Question

I am writing a program in c programming and it is supposed to do the following

using mc9s12dg256.h microcontroller

1. When both DIP switches #8 and #1 are high, turn on all LEDS.
2. When both DIP switches #8 and #1 are low, turn off all LEDs
3. When DIP switch #8 is high and #1 is low, turn on all the even numbered LEDs.
4. When DIP switch #1 is high and #8 is low, turn on all the odd numbered LEDs.
5. Your program must to read DIP switches and turn on/off corresponding LRDs continuously until a Reset.

I understand the code is supposed to look something like

void main(void)
{
  
InitSwitches();
InitLEDs();
if (DIP switches = %10000001) {
PORTB =  0;/Turn on all LEDs \   
}
}

However I don't know to to represent the "DIP switch" part in this code. Is it supposed to be a hexnumber or a built in feature?

Once I know that I know how to turn on all odd and even LEDs I just don;t know how to check which dip switch is on or off. I have read several journals and they got me really confused. I know how to do this in assembly language but in c I get really confused.

Answer 1

Answer :- The DIP switches must be connected to any one of the IO ports like PORTA, PORTB etc. Like we have LEDs on port B pins. In question it must be given that which port is connected with DIP switch. Then we can read that port pins to get the DIP switch status.

Please discuss with the question provider so that it will be cleared that which port pins are responsible for DIP switch.

Dear student, you can comment if you have any further doubt. OR you can solve assuming port A as DIP pins and later modify the port name if required. Thank you.