What MCU/Processor/Board and compiler are you using?
Board: ESP32-S3-N16R8 TFT: 4" ST7769S Compiler: PlatformIO
Code to reproduce
#include “display.h”
#include <Arduino.h>
#include “lvgl.h”
#include <SPI.h>
#include “ui/ui.h”
// — BACKLIGHT —
int BL_CHANNEL = 1; // frei wählbar
int BL_FREQ = 5000; // 5 kHz ideal für Backlight
int BL_RES = 8; // 0–255
SPIClass spi(HSPI);
/* — LVGL Display Handle — */
static lv_display_t *disp;
// — Backlight —
void initBacklight()
{
ledcSetup(BL_CHANNEL, BL_FREQ, BL_RES); ledcAttachPin(TFT_BL, BL_CHANNEL); // Startwert: 100% ledcWrite(BL_CHANNEL, 255);}
void setBacklightValue(int percent)
{
// MIN/MAX Überwachung if (percent < 10) percent = 10; if (percent > 100) percent = 100; // Prozent (10–100) → PWM (0–255) int pwm = (percent \* 255) / 100; ledcWrite(BL_CHANNEL, pwm);}
/* — ST7769 Commands — */
static void send_cmd(uint8_t cmd)
{
digitalWrite(TFT_DC, LOW); digitalWrite(TFT_CS, LOW); spi.write(cmd); digitalWrite(TFT_CS, HIGH);}
static void send_data(const uint8_t *data, uint32_t len)
{
digitalWrite(TFT_DC, HIGH); digitalWrite(TFT_CS, LOW); spi.writeBytes(data, len); digitalWrite(TFT_CS, HIGH);}
/* — Flush Callback für LVGL — */
static void flush_cb(lv_display_t *d, const lv_area_t *area, uint8_t *px_map)
{
uint16_t x1 = area->x1; uint16_t x2 = area->x2; uint16_t y1 = area->y1; uint16_t y2 = area->y2; uint8_t buf\[4\]; /\* Column address \*/ send_cmd(0x2A); buf\[0\] = x1 >> 8; buf\[1\] = x1 & 0xFF; buf\[2\] = x2 >> 8; buf\[3\] = x2 & 0xFF; send_data(buf, 4); /\* Row address \*/ send_cmd(0x2B); buf\[0\] = y1 >> 8; buf\[1\] = y1 & 0xFF; buf\[2\] = y2 >> 8; buf\[3\] = y2 & 0xFF; send_data(buf, 4); /\* Memory write \*/ send_cmd(0x2C); /\* Pixel-Daten senden \*/ send_data(px_map, (x2 - x1 + 1) \* (y2 - y1 + 1) \* 2); lv_display_flush_ready(d);}
/* — ST7769 Initialisierung — */
static void st7769_hw_init()
{
digitalWrite(TFT_RST, LOW); delay(50); digitalWrite(TFT_RST, HIGH); delay(50); /\* Memory Access Control (Rotation + Mirror + BGR) \*/ send_cmd(0x36); uint8_t madctl = 0x2C | 0x08; send_data(&madctl, 1); /\* Pixel Format \*/ send_cmd(0x3A); uint8_t pixfmt = 0x55; // 16-bit RGB565 send_data(&pixfmt, 1); send_cmd(0x21); // Inversion ON send_cmd(0x11); // Sleep Out delay(120); send_cmd(0x29); // Display ON}
/* — LVGL Display erstellen — */
lv_display_t *st7769_init()
{
pinMode(TFT_CS, OUTPUT); pinMode(TFT_DC, OUTPUT); pinMode(TFT_RST, OUTPUT); spi.begin(TFT_SCLK, TFT_MISO, TFT_MOSI, TFT_CS); spi.setFrequency(40000000); // 40 MHz stabil st7769_hw_init(); disp = lv_display_create(screenWidth, screenHeight); //lv_display_set_color_format(disp, LV_COLOR_FORMAT_RGB565_SWAPPED); static lv_color_t screen_buffer\[screenWidth \* 80\]; lv_display_set_buffers(disp, screen_buffer, NULL, sizeof(screen_buffer), LV_DISPLAY_RENDER_MODE_PARTIAL); lv_display_set_flush_cb(disp, flush_cb); return disp;}
void display_init()
{
lv_init(); st7769_init(); ui_init(); initBacklight(); setBacklightValue(90);}
void display_loop()
{
lv_task_handler();}
So i have wrong colors and i think no Screen-Updates (?) I have tried a lot of things, but now i have no idea and no solution found. It would be really nice if someone here has a solution and could help me out a lot with it. I’m grateful for any tip.
Here is the description of my TFT: https://www.lcdwiki.com/res/MSP4030_MSP4031/MSP4030_MSP4031_Specification_EN_V1.0.pdf
This is a Screenshot from SquareLine-Studio:
This is the output on my Screen:
