Adding optional CAN enable Pin config

Author: jamiejones85

data/settings.html

@@ -23,7 +23,10 @@ <h2>Settings</h2>
 
         <p><label for="canTXPin">CAN TX Pin: </label><input id="canTXPin" name="canTXPin" type="text" value="%canTXPin%"/></p>
         <p><label for="canRXPin">CAN RX Pin: </label><input id="canRXPin" name="canRXPin" type="text" value="%canRXPin%"/></p>
+        <p><label for="canEnablePin">CAN Enable Pin: </label><input id="canEnablePin" name="canEnablePin" type="text" value="%canEnablePin%"/> Set to 0 if not required</p>
 
+        <p><strong>Open Inverter Can board:- TX Pin: 25 RX Pin: 26</strong></p>
+        <p><strong>Lilygo T-Can board:- TX Pin: 27 RX Pin: 26 Can Enable Pin: 23</strong></p>
         <a href="#" onclick="ui.settingsForm('settingsForm');"><button>
             <img class="buttonimg" src="/icon-check-circle.png">Modify</button></a>
     </form>

esp32-web-interface.ino

@@ -587,13 +587,20 @@ static void handleNodeId()
 static void handleSettings()
 {
   bool updated = true;
-  if(server.hasArg("canRXPin") && server.hasArg("canRXPin"))
+  if(server.hasArg("canRXPin") && server.hasArg("canRXPin")  && server.hasArg("canEnablePin"))
   {
     config.setCanRXPin(atoi(server.arg("canRXPin").c_str()));
     config.setCanTXPin(atoi(server.arg("canTXPin").c_str()));
+    config.setCanEnablePin(atoi(server.arg("canEnablePin").c_str()));
+
     config.saveSettings();
     OICan::Init(OICan::GetNodeId(), OICan::GetBaudRate(), config.getCanTXPin(), config.getCanRXPin());
 
+
+    if (config.getCanEnablePin() > 0) {
+      pinMode(config.getCanEnablePin(), OUTPUT);
+      digitalWrite(config.getCanEnablePin(), LOW);
+    }
   }
   else
   {
@@ -602,6 +609,8 @@ static void handleSettings()
     file.close();
     html.replace("%canRXPin%", String(config.getCanRXPin()).c_str());
     html.replace("%canTXPin%", String(config.getCanTXPin()).c_str());
+    html.replace("%canEnablePin%", String(config.getCanEnablePin()).c_str());
+
     server.send(200, "text/html", html);
     updated = false;
   }
@@ -727,6 +736,11 @@ void setup(void){
 
   config.load();
 
+  if (config.getCanEnablePin() > 0) {
+    pinMode(config.getCanEnablePin(), OUTPUT);
+    digitalWrite(config.getCanEnablePin(), LOW);
+  }
+
   OICan::Init(1, OICan::Baud500k, config.getCanTXPin(), config.getCanRXPin());
 
   updater.setup(&server);

src/config.cpp

@@ -12,6 +12,7 @@ void Config::load() {
         settings.version = EEPROM_VERSION;
         settings.canRXPin = GPIO_NUM_26;
         settings.canTXPin = GPIO_NUM_25;
+        settings.canEnablePin = 0;
     }
 }
 int Config::getCanRXPin() {
@@ -22,14 +23,23 @@ int Config::getCanTXPin() {
     return settings.canTXPin;
 }
 
-void Config::setCanRXPin(int pin) {
-    settings.canRXPin = pin;
+int Config::getCanEnablePin() {
+    return settings.canEnablePin;
+}
+
+
+void Config::setCanEnablePin(int pin) {
+    settings.canEnablePin = pin;
 }
 
 void Config::setCanTXPin(int pin) {
     settings.canTXPin = pin;
 }
 
+void Config::setCanRXPin(int pin) {
+    settings.canRXPin = pin;
+}
+
 void Config::saveSettings() {
     EEPROM.put(0, settings); //save all change to eeprom
     EEPROM.commit();

src/config.h

@@ -1,11 +1,12 @@
 #ifndef CONFIG_H
 #define CONFIG_H
 
-#define EEPROM_VERSION 1
+#define EEPROM_VERSION 2
 typedef struct {
     int version;
     int canRXPin;
     int canTXPin;
+    int canEnablePin;
 } EEPROMSettings;
 
 
@@ -20,6 +21,10 @@ class Config
     int getCanTXPin();
     void setCanTXPin(int pin);
 
+
+    int getCanEnablePin();
+    void setCanEnablePin(int pin);
+
     void saveSettings();
   private:
     EEPROMSettings settings;