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LPC23xx gpio code

Chethan

Hello,
Can someone explain what it means??

#define IOPIN0 (*(volatile unsigned long *)(GPIO_BASE_ADDR + 0x00))

The controller using is LPC23xx/24xx.

BR Chethan

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  • 0 in reply to Chethan

    No. You really should read up about volatile.

    You seem to think about external declarations, which is something completely different.

    Didn't you consider the hints I left about the need for volatile because of the difference between a normal RAM variable and a special function register? Volatile is even part of non-technical English. Nitroglycerin is volatile, as is the situation in Ukraine.

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  • 0 in reply to Chethan

    No. You really should read up about volatile.

    You seem to think about external declarations, which is something completely different.

    Didn't you consider the hints I left about the need for volatile because of the difference between a normal RAM variable and a special function register? Volatile is even part of non-technical English. Nitroglycerin is volatile, as is the situation in Ukraine.

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