Fixed the basic deep sleep sketch, testing this branch

examples/Inkplate6COLOR/Advanced/DeepSleep/Inkplate6COLOR_Simple_Deep_Sleep/Inkplate6COLOR_Simple_Deep_Sleep.ino

@@ -39,33 +39,26 @@ Inkplate display; // Create an object on Inkplate library and also set library i
 
 void setup()
 {
-    pinMode(25, OUTPUT);
-
-    Serial.begin(115200);
-    Serial.println("about to enter begin...");
-
-
-    delay(1000);
-
     display.begin();        // Init Inkplate library (you should call this function ONLY ONCE)
-
-    delay(1000);
-
+    display.clearDisplay(); // Clear frame buffer of display
+    display.drawImage(
+        pictures[slide], 0, 0, 600,
+        448); // Display selected picture at location X=0, Y=0. All three pictures have resolution of 600x448 pixels
+    display.display(); // Refresh the screen with new picture
+    slide++; // Update counter for pictures. With this variable, we choose what picture is going to be displayed on
+             // screen
+    if (slide > 2)
+        slide = 0; // We do not have more than 3 images, so roll back to zero
 
     // Uncomment this line if your Inkplate is older than Aug 2021 as older Inkplates have ESP32 wrover-e chips
     // rtc_gpio_isolate(GPIO_NUM_12); // Isolate/disable GPIO12 on ESP32 (only to reduce power consumption in sleep)
 
     // Activate wake-up timer -- wake up after 20s here
     esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
 
-    blinkLED();
-    blinkLED();
+    // This function must additionaly be called on Inkplate 6COLOR to initiate sleep
     display.sleepColorPanel();
-    delay(1000);
 
-    blinkLED();
-    blinkLED();
-    blinkLED();
     // Put ESP32 into deep sleep. Program stops here.
     esp_deep_sleep_start();
 }
@@ -74,16 +67,4 @@ void loop()
 {
     // Nothing! If you use deep sleep, whole program should be in setup() because each time the board restarts, not in a
     // loop()! loop() must be empty!
-}
-
-void blinkLED()
-{
-    digitalWrite(25,HIGH);
-    delay(100);
-    digitalWrite(25,LOW);
-    delay(100);
-
-    delay(100);
-
-
 }

src/boards/Inkplate6Color.cpp

@@ -66,7 +66,6 @@ bool Inkplate::begin(void)
         if (!setPanelDeepSleep(false))
             return false;
 
-
         delay(1000);
     }
     else
@@ -360,9 +359,9 @@ void Inkplate::setIOExpanderForLowPower()
     ioBegin(IO_INT_ADDR, ioRegsInt);
 
     // TOUCHPAD PINS
-    pinModeInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_B2, INPUT);
-    pinModeInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_B3, INPUT);
-    pinModeInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_B4, INPUT);
+    pinModeInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_B2, OUTPUT);
+    pinModeInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_B3, OUTPUT);
+    pinModeInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_B4, OUTPUT);
 
     // Battery voltage Switch MOSFET
     pinModeInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_B1, OUTPUT);
@@ -385,7 +384,7 @@ void Inkplate::setIOExpanderForLowPower()
     digitalWriteInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_A0, LOW);
     digitalWriteInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_A1, LOW);
     digitalWriteInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_A2, LOW);
-    digitalWriteInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_A3, LOW);
+    digitalWriteInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_A3, LOW); 
     digitalWriteInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_A4, LOW);
     digitalWriteInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_A5, LOW);
     digitalWriteInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_A6, LOW);
@@ -396,17 +395,36 @@ void Inkplate::setIOExpanderForLowPower()
     digitalWriteInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_B7, LOW);
 }
 
+/**
+ * @brief       This function is added as a fix for low power for Inkplate 6COLOR
+ *              It further decreases the low-power current and makes waking up from sleep stable and
+ *              avoids a double-reset via brownout.
+ */
 void Inkplate::sleepColorPanel()
 {
-    Serial.println("putting the color panel to sleep...");
+    // First, put the ePaper to sleep
     delay(10);
     sendCommand(DEEP_SLEEP_REGISTER);
-    sendData(0x10);
     sendData(0xA5);
-    delay(100);
-    digitalWrite(EPAPER_RST_PIN, LOW);
-    digitalWrite(EPAPER_DC_PIN, LOW);
-    digitalWrite(EPAPER_CS_PIN, LOW);
+    delay(100); // Wait a bit until it's surely in sleep
+
+    // End the SPI used to communicate with the ePaper
+    epdSPI.end();
+    delay(5);
+
+    // Set the SPI pins as INPUT as they have hw pull-ups
+    pinMode(EPAPER_RST_PIN, INPUT);
+    pinMode(EPAPER_DC_PIN, INPUT);
+    pinMode(EPAPER_CS_PIN, INPUT);
+
+    // Make sure the SD card is in sleep
+    sdCardSleep();
+    delay(10);
+
+    // Make sure VBAT is disabled
+    pinModeInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_B1, OUTPUT);
+    digitalWriteInternal(IO_INT_ADDR, ioRegsInt, IO_PIN_B1, LOW);
+    delay(10);
 }
 
 #endif