2023-10-23 19:21:37 +02:00
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================================
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2023-10-21 12:24:43 +02:00
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``i2cchar`` Transfer Through I2C
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================================
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A mindlessly simple test of an I2C driver. It reads an write garbage data to the
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I2C transmitter and/or received as fast possible.
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This test depends on these specific I2S/AUDIO/NSH configurations settings (your
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specific I2S settings might require additional settings).
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- ``CONFIG_I2S`` – Enabled I2S support.
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- ``CONFIG_AUDIO`` – Enabled audio support.
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- ``CONFIG_DRIVERS_AUDIO`` – Enable audio device support.
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- ``CONFIG_AUDIO_I2SCHAR`` – Enabled support for the I2S character device.
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- ``CONFIG_NSH_BUILTIN_APPS`` – Build the I2S test as an NSH built-in function.
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Default: Built as a standalone program.
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Specific configuration options for this example include:
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- ``CONFIG_EXAMPLES_I2SCHAR`` – Enables the I2C test.
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- ``CONFIG_EXAMPLES_I2SCHAR_DEVPATH`` – The default path to the ADC device.
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Default: ``/dev/i2schar0``.
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- ``CONFIG_EXAMPLES_I2SCHAR_TX`` – This should be set if the I2S device supports a
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transmitter.
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- ``CONFIG_EXAMPLES_I2SCHAR_TXBUFFERS`` – This is the default number of audio
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buffers to send before the TX transfers terminate. When both TX and RX
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transfers terminate, the task exits (and, if an NSH builtin, the ``i2schar``
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command returns). This number can be changed from the NSH command line.
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- ``CONFIG_EXAMPLES_I2SCHAR_TXSTACKSIZE`` – This is the stack size to use when
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starting the transmitter thread. Default ``1536``.
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- ``CONFIG_EXAMPLES_I2SCHAR_RX`` – This should be set if the I2S device supports a
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transmitter.
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- ``CONFIG_EXAMPLES_I2SCHAR_RXBUFFERS`` – This is the default number of audio
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buffers to receive before the RX transfers terminate. When both TX and RX
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transfers terminate, the task exits (and, if an NSH builtin, the ``i2schar``
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command returns). This number can be changed from the NSH command line.
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- ``CONFIG_EXAMPLES_I2SCHAR_RXSTACKSIZE`` – This is the stack size to use when
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starting the receiver thread. Default ``1536``.
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- ``CONFIG_EXAMPLES_I2SCHAR_BUFSIZE`` – The size of the data payload in one audio
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buffer. Applies to both TX and RX audio buffers.
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- ``CONFIG_EXAMPLES_I2SCHAR_DEVINIT`` – Define if architecture-specific I2S device
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initialize is available. If defined, the platform specific code must provide a
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function ``i2schar_devinit()`` that will be called each time that this test
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executes. Not available in the kernel build mode.
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