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spi_flash存储死机日志问题 #12

@lisongze2016

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@lisongze2016

使用cmb_flash_log_println或者ulog输出到外部spi flash中场景:

hardfault中断中,最终会调用spi 操作, 会存在使用mutex锁情况。

中断中不能使用mutex锁, 是否存在此问题,导致输出异常?

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