FRSKY_DATA4;
return 5200;
case FRSKY_DATA2:
case FRSKY_DATA4:
CC2500_SetTxRxMode(RX_EN);
CC2500_Strobe(CC2500_SIDLE);
state++;
return 200;
case FRSKY_DATA3:
case FRSKY_DATA5:
CC2500_Strobe(CC2500_SRX);
state++;
return 3100;
case FRSKY_DATA4:
case FRSKY_DATA6:
telemetry_set_input_sync(9000);
len = CC2500_ReadReg(CC2500_3B_RXBYTES | CC2500_READ_BURST) & 0x7F;
if (len && (len<=(0x0E + 3))) //Telemetry frame is 17
if (len && (len<=(0x0E + 3))) //Telemetry frame is 17
{
packet_count=0;
CC2500_ReadData(packet_in, len);
#if defined TELEMETRY
frsky_check_telemetry(packet_in,len); //check if valid telemetry packets
//parse telemetry packets here
//The same telemetry function used by FrSky(D8).
frsky_check_telemetry(packet_in,len); //Check and parse telemetry packets
#endif
}
else
@@ -355,7 +374,11 @@ uint16_t ReadFrSkyX()
}
FrSkyX_build_packet();
state = FRSKY_DATA1;
#ifdef FRSKYX_LBT
return 270;
#else
return 500;
#endif
}
return 1;
}