introduce hal_audio_dma for dma-driven audio playback

platform/embedded/hal_audio_dma.h

@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2017 BlueKitchen GmbH
+ *
+ * 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 the copyright holders nor the names of
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ * 4. Any redistribution, use, or modification is done solely for
+ *    personal benefit and not for any commercial purpose or for
+ *    monetary gain.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH 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 MATTHIAS
+ * RINGWALD 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.
+ *
+ * Please inquire about commercial licensing options at
+ * contact@bluekitchen-gmbh.com
+ *
+ */
+
+#ifndef __HAL_AUDIO_DMA_H
+#define __HAL_AUDIO_DMA_H
+
+#include <stdint.h>
+
+/*
+ *  hal_audio_dma.h
+ *
+ *  Hardware abstraction layer that provides block-wise audio playback
+ *
+ */
+
+/**
+ * @brief Setup audio codec for specified samplerate
+ * @param Sample rate
+ */
+void hal_audio_dma_init(uint32_t sample_rate);
+
+/**
+ * @brief Set callback to call when audio was sent
+ * @param handler
+ */
+
+void hal_audio_dma_set_audio_played(void (*handler)(void));
+
+/**
+ * @brief Play audio
+ * @param audio_data
+ * @param audio_len in bytes
+ */
+
+void hal_audio_dma_play(const uint8_t * audio_data, uint16_t audio_len);
+
+/**
+ * @brief Close audio codec
+ */
+void hal_audio_dma_close(void);
+
+#endif