hal_audio implementation for f4discovery port

2025-03-14 01:27:41 +00:00 · 2018-07-20 16:30:43 +02:00 · 2018-07-20 16:30:43 +02:00 · 730bc5a03e
commit 730bc5a03e
parent 95c90b0854
1 changed files with 121 additions and 0 deletions
--- a/port/stm32-f4discovery-cc256x/src/hal_audio_f4discovery.c
+++ b/port/stm32-f4discovery-cc256x/src/hal_audio_f4discovery.c
@ -0,0 +1,121 @@
+/*
+ * 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
+ *
+ */
+
+#include "hal_audio.h"
+#include "stm32f4_discovery_audio.h"
+
+#define OUTPUT_BUFFER_NUM_SAMPLES       512
+#define NUM_OUTPUT_BUFFERS              2
+
+static void (*audio_played_handler)(uint8_t buffer_index);
+static int started;
+
+// our storage
+static int16_t output_buffer[NUM_OUTPUT_BUFFERS * OUTPUT_BUFFER_NUM_SAMPLES * 2];   // stereo
+
+void  BSP_AUDIO_OUT_HalfTransfer_CallBack(void){
+	(*audio_played_handler)(0);
+}
+
+void BSP_AUDIO_OUT_TransferComplete_CallBack(void){
+	(*audio_played_handler)(1);
+}
+
+/**
+ * @brief Setup audio codec for specified samplerate and number channels
+ * @param Channels
+ * @param Sample rate
+ * @param Buffer played callback
+ * @param Buffer recorded callback (use NULL if no recording)
+ */
+void hal_audio_init(uint8_t channels, 
+                    uint32_t sample_rate,
+                    void (*buffer_played_callback)  (uint8_t buffer_index),
+                    void (*buffer_recorded_callback)(const int16_t * buffer, uint16_t num_samples)){
+
+	audio_played_handler = buffer_played_callback;
+	UNUSED(buffer_recorded_callback);
+	BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_BOTH, 80, sample_rate);
+}
+
+/**
+ * @brief Get number of output buffers in HAL
+ * @returns num buffers
+ */
+uint16_t hal_audio_get_num_output_buffers(void){
+	return NUM_OUTPUT_BUFFERS;
+}
+
+/**
+ * @brief Get size of single output buffer in HAL
+ * @returns buffer size
+ */
+uint16_t hal_audio_get_num_output_buffer_samples(void){
+	return OUTPUT_BUFFER_NUM_SAMPLES;
+}
+
+/**
+ * @brief Reserve output buffer
+ * @returns buffer
+ */
+int16_t * hal_audio_get_output_buffer(uint8_t buffer_index){
+	switch (buffer_index){
+		case 0:
+			return output_buffer;
+		case 1:
+			return &output_buffer[OUTPUT_BUFFER_NUM_SAMPLES * 2];
+		default:
+			return NULL;
+	}
+}
+
+/**
+ * @brief Start stream
+ */
+void hal_audio_start(void){
+	started = 1;
+	// BSP_AUDIO_OUT_Play gets number bytes -> 1 frame - 16 bit/stereo = 4 bytes
+	BSP_AUDIO_OUT_Play( (uint16_t*) output_buffer, NUM_OUTPUT_BUFFERS * OUTPUT_BUFFER_NUM_SAMPLES * 4);
+}
+
+/**
+ * @brief Close audio codec
+ */
+void hal_audio_close(void){
+	started = 0;
+	BSP_AUDIO_OUT_Stop(CODEC_PDWN_HW);
+}