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Fixed RSSI indication confusion. Added SNR indication to received packets.

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This commit is contained in:
Mark Qvist 2019-11-07 15:26:21 +01:00
parent cd4587cca2
commit bad6f4bf75
9 changed files with 1572 additions and 1451 deletions
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10
Config.h
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@ -4,7 +4,7 @@
#define CONFIG_H
#define MAJ_VERS 0x01
#define MIN_VERS 0x0A
#define MIN_VERS 0x0B
#define MCU_328P 0x90
#define MCU_1284P 0x91
@ -62,10 +62,13 @@
// MCU independent configuration parameters
const long serial_baudrate = 115200;
const int rssi_offset = 292;
const int lora_rx_turnaround_ms = 50;
// SX1276 RSSI offset to get dBm value from
// packet RSSI register
const int rssi_offset = 157;
const int snr_offset = 128;
// Default LoRa settings
int lora_sf = 0;
int lora_cr = 5;
@ -85,6 +88,7 @@
int last_rssi = -292;
uint8_t last_rssi_raw = 0x00;
int8_t last_snr = 0;
size_t read_len = 0;
uint8_t seq = 0xFF;
uint8_t pbuf[MTU];

1
Framing.h
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@ -22,6 +22,7 @@
#define CMD_STAT_RX 0x21
#define CMD_STAT_TX 0x22
#define CMD_STAT_RSSI 0x23
#define CMD_STAT_SNR 0x24
#define CMD_BLINK 0x30
#define CMD_RANDOM 0x40

2
Libraries/Example.py
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@ -12,6 +12,8 @@ serialPort = "/dev/ttyUSB0"
# packet is received
def gotPacket(data, rnode):
print "Received a packet: "+data
print "RSSI: "+str(rnode.r_stat_rssi)+" dBm"
print "SNR: "+str(rnode.r_stat_snr)+" dBm"
# Create an RNode instance. This configures
# and powers up the radio.

28
Libraries/RNode.py
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@ -27,6 +27,7 @@ class KISS():
CMD_STAT_RX = chr(0x21)
CMD_STAT_TX = chr(0x22)
CMD_STAT_RSSI = chr(0x23)
CMD_STAT_SNR = chr(0x24)
CMD_BLINK = chr(0x30)
CMD_RANDOM = chr(0x40)
CMD_FW_VERSION = chr(0x50)
@ -66,7 +67,8 @@ class RNodeInterface():
LOG_DEBUG = 6
LOG_EXTREME = 7
RSSI_OFFSET = 292
RSSI_OFFSET = 157
SNR_OFFSET = 128
def __init__(self, callback, name, port, frequency = None, bandwidth = None, txpower = None, sf = None, cr = None, loglevel = -1, flow_control = True):
self.serial = None
@ -99,6 +101,7 @@ class RNodeInterface():
self.r_stat_rx = None
self.r_stat_tx = None
self.r_stat_rssi = None
self.r_stat_snr = None
self.r_random = None
self.packet_queue = []
@ -310,6 +313,7 @@ class RNodeInterface():
while self.serial.is_open:
if self.serial.in_waiting:
byte = self.serial.read(1)
last_read_ms = int(time.time()*1000)
if (in_frame and byte == KISS.FEND and command == KISS.CMD_DATA):
@ -412,7 +416,29 @@ class RNodeInterface():
self.r_stat_tx = ord(command_buffer[0]) << 24 | ord(command_buffer[1]) << 16 | ord(command_buffer[2]) << 8 | ord(command_buffer[3])
elif (command == KISS.CMD_STAT_RSSI):
if (byte == KISS.FESC):
escape = True
else:
if (escape):
if (byte == KISS.TFEND):
byte = KISS.FEND
if (byte == KISS.TFESC):
byte = KISS.FESC
escape = False
self.r_stat_rssi = ord(byte)-self.RSSI_OFFSET
elif (command == KISS.CMD_STAT_SNR):
if (byte == KISS.FESC):
escape = True
else:
if (escape):
if (byte == KISS.TFEND):
byte = KISS.FEND
if (byte == KISS.TFESC):
byte = KISS.FESC
escape = False
self.r_stat_snr = ord(byte)-self.SNR_OFFSET
elif (command == KISS.CMD_RANDOM):
self.r_random = ord(byte)
elif (command == KISS.CMD_ERROR):

15
LoRa.cpp
View File

@ -218,10 +218,19 @@ uint8_t LoRaClass::packetRssiRaw() {
}
int LoRaClass::packetRssi() {
int pkt_rssi = (int)readRegister(REG_PKT_RSSI_VALUE);
// TODO: change this to look at the actual model code
int pkt_rssi = (int)readRegister(REG_PKT_RSSI_VALUE) - RSSI_OFFSET;
int pkt_snr = packetSnr();
if (_frequency < 820E6) pkt_rssi -= 7;
pkt_rssi -= 157;
if (pkt_snr < 0) {
pkt_rssi += pkt_snr;
} else {
// Slope correction is (16/15)*pkt_rssi,
// this estimation looses one floating point
// operation, and should be precise enough.
pkt_rssi = (int)(1.066 * pkt_rssi);
}
return pkt_rssi;
}

2
LoRa.h
View File

@ -14,6 +14,8 @@
#define PA_OUTPUT_RFO_PIN 0
#define PA_OUTPUT_PA_BOOST_PIN 1
#define RSSI_OFFSET 157
class LoRaClass : public Stream {
public:
LoRaClass();

2937
Precompiled/rnode_firmware_latest.hex
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File diff suppressed because it is too large Load Diff

16
RNode_Firmware.ino
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@ -104,12 +104,14 @@ void receiveCallback(int packet_size) {
read_len = 0;
seq = sequence;
last_rssi = LoRa.packetRssi();
last_snr = LoRa.packetSnr();
getPacketData(packet_size);
} else if (isSplitPacket(header) && seq == sequence) {
// This is the second part of a split
// packet, so we add it to the buffer
// and set the ready flag.
last_rssi = (last_rssi+LoRa.packetRssi())/2;
last_snr = (last_snr+LoRa.packetSnr())/2;
getPacketData(packet_size);
seq = SEQ_UNSET;
ready = true;
@ -121,6 +123,7 @@ void receiveCallback(int packet_size) {
read_len = 0;
seq = sequence;
last_rssi = LoRa.packetRssi();
last_snr = LoRa.packetSnr();
getPacketData(packet_size);
} else if (!isSplitPacket(header)) {
// This is not a split packet, so we
@ -135,6 +138,7 @@ void receiveCallback(int packet_size) {
}
last_rssi = LoRa.packetRssi();
last_snr = LoRa.packetSnr();
getPacketData(packet_size);
ready = true;
}
@ -142,10 +146,8 @@ void receiveCallback(int packet_size) {
if (ready) {
// We first signal the RSSI of the
// recieved packet to the host.
Serial.write(FEND);
Serial.write(CMD_STAT_RSSI);
Serial.write((uint8_t)(last_rssi-rssi_offset));
Serial.write(FEND);
kiss_indicate_stat_rssi();
kiss_indicate_stat_snr();
// And then write the entire packet
Serial.write(FEND);
@ -168,10 +170,8 @@ void receiveCallback(int packet_size) {
// We first signal the RSSI of the
// recieved packet to the host.
Serial.write(FEND);
Serial.write(CMD_STAT_RSSI);
Serial.write((uint8_t)(last_rssi-rssi_offset));
Serial.write(FEND);
kiss_indicate_stat_rssi();
kiss_indicate_stat_snr();
// And then write the entire packet
Serial.write(FEND);

10
Utilities.h
View File

@ -133,7 +133,15 @@ void kiss_indicate_stat_rssi() {
uint8_t packet_rssi_val = (uint8_t)(last_rssi+rssi_offset);
Serial.write(FEND);
Serial.write(CMD_STAT_RSSI);
Serial.write(packet_rssi_val);
escapedSerialWrite(packet_rssi_val);
Serial.write(FEND);
}
void kiss_indicate_stat_snr() {
uint8_t packet_snr_val = (uint8_t)(last_snr+snr_offset);
Serial.write(FEND);
Serial.write(CMD_STAT_SNR);
escapedSerialWrite(packet_snr_val);
Serial.write(FEND);
}