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LED problems

phil Jones

Hi i am using the nordic nrf24e1 with combined 8051. I am very new to embedded and am just trying to blink an LED. For some reason it only works on pin 0 of port 0?? and on no other pin from ports 1 and 0. any ideas as to why this could be? i am using the correct header file (reg24e1.h) and it works on every pin in simulation, someone mentioned setting tri-states or as an output?? but i do not know how to do this. Any help will be greatly appreciated.

leigh

Parents
  • 0 in reply to Drew Davis

    "From glancing at the datasheet, it seems as though the I/O ports on this variant are a bit non-standard."

    Now there's an understatement!
    From the snippet provided, it sounds like the I/O ports on this variant are completely unlike a standard 8051!

    "The clue there will lie in the difference between the simulated hardware and the real board."

    So, what does the simulator actually do?

    http://www.keil.com/dd/chip/3605.htm says,

    "Simulation for this device is provided by the default peripheral simulation driver."

    In other words, the simulator simulates as if these were standard 8051 ports - they aren't, so the reults are meaningless.

Reply
  • 0 in reply to Drew Davis

    "From glancing at the datasheet, it seems as though the I/O ports on this variant are a bit non-standard."

    Now there's an understatement!
    From the snippet provided, it sounds like the I/O ports on this variant are completely unlike a standard 8051!

    "The clue there will lie in the difference between the simulated hardware and the real board."

    So, what does the simulator actually do?

    http://www.keil.com/dd/chip/3605.htm says,

    "Simulation for this device is provided by the default peripheral simulation driver."

    In other words, the simulator simulates as if these were standard 8051 ports - they aren't, so the reults are meaningless.

Children
  • 0 in reply to Andy Neil

    Thanks a bunch guys, i sm only using one LED and was hovering around the face that i would need to set the pins corretly and that it was just luck that P0^0 was already configured correctly, I never actually noticed the _DIR AND _ALT before, that seems almost certainly the problem. I will try that out and let you know if i have more problems........next step wireless connection (I hope you have your thinking caps on)

    thanks again

  • 0 in reply to phil Jones

    Well if you are interested it turns out that in fact i needed to use the _DIR = 0 statement to assign the port as outputs.