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建议参考如下形式给出版本控制： #if defined(RT_VERSION_CHECK) && (RTTHREAD_VERSION >= RT_VERSION_CHECK(4, 1, 1))
#include <rtdevice.h>
#else
#include <touch.h>
#endif |
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rt_mq_recv 的返回值不是RT_EOK了. 而是接收到的长度.