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How to set, reset IO in ARM architecture?

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emanuelcsm

emanuelcsm

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Hi, I'm new in ARM Archterure, I'm using the LPC2129.

To set the IO 7 I use IOSET |= 0x00000080; and to reset him I use IOCLEAR |= 0x00000080; Rigth?

But I don't need only set and reset, I'm using the IO's 7 8 9 us a binarry counter, If my IO state is only a register I use 'IOVALUE += 0x00000080' to increment and 'IOVALUE -= 0x00000080' to decrement.

How can I do it in ARM Archteture?
 

Re: New in ARM

Though the IOPIN register is mentioned as READ ONLY, it is rumored, that one can write to it, but it seems to be very inefficient. It is interesting to compare the execution time for:

IO0PIN += 0x00000080;

with

unsigned int PORT0bits;
...
PORT0bits += 0x00000080;
PORT0bits &= 0x00000380;
IO0CLR = 0x00000380;
IO0SET = PORT0bits;

Varuzhan
 

    emanuelcsm

    emanuelcsm

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