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(008) CubeIDE Implementation of USB Peripherals*
(018) C99 pointer*
(019) C99 With only value assignment*
(022) POSIX pthread multi-threads mutex*
(023) POSIX pthread multi-threads programming*
(027) C99 time and wait*
(028) High-precision calculation with GMP*
(029) Web Service Lib*
(030) International Components for Unicode (ICU)*
(031) Performance of C is higher than C++, because...*
(041) STM32 RS485 Differential signal communication
RS485差分信号通信 RS485的通信线有两根，根据两根线的电压差来确定传输的是0还是1。 RS485S双绞线可以传输比RS232更远的距离，可达1200米，而且传输的频率可达50M。 RS232的传输距离为15米，传输频率为2M。