First working Elekstube IPS and RTC mod

usermods/EleksTube_IPS/ChipSelect.h

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+#ifndef CHIP_SELECT_H
+#define CHIP_SELECT_H
+
+#include "Hardware.h"
+
+/*
+ * `digit`s are as defined in Hardware.h, 0 == seconds ones, 5 == hours tens.
+ */
+
+class ChipSelect {
+private:
+  uint8_t digits_map;
+  const uint8_t all_on = 0x3F;
+  const uint8_t all_off = 0x00;
+public:
+  ChipSelect() : digits_map(all_off) {}
+  
+  void update() {
+    // Documented in README.md.  Q7 and Q6 are unused. Q5 is Seconds Ones, Q0 is Hours Tens.
+    // Q7 is the first bit written, Q0 is the last.  So we push two dummy bits, then start with
+    // Seconds Ones and end with Hours Tens.
+    // CS is Active Low, but digits_map is 1 for enable, 0 for disable.  So we bit-wise NOT first.
+
+    uint8_t to_shift = (~digits_map) << 2;
+
+    digitalWrite(CSSR_LATCH_PIN, LOW);
+    shiftOut(CSSR_DATA_PIN, CSSR_CLOCK_PIN, LSBFIRST, to_shift);
+    digitalWrite(CSSR_LATCH_PIN, HIGH);
+  }
+
+    void begin() 
+  {
+    pinMode(CSSR_LATCH_PIN, OUTPUT);
+    pinMode(CSSR_DATA_PIN, OUTPUT);
+    pinMode(CSSR_CLOCK_PIN, OUTPUT);
+
+    digitalWrite(CSSR_DATA_PIN, LOW);
+    digitalWrite(CSSR_CLOCK_PIN, LOW);
+    digitalWrite(CSSR_LATCH_PIN, LOW);
+    update();
+  }
+
+  // These speak the indexes defined in Hardware.h.
+  // So 0 is disabled, 1 is enabled (even though CS is active low, this gets mapped.)
+  // So bit 0 (LSB), is index 0, is SECONDS_ONES
+  // Translation to what the 74HC595 uses is done in update()
+  void setDigitMap(uint8_t map, bool update_=true)   { digits_map = map; if (update_) update(); }
+  uint8_t getDigitMap()                        { return digits_map; }
+
+  // Helper functions
+  // Sets just the one digit by digit number
+  void setDigit(uint8_t digit, bool update_=true) { setDigitMap(0x01 << digit, update_); }
+  void setAll(bool update_=true)                  { setDigitMap(all_on,  update_); }
+  void clear(bool update_=true)                   { setDigitMap(all_off, update_); }
+  void setSecondsOnes()                           { setDigit(SECONDS_ONES); }
+  void setSecondsTens()                           { setDigit(SECONDS_TENS); }
+  void setMinutesOnes()                           { setDigit(MINUTES_ONES); }
+  void setMinutesTens()                           { setDigit(MINUTES_TENS); }
+  void setHoursOnes()                             { setDigit(HOURS_ONES); }
+  void setHoursTens()                             { setDigit(HOURS_TENS); }
+  bool isSecondsOnes()                            { return (digits_map&SECONDS_ONES_MAP > 0); }
+  bool isSecondsTens()                            { return (digits_map&SECONDS_TENS_MAP > 0); }
+  bool isMinutesOnes()                            { return (digits_map&MINUTES_ONES_MAP > 0); }
+  bool isMinutesTens()                            { return (digits_map&MINUTES_TENS_MAP > 0); }
+  bool isHoursOnes()                              { return (digits_map&HOURS_ONES_MAP > 0); }
+  bool isHoursTens()                              { return (digits_map&HOURS_TENS_MAP > 0); }
+};
+
+
+#endif // CHIP_SELECT_H

usermods/EleksTube_IPS/Hardware.h

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+/*
+ * Define the hardware for the EleksTube IPS clock.  Mostly pin definitions
+ */
+#ifndef ELEKSTUBEHAX_HARDWARE_H
+#define ELEKSTUBEHAX_HARDWARE_H
+
+#include <stdint.h> 
+#include <Arduino.h> // for HIGH and LOW
+
+// Common indexing scheme, used to identify the digit
+#define SECONDS_ONES (0)
+#define SECONDS_TENS (1)
+#define MINUTES_ONES (2)
+#define MINUTES_TENS (3)
+#define HOURS_ONES   (4)
+#define HOURS_TENS   (5)
+#define NUM_DIGITS   (6)
+
+#define SECONDS_ONES_MAP (0x01 << SECONDS_ONES)
+#define SECONDS_TENS_MAP (0x01 << SECONDS_TENS)
+#define MINUTES_ONES_MAP (0x01 << MINUTES_ONES)
+#define MINUTES_TENS_MAP (0x01 << MINUTES_TENS)
+#define HOURS_ONES_MAP   (0x01 << HOURS_ONES)
+#define HOURS_TENS_MAP   (0x01 << HOURS_TENS)
+
+// WS2812 (or compatible) LEDs on the back of the display modules.
+#define BACKLIGHTS_PIN (12)
+
+// Buttons, active low, externally pulled up (with actual resistors!)
+#define BUTTON_LEFT_PIN (33)
+#define BUTTON_MODE_PIN (32)
+#define BUTTON_RIGHT_PIN (35)
+#define BUTTON_POWER_PIN (34)
+
+// I2C to DS3231 RTC.
+#define RTC_SCL_PIN (22)
+#define RTC_SDA_PIN (21)
+
+// Chip Select shift register, to select the display
+#define CSSR_DATA_PIN (14)
+#define CSSR_CLOCK_PIN (16)
+#define CSSR_LATCH_PIN (17)
+
+// SPI to displays
+// DEFINED IN User_Setup.h
+// Look for: TFT_MOSI, TFT_SCLK, TFT_CS, TFT_DC, and TFT_RST
+
+// Power for all TFT displays are grounded through a MOSFET so they can all be turned off.
+// Active HIGH.
+#define TFT_ENABLE_PIN (27)
+
+#endif // ELEKSTUBEHAX_HARDWARE_H

usermods/EleksTube_IPS/TFTs.h

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+#ifndef TFTS_H
+#define TFTS_H
+
+#include <FS.h>
+
+#include <TFT_eSPI.h>
+#include "Hardware.h"
+#include "ChipSelect.h"
+
+class TFTs : public TFT_eSPI {
+private:
+  uint8_t digits[NUM_DIGITS];
+
+  // These read 16- and 32-bit types from the SD card file.
+  // BMP data is stored little-endian, Arduino is little-endian too.
+  // May need to reverse subscript order if porting elsewhere.
+
+  uint16_t read16(fs::File &f) {
+    uint16_t result;
+    ((uint8_t *)&result)[0] = f.read(); // LSB
+    ((uint8_t *)&result)[1] = f.read(); // MSB
+    return result;
+  }
+
+  uint32_t read32(fs::File &f) {
+    uint32_t result;
+    ((uint8_t *)&result)[0] = f.read(); // LSB
+    ((uint8_t *)&result)[1] = f.read();
+    ((uint8_t *)&result)[2] = f.read();
+    ((uint8_t *)&result)[3] = f.read(); // MSB
+    return result;
+  }
+
+  uint16_t output_buffer[TFT_HEIGHT][TFT_WIDTH];
+
+  // These BMP functions are stolen directly from the TFT_SPIFFS_BMP example in the TFT_eSPI library.
+  // Unfortunately, they aren't part of the library itself, so I had to copy them.
+  // I've modified drawBmp to buffer the whole image at once instead of doing it line-by-line.
+
+  //// BEGIN STOLEN CODE
+
+  bool drawBmp(const char *filename, int16_t x, int16_t y) {
+    // Nothing to do.
+    if ((x >= width()) || (y >= height())) return(true);
+
+    fs::File bmpFS;
+
+    // Open requested file on SD card
+    bmpFS = WLED_FS.open(filename, "r");
+
+    if (!bmpFS)
+    {
+      Serial.println(F("File not found"));
+      return(false);
+    }
+
+    uint32_t seekOffset;
+    int16_t w, h, row;
+    uint8_t  r, g, b;
+
+    uint16_t magic = read16(bmpFS);
+    if (magic == 0xFFFF) {
+      Serial.println(F("BMP not found!"));
+      bmpFS.close();
+      return(false);
+    }
+    
+    if (magic != 0x4D42) {
+      Serial.print(F("File not a BMP. Magic: "));
+      Serial.println(magic);
+      bmpFS.close();
+      return(false);
+    }
+
+    read32(bmpFS);
+    read32(bmpFS);
+    seekOffset = read32(bmpFS);
+    read32(bmpFS);
+    w = read32(bmpFS);
+    h = read32(bmpFS);
+
+    if ((read16(bmpFS) != 1) || (read16(bmpFS) != 24) || (read32(bmpFS) != 0)) {
+      Serial.println(F("BMP format not recognized."));
+      bmpFS.close();
+      return(false);
+    }
+
+    bool oldSwapBytes = getSwapBytes();
+    setSwapBytes(true);
+    bmpFS.seek(seekOffset);
+
+    uint16_t padding = (4 - ((w * 3) & 3)) & 3;
+    uint8_t lineBuffer[w * 3 + padding];
+    
+    // row is decremented as the BMP image is drawn bottom up
+    for (row = h-1; row >= 0; row--) {
+      if (row & 0b00000111 == 7) strip.service(); //still refresh backlight to mitigate stutter every few rows
+      bmpFS.read(lineBuffer, sizeof(lineBuffer));
+      uint8_t*  bptr = lineBuffer;
+      
+      // Convert 24 to 16 bit colours while copying to output buffer.
+      for (uint16_t col = 0; col < w; col++)
+      {
+        b = *bptr++;
+        g = *bptr++;
+        r = *bptr++;
+        output_buffer[row][col] = ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3);
+      }
+    }
+    
+    pushImage(x, y, w, h, (uint16_t *)output_buffer);
+    setSwapBytes(oldSwapBytes);
+
+    bmpFS.close();
+    return(true);
+  }
+
+public:
+  TFTs() : TFT_eSPI(), chip_select()
+    { for (uint8_t digit=0; digit < NUM_DIGITS; digit++) digits[digit] = 0; }
+
+  // no == Do not send to TFT. yes == Send to TFT if changed. force == Send to TFT.
+  enum show_t { no, yes, force };
+  // A digit of 0xFF means blank the screen.
+  const static uint8_t blanked = 255;
+  
+  void begin() {
+    pinMode(TFT_ENABLE_PIN, OUTPUT);
+    digitalWrite(TFT_ENABLE_PIN, HIGH); //enable displays on boot
+
+    // Start with all displays selected.
+    chip_select.begin();
+    chip_select.setAll();
+
+    // Initialize the super class.
+    init();
+  }
+
+  void showDigit(uint8_t digit) {
+    chip_select.setDigit(digit);
+
+    if (digits[digit] == blanked) {
+      fillScreen(TFT_BLACK);
+    }
+    else {
+      // Filenames are no bigger than "255.bmp\0"
+      char file_name[10];
+      sprintf(file_name, "/%d.bmp", digits[digit]);
+      drawBmp(file_name, 0, 0);
+    }
+  }
+
+  void setDigit(uint8_t digit, uint8_t value, show_t show=yes) {
+    uint8_t old_value = digits[digit];
+    digits[digit] = value;
+  
+    if (show != no && (old_value != value || show == force)) {
+      showDigit(digit);
+    }
+  }
+  uint8_t getDigit(uint8_t digit)                 { return digits[digit]; }
+
+  void showAllDigits()               { for (uint8_t digit=0; digit < NUM_DIGITS; digit++) showDigit(digit); }
+
+  // Making chip_select public so we don't have to proxy all methods, and the caller can just use it directly.
+  ChipSelect chip_select;
+};
+
+#endif // TFTS_H

usermods/EleksTube_IPS/User_Setup.h

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+/*
+ * This is intended to over-ride `User_Setup.h` that comes with the TFT_eSPI library.
+ * I hate having to modify the library code.
+ */
+
+// ST7789 135 x 240 display with no chip select line
+
+#define ST7789_DRIVER     // Configure all registers
+
+#define TFT_WIDTH  135
+#define TFT_HEIGHT 240
+
+#define CGRAM_OFFSET      // Library will add offsets required
+
+//#define TFT_RGB_ORDER TFT_RGB  // Colour order Red-Green-Blue
+//#define TFT_RGB_ORDER TFT_BGR  // Colour order Blue-Green-Red
+
+//#define TFT_INVERSION_ON
+//#define TFT_INVERSION_OFF
+
+// EleksTube IPS
+#define TFT_SDA_READ      // Read and write on the MOSI/SDA pin, no separate MISO pin
+#define TFT_MOSI 23
+#define TFT_SCLK 18
+//#define TFT_CS    -1 // Not connected
+#define TFT_DC   25  // Data Command, aka Register Select or RS
+#define TFT_RST  26  // Connect reset to ensure display initialises
+
+#define LOAD_GLCD   // Font 1. Original Adafruit 8 pixel font needs ~1820 bytes in FLASH
+//#define LOAD_FONT2  // Font 2. Small 16 pixel high font, needs ~3534 bytes in FLASH, 96 characters
+//#define LOAD_FONT4  // Font 4. Medium 26 pixel high font, needs ~5848 bytes in FLASH, 96 characters
+//#define LOAD_FONT6  // Font 6. Large 48 pixel font, needs ~2666 bytes in FLASH, only characters 1234567890:-.apm
+//#define LOAD_FONT7  // Font 7. 7 segment 48 pixel font, needs ~2438 bytes in FLASH, only characters 1234567890:.
+//#define LOAD_FONT8  // Font 8. Large 75 pixel font needs ~3256 bytes in FLASH, only characters 1234567890:-.
+//#define LOAD_FONT8N // Font 8. Alternative to Font 8 above, slightly narrower, so 3 digits fit a 160 pixel TFT
+//#define LOAD_GFXFF  // FreeFonts. Include access to the 48 Adafruit_GFX free fonts FF1 to FF48 and custom fonts
+
+//#define SMOOTH_FONT
+
+
+//#define SPI_FREQUENCY  27000000
+#define SPI_FREQUENCY  40000000
+
+/*
+ * To make the Library not over-write all this:
+ */
+#define USER_SETUP_LOADED

usermods/EleksTube_IPS/readme.md

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+# EleksTube IPS Clock usermod
+
+This usermod allows WLED to run on the EleksTube IPS clock.
+It enables running all WLED effects on the background SK6812 lighting, while displaying digit bitmaps on the 6 IPS screens.
+Code is largely based on https://github.com/SmittyHalibut/EleksTubeHAX by Mark Smith
+
+Supported:
+- Display with custom bitmaps from filesystem
+- Background lighting
+- Power button
+- RTC (with RTC usermod)
+- Standard WLED time features (NTP, DST, timezones)
+
+Not supported:
+- 3 navigation buttons, on-device setup
+
+## Installation 
+
+Compile and upload to clock using the `elekstube_ips` PlatformIO environment
+Once uploaded (the clock can be flashed like any ESP32 module), go to `[WLED-IP]/edit` and upload the 0-9.bmp files from the bmp folder.
+Use LED pin 12, relay pin 27 and button pin 34.

usermods/EleksTube_IPS/usermod_elekstube_ips.h

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+#pragma once
+#include "TFTs.h"
+#include "wled.h"
+
+class ElekstubeIPSUsermod : public Usermod {
+  private:
+    TFTs tfts;
+    void updateClockDisplay(TFTs::show_t show=TFTs::yes) {
+      uint8_t hr = hour(localTime);
+      uint8_t hrTens = hr/10;
+      uint8_t mi = minute(localTime);
+      uint8_t mittens = mi/10;
+      uint8_t s = second(localTime);
+      uint8_t sTens = s/10;
+      tfts.setDigit(HOURS_TENS, hrTens, show);
+      tfts.setDigit(HOURS_ONES, hr - hrTens*10, show);
+      tfts.setDigit(MINUTES_TENS, mittens, show);
+      tfts.setDigit(MINUTES_ONES, mi - mittens*10, show);
+      tfts.setDigit(SECONDS_TENS, sTens, show);
+      tfts.setDigit(SECONDS_ONES, s - sTens*10, show);
+    }
+    unsigned long lastTime = 0;
+  public:
+
+    void setup() {
+      tfts.begin();
+      tfts.fillScreen(TFT_BLACK);
+      tfts.setTextColor(TFT_WHITE, TFT_BLACK);
+      tfts.setCursor(0, 0, 2);
+      tfts.println("<STARTUP>");
+    }
+
+    void loop() {
+      if (lastTime == 0) {
+        tfts.fillScreen(TFT_BLACK);
+        updateClockDisplay(TFTs::force);
+      }
+      if (millis() - lastTime > 100) {
+        updateClockDisplay();
+        lastTime = millis();
+      }
+    }
+
+    uint16_t getId()
+    {
+      return USERMOD_ID_ELEKSTUBE_IPS;
+    }
+};