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From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
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该现象产生的原因是OLED和microSD读卡器连接到了同一个通信总线上(相同的SPI线)。对于文件的读写,有自动占用和释放总线的方法,但是对于显示的写,只有自动占用总线的方法。在执行了显示写后,需要手动释放总线。
在下面的VI中给出了一个变通的方法。注意到没有同时输出显示和与文件交互的通路。C代码函数spi_init()被用于在显示写后手动的释放SPI总线。
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