ESP32 Pixelflut client

 1#include "WiFi.h"
 2#include <SD_MMC.h>
 3#include <TJpg_Decoder.h>
 4
 5
 6const char* ssid = "....";
 7const char* password = "....";
 8const char* server = "....";
 9int port = ....;
10
11
12#define SD_DATA 40
13#define SD_CLK 39
14#define SD_CMD 38
15
16
17const char* image = "/image.jpg";
18
19
20WiFiClient client;
21
22
23void initWiFi() {
24  WiFi.mode(WIFI_STA);
25  WiFi.begin(ssid, password);
26  Serial.print("Connecting to WiFi ..");
27  while (WiFi.status() != WL_CONNECTED) {
28    Serial.print('.');
29    delay(1000);
30  }
31  Serial.println(WiFi.localIP());
32}
33
34void initSDCard() {
35  SD_MMC.setPins(SD_CLK, SD_CMD, SD_DATA);
36  if (!SD_MMC.begin("/sdcard", true)) {  
37    Serial.println("Card failed, or not present");
38    return;
39  }
40  Serial.println("SD card initialized via SDMMC.");
41}
42
43bool tft_output(int16_t x, int16_t y, uint16_t w, uint16_t h, uint16_t *bitmap) {
44  for (int16_t i = 0; i < w * h; i++) {
45    uint16_t color = bitmap[i];
46    
47    uint8_t r = (color >> 8) & 0xF8;
48    uint8_t g = (color >> 3) & 0xFC;
49    uint8_t b = (color << 3) & 0xF8;
50    
51    char colorHex[7];
52    sprintf(colorHex, "%02X%02X%02X", r, g, b);
53
54    client.print("PX ");
55    client.print(x + (i % w));  
56    client.print(" ");
57    client.print(y + (i / w));  
58    client.print(" ");
59    client.println(colorHex);   
60  }
61
62  return true;
63}
64
65void setup() {
66  Serial.begin(115200);
67  initSDCard();
68  initWiFi();
69  
70  if(!client.connect(server, port)){
71      Serial.println("Connection to host failed");
72      delay(1000);
73      return;
74  }
75  
76  Serial.println("Connected to pixelflut server successfully");
77
78  File jpegFile = SD_MMC.open(image);
79
80  TJpgDec.setJpgScale(1);
81  TJpgDec.setCallback(tft_output);
82  
83  uint32_t t = millis();
84
85  if (TJpgDec.drawSdJpg(400, 0,  jpegFile) != 0) {
86    Serial.println("Failed to decode JPEG");
87  }
88
89  t = millis() - t;
90  Serial.print("Done! took ");
91  Serial.print(t); 
92  Serial.println(" ms to complete");
93  client.stop();
94}
95
96void loop() {
97
98}