code for ch32v203 eink calendar clock

CH32V203_eInk_Calendar_Clock/CH32V203_eInk_Calendar_Clock.ino

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+// SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include <Arduino.h>
+#include <SPI.h>
+#include "Adafruit_TinyUSB.h"
+#include "Adafruit_ThinkInk.h"
+#include "RTClib.h"
+#include <Wire.h>
+#include <Fonts/FreeSans24pt7b.h>
+#include <Fonts/FreeSans18pt7b.h>
+#include <Fonts/FreeSans12pt7b.h>
+
+#define EPD_DC PA3
+#define EPD_CS PA2
+#define EPD_BUSY -1 // can set to -1 to not use a pin (will wait a fixed delay)
+#define SRAM_CS PA1
+#define EPD_RESET -1  // can set to -1 and share with microcontroller Reset!
+#define EPD_SPI &SPI // primary SPI
+
+// 1.54" Monochrome displays with 200x200 pixels and SSD1681 chipset
+ThinkInk_154_Mono_D67 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY, EPD_SPI);
+
+RTC_DS3231 rtc;
+
+char daysOfTheWeek[7][4] = {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};
+char monthsOfYear[13][4] = {"NULL", "JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"};
+
+bool start = true;
+
+String lastTimeStr = "00:00";
+
+void setup() {
+  Serial.begin(115200);
+
+  /*while (!Serial) {
+    delay(10);
+  }*/
+  Serial.println("eInk Calendar & Clock with CH32V203");
+  SPI.begin();
+  Serial.println("SPI started");
+  pinMode(EPD_CS, OUTPUT);
+  digitalWrite(EPD_CS, HIGH);
+
+  Wire.begin();
+  Serial.println("Wire started");
+  Serial.println("starting display, might take a bit..");
+  display.begin(THINKINK_MONO);
+  Serial.println("display started");
+
+  while (! rtc.begin()) {
+    Serial.println("Couldn't find RTC");
+    delay(10);
+  }
+}
+
+void loop() {
+    Serial.println("we did it!");
+    DateTime now = rtc.now();
+    Serial.println("read rtc");
+    char timeChar[6];
+    sprintf(timeChar, "%02d:%02d", now.hour(), now.minute());
+    String timeStr = String(timeChar);
+    String monthStr = monthsOfYear[now.month()];
+    String dateStr = String(now.day());
+    String yearStr = String(now.year());
+    String dayOfWeekStr = daysOfTheWeek[now.dayOfTheWeek()];
+    Serial.println(timeStr);
+    int16_t x1, y1;
+    uint16_t w, h;
+    if (lastTimeStr != timeStr) {
+      display.clearBuffer();
+      display.fillRect(0, 0, 200, 60, EPD_BLACK);
+      display.drawRect(0, 0, 200, 170, EPD_BLACK);
+      display.setTextColor(EPD_WHITE);
+      display.setFont(&FreeSans24pt7b);
+      display.getTextBounds(dayOfWeekStr.c_str(), 0, 0, &x1, &y1, &w, &h);
+      display.setCursor((200 - w) / 2, (60 - h) / 2 + h);
+      display.println(dayOfWeekStr);
+      display.setTextColor(EPD_BLACK);
+      display.getTextBounds(dateStr.c_str(), 0, 0, &x1, &y1, &w, &h);
+      display.setCursor((200 - w) / 2, (170 - h) / 2 + h + 28);
+      display.println(dateStr);
+      display.setFont(&FreeSans18pt7b);
+      display.getTextBounds(monthStr.c_str(), 0, 0, &x1, &y1, &w, &h);
+      display.setCursor((200 - w) / 2, (60 + h) + 3);
+      display.println(monthStr);
+      display.getTextBounds(yearStr.c_str(), 0, 0, &x1, &y1, &w, &h);
+      display.setCursor((200 - w) / 2, (170 - h) - 5 + h);
+      display.println(yearStr);
+      display.setFont(&FreeSans12pt7b);
+      display.getTextBounds(timeStr.c_str(), 0, 0, &x1, &y1, &w, &h);
+      display.setCursor((200 - w) / 2, (200 - h) - 5 + h);
+      display.println(timeStr);
+      display.display();
+      lastTimeStr = timeStr;
+    }
+    delay(30000);
+}