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Improved channel access behaviour. Improved LoRa PHY parameter setup. Added parameter reporting to host connection.

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master
Mark Qvist 1 year ago
parent 2bf23fe810
commit d45f03b433
4 changed files with 96 additions and 44 deletions
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  1. 36
      Config.h
  2. 1
      Framing.h
  3. 60
      RNode_Firmware.ino
  4. 43
      Utilities.h

36
Config.h
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@ -289,17 +289,24 @@
// MCU independent configuration parameters
const long serial_baudrate = 115200;
const int lora_rx_turnaround_ms = 50;
uint8_t csma_p = 0;
float csma_p_min = 0.1;
float csma_p_max = 0.8;
int csma_slot_ms = lora_rx_turnaround_ms;
// SX1276 RSSI offset to get dBm value from
// packet RSSI register
const int rssi_offset = 157;
// Default LoRa settings
const int lora_rx_turnaround_ms = 66;
const int lora_post_tx_yield_slots = 6;
uint32_t post_tx_yield_timeout = 0;
#define LORA_PREAMBLE_SYMBOLS_HW 4
#define LORA_PREAMBLE_SYMBOLS_MIN 6
#define LORA_PREAMBLE_TARGET_MS 15
#define LORA_CAD_SYMBOLS 3
int csma_slot_ms = 50;
float csma_p_min = 0.1;
float csma_p_max = 0.8;
uint8_t csma_p = 0;
int lora_sf = 0;
int lora_cr = 5;
int lora_txp = 0xFF;
@ -370,18 +377,19 @@
float lt_airtime_limit = 0.0;
bool airtime_lock = false;
bool stat_signal_detected = false;
bool stat_signal_synced = false;
bool stat_rx_ongoing = false;
bool dcd = false;
bool dcd_led = false;
bool dcd_waiting = false;
long dcd_wait_until = 0;
uint16_t dcd_count = 0;
uint16_t dcd_threshold = 6;
bool stat_signal_detected = false;
bool stat_signal_synced = false;
bool stat_rx_ongoing = false;
bool dcd = false;
bool dcd_led = false;
bool dcd_waiting = false;
long dcd_wait_until = 0;
uint16_t dcd_count = 0;
uint16_t dcd_threshold = 2;
uint32_t status_interval_ms = STATUS_INTERVAL_MS;
uint32_t last_status_update = 0;
uint32_t last_dcd = 0;
// Status flags
const uint8_t SIG_DETECT = 0x01;

1
Framing.h
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@ -43,6 +43,7 @@
#define CMD_STAT_RSSI 0x23
#define CMD_STAT_SNR 0x24
#define CMD_STAT_CHTM 0x25
#define CMD_STAT_PHYPRM 0x26
#define CMD_BLINK 0x30
#define CMD_RANDOM 0x40

60
RNode_Firmware.ino
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@ -318,7 +318,6 @@ bool startRadio() {
setBandwidth();
setSpreadingFactor();
setCodingRate();
setPreamble();
getFrequency();
LoRa.enableCrc();
@ -398,6 +397,7 @@ void flushQueue(void) {
lora_receive();
led_tx_off();
post_tx_yield_timeout = millis()+(lora_post_tx_yield_slots*csma_slot_ms);
}
queue_height = 0;
@ -925,20 +925,30 @@ void updateModemStatus() {
if (status & RX_ONGOING == RX_ONGOING) { stat_rx_ongoing = true; } else { stat_rx_ongoing = false; }
if (stat_signal_detected || stat_signal_synced || stat_rx_ongoing) {
if (dcd_count < dcd_threshold) {
dcd_count++;
dcd = true;
} else {
dcd = true;
dcd_led = true;
if (stat_rx_ongoing) {
if (dcd_count < dcd_threshold) {
dcd_count++;
} else {
last_dcd = last_status_update;
dcd_led = true;
dcd = true;
}
}
} else {
if (dcd_count > 0) {
dcd_count = 0;
#define DCD_LED_STEP_D 3
if (dcd_count == 0) {
dcd_led = false;
} else if (dcd_count > DCD_LED_STEP_D) {
dcd_count -= DCD_LED_STEP_D;
} else {
dcd_count = 0;
}
if (last_status_update > last_dcd+csma_slot_ms) {
dcd = false;
dcd_led = false;
dcd_count = 0;
}
dcd = false;
}
if (dcd_led) {
@ -1110,8 +1120,6 @@ void validate_status() {
void loop() {
if (radio_online) {
checkModemStatus();
#if MCU_VARIANT == MCU_ESP32
if (packet_ready) {
portENTER_CRITICAL(&update_lock);
@ -1128,22 +1136,26 @@ void loop() {
if (lt_airtime_limit != 0.0 && longterm_airtime >= lt_airtime_limit) airtime_lock = true;
#endif
checkModemStatus();
if (!airtime_lock) {
if (queue_height > 0) {
#if MCU_VARIANT == MCU_ESP32
long check_time = millis();
if (check_time > post_tx_yield_timeout) {
if (dcd_waiting && (check_time >= dcd_wait_until)) { dcd_waiting = false; }
if (!dcd_waiting) {
for (uint8_t dcd_i = 0; dcd_i < dcd_threshold*2; dcd_i++) {
delay(STATUS_INTERVAL_MS); updateModemStatus();
}
if (dcd_waiting && (millis() >= dcd_wait_until)) { dcd_waiting = false; }
if (!dcd_waiting) {
updateModemStatus();
long check_time = millis();
if (!dcd) {
uint8_t csma_r = (uint8_t)random(256);
if (csma_p >= csma_r) {
flushQueue();
} else {
dcd_waiting = true;
dcd_wait_until = check_time+csma_slot_ms;
if (!dcd) {
uint8_t csma_r = (uint8_t)random(256);
if (csma_p >= csma_r) {
flushQueue();
} else {
dcd_waiting = true;
dcd_wait_until = millis()+csma_slot_ms;
}
}
}
}

43
Utilities.h
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@ -732,6 +732,29 @@ void kiss_indicate_channel_stats() {
#endif
}
void kiss_indicate_phy_stats() {
#if MCU_VARIANT == MCU_ESP32
uint16_t lst = (uint16_t)(lora_symbol_time_ms*1000);
uint16_t lsr = (uint16_t)(lora_symbol_rate);
uint16_t prs = (uint16_t)(lora_preamble_symbols+4);
uint16_t prt = (uint16_t)((lora_preamble_symbols+4)*lora_symbol_time_ms);
uint16_t cst = (uint16_t)(csma_slot_ms);
serial_write(FEND);
serial_write(CMD_STAT_PHYPRM);
escaped_serial_write(lst>>8);
escaped_serial_write(lst);
escaped_serial_write(lsr>>8);
escaped_serial_write(lsr);
escaped_serial_write(prs>>8);
escaped_serial_write(prs);
escaped_serial_write(prt>>8);
escaped_serial_write(prt);
escaped_serial_write(cst>>8);
escaped_serial_write(cst);
serial_write(FEND);
#endif
}
void kiss_indicate_btpin() {
#if HAS_BLUETOOTH
serial_write(FEND);
@ -905,6 +928,11 @@ inline uint8_t packetSequence(uint8_t header) {
return header >> 4;
}
void setPreamble() {
if (radio_online) LoRa.setPreambleLength(lora_preamble_symbols);
kiss_indicate_phy_stats();
}
void updateBitrate() {
#if MCU_VARIANT == MCU_ESP32
if (radio_online) {
@ -912,7 +940,15 @@ void updateBitrate() {
lora_symbol_time_ms = (1.0/lora_symbol_rate)*1000.0;
lora_bitrate = (uint32_t)(lora_sf * ( (4.0/(float)lora_cr) / ((float)(pow(2, lora_sf))/((float)lora_bw/1000.0)) ) * 1000.0);
lora_us_per_byte = 1000000.0/((float)lora_bitrate/8.0);
csma_slot_ms = lora_symbol_time_ms*10;
// csma_slot_ms = lora_symbol_time_ms*10;
float target_preamble_symbols = (LORA_PREAMBLE_TARGET_MS/lora_symbol_time_ms)-LORA_PREAMBLE_SYMBOLS_HW;
if (target_preamble_symbols < LORA_PREAMBLE_SYMBOLS_MIN) {
target_preamble_symbols = LORA_PREAMBLE_SYMBOLS_MIN;
} else {
target_preamble_symbols = ceil(target_preamble_symbols);
}
lora_preamble_symbols = (long)target_preamble_symbols;
setPreamble();
} else {
lora_bitrate = 0;
}
@ -929,11 +965,6 @@ void setCodingRate() {
updateBitrate();
}
void setPreamble() {
if (radio_online) LoRa.setPreambleLength(lora_preamble_symbols);
updateBitrate();
}
void set_implicit_length(uint8_t len) {
implicit_l = len;
if (implicit_l != 0) {

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