更新readme.md
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|USING_SOFT_SPI|使用 soft-spi 功能|
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|U_SOFT_SPI_BUS_CS_VALID|spi-cs 引脚仅在使用时有效|
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|U_SOFT_SPI_DEBUG|使用 spi-debug 检测参数功能|
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可选配置
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|配置|描述|
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|mr_hw_interrupt_disable()|rtos 临界段关闭中断|
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