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I have currently developed an ARM7 development board. I can succesfully load the program but the IO pins do not invert as per the program. What can be the posible issues? I am new to this. Thankyou.
You're new to what, asking questions with enough context for other to fathom what you're doing? Problem solving and debugging? ARM, C ?
What can be the possible issues?
That you have failed to code the solution correctly, perhaps by not enabling the right clocks, or neglecting some critical step.
Given the stellar amount of effort you put into describing the problem, the board/chip used, and the code in question, it's very hard to give you any specific answer.
Which ARM7 controller are you using? What is the code that you have written? What steps have you taken to check the pin toggling? Did you check the code in simulation mode?