EMERSON VE3008 CE3008 KJ2005X1-MQ1 12P6381X042

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EMERSON VE3008 CE3008 KJ2005X1-MQ1 12P6381X042

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VE3008 CE3008 KJ2005X1-MQ1 12P6381X042 Hardware registers for parallel devices (such as status registers): Memory mapped hardware registers usually also need to be voliate, as each read and write to it may have different meanings.

·Variables modified in interrupt service programs for detection by other programs need to be volatile: when a variable is modified in triggering an interrupt program, but the compiler determines that the variable has not been modified in the main function, it may only perform one read operation from memory to a certain register, and then only read a copy of the variable from that register each time, causing the interrupt program’s operation to be short circuited.

·VE3008 CE3008 KJ2005X1-MQ1 12P6381X042 In a multitasking environment, the shared flag between tasks should be marked with volatile: In this thread, when reading a variable, the compiler may sometimes first read the variable into a register during optimization; In the future, when taking variable values, they will be directly retrieved from the register; When a memory variable or register variable changes its value due to other threads, the value of the register will not change accordingly, causing the value read by the application program to be inconsistent with the actual variable value.

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