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Implemented adaptive CSMA scheme

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This commit is contained in:
Mark Qvist 2023-09-14 22:32:26 +02:00
parent 9fd379486d
commit b61bead60a
4 changed files with 60 additions and 30 deletions
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18
Config.h
View File

@ -290,7 +290,10 @@
// MCU independent configuration parameters
const long serial_baudrate = 115200;
const int lora_rx_turnaround_ms = 50;
const int csma_slot_ms = lora_rx_turnaround_ms;
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
@ -311,11 +314,11 @@
// Operational variables
bool radio_locked = true;
bool radio_online = false;
bool community_fw = true;
bool community_fw = true;
bool hw_ready = false;
bool radio_error = false;
bool disp_ready = false;
bool pmu_ready = false;
bool radio_error = false;
bool disp_ready = false;
bool pmu_ready = false;
bool promisc = false;
bool implicit = false;
uint8_t implicit_l = 0;
@ -370,11 +373,12 @@
bool stat_signal_detected = false;
bool stat_signal_synced = false;
bool stat_rx_ongoing = false;
bool dcd = 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 = 15;
uint16_t dcd_threshold = 6;
uint32_t status_interval_ms = STATUS_INTERVAL_MS;
uint32_t last_status_update = 0;

6
Makefile
View File

@ -99,11 +99,11 @@ upload-mega2560:
arduino-cli upload -p /dev/ttyACM0 --fqbn arduino:avr:mega
upload-tbeam:
arduino-cli upload -p /dev/ttyUSB1 --fqbn esp32:esp32:t-beam
arduino-cli upload -p /dev/ttyACM0 --fqbn esp32:esp32:t-beam
@sleep 1
rnodeconf /dev/ttyUSB1 --firmware-hash $$(./partition_hashes ./build/esp32.esp32.t-beam/RNode_Firmware.ino.bin)
rnodeconf /dev/ttyACM0 --firmware-hash $$(./partition_hashes ./build/esp32.esp32.t-beam/RNode_Firmware.ino.bin)
@sleep 3
python ./Release/esptool/esptool.py --chip esp32 --port /dev/ttyUSB1 --baud 921600 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 80m --flash_size 4MB 0x210000 ./Release/console_image.bin
python ./Release/esptool/esptool.py --chip esp32 --port /dev/ttyACM0 --baud 921600 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 80m --flash_size 4MB 0x210000 ./Release/console_image.bin
upload-lora32_v10:
arduino-cli upload -p /dev/ttyUSB0 --fqbn esp32:esp32:ttgo-lora32

63
RNode_Firmware.ino
View File

@ -373,6 +373,7 @@ void flushQueue(void) {
if (!queue_flushing) {
queue_flushing = true;
led_tx_on();
uint16_t processed = 0;
#if MCU_VARIANT == MCU_ESP32
@ -394,6 +395,9 @@ void flushQueue(void) {
processed++;
}
}
lora_receive();
led_tx_off();
}
queue_height = 0;
@ -439,6 +443,7 @@ void update_airtime() {
}
longterm_channel_util = (float)longterm_channel_util_sum/(float)AIRTIME_BINS;
update_csma_p();
kiss_indicate_channel_stats();
#endif
}
@ -446,7 +451,6 @@ void update_airtime() {
void transmit(uint16_t size) {
if (radio_online) {
if (!promisc) {
led_tx_on();
uint16_t written = 0;
uint8_t header = random(256) & 0xF0;
@ -471,9 +475,6 @@ void transmit(uint16_t size) {
}
LoRa.endPacket(); add_airtime(written);
led_tx_off();
lora_receive();
} else {
// In promiscuous mode, we only send out
// plain raw LoRa packets with a maximum
@ -500,9 +501,6 @@ void transmit(uint16_t size) {
written++;
}
LoRa.endPacket(); add_airtime(written);
led_tx_off();
lora_receive();
}
} else {
kiss_indicate_error(ERROR_TXFAILED);
@ -934,7 +932,7 @@ void updateModemStatus() {
}
} else {
if (dcd_count > 0) {
dcd_count--;
dcd_count = 0;
} else {
dcd_led = false;
}
@ -1099,6 +1097,13 @@ void validate_status() {
}
}
#define _e 2.71828183
#define _S 10.0
float csma_slope(float u) { return (pow(_e,_S*u-_S/2.0))/(pow(_e,_S*u-_S/2.0)+1.0); }
void update_csma_p() {
csma_p = (uint8_t)((1.0-(csma_p_min+(csma_p_max-csma_p_min)*csma_slope(airtime)))*255.0);
}
void loop() {
if (radio_online) {
checkModemStatus();
@ -1121,21 +1126,41 @@ void loop() {
if (!airtime_lock) {
if (queue_height > 0) {
if (!dcd_waiting) updateModemStatus();
#if MCU_VARIANT == MCU_ESP32
if (!dcd && !dcd_led) {
if (dcd_waiting) delay(lora_rx_turnaround_ms);
if (dcd_waiting && (millis() >= dcd_wait_until)) { dcd_waiting = false; }
if (!dcd_waiting) {
updateModemStatus();
long check_time = millis();
updateModemStatus();
if (!dcd) {
dcd_waiting = false;
flushQueue();
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;
}
}
}
} else {
dcd_waiting = true;
}
#else
if (!dcd_waiting) updateModemStatus();
if (!dcd && !dcd_led) {
if (dcd_waiting) delay(lora_rx_turnaround_ms);
updateModemStatus();
if (!dcd) {
dcd_waiting = false;
flushQueue();
}
} else {
dcd_waiting = true;
}
#endif
}
}

1
Utilities.h
View File

@ -912,6 +912,7 @@ 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;
} else {
lora_bitrate = 0;
}