Decoding APRS frames finished, started with transmitting frames.
Committer: marcel <marcel@hampi.pe1rxf>
This commit is contained in:
marcel
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42186
build/src/main.dis
42186
build/src/main.dis
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6781
build/src/main.hex
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12
src/Config.h
12
src/Config.h
@@ -28,7 +28,7 @@
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int loraPreamble = 8;
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int loraCodingRate = 5;
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int loraTxPower = 17;
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int LoRaPaSelect = 1;
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int LoRaPaSelect = 0;
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uint32_t loraBandwidth = 125E3;
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uint32_t loraFrequency = 433775000;
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@@ -56,5 +56,15 @@
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const uint8_t SIG_DETECT = 0x01;
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const uint8_t SIG_SYNCED = 0x02;
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const uint8_t RX_ONGOING = 0x04;
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struct aprssettings {
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uint8_t MyCall[10] = { 'P','E','1','R','X','F','-','5', 0} ;
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uint8_t ServerCall[10] = { 'P','E','1','R','X','F','-','3', 0} ;
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uint8_t Destination[10] = { 'A','P','Z','M','D','M', 0} ;
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uint8_t Path1[10] = { 0,'I','D','E','1','-', '1', 0} ;
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uint8_t Path2[10] = { 0,'I','D','E','2','-', '2', 0} ;
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uint8_t FirmwareVersion[20] = { 'V','1',',','C','o','n','t','r', 'o','l','l','e','r',' ','0','1', 0} ;
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} AprsSettings;
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#endif
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248
src/main.cpp
248
src/main.cpp
@@ -7,11 +7,19 @@
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#include "KISS.h"
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bool startRadio();
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bool LoadSettings();
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void getPacketData(int packetLength);
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int compare_strings(uint8_t a[], uint8_t b[]);
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bool is_message_for_me (uint8_t data[], uint8_t mycall[]);
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void encode_kiss ();
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uint16_t decode_packet ();
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void ComposeAprsFrame(uint8_t payload[]);
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void transmit();
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int main() {
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uint16_t ServerCommand = 0;
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/* Among others, this initializes the USB-serial port at 115200bps 8N1 */
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stdio_init_all();
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@@ -21,6 +29,8 @@ int main() {
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memset(txBuffer, 0, sizeof(txBuffer));
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sleep_ms(5000);
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LoadSettings();
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startRadio();
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@@ -40,16 +50,43 @@ int main() {
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}
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rxBuffer[packetSize-3] = 0;
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printf("%s\n", rxBuffer);
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encode_kiss();
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ServerCommand = decode_packet();
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} else {
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printf("ERROR: No or corrupted APRS frame.\n");
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}
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}
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if (ServerCommand) {
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if (ServerCommand == 1) {
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ComposeAprsFrame(AprsSettings.FirmwareVersion);
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// Wait for 100ms before responding
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sleep_ms(5000);
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transmit();
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sleep_ms(5000);
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transmit();
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sleep_ms(5000);
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transmit();
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sleep_ms(5000);
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transmit();
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}
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ServerCommand = 0;
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}
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}
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return 0;
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}
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/*
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* Load settings from EEPROM
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*/
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bool LoadSettings()
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{
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printf("APRS settings:\n");
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printf("My call: %s\n", AprsSettings.MyCall);
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printf("Server call: %s\n", AprsSettings.ServerCall);
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}
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/*
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* Initializes the LoRa module with the parameters set in config.h
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*/
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@@ -95,8 +132,9 @@ void getPacketData(int packetLength)
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/* Encode LoRa APRS frame: extract source call, digipeater path and data field. At the same time, check for data corruption
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*
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* If frame is a message from the server it returns the command from this server
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*/
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void encode_kiss ()
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uint16_t decode_packet ()
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{
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int position = 0;
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int cnt = 0;
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@@ -105,13 +143,19 @@ void encode_kiss ()
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uint8_t aprs_source_address[10];
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uint8_t aprs_digi_path[255];
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uint8_t aprs_data_field[255];
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uint8_t aprs_data_field[255];
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uint8_t aprs_message[255];
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uint8_t aprs_digis[10][10];
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uint8_t aprs_acknowledge_number[255];
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bool aprs_acknowledge_request = false;
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uint16_t aprs_server_command = 0;
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memset(aprs_source_address, 0, sizeof(aprs_source_address));
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memset(aprs_digi_path, 0, sizeof(aprs_digi_path));
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memset(aprs_data_field, 0, sizeof(aprs_data_field));
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memset(aprs_message, 0, sizeof(aprs_message));
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memset(aprs_digis, 0, sizeof(aprs_digis));
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memset(aprs_acknowledge_number, 0, sizeof(aprs_acknowledge_number));
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// Extract from address
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cnt = 0;
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@@ -184,8 +228,202 @@ void encode_kiss ()
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aprs_digis[number_of_digipeaters][cnt] = 0;
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}
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if (valid_apsr_data)
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if (valid_apsr_data) {
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// Check if packet comes from our server and if so, check if it is a message for us.
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if ( !compare_strings(aprs_source_address, AprsSettings.ServerCall) ) {
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if ( is_message_for_me(aprs_data_field, AprsSettings.MyCall) )
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{
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// Extract aprs message from data field
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position=11;
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while( aprs_data_field[position] != 0 )
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{
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aprs_message[position-11] = aprs_data_field[position];
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position++;
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}
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// Extract command and acknowledge number (if present)
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cnt = 0;
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position = 0;
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while( aprs_message[position] != 0 )
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{
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if ( aprs_message[position] == '{' ) {
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aprs_acknowledge_number[cnt++] = ':';
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while ( AprsSettings.ServerCall[cnt-1] != 0 )
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{
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aprs_acknowledge_number[cnt] = AprsSettings.ServerCall[cnt-1];
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cnt++;
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}
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//Fill with spaces
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while ( cnt<10 )
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{
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aprs_acknowledge_number[cnt++] = ' ';
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}
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aprs_acknowledge_number[cnt++] = ':';
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aprs_acknowledge_number[cnt++] = 'a';
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aprs_acknowledge_number[cnt++] = 'c';
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aprs_acknowledge_number[cnt++] = 'k';
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aprs_acknowledge_request = true;
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}
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// Calculate server command
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if (!aprs_acknowledge_request) {
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aprs_server_command = 10*aprs_server_command + aprs_message[position]-48;
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}
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position++;
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if (aprs_acknowledge_request) {
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aprs_acknowledge_number[cnt++] = aprs_message[position];
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}
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}
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aprs_acknowledge_number[cnt] = 0;
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}
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}
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printf("Source address: %s\nDigipeaters (%u): %s %s %s %s\nData: %s\n", aprs_source_address, number_of_digipeaters+1, aprs_digis[0], aprs_digis[1], aprs_digis[2], aprs_digis[3], aprs_data_field);
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if (aprs_message[0])
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{
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printf("Message from server: %s (command %u)\n", aprs_message, aprs_server_command);
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if (aprs_acknowledge_request) {
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ComposeAprsFrame(aprs_acknowledge_number);
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// Wait for 100ms before responding with acknowledge
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sleep_ms(100);
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transmit();
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printf("Acknowledge request: %s\n", aprs_acknowledge_number);
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}
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}
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}
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else
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printf("Error decoding APRS frame.");
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return (aprs_server_command);
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}
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/*
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* Checks if aprs datafield contains message and if message is for us
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*
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* Returns: 0 if datafield contains no message for us
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* 1 if datafield contains a message for us
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*/
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bool is_message_for_me (uint8_t data[], uint8_t mycall[])
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{
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// A variable to iterate through the strings
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int i=0;
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if (data[0] == ':' && data[10] == ':')
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{
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while( i<9 && mycall[i] != 0 ) {
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if (data[i+1] != mycall[i]) {
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return (0);
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}
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i++;
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}
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return (1);
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}
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return (0);
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}
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int compare_strings(uint8_t a[], uint8_t b[])
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{
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// A variable to iterate through the strings
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int i = 0;
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while (a[i] == b[i])
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{
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// If either of the strings reaches the end
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// we stop the loop
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if (a[i] == '\0' || b[i] == '\0')
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break;
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i++;
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}
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// We check if both the strings have been compared
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// till the end or not
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// If the strings are compared till the end they are equal
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if (a[i] == '\0' && b[i] == '\0')
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return 0;
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else
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{
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if(a[i] == '\0')
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return -1*(b[i]);
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else if(b[i] == '\0')
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return a[i];
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else
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return (a[i]-b[i]);
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}
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}
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void ComposeAprsFrame(uint8_t payload[])
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{
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uint16_t BufferPosition = 0;
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uint16_t cnt = 0;
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// APRS header
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txBuffer[BufferPosition++] = '<';
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txBuffer[BufferPosition++] = 0xff;
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txBuffer[BufferPosition++] = 0x01;
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while ( AprsSettings.MyCall[cnt] != 0 && BufferPosition<MTU )
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{
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txBuffer[BufferPosition++] = AprsSettings.MyCall[cnt];
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cnt++;
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}
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txBuffer[BufferPosition++] = '>';
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cnt=0;
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while ( AprsSettings.Destination[cnt] != 0 && BufferPosition<MTU )
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{
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txBuffer[BufferPosition++] = AprsSettings.Destination[cnt];
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cnt++;
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}
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if ( AprsSettings.Path1[0] != 0)
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txBuffer[BufferPosition++] = ',';
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cnt=0;
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while ( AprsSettings.Path1[cnt] != 0 && BufferPosition<MTU )
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{
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txBuffer[BufferPosition++] = AprsSettings.Path1[cnt];
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cnt++;
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}
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if ( AprsSettings.Path2[0] != 0)
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txBuffer[BufferPosition++] = ',';
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cnt=0;
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while ( AprsSettings.Path2[cnt] != 0 && BufferPosition<MTU )
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{
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txBuffer[BufferPosition++] = AprsSettings.Path2[cnt];
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cnt++;
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}
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txBuffer[BufferPosition++] = ':';
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cnt=0;
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while ( payload[cnt] != 0 && BufferPosition<MTU )
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{
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txBuffer[BufferPosition++] = payload[cnt];
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cnt++;
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}
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printf("%s\n", txBuffer);
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}
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void transmit() {
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uint16_t position = 0;
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LoRa.beginPacket();
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while( txBuffer[position] != 0 )
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{
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LoRa.write(txBuffer[position]);
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position++;
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}
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LoRa.endPacket();
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LoRa.receive();
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}
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