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PORT ADDRESS!

Punit Ganshani

I am using AT89C52 and I need to program such that I can read the data on PORT Pins in a specific pattern as described below:

P(x,y)

where x should be port number and
y should be pin number of the port to give me PX_Y
ex. P(0,5) == P0_5

How can I do this? Can anyone help me in this? Please mail me the solution on punit.ganshani@gmail.com

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  • 0

    "ex. P(0,5) == P0_5"

    You can easily do that at compile-time with a #define macro - see any 'C' textbook.

    You can't do it directly at run-time, since 8051 ports are not indirectly addressable (none of the SFRs is).

    You'd have to do something like:

    bit read_port( U8 port_num, U8 bit_num )
{
   switch( port_num )
   {
      case 0: return P0 & (1<<bit_num); case 1: return p1 & (1<<bit_num); < i>etc...

Reply
  • 0

    "ex. P(0,5) == P0_5"

    You can easily do that at compile-time with a #define macro - see any 'C' textbook.

    You can't do it directly at run-time, since 8051 ports are not indirectly addressable (none of the SFRs is).

    You'd have to do something like:

    bit read_port( U8 port_num, U8 bit_num )
{
   switch( port_num )
   {
      case 0: return P0 & (1<<bit_num); case 1: return p1 & (1<<bit_num); < i>etc...

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