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Is it value or address?

Jani Jani

We use NXP LPC2468 Microcontroller in our target board.

We use Keil tools to build and debug our embedded C++ application.

#define UART1_BASE_ADDR         0xE0010000
#define U1RBR          (*(volatile unsigned long *)(UART1_BASE_ADDR + 0x00))

What is contents of U1RBR ?

Is it address 0xE0010000 ?

or

Is it the value stored at address 0xE0010000.

Thank you!

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  • 0 in reply to Papa Dorlingo

    "ANY SFR that is read should be declared volatile"

    I may have oversimplified just a tad, however none you mention are read

    For example, some SFRs can be used to specify the communication speed of a serial port. The underlying hardware does not change these values in the background and therefore they do not have to be declared volatile.

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  • 0 in reply to Papa Dorlingo

    "ANY SFR that is read should be declared volatile"

    I may have oversimplified just a tad, however none you mention are read

    For example, some SFRs can be used to specify the communication speed of a serial port. The underlying hardware does not change these values in the background and therefore they do not have to be declared volatile.

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