Microcontroller Help: how to program codewarrior ide?

Replies

• 

  Kaustubh Katdare

  Thread moved to here.
  
  Feel free to ask questions and provide as many details you can along with your questions. Be assured that you'll be helped by CEans.
• 

  tyr

  thread moved to where??? superblog?
• 

  debu

  @tyr: Welcome to CE! 😁
  
  What do you want to know? Shoot away...
  
  Regards,
  
  Debu 😀
• 

  tyr

  using code warrior....
  
  ldy #6000
  loop:
  dey
  bne loop
  
  
  try embedding this in an outer loop to successively turn an led at port b on and off with a one second period. then embed the wole thing in a continuous loop to run forever.
  
  second
  
  
  use the led flasher code from the other exercise to build a pulse width modulator. the modulator should read a byte from port h and output a pulse to port b with a period of 256 ms and a duty cycle equal to the value of the byte at port h divided by 256
  
  
  thanks
• 

  debu

  @tyr:
  
  This looks like a homework assignment. Anyway, here:
  

  ;Blink LED on 0th bit of PORTB    
      ORG 0xF000        ;Beginning of code stack
          Start:
              LDS    #0x0C00        ;Load 0x0C00 to the top of the stack
              CLR    COPCTL        ;Disable COP by making the COPCTL register 0
              BSET PORTB, 0     ;Set bit 0 of PORTBB
              ;Outer loop
              outer:
              ; Your code starts here:
                  ldy #6000    ;Load Y with 6000
                  loop:
                      dey        ;Decrement Y
                  bne loop    ;If y!=0 branch to loop
                  ;After wasting 6000 cycles (roughly 1 sec in this case)
                  COM PORTB    ;Complement PORTB
              JMP outer        ;Jump to outer
      END
  

  Now, you should use my code above to make PWM on your own, its really simple.
  
  Regards,
  
  Debu 😀