add basic SD-card support for reading files

arduino-sony-minidisc-ir-remote.ino

@@ -4,7 +4,7 @@
 
  Based on the the following sketches:
  - SimpleWifiServer example
- - SD_Test
+ - ESP32/SD_Test
  - IRremote/SendDemo
 
 
@@ -13,15 +13,26 @@
  http://yourAddress/L turns it off
 
 
-
  Circuit:
  * LED attached to pin 13 (optional)
  * IR Transmitter attached to pin 4 (connect to 5v or 3v3)
  * SD-Module to load HTML and CSS from SD-card
+ *
+ * Connect the SD card to the following pins:
+ *
+ * SD Card | ESP32
+ *  3v3      3.3V
+ *  CS       5
+ *  MOSI     23
+ *  CLK      18
+ *  MISO     19
+ *  GND      GND
 
  developed for the ESP32vn IoT Uni board 2024
- 
  */
+#include "FS.h"
+#include "SD.h"
+#include "SPI.h"
 
 #include <WiFi.h>
 #include <IRremote.hpp>
@@ -30,12 +41,153 @@
 
 WiFiServer server(80);
 
+
+/**** SD-Card Functions ****/ 
+void listDir(fs::FS &fs, const char * dirname, uint8_t levels){
+    Serial.printf("Listing directory: %s\n", dirname);
+
+    File root = fs.open(dirname);
+    if(!root){
+        Serial.println("Failed to open directory");
+        return;
+    }
+    if(!root.isDirectory()){
+        Serial.println("Not a directory");
+        return;
+    }
+
+    File file = root.openNextFile();
+    while(file){
+        if(file.isDirectory()){
+            Serial.print("  DIR : ");
+            Serial.println(file.name());
+            if(levels){
+                listDir(fs, file.path(), levels -1);
+            }
+        } else {
+            Serial.print("  FILE: ");
+            Serial.print(file.name());
+            Serial.print("  SIZE: ");
+            Serial.println(file.size());
+        }
+        file = root.openNextFile();
+    }
+}
+
+void readFile(fs::FS &fs, const char * path){
+    Serial.printf("Reading file: %s\n", path);
+
+    File file = fs.open(path);
+    if(!file){
+        Serial.println("Failed to open file for reading");
+        return;
+    }
+
+    Serial.print("Read from file: ");
+    while(file.available()){
+        Serial.write(file.read());
+    }
+    file.close();
+}
+
+void testFileIO(fs::FS &fs, const char * path){
+    File file = fs.open(path);
+    static uint8_t buf[512];
+    size_t len = 0;
+    uint32_t start = millis();
+    uint32_t end = start;
+    if(file){
+        len = file.size();
+        size_t flen = len;
+        start = millis();
+        while(len){
+            size_t toRead = len;
+            if(toRead > 512){
+                toRead = 512;
+            }
+            file.read(buf, toRead);
+            len -= toRead;
+        }
+        end = millis() - start;
+        Serial.printf("%u bytes read for %u ms\n", flen, end);
+        file.close();
+    } else {
+        Serial.println("Failed to open file for reading");
+    }
+
+
+    file = fs.open(path, FILE_WRITE);
+    if(!file){
+        Serial.println("Failed to open file for writing");
+        return;
+    }
+
+    size_t i;
+    start = millis();
+    for(i=0; i<2048; i++){
+        file.write(buf, 512);
+    }
+    end = millis() - start;
+    Serial.printf("%u bytes written for %u ms\n", 2048 * 512, end);
+    file.close();
+}
+
+/* ============ IR Functions ============ */ 
+void sendButton(int command)
+{
+  Serial.println(command);
+  Serial.flush();
+  IrSender.sendSony(0xF, command, 2, 12);
+}
+
+/* ============ Setup ============ */ 
 void setup() {
   Serial.begin(115200);
-  pinMode(LED_PIN, OUTPUT);  // set the LED pin mode
 
+  pinMode(LED_PIN, OUTPUT);  // set the LED pin mode
+  
   delay(10);
 
+  /* ============ SD-Card Setup ============ */
+  if(!SD.begin()){
+        Serial.println("Card Mount Failed");
+        return;
+    }
+  uint8_t cardType = SD.cardType();
+
+  if(cardType == CARD_NONE){
+      Serial.println("No SD card attached");
+      return;
+  }
+
+  Serial.print("SD Card Type: ");
+  if(cardType == CARD_MMC){
+      Serial.println("MMC");
+  } else if(cardType == CARD_SD){
+      Serial.println("SDSC");
+  } else if(cardType == CARD_SDHC){
+      Serial.println("SDHC");
+  } else {
+      Serial.println("UNKNOWN");
+  }
+
+  uint64_t cardSize = SD.cardSize() / (1024 * 1024);
+  Serial.printf("SD Card Size: %lluMB\n", cardSize);
+
+  listDir(SD, "/", 0);
+  readFile(SD, "/index.html");
+  Serial.printf("Total space: %lluMB\n", SD.totalBytes() / (1024 * 1024));
+  Serial.printf("Used space: %lluMB\n", SD.usedBytes() / (1024 * 1024));
+
+
+  /* ============ IR Setup ============ */
+  IrSender.begin(IR_SEND_PIN, ENABLE_LED_FEEDBACK, USE_DEFAULT_FEEDBACK_LED_PIN);  // Specify send pin and enable feedback LED at default feedback LED pin
+  Serial.println();
+  Serial.print(F("Send IR signals at pin "));
+  Serial.println(IR_SEND_PIN);
+
+  /* ============ Webserver Setup ============ */ 
+
   // We start by connecting to a WiFi network
 
   Serial.println();
@@ -50,11 +202,6 @@ void setup() {
     Serial.print(".");
   }
 
-  IrSender.begin(IR_SEND_PIN, ENABLE_LED_FEEDBACK, USE_DEFAULT_FEEDBACK_LED_PIN);  // Specify send pin and enable feedback LED at default feedback LED pin
-  Serial.println();
-  Serial.print(F("Send IR signals at pin "));
-  Serial.println(IR_SEND_PIN);
-
   Serial.println();
   Serial.println("WiFi connected.");
   Serial.println("IP address: ");
@@ -63,8 +210,6 @@ void setup() {
   server.begin();
 }
 
-
-
 void loop() {
   WiFiClient client = server.available();  // listen for incoming clients
 
@@ -87,16 +232,8 @@ void loop() {
             client.println();
 
             // the content of the HTTP response follows the header:
-            client.print("Click <a href=\"/H\">here</a> to turn the LED on pin 13 on.<br>");
+            client.print("Click <a href=\"/H\">here</a> to turn the LED on pin 13 on.<br>Click <a href=\"/L\">here</a> to turn the LED on pin 13 off.<br><a href=\"/power\">power</a><br><a href=\"/play\">play</a><br><a href=\"/pause\">pause</a><br><a href=\"/stop\">stop</a><br><a href=\"/prev\">previous track</a><br><a href=\"/next\">next track</a><br>");
-            client.print("Click <a href=\"/L\">here</a> to turn the LED on pin 13 off.<br>");
+            client.print("<form action=\"/api/control-deck\" method=\"post\"><button name=\"control\" type=\"submit\" value=\"play\">play</button></form><br><form action=\"/api/control-deck\" method=\"get\"><input name=\"textinput\" type=\"text\" /><button type=\"submit\">send</button></form><br>");
-            client.print("<a href=\"/power\">power</a><br>");
-            client.print("<a href=\"/play\">play</a><br>");
-            client.print("<a href=\"/pause\">pause</a><br>");
-            client.print("<a href=\"/stop\">stop</a><br>");
-            client.print("<a href=\"/prev\">previous track</a><br>");
-            client.print("<a href=\"/next\">next track</a><br>");
-            client.print("<form action=\"/api/control-deck\" method=\"post\"><button name=\"control\" type=\"submit\" value=\"play\">play</button></form><br>");
-            client.print("<form action=\"/api/control-deck\" method=\"get\"><input name=\"textinput\" type=\"text\" /><button type=\"submit\">send</button></form><br>");
 
             // The HTTP response ends with another blank line:
             client.println();
@@ -148,9 +285,4 @@ void loop() {
   }
 }
 
-void sendButton(int command)
+
-{
-  Serial.println(command);
-  Serial.flush();
-  IrSender.sendSony(0xF, command, 2, 12);
-}