From 73d209a18bbc91764f7e7250b8a996e7d2b68b30 Mon Sep 17 00:00:00 2001
From: Gavin Higham <Gavin.Higham@gmail.com>
Date: Wed, 3 Feb 2021 00:06:50 -0800
Subject: [PATCH] Add support for Adafruit PiTFT 1.14"

---
 CMakeLists.txt      |  3 +++
 display.h           |  2 +-
 pitft_114r_st7789.h | 18 ++++++++++++++++++
 st7735r.cpp         |  6 +++---
 st7735r.h           | 13 ++++++++++++-
 5 files changed, 37 insertions(+), 5 deletions(-)
 create mode 100644 pitft_114r_st7789.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 235c70f..899739d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -202,6 +202,9 @@ elseif(FREEPLAYTECH_WAVESHARE32B)
 elseif(ADAFRUIT_HX8357D_PITFT)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DHX8357D -DADAFRUIT_HX8357D_PITFT")
 	message(STATUS "Targeting Adafruit 3.5 inch PiTFT with HX8357D")
+elseif (ADAFRUIT_ST7789_PITFT_114)
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DADAFRUIT_ST7789_PITFT_114")
+	message(STATUS "Targeting Adafruit 1.14 inch PiTFT with ST7789")
 elseif(WAVESHARE_ST7789VW_HAT)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DST7789 -DST7789VW -DWAVESHARE_ST7789VW_HAT")
 	message(STATUS "Targeting WaveShare 240x240 1.3inch IPS LCD Hat with ST7789VW controller")
diff --git a/display.h b/display.h
index ff0bd72..dd0bdf6 100644
--- a/display.h
+++ b/display.h
@@ -15,7 +15,7 @@
 #include "ili9486.h"
 #elif defined(HX8357D)
 #include "hx8357d.h"
-#elif defined(ST7735R) || defined(ST7735S) || defined(ST7789) || defined(ST7789VW)
+#elif defined(ST7735R) || defined(ST7735S) || defined(ST7789) || defined(ST7789VW) || defined(ADAFRUIT_ST7789_PITFT_114)
 #include "st7735r.h"
 #elif defined(SSD1351)
 #include "ssd1351.h"
diff --git a/pitft_114r_st7789.h b/pitft_114r_st7789.h
new file mode 100644
index 0000000..f4ff191
--- /dev/null
+++ b/pitft_114r_st7789.h
@@ -0,0 +1,18 @@
+#pragma once
+
+// Data specific to Adafruit's PiTFT 1.14" display
+#ifdef ADAFRUIT_ST7789_PITFT_114
+
+#if !defined(GPIO_TFT_DATA_CONTROL)
+// Adafruit 1.14" 135x240 has display control on pin 25: https://learn.adafruit.com/adafruit-mini-pitft-135x240-color-tft-add-on-for-raspberry-pi/pinouts
+#define GPIO_TFT_DATA_CONTROL 25
+#endif
+
+#if !defined(GPIO_TFT_BACKLIGHT)
+// Adafruit 1.14" 135x240 has backlight on pin 22: https://learn.adafruit.com/adafruit-mini-pitft-135x240-color-tft-add-on-for-raspberry-pi/pinouts
+#define GPIO_TFT_BACKLIGHT 22
+#endif
+
+#define DISPLAY_SPI_DRIVE_SETTINGS (1 | BCM2835_SPI0_CS_CPOL | BCM2835_SPI0_CS_CPHA)
+
+#endif
diff --git a/st7735r.cpp b/st7735r.cpp
index ceac386..f1ee8d5 100644
--- a/st7735r.cpp
+++ b/st7735r.cpp
@@ -1,6 +1,6 @@
 #include "config.h"
 
-#if defined(ST7735R) || defined(ST7735S) || defined(ST7789)
+#if defined(ST7735R) || defined(ST7735S) || defined(ST7789) || defined(ADAFRUIT_ST7789_PITFT_114)
 
 #include "spi.h"
 
@@ -69,7 +69,7 @@ void InitST7735R()
     SPI_TRANSFER(0x36/*MADCTL: Memory Access Control*/, madctl);
     usleep(10*1000);
 
-#ifdef ST7789
+#if defined(ST7789) || defined(ADAFRUIT_ST7789_PITFT_114)
     SPI_TRANSFER(0xBA/*DGMEN: Enable Gamma*/, 0x04);
     bool invertColors = true;
 #else
@@ -86,7 +86,7 @@ void InitST7735R()
     SPI_TRANSFER(0x13/*NORON: Partial off (normal)*/);
     usleep(10*1000);
 
-#ifdef ST7789
+#if defined(ST7789) || defined(ADAFRUIT_ST7789_PITFT_114)
     // The ST7789 controller is actually a unit with 320x240 graphics memory area, but only 240x240 portion
     // of it is displayed. Therefore if we wanted to swap row address mode above, writes to Y=0...239 range will actually land in
     // memory in row addresses Y = 319-(0...239) = 319...80 range. To view this range, we must scroll the view by +80 units in Y
diff --git a/st7735r.h b/st7735r.h
index 789b4b6..5941b7e 100644
--- a/st7735r.h
+++ b/st7735r.h
@@ -1,6 +1,7 @@
+
 #pragma once
 
-#if defined(ST7735R) || defined(ST7735S) || defined(ST7789) || defined(ST7789VW)
+#if defined(ST7735R) || defined(ST7735S) || defined(ST7789) || defined(ST7789VW) || defined(ADAFRUIT_ST7789_PITFT_114)
 
 // On Arduino "A000096" 160x128 ST7735R LCD Screen, the following speed configurations have been tested (on a Pi 3B):
 // core_freq=355: CDIV=6, results in 59.167MHz, works
@@ -30,6 +31,16 @@
 
 #define DISPLAY_NATIVE_COVERED_LEFT_SIDE 2
 #define DISPLAY_NATIVE_COVERED_TOP_SIDE 1
+#elif defined(ADAFRUIT_ST7789_PITFT_114)
+// The Adafruit PiTFT 1.14" uses ST7789, but it has some quirks, such as not working with the chip select signal toggle,
+// and having a unique offset in display memory.
+#include "pitft_114r_st7789.h"
+#define DISPLAY_NATIVE_WIDTH 240
+#define DISPLAY_NATIVE_HEIGHT 320
+#define DISPLAY_NATIVE_COVERED_TOP_SIDE 40
+#define DISPLAY_NATIVE_COVERED_BOTTOM_SIDE 40
+#define DISPLAY_NATIVE_COVERED_LEFT_SIDE 53
+#define DISPLAY_NATIVE_COVERED_RIGHT_SIDE 52
 
 #else
 #error Unknown display controller!