initial working code

Adafruit_ST7796S.cpp

@@ -0,0 +1,159 @@
+// Adafruit_ST7796S.cpp
+//
+// MIT License
+//
+// Copyright (c) 2025 Limor Fried/Ladyada for Adafruit Industries
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include "Adafruit_ST7796S.h"
+
+static const uint8_t PROGMEM st7796s_init[] = {
+    14,                            // 14 commands
+    ST77XX_SWRESET, ST_CMD_DELAY, // Software reset
+    150,
+    0xF0, 1,                      // Unlock manufacturer
+    0xC3,
+    0xF0, 1,
+    0x96,
+    0xC5, 1,                      // VCOM Control
+    0x1C,
+    ST77XX_MADCTL, 1,             // Memory Access
+    0x48,
+    ST77XX_COLMOD, 1,             // Color Mode - 16 bit
+    0x55,
+    0xB0, 1,                      // Interface Control
+    0x80,
+    0xB4, 1,                      // Inversion Control
+    0x00,
+    0xB6, 3,                      // Display Function Control
+    0x80, 0x02, 0x3B,
+    0xB7, 1,                      // Entry Mode
+    0xC6,
+    0xF0, 1,                      // Lock manufacturer commands
+    0x69,
+    0xF0, 1,
+    0x3C,
+    ST77XX_SLPOUT, ST_CMD_DELAY,  // Exit sleep
+    150,
+    ST77XX_DISPON, ST_CMD_DELAY,  // Display on
+    150
+};
+
+/**
+ * @brief Constructor with software SPI.
+ * @param CS Chip select pin.
+ * @param RS Data/command pin.
+ * @param MOSI SPI MOSI pin.
+ * @param SCLK SPI clock pin.
+ * @param RST Reset pin (optional).
+ */
+Adafruit_ST7796S::Adafruit_ST7796S(int8_t CS, int8_t RS, int8_t MOSI, int8_t SCLK, int8_t RST)
+    : Adafruit_ST77xx(ST7796S_TFTWIDTH, ST7796S_TFTHEIGHT, CS, RS, MOSI, SCLK, RST) {}
+
+/**
+ * @brief Constructor with hardware SPI.
+ * @param CS Chip select pin.
+ * @param RS Data/command pin.
+ * @param RST Reset pin (optional).
+ */
+Adafruit_ST7796S::Adafruit_ST7796S(int8_t CS, int8_t RS, int8_t RST)
+    : Adafruit_ST77xx(ST7796S_TFTWIDTH, ST7796S_TFTHEIGHT, CS, RS, RST) {}
+
+#if !defined(ESP8266)
+/**
+ * @brief Constructor with hardware SPI and custom SPI class.
+ * @param spiClass Pointer to SPI class.
+ * @param CS Chip select pin.
+ * @param RS Data/command pin.
+ * @param RST Reset pin (optional).
+ */
+Adafruit_ST7796S::Adafruit_ST7796S(SPIClass *spiClass, int8_t CS, int8_t RS, int8_t RST)
+    : Adafruit_ST77xx(ST7796S_TFTWIDTH, ST7796S_TFTHEIGHT, spiClass, CS, RS, RST) {}
+#endif
+
+/**
+ * @brief Initialize the display.
+ * @param width Display width in pixels.
+ * @param height Display height in pixels.
+ * @param rowOffset Row offset for display.
+ * @param colOffset Column offset for display.
+ * @param colorOrder Color order (RGB or BGR).
+ */
+void Adafruit_ST7796S::init(uint16_t width, uint16_t height, uint8_t rowOffset, uint8_t colOffset,
+                             ST7796S_ColorOrder colorOrder) {
+    _width = width;
+    _height = height;
+    _rowstart = rowOffset;
+    _colstart = colOffset;
+    _colorOrder = colorOrder;
+    windowWidth = width;
+    windowHeight = height;
+
+    commonInit(NULL);
+    displayInit(st7796s_init);
+    invertOnCommand = ST77XX_INVOFF;
+    invertOffCommand = ST77XX_INVON;
+    invertDisplay(false);
+    setRotation(0);
+}
+
+/**
+ * @brief Set the display rotation.
+ * @param m Rotation value (0-3).
+ */
+void Adafruit_ST7796S::setRotation(uint8_t m) {
+    uint8_t madctl = 0;
+
+    rotation = m & 3; // can't be higher than 3
+
+    switch (rotation) {
+    case 0:
+        madctl = ST77XX_MADCTL_MX | ST77XX_MADCTL_RGB | _colorOrder;
+        _xstart = _colstart;
+        _ystart = _rowstart;
+        _width = windowWidth;
+        _height = windowHeight;
+        break;
+    case 1:
+        madctl = ST77XX_MADCTL_MV | ST77XX_MADCTL_RGB | _colorOrder;
+        _xstart = _rowstart;
+        _ystart = _colstart;
+        _height = windowWidth;
+        _width = windowHeight;
+        break;
+    case 2:
+        madctl = ST77XX_MADCTL_MY | ST77XX_MADCTL_RGB | _colorOrder;
+        _xstart = _colstart;
+        _ystart = _rowstart;
+        _width = windowWidth;
+        _height = windowHeight;
+        break;
+    case 3:
+        madctl = ST77XX_MADCTL_MY | ST77XX_MADCTL_MX | ST77XX_MADCTL_MV | ST77XX_MADCTL_RGB | _colorOrder;
+        _xstart = _rowstart;
+        _ystart = _colstart;
+        _height = windowWidth;
+        _width = windowHeight;
+        break;
+    }
+
+    Serial.println(madctl, HEX);
+    sendCommand(ST77XX_MADCTL, &madctl, 1);
+}

Adafruit_ST7796S.h

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+// Adafruit_ST7796S.h
+//
+// MIT License
+//
+// Copyright (c) 2025 Limor Fried/Ladyada for Adafruit Industries
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#ifndef _ADAFRUIT_ST7796S_H_
+#define _ADAFRUIT_ST7796S_H_
+
+#include "Adafruit_ST77xx.h"
+
+#define ST7796S_TFTWIDTH 320
+#define ST7796S_TFTHEIGHT 480
+
+// ST7796S specific commands
+#define ST7796S_RGBCTRL 0xB1
+#define ST7796S_FRMCTR1 0xB2
+#define ST7796S_PWCTRL1 0xC0
+#define ST7796S_PWCTRL2 0xC1
+#define ST7796S_VMCTRL1 0xC5
+#define ST7796S_VMCTRL2 0xC7
+#define ST7796S_PGAMCTRL 0xE0
+#define ST7796S_NGAMCTRL 0xE1
+
+/**
+ * @brief Enum for ST7796S color order.
+ */
+enum ST7796S_ColorOrder {
+    ST7796S_RGB = 0x00, ///< Red-Green-Blue color order
+    ST7796S_BGR = 0x08  ///< Blue-Green-Red color order
+};
+
+/**
+ * @brief Adafruit driver for the ST7796S TFT display.
+ */
+class Adafruit_ST7796S : public Adafruit_ST77xx {
+  public:
+    Adafruit_ST7796S(int8_t CS, int8_t RS, int8_t MOSI, int8_t SCLK, int8_t RST = -1);
+    Adafruit_ST7796S(int8_t CS, int8_t RS, int8_t RST = -1);
+#if !defined(ESP8266)
+    Adafruit_ST7796S(SPIClass *spiClass, int8_t CS, int8_t RS, int8_t RST);
+#endif
+
+    void init(uint16_t width = ST7796S_TFTWIDTH,
+              uint16_t height = ST7796S_TFTHEIGHT,
+              uint8_t rowOffset = 0,
+              uint8_t colOffset = 0,
+              ST7796S_ColorOrder colorOrder = ST7796S_RGB);
+
+    void setRotation(uint8_t r);
+
+  private:
+    ST7796S_ColorOrder _colorOrder; ///< Color order setting.
+    uint16_t windowWidth, windowHeight; ///< Dimensions of the display window.
+};
+
+#endif