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https://github.com/apache/nuttx-apps.git
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61e82925dc
This commit implements the loopback mode for the i2schar example application. This mode - available only when both RX and TX are enabled - allows the user to test the I2S buses when the TX pin is connected to the RX pin. This is done by pre-filling a buffer with known data (additionally, it checks the peripheral's data width to format the data in the buffer accordingly) and passing it for both the transmitter and the receiver threads. This buffer is written to the TX and the received buffer is compared to the known buffer. Signed-off-by: Tiago Medicci <tiago.medicci@espressif.com>
145 lines
4.7 KiB
C
145 lines
4.7 KiB
C
/****************************************************************************
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* apps/examples/i2schar/i2schar.h
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*
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* SPDX-License-Identifier: Apache-2.0
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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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#ifndef __APPS_EXAMPLES_I2SCHAR_I2SCHAR_H
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#define __APPS_EXAMPLES_I2SCHAR_I2SCHAR_H
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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 <pthread.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* CONFIG_EXAMPLES_I2SCHAR_DEVPATH - The default path to the I2S character
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* device. Default: /dev/i2schar0
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*/
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#ifndef CONFIG_AUDIO_I2SCHAR
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# error "I2S character device support is not enabled (CONFIG_AUDIO_I2SCHAR)"
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#endif
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#ifndef CONFIG_EXAMPLES_I2SCHAR_DEVPATH
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# define CONFIG_EXAMPLES_I2SCHAR_DEVPATH "/dev/is2char0"
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#endif
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#ifdef CONFIG_EXAMPLES_I2SCHAR_TX
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# ifndef CONFIG_EXAMPLES_I2SCHAR_TXBUFFERS
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# define CONFIG_EXAMPLES_I2SCHAR_TXBUFFERS 4
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# endif
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# ifndef CONFIG_EXAMPLES_I2SCHAR_TXSTACKSIZE
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# define CONFIG_EXAMPLES_I2SCHAR_TXSTACKSIZE 1536
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# endif
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#else
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# undef CONFIG_EXAMPLES_I2SCHAR_TXBUFFERS
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# define CONFIG_EXAMPLES_I2SCHAR_TXBUFFERS 0
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#endif
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#ifdef CONFIG_EXAMPLES_I2SCHAR_RX
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# ifndef CONFIG_EXAMPLES_I2SCHAR_RXBUFFERS
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# define CONFIG_EXAMPLES_I2SCHAR_RXBUFFERS 4
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# endif
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# ifndef CONFIG_EXAMPLES_I2SCHAR_RXSTACKSIZE
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# define CONFIG_EXAMPLES_I2SCHAR_RXSTACKSIZE 1536
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# endif
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#else
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# undef CONFIG_EXAMPLES_I2SCHAR_RXBUFFERS
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# define CONFIG_EXAMPLES_I2SCHAR_RXBUFFERS 0
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#endif
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#ifndef CONFIG_EXAMPLES_I2SCHAR_BUFSIZE
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# define CONFIG_EXAMPLES_I2SCHAR_BUFSIZE 256
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct i2schar_state_s
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{
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bool initialized;
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bool loopback;
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FAR char *devpath;
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#ifdef CONFIG_EXAMPLES_I2SCHAR_TX
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int txcount;
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#endif
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#ifdef CONFIG_EXAMPLES_I2SCHAR_RX
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int rxcount;
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#endif
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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extern struct i2schar_state_s g_i2schar;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: i2schar_devinit()
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*
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* Description:
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* Perform architecture-specific initialization of the I2s hardware and
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* registration of the I2S character driver CHAR hardware. If
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* CONFIG_EXAMPLES_I2SCHAR_DEVINIT is defined, then board-specific logic
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* must provide this function.
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*
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****************************************************************************/
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#ifdef CONFIG_EXAMPLES_I2SCHAR_DEVINIT
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int i2schar_devinit(void);
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#endif
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/****************************************************************************
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* Name: i2schar_transmitter()
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*
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* Description:
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* This is the entry point for the transmitter thread.
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*
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****************************************************************************/
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#ifdef CONFIG_EXAMPLES_I2SCHAR_TX
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pthread_addr_t i2schar_transmitter(pthread_addr_t arg);
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#endif
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/****************************************************************************
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* Name: i2schar_receiver()
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*
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* Description:
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* This is the entry point for the receiver thread.
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*
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****************************************************************************/
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#ifdef CONFIG_EXAMPLES_I2SCHAR_RX
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pthread_addr_t i2schar_receiver(pthread_addr_t arg);
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#endif
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#endif /* __APPS_EXAMPLES_I2SCHAR_I2SCHAR_H */
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