Having fun with Karaoke

Diff: main.cpp

Revision:

0:ccce492abbb4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed May 03 10:01:24 2017 +0000
@@ -0,0 +1,164 @@
+/**
+ ******************************************************************************
+ * @file    main.cpp
+ * @author  Davide Aliprandi, STMicroelectronics
+ * @version V1.0.0
+ * @date    November 25th, 2016
+ * @brief   mbed test application which combines the STMicroelectronics
+ *          X-NUCLEO-CCA01M1 and the X-NUCLEO-CCA02M1 Expansion Boards.
+ ******************************************************************************
+ * @attention
+ *
+ * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *   1. Redistributions of source code must retain the above copyright notice,
+ *      this list of conditions and the following disclaimer.
+ *   2. Redistributions in binary form must reproduce the above copyright notice,
+ *      this list of conditions and the following disclaimer in the documentation
+ *      and/or other materials provided with the distribution.
+ *   3. Neither the name of STMicroelectronics nor the names of its contributors
+ *      may be used to endorse or promote products derived from this software
+ *      without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ ******************************************************************************
+ */
+
+
+/* Includes ------------------------------------------------------------------*/
+
+/* mbed specific header files. */
+#include "mbed.h"
+#include "rtos.h"
+
+
+#if DEVICE_I2S
+
+/* Helper header files. */
+#include "DevI2C.h"
+
+/* Component specific header files. */
+#include "STA350BW.h"
+
+/* Expansion Board specific header files. */
+#include "XNucleoCCA02M1.h"
+
+
+/* Variables -----------------------------------------------------------------*/
+
+/* Initialization parameters. */
+STA350BW_init_t sound_terminal_init =
+{
+    32000,   /* Default Sampling Frequency [Hz]. */
+    100      /* Default Volume. */
+};
+XNucleoCCA02M1_init_t microphones_init =
+{
+    32000,   /* Default Sampling Frequency [Hz]. */
+    2        /* Default number of channels. */
+};
+
+/* Sound Terminal Component. */
+STA350BW *sound_terminal;
+
+/* MEMS Microphones Expansion Board. */
+XNucleoCCA02M1 *microphones;
+
+/* Thread to manage I2S peripherals. */
+static rtos::Thread i2s_bh_daemon;
+
+
+/* Functions -----------------------------------------------------------------*/
+
+/**
+ * @brief  Callback to start playing from the sound terminal the PCM buffer
+ *         filled by the microphones.
+ * @param  PCM_buffer       Buffer containing the PCM data to play.
+ * @param  PCM_buffer_bytes Size of the buffer.
+ * @retval None.
+ */
+void StartPlaying(int16_t *PCM_buffer, uint16_t PCM_buffer_bytes)
+{
+    static bool first_time = true;
+    if (first_time)
+    {
+        /* Start playing from the sound terminal. */
+        sound_terminal->play(PCM_buffer, PCM_buffer_bytes, true);
+        first_time = false;
+    }
+}
+
+/**
+ * @brief  Entry point function of mbedOS.
+ * @param  None
+ * @retval None
+ */
+int main(void)
+{
+    /*----- Initialization. -----*/
+
+    /* Initializing I2C bus. */
+    DevI2C *dev_i2c = new DevI2C(PB_9, PB_8);
+
+    /* Initializing Sound Terminal Component on the I2S2 interface. */
+    sound_terminal = new STA350BW(PA_10, STA350BW_ADDRESS_2, *dev_i2c, PC_12, PC_10, PA_4, NC, PC_7);
+    if (sound_terminal->init(&sound_terminal_init) != COMPONENT_OK)
+    {
+        error("Initialization of the Sound Terminal Expansion Board failed.\r\n");
+        exit(EXIT_FAILURE);
+    }
+
+    /* Initializing MEMS Microphones Expansion Board on the I2S1 interface. */
+    microphones = new XNucleoCCA02M1(PB_15, PB_13);
+    if (microphones->init(&microphones_init) != COMPONENT_OK)
+    {
+        error("Initialization of the MEMS Microphones Expansion Board failed.\r\n");
+        exit(EXIT_FAILURE);
+    }
+
+    /* Asking the I2S peripherals to work at frequencies one multiple of the
+       other in order to avoid audio glitches that may be caused by a drift
+       between the I2S clock signals.*/
+    int ret = I2S::harmonize(sound_terminal->dev_i2s, microphones->dev_i2s);
+    if (ret != 0)
+        error("Unable to synchronize audio frequencies.\r\n");
+
+    /* Starting a thread to manage I2S peripherals. */
+    Callback<void()> i2s_bh_task(&I2S::i2s_bh_queue, &events::EventQueue::dispatch_forever);
+    i2s_bh_daemon.start(i2s_bh_task);
+
+    /* Printing to the console. */
+    printf("Audio Karaoke Application Example\r\n\n");
+
+
+    /*----- Recording and playing. -----*/
+
+    /* Printing to the console. */
+    printf("--> Sing a song and have fun!\r\n");
+
+    /* Attaching a callback which will be called each time the microphones have
+       recorded 1 ms of audio data, and start recording. */
+    microphones->attach(&StartPlaying);
+    microphones->record();
+}
+
+#else // DEVICE_I2S
+
+int main(void)
+{
+    printf("The target does not support I2S API.\r\n");
+}
+
+#endif // DEVICE_I2S