From e30fd59f1c4fc414e302ad88e94cfd18748ef9c8 Mon Sep 17 00:00:00 2001
From: Patedam <pgillen.pro@gmail.com>
Date: Mon, 30 Mar 2026 22:27:49 -0400
Subject: [PATCH] fixed using 0xff for white + removed lot of crap from
 previous tries. Basicaly 0x50 need 0x29 as data to invert polarity (white 0
 -> 1) + CDI-9 for proper interval

---
 components/epd/epd.cpp | 84 +++++++++---------------------------------
 components/epd/epd.hpp |  2 +-
 2 files changed, 19 insertions(+), 67 deletions(-)

diff --git a/components/epd/epd.cpp b/components/epd/epd.cpp
index e0b4344..9c5cf8a 100644
--- a/components/epd/epd.cpp
+++ b/components/epd/epd.cpp
@@ -17,7 +17,9 @@ internal void epd_spi_init(void)
 {
   // 1. Initialize the SPI Bus
   spi_bus_config_t buscfg = {};
-  buscfg.miso_io_num = TFT_MISO; // Initialize MISO as input, matching `spi.begin(TFT_SCLK, TFT_MISO, TFT_MOSI, -1)`
+  buscfg.miso_io_num =
+      TFT_MISO; // Initialize MISO as input, matching `spi.begin(TFT_SCLK,
+                // TFT_MISO, TFT_MOSI, -1)`
   buscfg.mosi_io_num = TFT_MOSI;
   buscfg.sclk_io_num = TFT_SCLK;
   buscfg.quadwp_io_num = -1;
@@ -119,68 +121,16 @@ void epd_shutdown(void)
   spi_bus_free(SPI2_HOST);
 }
 
-internal void epd_seeed_init_fast()
-{
-  epd_writecommand(0x01); // POWER SETTING
-  epd_writedata(0x07);
-  epd_writedata(0x07); // VGH=20V,VGL=-20V
-  epd_writedata(0x3f); // VDH=15V
-  epd_writedata(0x3f); // VDL=-15V
-
-  epd_writecommand(0x06); // Booster Soft Start
-  epd_writedata(0x17);
-  epd_writedata(0x17);
-  epd_writedata(0x28);
-  epd_writedata(0x17);
-
-  epd_writecommand(0x04); // POWER ON
-  vTaskDelay(pdMS_TO_TICKS(100));
-  epd_wait_until_idle();
-
-  epd_writecommand(0X00); // PANEL SETTING
-  epd_writedata(0x1F);    // KW-3f KWR-2F BWROTP 0f BWOTP 1f
-
-  epd_writecommand(0x61); // TRES
-  epd_writedata(EPD_WIDTH >> 8);
-  epd_writedata(EPD_WIDTH & 0xFF);
-  epd_writedata(EPD_HEIGHT >> 8);
-  epd_writedata(EPD_HEIGHT & 0xFF);
-
-  epd_writecommand(0x50); // VCOM AND DATA INTERVAL SETTING
-  epd_writedata(0x10);
-  epd_writedata(0x07);
-
-  epd_writecommand(0xE0); // Active Temperature
-  epd_writedata(0x02);
-
-  epd_writecommand(0xE5); // Input Temperature
-  epd_writedata(0x55);
-}
-
-internal void epd_wakeup()
-{
-  gpio_set_level((gpio_num_t)TFT_RST, 0);
-  vTaskDelay(pdMS_TO_TICKS(10));
-  gpio_set_level((gpio_num_t)TFT_RST, 1);
-  vTaskDelay(pdMS_TO_TICKS(10));
-  epd_wait_until_idle();
-  epd_seeed_init_fast();
-}
-
 void epd_init_display()
 {
   g_is_asleep = false;
 
-  // 1. From initFromSleep() - Put SPI bus in known state for TFT with CS tied low
-  epd_writecommand(0x00); 
-  gpio_set_level((gpio_num_t)TFT_RST, 1);
-  vTaskDelay(pdMS_TO_TICKS(5));
+  // Module reset
   gpio_set_level((gpio_num_t)TFT_RST, 0);
-  vTaskDelay(pdMS_TO_TICKS(20));
+  vTaskDelay(pdMS_TO_TICKS(10));
   gpio_set_level((gpio_num_t)TFT_RST, 1);
-  vTaskDelay(pdMS_TO_TICKS(150)); // Wait for reset to complete
+  vTaskDelay(pdMS_TO_TICKS(10));
 
-  // 2. From init() -> UC8179_Init.h
   epd_writecommand(0x01); // POWER SETTING
   epd_writedata(0x07);
   epd_writedata(0x07);
@@ -198,7 +148,7 @@ void epd_init_display()
   epd_wait_until_idle();
 
   epd_writecommand(0X00); // PANEL SETTING
-  epd_writedata(0x1F);    
+  epd_writedata(0x1F);
 
   epd_writecommand(0x61); // TRES
   epd_writedata(EPD_WIDTH >> 8);
@@ -210,14 +160,11 @@ void epd_init_display()
   epd_writedata(0x00);
 
   epd_writecommand(0x50); // VCOM AND DATA INTERVAL SETTING
-  epd_writedata(0x10);
+  epd_writedata(0x29); // DDX=10 (Invert polarity) and CDI=9 (Proper interval)
   epd_writedata(0x07);
 
   epd_writecommand(0x60); // TCON SETTING
   epd_writedata(0x22);
-
-  // 3. EPaper::begin(0) then correctly calls EPD_WAKEUP()
-  epd_wakeup();
 }
 
 void epd_shutdown_display(void)
@@ -253,15 +200,18 @@ void epd_clear(epd_color_t level)
 {
   assert(!g_is_asleep);
 
+  // Directly pass the color preference to hardware (hardware polarity is
+  // configured in DDX)
   uint8 color_byte = static_cast<uint8>(level);
   ESP_LOGI(kTagEPD, "Clearing display (byte=0x%02X)", color_byte);
 
   constexpr size_t total_bytes = (EPD_WIDTH * EPD_HEIGHT) / 8;
-  uint8 chunk[256];
-  memset(chunk, color_byte, sizeof(chunk));
 
-  auto write_layer = [&](uint8 cmd)
+  auto write_layer = [&](uint8 cmd, uint8 fill_byte)
   {
+    uint8 chunk[256];
+    memset(chunk, fill_byte, sizeof(chunk));
+
     epd_writecommand(cmd);
     size_t remaining = total_bytes;
     int chunk_count = 0;
@@ -276,8 +226,10 @@ void epd_clear(epd_color_t level)
     }
   };
 
-  write_layer(0x10); // Old data layer
-  write_layer(0x13); // New data layer
+  write_layer(
+      0x10,
+      0xFF); // Old data layer (0xFF is mapped to White under new polarity)
+  write_layer(0x13, color_byte); // New data layer
 
   ESP_LOGI(kTagEPD, "Data transmission complete (Refresh required)");
 }
\ No newline at end of file
diff --git a/components/epd/epd.hpp b/components/epd/epd.hpp
index b55622b..f990c10 100644
--- a/components/epd/epd.hpp
+++ b/components/epd/epd.hpp
@@ -1,4 +1,4 @@
-// DRIVER FOR UC8179
+// DRIVER FOR UC8179 + GDEY075T7
 #pragma once
 
 #include "sdkconfig.h"