Saving progress on examples

Author: rsoric

examples/Advanced/DeepSleep/Inkplate_6_Motion_Deep_Sleep/Inkplate_6_Motion_Deep_Sleep.ino

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+/**
+ **************************************************
+ *
+ * @file        Inkplate_6_Motion_Deep_Sleep.ino
+ * @brief       How to use the low-power deep sleep feature on Inkplate 6MOTION
+ *              This sketch demonstrates the full features of Deep Sleep with all details
+ *              For a RTC+DeepSleep example check the RTC examples folder
+ *
+ * For info on how to quickly get started with Inkplate 6MOTION visit docs.inkplate.com
+ *
+ * @authors     Borna Biro and Robert Soric for soldered.com
+ * @date        January 2025
+ ***************************************************/
+
+// Include Inkplate Motion Library
+#include <InkplateMotion.h>
+
+// Include Soldered font
+#include "solderedFont30pt7b.h"
+
+// Create Inkplate object
+Inkplate inkplate;
+
+// Variable to store backup RAM data
+// Explained below, this is how you can store data between sleeps
+int value = 0;
+
+void setup()
+{
+    // Initialize Serial communication @ 115200 bauds
+    Serial.begin(115200);
+
+    // Write debug message
+    Serial.println("Inkplate started");
+
+    // Initialize Inkplate Motion library
+    inkplate.begin();
+
+    // Initialize STM32 RTC (needed for Backup RAM) without reseting the whole RTC
+    inkplate.rtc.begin(RTC_HOURFORMAT_24);
+
+    // Check if is this first time the example is run, reset the variable
+    if (!inkplate.rtc.isRTCSet())
+    {
+        // Initialize RTC and reset it! Otherwise, backup RAM will return wrong value
+        inkplate.rtc.begin(RTC_HOURFORMAT_24, true);
+
+        // Force RTC Set variable to run this part of the code only once
+        // The otherway to do this is to set the clock or date
+        inkplate.rtc.rtcSetFlag();
+
+        // Set variable stored in backup RAM to zero. This RAM is available between
+        // system resets, but also between power cycles (if RTC battery is provided)
+        inkplate.rtc.writeToBackupRAM(0, &value, sizeof(value));
+    }
+
+    // Set Soldered font
+    inkplate.setFont(&solderedFont30pt7b);
+
+    // Set text color to black with white background.
+    inkplate.setTextColor(BLACK, WHITE);
+
+    // Start printing text at X = 0, Y = 50
+    inkplate.setCursor(0, 50);
+
+    // Print the reset cause
+    printResetCause();
+
+    // Get the new value of the variable from the backup RAM
+    inkplate.rtc.readFromBackupRAM(0, &value, sizeof(value));
+
+    // Print some text on screen
+    inkplate.printf("Inkplate 6 MOTION deep sleep example.\nWoken up %d times.", value++);
+
+    // Store the new value
+    inkplate.rtc.writeToBackupRAM(0, &value, sizeof(value));
+
+    // Refresh the screen
+    inkplate.display();
+
+    // Check if the wake up from sleep did reset the board. If so, clear the flags
+    if (__HAL_PWR_GET_FLAG(PWR_FLAG_SB) != RESET)
+    {
+        // Clear Standby flag
+        __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);
+
+        // Wake-up button on Inkplate 6 Motion is PC13 = WAKEUP PIN 4.
+        HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN4);
+    }
+
+    // Enable wake up button. By setting PC13 to low (button press), Inkplate will wake up
+    HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN4_LOW);
+
+    // Print last message before goint to sleep
+    Serial.println("Going to sleep");
+    Serial.flush();
+
+    // Finally, enter in sleep mode (deep sleep, lowest current consumption, but data is not retained, after wake up,
+    // code starts from begining)
+    deepSleep(); // Code stops here!
+}
+
+void loop()
+{
+    // Nothing! Must be empty!
+}
+
+// This fucntion demonstrates the different reset causes
+// How to read them, and what they represent
+void printResetCause(void)
+{
+    uint32_t reset_cause = RCC->RSR; // Read the RSR register
+
+    inkplate.print("Reset cause(s):\n");
+
+    if (reset_cause & RCC_RSR_CPURSTF)
+    {
+        inkplate.printf("-CPU Reset\n");
+    }
+
+    if (reset_cause & RCC_RSR_D1RSTF)
+    {
+        inkplate.printf("-Deep sleep reset (D1)\n");
+    }
+
+    if (reset_cause & RCC_RSR_D2RSTF)
+    {
+        inkplate.printf("-Deep sleep reset (D2)\n");
+    }
+
+    if (reset_cause & RCC_RSR_BORRSTF)
+    {
+        inkplate.printf("-Brownout reset\n");
+    }
+
+    if (reset_cause & RCC_RSR_PINRSTF)
+    {
+        inkplate.printf("-Pin reset\n");
+    }
+
+    if (reset_cause & RCC_RSR_PORRSTF)
+    {
+        inkplate.printf("-Power-on reset\n");
+    }
+
+    if (reset_cause & RCC_RSR_SFTRSTF)
+    {
+        inkplate.printf("-Software reset\n");
+    }
+
+    if (reset_cause & RCC_RSR_IWDG1RSTF)
+    {
+        inkplate.printf("-Independent watchdog reset\n");
+    }
+
+    if (reset_cause & RCC_RSR_WWDG1RSTF)
+    {
+        inkplate.printf("-Window watchdog reset\n");
+    }
+
+
+    if (reset_cause & RCC_RSR_LPWRRSTF)
+    {
+        inkplate.printf("-Low-power reset\n");
+    }
+
+    // Clear the reset flags
+    __HAL_RCC_CLEAR_RESET_FLAGS();
+}
+
+// Deep sleep function. Calling this will put STM32 in deep sleep mode. If all peripherals are disabled
+// deep sleep current will be around 20-30uA
+void deepSleep()
+{
+    // Disable all peripherals including WiFi, microSD card, SDRAM, sensors etc
+    inkplate.peripheralState(INKPLATE_PERIPHERAL_ALL, false);
+
+    // Disable USB voltage detection on USB OTG (This causes high current consumption in sleep!)
+    HAL_PWREx_DisableUSBVoltageDetector();
+
+    // Use different voltage scale for internal voltage regulator (lower current consumption in sleep mode)
+    HAL_PWREx_ControlStopModeVoltageScaling(PWR_REGULATOR_SVOS_SCALE5);
+
+    // Put every domain into standby mode
+    HAL_PWREx_EnterSTANDBYMode(PWR_D3_DOMAIN);
+    HAL_PWREx_EnterSTANDBYMode(PWR_D2_DOMAIN);
+    HAL_PWREx_EnterSTANDBYMode(PWR_D1_DOMAIN);
+}