221 lines
6.9 KiB
C
221 lines
6.9 KiB
C
/****************************************************************************
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* boards/xtensa/esp32/common/src/esp32_es8388.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <debug.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/irq.h>
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#include <nuttx/audio/i2s.h>
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#include <nuttx/audio/pcm.h>
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#include <nuttx/audio/es8388.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/kmalloc.h>
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#include <arch/board/board.h>
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#include "esp32_board_i2c.h"
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#include "esp32_i2c.h"
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#include "esp32_i2s.h"
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#if defined(CONFIG_ESP32_I2S) && defined(CONFIG_AUDIO_ES8388)
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static struct es8388_lower_s g_es8388_lower[2];
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: esp32_es8388_initialize
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*
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* Description:
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* This function is called by platform-specific, setup logic to configure
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* and register the ES8388 device. This function will register the driver
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* as /dev/audio/pcm[x] where x is determined by the I2S port number.
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*
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* Input Parameters:
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* i2c_port - The I2C port used for the device
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* i2c_addr - The I2C address used by the device
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* i2c_freq - The I2C frequency used for the device
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* i2s_port - The I2S port used for the device
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*
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* Returned Value:
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* Zero is returned on success. Otherwise, a negated errno value is
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* returned to indicate the nature of the failure.
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*
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****************************************************************************/
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int esp32_es8388_initialize(int i2c_port, uint8_t i2c_addr, int i2c_freq,
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int i2s_port)
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{
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struct audio_lowerhalf_s *es8388;
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struct audio_lowerhalf_s *pcm;
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struct i2s_dev_s *i2s;
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struct i2c_master_s *i2c;
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static bool initialized = false;
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char devname[12];
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int ret;
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audinfo("i2s_port %d\ni2c_port %d, i2c_addr %d, i2c_freq %d\n",
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i2s_port, i2c_port, i2c_addr, i2c_freq);
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DEBUGASSERT(i2s_port >= 0 && i2s_port <= 1 && \
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i2c_port >= 0 && i2c_port <= 1);
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/* Have we already initialized? Since we never uninitialize we must
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* prevent multiple initializations. This is necessary, for example,
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* when the touchscreen example is used as a built-in application in
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* NSH and can be called numerous time. It will attempt to initialize
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* each time.
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*/
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if (!initialized)
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{
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/* Get an instance of the I2S interface for the ES8388 data channel */
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i2s = esp32_i2sbus_initialize(i2s_port);
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if (i2s == NULL)
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{
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auderr("ERROR: Failed to initialize I2S%d\n", i2s_port);
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ret = -ENODEV;
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goto errout;
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}
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i2c = esp32_i2cbus_initialize(i2c_port);
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if (i2c == NULL)
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{
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auderr("ERROR: Failed to initialize I2C%d\n", i2c_port);
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ret = -ENODEV;
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goto errout;
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}
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/* Check wheter to enable a simple character driver that supports I2S
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* transfers via a read() and write(). The intent of this driver is to
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* support I2S testing. It is not an audio driver but does conform to
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* some of the buffer management heuristics of an audio driver. It is
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* not suitable for use in any real driver application in its current
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* form. The i2schar driver will be initialized at /dev/i2schar0
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*/
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#ifdef CONFIG_AUDIO_I2SCHAR
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ret = i2schar_register(i2s, 0);
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if (ret < 0)
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{
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auderr("ERROR: i2schar_register failed: %d\n", ret);
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goto errout;
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}
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#endif
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/* Now we can use this I2S interface to initialize the ES8388 output
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* which will return an audio interface.
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*/
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g_es8388_lower[0].address = i2c_addr;
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g_es8388_lower[0].frequency = i2c_freq;
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es8388 = es8388_initialize(i2c, i2s, &g_es8388_lower[0]);
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if (es8388 == NULL)
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{
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auderr("ERROR: Failed to initialize the ES8388\n");
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ret = -ENODEV;
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goto errout;
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}
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/* Now we can embed the ES8388/I2S conglomerate into a PCM decoder
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* instance so that we will have a PCM front end for the the ES8388
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* driver.
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*/
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pcm = pcm_decode_initialize(es8388);
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if (pcm == NULL)
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{
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auderr("ERROR: Failed create the PCM decoder\n");
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ret = -ENODEV;
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goto errout;
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}
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/* Create a device name */
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snprintf(devname, sizeof(devname), "pcm%d", i2s_port);
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/* Finally, we can register the PCM/ES8388/I2S audio device. */
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ret = audio_register(devname, pcm);
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if (ret < 0)
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{
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auderr("ERROR: Failed to register /dev/%s device: %d\n",
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devname, ret);
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goto errout;
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}
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/* Now we can use this I2S interface to initialize the ES8388 input
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* which will return an audio interface.
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*/
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g_es8388_lower[1].address = i2c_addr;
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g_es8388_lower[1].frequency = i2c_freq;
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es8388 = es8388_initialize(i2c, i2s, &g_es8388_lower[1]);
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if (es8388 == NULL)
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{
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auderr("ERROR: Failed to initialize the ES8388\n");
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ret = -ENODEV;
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goto errout;
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}
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/* Create a device name */
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snprintf(devname, sizeof(devname), "pcm_in%d", i2s_port);
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/* Finally, we can register the PCM/ES8388/I2S audio device. */
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ret = audio_register(devname, es8388);
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if (ret < 0)
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{
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auderr("ERROR: Failed to register /dev/%s device: %d\n",
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devname, ret);
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goto errout;
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}
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/* Now we are initialized */
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initialized = true;
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}
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return OK;
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errout:
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return ret;
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}
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#endif /* CONFIG_ESP32_I2S && CONFIG_AUDIO_ES8388 */
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