Added support for I2S for Inkplate6.

Author: BornaBiro

src/Inkplate.cpp

@@ -121,7 +121,9 @@ int Inkplate::einkOn()
     pinsAsOutputs();
     LE_CLEAR;
     OE_CLEAR;
+#if !defined(ARDUINO_ESP32_DEV) && !defined(ARDUINO_INKPLATE6V2) // Not used on Inkplate6 anymore.
     CL_CLEAR;
+#endif
     SPH_SET;
     GMOD_SET;
     SPV_SET;
@@ -157,7 +159,11 @@ void Inkplate::einkOff()
         return;
     OE_CLEAR;
     GMOD_CLEAR;
+#if !defined(ARDUINO_ESP32_DEV) && !defined(ARDUINO_INKPLATE6V2) // Not used on Inkplate6 anymore.
     GPIO.out &= ~(DATA | LE | CL);
+#else
+    LE_CLEAR;
+#endif
     CKV_CLEAR;
     SPH_CLEAR;
     SPV_CLEAR;
@@ -176,6 +182,8 @@ void Inkplate::einkOff()
     WAKEUP_CLEAR;
 #endif
 
+    pinsZstate();
+
     setPanelState(0);
 }
 
@@ -233,11 +241,13 @@ void Inkplate::vscan_start()
  */
 void Inkplate::hscan_start(uint32_t _d)
 {
+#if !defined(ARDUINO_ESP32_DEV) && !defined(ARDUINO_INKPLATE6V2)
     SPH_CLEAR;
     GPIO.out_w1ts = (_d) | CL;
     GPIO.out_w1tc = DATA | CL;
     SPH_SET;
     CKV_SET;
+#endif
 }
 
 /**
@@ -258,14 +268,15 @@ void Inkplate::vscan_end()
  */
 void Inkplate::pinsZstate()
 {
-    pinMode(0, INPUT);
     pinMode(2, INPUT);
     pinMode(32, INPUT);
     pinMode(33, INPUT);
     pinModeInternal(IO_INT_ADDR, ioRegsInt, OE, INPUT);
     pinModeInternal(IO_INT_ADDR, ioRegsInt, GMOD, INPUT);
     pinModeInternal(IO_INT_ADDR, ioRegsInt, SPV, INPUT);
 
+    // Set up the EPD Data and CL pins for I2S (only on Inkplate6).
+    pinMode(0, INPUT);
     pinMode(4, INPUT);
     pinMode(5, INPUT);
     pinMode(18, INPUT);
@@ -274,21 +285,41 @@ void Inkplate::pinsZstate()
     pinMode(25, INPUT);
     pinMode(26, INPUT);
     pinMode(27, INPUT);
+
+#if defined(ARDUINO_ESP32_DEV) || defined(ARDUINO_INKPLATE6V2)
+    // Disable clock for the EPD.
+    myI2S->conf1.tx_stop_en = 0;
+#endif
 }
 
 /**
  * @brief       pinsAsOutputs sets all tps pins as outputs
  */
 void Inkplate::pinsAsOutputs()
 {
-    pinMode(0, OUTPUT);
     pinMode(2, OUTPUT);
     pinMode(32, OUTPUT);
     pinMode(33, OUTPUT);
     pinModeInternal(IO_INT_ADDR, ioRegsInt, OE, OUTPUT);
     pinModeInternal(IO_INT_ADDR, ioRegsInt, GMOD, OUTPUT);
     pinModeInternal(IO_INT_ADDR, ioRegsInt, SPV, OUTPUT);
 
+#if defined(ARDUINO_ESP32_DEV) || defined(ARDUINO_INKPLATE6V2)
+    // Set up the EPD Data and CL pins for I2S.
+    setI2S1pin(0, I2S1O_BCK_OUT_IDX, 0);
+    setI2S1pin(4, I2S1O_DATA_OUT0_IDX, 0);
+    setI2S1pin(5, I2S1O_DATA_OUT1_IDX, 0);
+    setI2S1pin(18, I2S1O_DATA_OUT2_IDX, 0);
+    setI2S1pin(19, I2S1O_DATA_OUT3_IDX, 0);
+    setI2S1pin(23, I2S1O_DATA_OUT4_IDX, 0);
+    setI2S1pin(25, I2S1O_DATA_OUT5_IDX, 0);
+    setI2S1pin(26, I2S1O_DATA_OUT6_IDX, 0);
+    setI2S1pin(27, I2S1O_DATA_OUT7_IDX, 0);
+
+    // Start sending clock to the EPD.
+    myI2S->conf1.tx_stop_en = 0;
+#else
+    pinMode(0, OUTPUT);
     pinMode(4, OUTPUT);
     pinMode(5, OUTPUT);
     pinMode(18, OUTPUT);
@@ -297,6 +328,7 @@ void Inkplate::pinsAsOutputs()
     pinMode(25, OUTPUT);
     pinMode(26, OUTPUT);
     pinMode(27, OUTPUT);
+#endif
 }
 
 #endif