R4A

Template Project/lib/ESPMegaPRO/ESPMegaPRO.cpp

@@ -5,6 +5,7 @@ uint8_t inputBufferB;
 
 PCF8574 inputBankA(INPUT_BANK_A_ADDRESS);
 PCF8574 inputBankB(INPUT_BANK_B_ADDRESS);
+PCF8574 utilBank(UTIL_BANK_ADDRESS);
 Adafruit_PWMServoDriver pwmBank = Adafruit_PWMServoDriver(PWM_BANK_ADDRESS);
 FRAM ESPMega_FRAM;
 
@@ -22,6 +23,7 @@ void ESPMega_begin()
     Wire.begin(14, 33);
     inputBankA.begin();
     inputBankB.begin();
+    utilBank.begin();
     pwmBank.begin();
     ESPMega_FRAM.begin(FRAM_ADDRESS);
     // ESPMegaPRO v3 use the PWMBank to drive Half Bridge
@@ -168,11 +170,50 @@ bool ESPMega_updateTimeFromNTP()
         {
             ESPMega_setTime(timeinfo.tm_hour, timeinfo.tm_min, timeinfo.tm_sec,
                             timeinfo.tm_mday, timeinfo.tm_mon + 1, timeinfo.tm_year + 1900);
-            
         }
         return true;
     }
     return false;
 }
 
-#endif
+#endif
+
+void ESPMega_mapIO(int pin, int channel)
+{
+    if (channel < 4 && channel >= 0)
+    {
+        if (pin == 4 || pin == 32)
+        {
+            utilBank.write(5, (channel - channel % 2) / 2);
+            utilBank.write(4, channel % 2);
+        }
+        if (pin == 12 || pin == 17)
+        {
+            utilBank.write(7, (channel - channel % 2) / 2);
+            utilBank.write(6, channel % 2);
+        }
+    }
+}
+
+void ESPMega_RS485_begin()
+{
+    Serial1.begin(115200);
+    ESPMega_RS485_recieveEnable();
+}
+
+void ESPMega_RS485_transmitEnable()
+{
+    utilBank.write(0, 1);
+    utilBank.write(1, 0);
+}
+
+void ESPMega_RS485_recieveEnable()
+{
+    utilBank.write(0, 0);
+    utilBank.write(1, 1);
+}
+
+void ESPMega_RS485_disable() {
+    utilBank.write(0, 0);
+    utilBank.write(1, 0);
+}

Template Project/lib/ESPMegaPRO/ESPMegaPRO.h

@@ -16,6 +16,7 @@
 
 #define INPUT_BANK_A_ADDRESS 0x21
 #define INPUT_BANK_B_ADDRESS 0x22
+#define UTIL_BANK_ADDRESS 0x24
 #define PWM_BANK_ADDRESS 0x5F
 #define RTC_ADDRESS 0x68
 #define ANALOG_INPUT_BANK_A_ADDRESS 0x48
@@ -127,4 +128,17 @@ int16_t ESPMega_analogRead(int id);
 void ESPMega_dacWrite(int id, int value);
 #endif
 
-#endif
+#endif
+
+/**
+ * Map a pair of GPIO pin to a Multiplexer Channel
+ * through the ESPMega's Muxer
+ * @param pin The number of a multiplexing-capable pin in a pair to map [12,17], [4,32]
+ * @param channel Muxer channel to map to (0-3)
+*/
+void ESPMega_mapIO(int pin, int channel);
+
+void ESPMega_RS485_begin();
+void ESPMega_RS485_transmitEnable();
+void ESPMega_RS485_recieveEnable();
+void ESPMega_RS485_disable();