41 lines
2.2 KiB
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41 lines
2.2 KiB
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=========================
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ON Semiconductor LC823450
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=========================
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(Dual core ARM Cortex-M3). In NuttX-7.22,
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Masayuki Ishikawa contributed support for both the LC823450 architecture
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and for ON Semiconductor's **LC823450XGEVK board**:
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The LC823450XGEVK is an audio processing system Evaluation Board Kit
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used to demonstrate the LC823450. This part can record and playback,
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and offers High-Resolution 32-bit & 192 kHz audio processing
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capability. It is possible to cover most of the functions necessary
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for a portable audio with only this LSI as follows. It has Dual CPU
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and DSP with High processing capability, and internal 1656K-Byte
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SRAM, which make it possible to implement large scale program. And it
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has integrated analog functions (low-power Class D HP amplifier, PLL,
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ADC etc.) so that PCB space and cost is reduced, and it has various
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interface (USB, SD, SPI, UART, etc.) to make extensibility high. Also
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it is provided with various function including SBC/AAC codec by DSP
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and UART and ASRC (Asynchronous Sample Rate Converter) for Bluetooth®
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audio. It is very small chip size in spite of the multi-funciton as
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described above and it realizes the low power consumption. Therefore,
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it is applicable to portable audio markets such as Wireless headsets
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and will show high performance.
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Further information about the LC823450XGEVK is available on from the the
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`ON
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Semiconductor <http://www.onsemi.com/PowerSolutions/evalBoard.do?id=LC823450XGEVK>`__
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website as are LC823450 `related technical
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documents <http://www.onsemi.com/PowerSolutions/supportDoc.do?type=AppNotes&rpn=LC823450>`__.
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Refer to the NuttX board
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`README <https://github.com/apache/nuttx/blob/master/boards/arm/lc823450/lc823450-xgevk/README.txt>`__
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file for details of the NuttX port.
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This port is intended to test LC823450 features including SMP. Supported
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peripherals include UART, TIMER, RTC, GPIO, DMA, I2C, SPI, LCD, eMMC,
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and USB device. ADC, Watchdog, IPC2, and I2S support was added by
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Masayuki Ishikawa in NuttX-7.23. Bluetooth, SPI, and *PROTECTED* build
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support were added by Masayuki Ishikawa in NuttX-7.26. Support for for
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SPI flash boot was added in NuttX-7.28.
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