672 lines
22 KiB
C++
672 lines
22 KiB
C++
/****************************************************************************************************************************
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Remote PA Monitor - solution to remotely monitor RF power, VSWR and more of QO-100 power amplifiers
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For Ethernet shields using WT32_ETH01 (ESP32 + LAN8720)
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Uses WebServer_WT32_ETH01, a library for the Ethernet LAN8720 in WT32_ETH01 to run WebServer
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Author: Michael Clemens, DK1MI
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Licensed under GPLv3 license (see LICENSE.md)
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VU meter code was taken from https://github.com/tomnomnom/vumeter, credits go to Tom Hudson (https://github.com/tomnomnom)
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*****************************************************************************************************************************/
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#define DEBUG_ETHERNET_WEBSERVER_PORT Serial
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// Debug Level from 0 to 4
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#define _ETHERNET_WEBSERVER_LOGLEVEL_ 3
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#define FORMAT_SPIFFS_IF_FAILED true
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#include <WebServer_WT32_ETH01.h>
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#include "javascript.h"
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#include "dashboard_css.h"
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#include "config_css.h"
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#include "index.h" // Main Web page header file
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#include <Preferences.h>
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#include "FS.h"
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#include "SPIFFS.h"
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String version = "0.9.2";
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Preferences config;
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Preferences global_config;
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String band_config_items[] = { "b_show_mV", "b_show_dBm", "b_show_watt", "s_vswr_thresh", "b_vswr_beep", "s_ant_name", "s_max_led_pwr_f", "s_max_led_pwr_r", "s_max_led_vswr", "b_show_led_fwd", "b_show_led_ref", "b_show_led_vswr" };
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String band_config_defaults[] = { "true", "true", "true", "2", "true", " ", "100", "100", "3", "true", "true", "true" };
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String band_config_nice_names[] = {"Show voltage in mV (yes/no)", "Show power level in dBm (yes/no)", "Show Power in Watt (yes/no)", "VSWR Threshold that triggers a warning (e.g. 3)", "Beep if VSWR threshold is exceeded (yes/no)", "Name of the antenna", "Max. FWD Power displayed by LED bar graph in W (e.g. 100)", "Max. REF Power displayed by LED bar graph in W (e.g. 100)", "Max. VSWR displayed by LED bar graph (e.g. 3)", "Show LED graph for FWD power (yes/no)", "Show LED graph for REF power (yes/no)", "Show LED graph for VSWR (yes/no)" };
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double fwd_array[3300] = {};
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double ref_array[3300] = {};
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int voltage_fwd, voltage_ref;
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double fwd_dbm = 0, ref_dbm = 0;
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double fwd_watt = 0, ref_watt = 0;
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byte iii = 0;
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String conf_content;
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String conf_textareas = "";
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String conf_config_table = "";
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String band = "";
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String default_band = "70cm";
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String band_fwd = band + "_fwd";
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String band_ref = band + "_ref";
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String band_list[] = { "1.25cm", "3cm", "6cm", "9cm", "13cm", "23cm", "70cm", "2m", "HF" };
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int IO2_FWD = 2;
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int IO4_REF = 4;
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WebServer server(80);
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// Select the IP address according to your local network
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IPAddress myIP(192, 168, 1, 100);
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IPAddress myGW(192, 168, 1, 1);
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IPAddress mySN(255, 255, 255, 0);
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IPAddress myDNS(192, 168, 1, 1);
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// Reads a file from SPIFF and returns its content as a string
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String readFile(fs::FS &fs, const char *path) {
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Serial.printf("Reading file: %s\r\n", path);
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File file = fs.open(path);
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if (!file || file.isDirectory()) {
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Serial.println("failed to open file for reading");
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return "";
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}
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String ret = "";
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Serial.println("read from file:");
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while (file.available()) {
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ret += char(file.read());
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}
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file.close();
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return ret;
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}
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// Takes a string and writes it to a file on SPIFF
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void writeFile(fs::FS &fs, const char *path, const char *message) {
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Serial.printf("Writing file: %s\r\n", path);
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File file = fs.open(path, FILE_WRITE);
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if (!file) {
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Serial.println("failed to open file for writing");
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return;
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}
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if (file.print(message)) {
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Serial.println("file written");
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} else {
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Serial.println("file write failed");
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}
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file.close();
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}
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// converts dBm to Watt
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double dbm_to_watt(double dbm) {
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return pow(10.0, (dbm - 30.0) / 10.0);
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}
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// checks if a given voltage is lower as the smallest value
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// in the table or higher than the biggest value
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bool is_val_out_of_bounds(int mv, bool fwd) {
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double stored_val = 0;
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int key_a = 0;
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int key_b = 0;
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// searches for the first key (voltage) that has a value (dBm)
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for (int i = 0; i < 3300; i++) {
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if (fwd) {
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stored_val = fwd_array[i];
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} else {
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stored_val = ref_array[i];
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}
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if (stored_val != 0) {
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key_a = i;
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break;
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}
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}
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// searches for the last key (voltage) that has a value (dBm)
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for (int i = 3299; i > 0; i--) {
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if (fwd) {
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stored_val = fwd_array[i];
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} else {
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stored_val = ref_array[i];
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}
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if (stored_val != 0) {
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key_b = i;
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break;
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}
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}
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int lowerkey = min(key_a, key_b); // takes both values found above and assigns the lower key
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int higherkey = max(key_a, key_b); // takes both values found above and assigns the higher key
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// returns false if given voltage is between the lowest and highest configured voltages
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// returns true if voltage is out of bounds
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if (lowerkey <= mv and mv <= higherkey)
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return false;
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else {
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return true;
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}
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}
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// takes a voltage value and translates it
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// to dBm based on the corresponding lookup table
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double millivolt_to_dbm(int mv, bool fwd) {
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double lastval = 0;
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double nextval = 0;
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int lastkey = 0;
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int nextkey = 0;
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double stored_val = 0;
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bool ascending = true;
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int lowest_key_in_table = 0;
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int highest_key_in_table = 0;
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// check if table is ascending or descending
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double asc_tmp_val = 0;
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for (int i = 0; i < 3300; i++) {
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if (fwd) {
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stored_val = fwd_array[i];
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} else {
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stored_val = ref_array[i];
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}
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if (stored_val != 0) {
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if (asc_tmp_val == 0) {
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asc_tmp_val = stored_val;
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} else if (stored_val > asc_tmp_val) {
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ascending = true;
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break;
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} else if (stored_val < asc_tmp_val) {
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ascending = false;
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break;
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}
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}
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}
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if (ascending) {
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for (int i = 0; i < 3300; i++) {
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if (fwd) {
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stored_val = fwd_array[i];
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} else {
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stored_val = ref_array[i];
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}
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if (stored_val != 0) {
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if (lowest_key_in_table == 0) {
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lowest_key_in_table = i; //finds the lowest voltage value stored in the table
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}
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highest_key_in_table = i; // we will have the highest voltage value in the table at the end of the loop
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if (i < mv) {
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lastval = stored_val;
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lastkey = i;
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} else {
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nextval = stored_val;
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nextkey = i;
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break;
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}
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}
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}
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} else {
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for (int i = 3300; i > 0; i--) {
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if (fwd) {
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stored_val = fwd_array[i];
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} else {
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stored_val = ref_array[i];
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}
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if (stored_val != 0) {
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if (lowest_key_in_table == 0) {
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lowest_key_in_table = i; //finds the lowest voltage value stored in the table
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}
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highest_key_in_table = i; // we will have the highest voltage value in the table at the end of the loop
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if (i > mv) {
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lastval = stored_val;
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lastkey = i;
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} else {
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nextval = stored_val;
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nextkey = i;
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break;
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}
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}
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}
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}
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double lowerkey = min(lastkey, nextkey);
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double higherkey = max(lastkey, nextkey);
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double lowerval = min(lastval, nextval);
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double higherval = max(lastval, nextval);
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double diffkey = max(lastkey, nextkey) - min(lastkey, nextkey);
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double diffval = max(lastval, nextval) - min(lastval, nextval);
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double result = 0;
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if (ascending) {
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result = lowerval + ((diffval / diffkey) * (mv - lowerkey));
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} else {
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result = higherval - ((diffval / diffkey) * (mv - lowerkey));
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}
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return result;
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}
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// read voltages from both input pins
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// calculates avaerage value of 50 measurements
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void read_directional_couplers() {
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int voltage_sum_fwd = 0;
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int voltage_sum_ref = 0;
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// Takes 50 samples and sums them up
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for (iii = 0; iii < 50; iii++) {
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voltage_sum_fwd += analogReadMilliVolts(IO2_FWD);
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voltage_sum_ref += analogReadMilliVolts(IO4_REF);
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}
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// calculate the average value by deviding the above sum by 50
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voltage_fwd = voltage_sum_fwd / 50;
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voltage_ref = voltage_sum_ref / 50;
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// calculate the dBm value from the voltage based on the calibration table
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fwd_dbm = millivolt_to_dbm(voltage_fwd, true);
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ref_dbm = millivolt_to_dbm(voltage_ref, false);
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// calculate watt from dBm
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fwd_watt = dbm_to_watt(fwd_dbm);
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ref_watt = dbm_to_watt(ref_dbm);
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}
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// delivers the dashboard page in "index.h"
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void handleRoot() {
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String html = MAIN_page;
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String css = DB_STYLESHEET;
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String js = JAVASCRIPT;
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server.send(200, "text/html", css + js + html);
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}
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// delivers a 404 page if a non-existant resouurce is requested
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void handleNotFound() {
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String message = F("File Not Found\n\n");
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message += F("URI: ");
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message += server.uri();
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message += F("\nMethod: ");
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message += (server.method() == HTTP_GET) ? F("GET") : F("POST");
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message += F("\nArguments: ");
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message += server.args();
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message += F("\n");
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for (uint8_t i = 0; i < server.args(); i++) {
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message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
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}
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server.send(404, F("text/plain"), message);
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}
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// executes the function to gather sensor data
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// delivers gathered data to dashboard page
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// invoked periodically by the dashboard page
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void handleDATA() {
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read_directional_couplers();
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double vswr = 0;
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if (fwd_watt > ref_watt) {
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vswr = (1 + sqrt(ref_watt / fwd_watt)) / (1 - sqrt(ref_watt / fwd_watt));
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}
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String vswr_str = "-1";
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String fwd_watt_str = "";
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String ref_watt_str = "";
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if (vswr >= 1) {
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vswr_str = String(vswr);
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}
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double rl = fwd_dbm - ref_dbm;
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// get vswr_threshold from general config
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String vswr_threshold = config.getString(String("s_vswr_thresh").c_str());
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String voltage_fwd_str = "";
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String voltage_ref_str = "";
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if (config.getString(String("b_show_mV").c_str()) != "false") {
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voltage_fwd_str = String(voltage_fwd) + " mV";
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voltage_ref_str = String(voltage_ref) + " mV";
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}
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String fwd_dbm_str = "";
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String ref_dbm_str = "";
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if (config.getString(String("b_show_dBm").c_str()) != "false") {
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fwd_dbm_str = String(fwd_dbm, 2);
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ref_dbm_str = String(ref_dbm, 2);
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}
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if (config.getString(String("b_show_watt").c_str()) != "false") {
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fwd_watt_str = String(fwd_watt, 10);
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}
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if (config.getString(String("b_show_watt").c_str()) != "false") {
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ref_watt_str = String(ref_watt, 10);
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}
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String rl_str = "-- ";
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if (rl > 0) {
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rl_str = (String(rl));
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}
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rl_str.replace("nan", "-- ");
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String antenna_name = config.getString(String("s_ant_name").c_str());
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String vswr_beep = config.getString(String("b_vswr_beep").c_str());
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bool fwd_oob = is_val_out_of_bounds(voltage_fwd, true);
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bool ref_oob = is_val_out_of_bounds(voltage_ref, false);
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// Generate a semicolon seperated string that will be sent to the frontend
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String output = fwd_watt_str + ";"; // data[0]: FWD power in Watt
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output += fwd_dbm_str + ";"; // data[1]: FWD dBm value
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output += voltage_fwd_str + ";"; // data[2]: FWD voltage
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output += ref_watt_str + ";"; // data[3]: REF power in Watt
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output += ref_dbm_str + ";"; // data[4]: REF dBm value
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output += voltage_ref_str + ";"; // data[5]: REF voltage
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output += vswr_str + ";"; // data[6]: VSWR value
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output += rl_str + ";"; // data[7]: RL value
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output += band + ";"; // data[8]: band (e.g. "70cm")
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output += String(vswr_threshold) + ";"; // data[9]: VSWR threshold (e.g. "3")
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output += antenna_name + ";"; // data[10]: Name of antenna (e.g. "X200")
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output += vswr_beep + ";"; // data[11]: should it beep if VSWR is too high? (true/false)
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output += config.getString(String("s_max_led_pwr_f").c_str()) + ";"; // data[12]: highest value in Watt for the FWD LED graph (e.g. "100")
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output += config.getString(String("s_max_led_pwr_r").c_str()) + ";"; // data[13]: highest value in Watt for the REF LED graph (e.g. "1")
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output += config.getString(String("s_max_led_vswr").c_str()) + ";"; // data[14]: highest value in Watt for the VSWR LED graph (e.g. "3")
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output += String(fwd_oob) + ";"; // data[15]: Is the FWD voltage out of bounds? (true/false)
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output += String(ref_oob) + ";"; // data[16]: Is the REF voltage out of bounds? (true/false)
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output += config.getString(String("b_show_led_fwd").c_str()) + ";"; // data[17]: Show the FWD LED bar graph? (true/false)
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output += config.getString(String("b_show_led_ref").c_str()) + ";"; // data[18]: Show the REF LED bar graph? (true/false)
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output += config.getString(String("b_show_led_vswr").c_str()); // data[19]: Show the VSWR LED bar graph? (true/false)
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server.send(200, "text/plane", output);
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}
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// main function for displaying the configuration page
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// invoked by the "configuration" button on the dashboard page
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void handleCONFIG() {
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if (conf_textareas == "") {
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build_textareas();
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}
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if (conf_config_table == "") {
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build_config_table();
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}
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String css = CFG_STYLESHEET;
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conf_content = css;
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conf_content += "<div class='grid-container'>";
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conf_content += "<div id='title_box' class='titlebox maintitlebox'>";
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conf_content += "Configuration</div>";
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conf_content += "<div id='title_box' class='bandbox maintitlebox'>";
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conf_content += "<form method='POST' action='/selectband'>";
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conf_content += "Band: <label for='bands'></label><select class='backend_button' onchange='this.form.submit()'' id='band' name='bands' size='1'>";
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for (int i = 0; i < sizeof band_list / sizeof band_list[0]; i++) {
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String selected = "";
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if (band_list[i] == band) {
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selected = "selected";
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}
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conf_content += "<option value='" + band_list[i] + "' " + selected + " >" + band_list[i] + "</option>";
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}
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conf_content += "</select></form>";
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conf_content += "</div>";
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conf_content += "<div class='subtitle1 subtitlebox'>Translation Detector Voltage /mV to RF-Power level /dBm</div>";
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conf_content += "<div class='translationitems contentbox'>";
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conf_content += conf_textareas;
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conf_content += "</div>";
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conf_content += "<div class='subtitle2 subtitlebox'>General Configuration Items</div>";
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conf_content += "<div class='configitems contentbox'>";
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conf_content += conf_config_table;
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conf_content += "</div>";
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conf_content += "<div class='footerbox'>";
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conf_content += "<form method='POST' action='/'><button class='linkbutton' value='back' name='back' type='submit'>Back to Dashboard</button> - Version: " + version+ " </form>";
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conf_content += "</div>";
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conf_content += "</div>";
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conf_content += "</html>";
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server.send(200, "text/html", conf_content);
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}
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// generates the translation table for either the FWD or
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// REF values
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void build_textareas() {
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String fwd = readFile(SPIFFS, String("/" + band + "fwd.txt").c_str());
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String ref = readFile(SPIFFS, String("/" + band + "ref.txt").c_str());
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clear_fwd_ref_array();
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save_string_to_array(fwd, fwd_array);
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save_string_to_array(ref, ref_array);
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String tbl = "<form action=\"/modtranslation\" method=\"POST\">";
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tbl += "<table class='styled-table'>";
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tbl += "<thead><tr><td>" + band + " FWD (mV:dBm)</td><td>" + band + " REF (mV:dBm)</td></tr></thead>";
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tbl += "<tr><td>";
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tbl += "<textarea id='fwd_textarea' name='fwd_textarea' rows='22'>";
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for (int i = 0; i < sizeof fwd_array / sizeof fwd_array[0]; i++) {
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if (fwd_array[i] != 0) {
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|
tbl += String(i) + ":" + String(fwd_array[i], 5) + "\n";
|
|
}
|
|
}
|
|
tbl += "</textarea>";
|
|
tbl += "</td><td>";
|
|
tbl += "<textarea id='ref_textarea' name='ref_textarea' rows='22'>";
|
|
for (int i = 0; i < sizeof ref_array / sizeof ref_array[0]; i++) {
|
|
if (ref_array[i] != 0) {
|
|
tbl += String(i) + ":" + String(ref_array[i], 5) + "\n";
|
|
}
|
|
}
|
|
tbl += "</textarea>";
|
|
tbl += "</td></tr></table>";
|
|
tbl += "<button class='backend_button' value='save' name='save' type='submit'>Save Calibration Data</button>";
|
|
tbl += "</form>";
|
|
conf_textareas = tbl;
|
|
}
|
|
|
|
|
|
// generates the table with generic configuration items
|
|
void build_config_table() {
|
|
conf_config_table = "<form action=\"/modcfg\" method=\"POST\">";
|
|
conf_config_table += "<table class='styled-table'>";
|
|
//conf_config_table += "<thead><tr><td>Key</td><td>Value</td></td></tr></thead>";
|
|
for (int i = 0; i < sizeof band_config_items / sizeof band_config_items[0]; i++) {
|
|
if (!band_config_items[i].startsWith("x_")) {
|
|
String stored_val = config.getString(band_config_items[i].c_str(), "xxx");
|
|
if (stored_val == "xxx") {
|
|
config.putString(band_config_items[i].c_str(), band_config_defaults[i]);
|
|
stored_val = config.getString(band_config_items[i].c_str(), "");
|
|
}
|
|
conf_config_table += "<tr><td>";
|
|
conf_config_table += band_config_nice_names[i];
|
|
conf_config_table += "</td><td>";
|
|
|
|
if (String(stored_val).equalsIgnoreCase("true")) {
|
|
conf_config_table += "<input type='checkbox' name='" + band_config_items[i] + "' id='" + band_config_items[i] + "' value='true' checked>";
|
|
} else if (String(stored_val).equalsIgnoreCase("false")) {
|
|
conf_config_table += "<input type='checkbox' name='" + band_config_items[i] + "' id='" + band_config_items[i] + "' value='false'>";
|
|
} else {
|
|
conf_config_table += "<input name='" + band_config_items[i] + "' value='" + String(stored_val) + "' valuelength=16>";
|
|
}
|
|
conf_config_table += "</td></tr>";
|
|
}
|
|
}
|
|
//conf_config_table += "<tr><td></td><td><button class='backend_button' type='submit'>Save</button></td></tr>";
|
|
conf_config_table += "</table><button class='backend_button' value='save' name='save' type='submit'>Save Configuration</button></form>";
|
|
handleCONFIG();
|
|
}
|
|
|
|
// Handle request from the config page to change or add values
|
|
// to the XXXX value table for the selected band
|
|
void handleMODTRANS() {
|
|
String fwd = server.arg("fwd_textarea") + "\n";
|
|
String ref = server.arg("ref_textarea") + "\n";
|
|
clear_fwd_ref_array();
|
|
save_string_to_array(fwd, fwd_array);
|
|
save_string_to_array(ref, ref_array);
|
|
|
|
String fwd_of_array = "";
|
|
for (int i = 0; i < sizeof fwd_array / sizeof fwd_array[0]; i++) {
|
|
if (fwd_array[i] != 0) {
|
|
fwd_of_array += String(i) + ":" + String(fwd_array[i], 5) + "\n";
|
|
}
|
|
}
|
|
writeFile(SPIFFS, String("/" + band + "fwd.txt").c_str(), fwd_of_array.c_str());
|
|
|
|
String ref_of_array = "";
|
|
for (int i = 0; i < sizeof ref_array / sizeof ref_array[0]; i++) {
|
|
if (ref_array[i] != 0) {
|
|
ref_of_array += String(i) + ":" + String(ref_array[i], 5) + "\n";
|
|
}
|
|
}
|
|
writeFile(SPIFFS, String("/" + band + "ref.txt").c_str(), ref_of_array.c_str());
|
|
|
|
build_textareas();
|
|
handleCONFIG();
|
|
}
|
|
|
|
// resets all vlaues in the FWD and REF array
|
|
void clear_fwd_ref_array() {
|
|
for (int x = 0; x < sizeof(fwd_array) / sizeof(fwd_array[0]); x++) {
|
|
fwd_array[x] = 0;
|
|
ref_array[x] = 0;
|
|
}
|
|
}
|
|
|
|
// after the user edited the calibration table via the frontend,
|
|
// this function takes the resulting string, detonates it and
|
|
// writes all rows into an array
|
|
void save_string_to_array(String table_data, double arr[]) {
|
|
int r = 0, t = 0;
|
|
for (int i = 0; i < table_data.length(); i++) {
|
|
if (table_data[i] == '\n' || i == table_data.length()) {
|
|
if (i - r > 1) {
|
|
String row = table_data.substring(r, i);
|
|
t++;
|
|
int r2 = 0, t2 = 0;
|
|
for (int j = 0; j < row.length(); j++) {
|
|
if (row[j] == ':' || row[j] == '\n') {
|
|
if (j - r2 > 1) {
|
|
int key = row.substring(r2, j).toInt();
|
|
double val = row.substring(j + 1).toDouble();
|
|
arr[key] = val;
|
|
t2++;
|
|
}
|
|
r2 = (j + 1);
|
|
}
|
|
}
|
|
}
|
|
r = (i + 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Handle request from the config page to change or add values
|
|
// to the general config value table for the selected band
|
|
void handleMODCFG() {
|
|
for (int i = 0; i < sizeof band_config_items / sizeof band_config_items[0]; i++) {
|
|
if (!server.hasArg(band_config_items[i]) and band_config_items[i].startsWith("b_")){
|
|
config.putString(band_config_items[i].c_str(), "false");
|
|
} else if (server.hasArg(band_config_items[i]) and band_config_items[i].startsWith("b_")){
|
|
config.putString(band_config_items[i].c_str(), "true");
|
|
} else {
|
|
config.putString(band_config_items[i].c_str(), server.arg(band_config_items[i]));
|
|
}
|
|
}
|
|
conf_config_table = "";
|
|
build_config_table();
|
|
}
|
|
|
|
// changes the band according to the user's selection
|
|
// regenerates the translation tables and fills them
|
|
// with the values assigned to the respective band
|
|
// invoked by selecting a band from the select box of the config page
|
|
void handleBAND() {
|
|
band = server.arg("bands");
|
|
band_fwd = band + "_fwd";
|
|
band_ref = band + "_ref";
|
|
global_config.putString(String("x_selected_band").c_str(), band);
|
|
config.end();
|
|
String bnd_cnf = "config_" + band;
|
|
config.begin(bnd_cnf.c_str(), false);
|
|
conf_textareas = "";
|
|
conf_config_table = "";
|
|
//build_config_table();
|
|
//build_textareas();
|
|
handleCONFIG();
|
|
}
|
|
|
|
// initialization routine
|
|
void setup() {
|
|
|
|
|
|
Serial.begin(115200);
|
|
|
|
while (!Serial)
|
|
;
|
|
|
|
// Using this if Serial debugging is not necessary or not using Serial port
|
|
//while (!Serial && (millis() < 3000));
|
|
|
|
Serial.print("\nStarting AdvancedWebServer on " + String(ARDUINO_BOARD));
|
|
Serial.println(" with " + String(SHIELD_TYPE));
|
|
Serial.println(WEBSERVER_WT32_ETH01_VERSION);
|
|
|
|
// To be called before ETH.begin()
|
|
WT32_ETH01_onEvent();
|
|
|
|
ETH.begin(ETH_PHY_ADDR, ETH_PHY_POWER);
|
|
|
|
// Static IP, leave without this line to get IP via DHCP
|
|
//ETH.config(myIP, myGW, mySN, myDNS);
|
|
|
|
WT32_ETH01_waitForConnect();
|
|
|
|
// activates single web server endpoints
|
|
server.on(F("/"), handleRoot);
|
|
server.on("/readDATA", handleDATA);
|
|
server.on("/config", handleCONFIG);
|
|
server.on("/modcfg", handleMODCFG);
|
|
server.on("/selectband", handleBAND);
|
|
server.on("/modtranslation", handleMODTRANS);
|
|
|
|
|
|
if (!SPIFFS.begin(FORMAT_SPIFFS_IF_FAILED)) {
|
|
Serial.println("SPIFFS Mount Failed");
|
|
return;
|
|
}
|
|
|
|
server.onNotFound(handleNotFound);
|
|
server.begin();
|
|
|
|
Serial.print(F("HTTP EthernetWebServer is @ IP : "));
|
|
Serial.println(ETH.localIP());
|
|
|
|
analogReadResolution(12);
|
|
|
|
global_config.begin("config", false);
|
|
band = global_config.getString(String("x_selected_band").c_str());
|
|
if (band == "") {
|
|
global_config.putString(String("x_selected_band").c_str(), default_band);
|
|
band = default_band;
|
|
}
|
|
String bnd_cnf = "config_" + band;
|
|
config.begin(bnd_cnf.c_str(), false);
|
|
|
|
build_textareas();
|
|
}
|
|
|
|
void loop() {
|
|
server.handleClient();
|
|
} |