ST7789 DMA configuration: Yellow displayed instead of red

[Ygles09]

Hello,
I have a ESP32-S3-R8N16 board with a TFT screen 170x320. When I use Adafruit_GFX library everything works fine but I want to use DMA on the screen to have more reactivity and I try to display many thing but come back to the beginning and now I just want to display red screen but I have this:

IMG_20240610_151102_6.jpg (212.38 KiB) Viewed 424 times

I don't understand where is my error, can you help me please ? You can find my code here:

Code: [Select all] [Expand/Collapse]

1. #include <SPI.h>
2. #include "driver/spi_master.h"
3.  
4. #define TFT_CS 10
5. #define TFT_DC 11
6. #define TFT_MOSI 13
7. #define TFT_SCLK 12
8. #define TFT_RST 1
9. #define TFT_BL 14
10.  
11. #define WIDTH 170
12. #define HEIGHT 320
13.  
14. spi_device_handle_t spi;
15.  
16. void setup() {
17.   Serial.begin(115200);
18.  
19.   // Initialiser les broches
20.   pinMode(TFT_CS, OUTPUT);
21.   pinMode(TFT_DC, OUTPUT);
22.   pinMode(TFT_RST, OUTPUT);
23.   pinMode(TFT_BL, OUTPUT);
24.   digitalWrite(TFT_CS, HIGH);
25.   digitalWrite(TFT_BL, HIGH);
26.  
27.   // Configuration du SPI
28.   spi_bus_config_t buscfg = {
29.     .mosi_io_num = TFT_MOSI,
30.     .miso_io_num = -1,
31.     .sclk_io_num = TFT_SCLK,
32.     .quadwp_io_num = -1,
33.     .quadhd_io_num = -1,
34.     .max_transfer_sz = WIDTH * HEIGHT * 2
35.   };
36.  
37.   spi_device_interface_config_t devcfg = {
38.     .mode = 0,
39.     .clock_speed_hz = 20 * 1000 * 1000,
40.     .spics_io_num = TFT_CS,
41.     .queue_size = 7,
42.     .pre_cb = NULL,
43.     .post_cb = NULL,
44.   };
45.  
46.   esp_err_t ret = spi_bus_initialize(SPI3_HOST, &buscfg, SPI_DMA_CH_AUTO);
47.   if (ret != ESP_OK) {
48.     Serial.printf("Failed to initialize bus: %s\n", esp_err_to_name(ret));
49.     while (1)
50.       ;
51.   }
52.  
53.   ret = spi_bus_add_device(SPI3_HOST, &devcfg, &spi);
54.   if (ret != ESP_OK) {
55.     Serial.printf("Failed to add device: %s\n", esp_err_to_name(ret));
56.     while (1)
57.       ;
58.   }
59.  
60.   // Reset
61.   digitalWrite(TFT_RST, LOW);
62.   delay(100);
63.   digitalWrite(TFT_RST, HIGH);
64.   delay(100);
65.  
66.   // Init
67.   sendCommand(0x01);      // Software reset
68.   delay(150);
69.   sendCommand(0x11);      // Sleep out
70.   delay(500);
71.   sendCommand(0x36);      // Memory data access control
72.   sendData(0x00);
73.   sendCommand(0x3A);      // Interface pixel format
74.   sendData(0x55);         // 16-bit/pixel
75.   sendCommand(0x29);      // Display on
76.   sendCommand(0x13);      // Normal display
77. }
78.  
79. void sendCommand(uint8_t cmd) {
80.   digitalWrite(TFT_DC, LOW);
81.   digitalWrite(TFT_CS, LOW);
82.   spi_transaction_t t;
83.   memset(&t, 0, sizeof(t));
84.   t.length = 8;
85.   t.tx_buffer = &cmd;
86.   spi_device_transmit(spi, &t);
87.   digitalWrite(TFT_CS, HIGH);
88. }
89.  
90. void sendData(uint8_t data) {
91.   digitalWrite(TFT_DC, HIGH);
92.   digitalWrite(TFT_CS, LOW);
93.   spi_transaction_t t;
94.   memset(&t, 0, sizeof(t));
95.   t.length = 8;
96.   t.tx_buffer = &data;
97.   spi_device_transmit(spi, &t);
98.   digitalWrite(TFT_CS, HIGH);
99. }
100.  
101. void loop() {
102.   sendCommand(0x2A);  // Column address set
103.   sendData(0x00);
104.   sendData(0x23);     // Offset because there is 35px before and after ((240 - 170) / 2)
105.   sendData(0x00);
106.   sendData(0xCC);
107.  
108.   sendCommand(0x2B);  // Row address set
109.   sendData(0x00);
110.   sendData(0x00);
111.   sendData((HEIGHT - 1) >> 8);
112.   sendData((HEIGHT - 1) & 0xFF);
113.  
114.   sendCommand(0x2C);  // Memory write
115.  
116.   digitalWrite(TFT_CS, LOW);
117.   delay(100);
118.   digitalWrite(TFT_DC, HIGH);
119.   delay(100);
120.  
121.   uint16_t lineBuffer[WIDTH];
122.   for (int y = 0; y < HEIGHT; y++) {
123.     for (int x = 0; x < WIDTH; x++) {
124.       // RED in RGB565
125.       lineBuffer[x] = 0xF800;
126.     }
127.     sendLine(lineBuffer);
128.   }
129.  
130.   delay(500);
131. }
132.  
133. void sendLine(uint16_t* lineBuffer) {
134.   digitalWrite(TFT_DC, HIGH);
135.   digitalWrite(TFT_CS, LOW);
136.  
137.   spi_transaction_t t;
138.   memset(&t, 0, sizeof(t));
139.   t.length = WIDTH * 16;
140.   t.tx_buffer = lineBuffer;
141.  
142.   spi_device_transmit(spi, &t);
143.  
144.   digitalWrite(TFT_CS, HIGH);
145. }

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Thanks a lot

Ygles