Hello, Can someone explain what it means??
#define IOPIN0 (*(volatile unsigned long *)(GPIO_BASE_ADDR + 0x00))
The controller using is LPC23xx/24xx.
BR Chethan
(making allowances for English as a foreign language)
Well, one common use of the 'volatile' qualifier is to indicate that memory content may bechanged by "another file".
So think how a hardware SFR (special function register) might have similar issues...
Is this essentially the same question as http://www.keil.com/forum/58484 ?