freertos tasks

src/main.cpp

@@ -24,8 +24,42 @@ SDCard sdcard;
 Sound sound;
 Ringbuf ringbuf = Ringbuf((size_t) BUF_LENGTH);
 
-void sd_read_task(void *pvParameter) {
-  sdcard.open("/T1.wav");
+TaskHandle_t xTaskRead = NULL;
+TaskHandle_t xTaskWrite = NULL;
+bool playing = false;
+
+static const char *soundFile[3][3] = {{"/T0.wav", "/T1.wav", "/T2.wav"},
+                                      {"/T3.wav", "/T4.wav", "/T5.wav"},
+                                      {"/T6.wav", "/T7.wav", "/T8.wav"}};
+
+void i2s_write_task(void *pvParameter) {
+  sound.play();
+  for ( ;; ) {
+    //TickType_t delay = 10 / portTICK_PERIOD_MS; // max delay: 10ms instead of portMAX_DELAY
+    uint16_t *start_ptr = ringbuf.getRead();
+    size_t size_avail = ringbuf.getReadAvail();
+    int num_samples = 0;
+    for (int i=0; i<size_avail; i++) {
+      unsigned int sample = ((unsigned short) start_ptr[i] << 16 & 0xffff0000) | ((unsigned short) start_ptr[i]);
+      int num_pushed_bytes = i2s_push_sample(sound.i2s_num, (char *)&sample, 0);
+      num_samples += num_pushed_bytes/4;
+    }
+    ringbuf.setRead(num_samples);
+//    Serial.print(num_samples,DEC);
+//    Serial.println(" pushed samples to i2s");
+    if (!ringbuf.active && ringbuf.getReadAvail() == 0) break;		// End
+    vTaskDelay(20 / portTICK_PERIOD_MS);
+  }
+  sound.stop();
+  vTaskDelete( NULL );
+}
+
+void sd_read_task(void *pvParameters) {
+  char *path = (char *) pvParameters;
+  Serial.println("sdcard: opening File");
+  sdcard.open(path);
+  ringbuf.active = true;
+  xTaskCreate(&i2s_write_task, "write_task", 1024, NULL, 5, &xTaskWrite);
   for ( ;; ) {
     uint16_t *start_ptr = ringbuf.getWrite();
     size_t size_avail = ringbuf.getWriteAvail();
@@ -40,29 +74,13 @@ void sd_read_task(void *pvParameter) {
     if (!sdcard.available()) break;		// EOF
     vTaskDelay(20 / portTICK_PERIOD_MS);	// 20ms
   }
+  ringbuf.active = false;
   Serial.println("sdcard: EOF");
   sdcard.close();
   vTaskDelete( NULL );
 }
 
-void i2s_write_task(void *pvParameter) {
-  for ( ;; ) {
-    //TickType_t delay = 10 / portTICK_PERIOD_MS; // max delay: 10ms instead of portMAX_DELAY
-    uint16_t *start_ptr = ringbuf.getRead();
-    size_t size_avail = ringbuf.getReadAvail();
-    int num_samples = 0;
-    for (int i=0; i<size_avail; i++) {
-      unsigned int sample = ((unsigned short) start_ptr[i] << 16 & 0xffff0000) | ((unsigned short) start_ptr[i]);
-      int num_pushed_bytes = i2s_push_sample(sound.i2s_num, (char *)&sample, 0);
-      num_samples += num_pushed_bytes/4;
-    }
-    ringbuf.setRead(num_samples);
-    Serial.print(num_samples,DEC);
-    Serial.println(" pushed samples to i2s");
-    vTaskDelay(20 / portTICK_PERIOD_MS);
-  }
-  vTaskDelete( NULL );
-}
+
 
 void setup()
 {
@@ -79,10 +97,9 @@ void setup()
   sdcard.mount();
   sound.init();
 
-  xTaskCreate(&sd_read_task, "read_task", 2048, NULL, 5, NULL);
-  xTaskCreate(&i2s_write_task, "write_task", 1024,NULL,5,NULL );
+  static const char *bootSound = "/T1.wav";
 
-  delay(1000);
+  xTaskCreate(&sd_read_task, "read_task", 2048, (void*)bootSound, 5, &xTaskRead);
 }
 
 void loop()
@@ -91,17 +108,20 @@ void loop()
   for(int i=0; i<=9; i++) {
     if (keyboard.getTouchDetected(i) == true) {
       touched = true;
+        Serial.println("touch");
+      if (sound.playing == false) {
+        Serial.println("new task");
+        xTaskCreate(&sd_read_task, "read_task", 2048, (void*)soundFile[i/3][i%3], 5, &xTaskRead);
+      }
     }
   }
 
     if (touched == true) {
       // turn the LED on (HIGH is the voltage level)
       digitalWrite(LED_PIN, HIGH);
-      sound.play();
     } else {
       // turn the LED off by making the voltage LOW
       digitalWrite(LED_PIN, LOW);
-//      sound.stop();
     }
 
 

src/ringbuf.cpp

@@ -12,6 +12,7 @@ Ringbuf::Ringbuf(size_t buf_length) {
   this->read_pos = 0;
   this->write_pos = 0;
   this->full = false;
+  this->active = false;
 }
 
 Ringbuf::~Ringbuf() {

src/ringbuf.h

@@ -17,6 +17,7 @@ class Ringbuf {
     void setWrite(size_t bytes);
     void setRead(size_t bytes);
     bool full;
+    bool active = false;
   private:
 };
 

src/sound.cpp

@@ -76,10 +76,12 @@ void Sound::init() {
 
 void Sound::play() {
   i2s_start(i2s_num);
+  playing = true;
 }
 
 void Sound::stop() {
   i2s_stop(i2s_num);
+  playing = false;
 }
 
 void Sound::end() {

src/sound.h

@@ -27,6 +27,7 @@ class Sound {
     void stop();
     int render_sample_block(uint16_t *sample_buf_left, uint16_t *sample_buf_right, int num_samples);
     const i2s_port_t i2s_num = (i2s_port_t)I2S_NUM;
+    bool playing;
   private:
     i2sbuffer_t buffer;