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Ultra sonic code

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L

Lilikin

New Member
Hi i am after some help with my code i have timed six ports to drive an ultra sonic transducer at 40K i just need a hand stopping timer0 and getting the data back here is my current code
Code: 
	LIST	p=16F877		;tell assembler what chip we are using
	include "P16F877.inc"		;include the defaults for the chip
	__config 0x3D18			;sets the configuration settings (oscillator type etc.)

	cblock 	0x20 			;start of general purpose registers
		count1 			;used in delay routine
		counta 			;used in delay routine 
		countb 			;used in delay routine
	endc

	cblock
	d1
	endc
	

	LEDPORT	Equ	PORTB		;set constant LEDPORT = 'PORTB'
	LEDTRIS	Equ	TRISB		;set constant for TRIS register
	
	org	0x0000			;org sets the origin, 0x0000 for the 16F628,
					;this is where the program starts running	
	movlw	0x07
Loop	
	call	One
	call	Two
	call	Three
	call	Four
	call	Five
	call	Six

	goto	Loop			;go back and do it again


One	movlw	b'10000000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'10000000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'10000000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'10000000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'10000000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'10000000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!		
	Return	


	
Two	movlw	b'01000000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'01000000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'01000000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'01000000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'01000000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'01000000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!	
	
	Return
	
Three	movlw	b'00100000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00100000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00100000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00100000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00100000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00100000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!	
	Return




Four	movlw	b'00010000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00010000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00010000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00010000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00010000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00010000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!	

	return

Five	movlw	b'00001000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00001000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00001000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00001000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00001000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00001000'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!	
	return

Six	movlw	b'00000100'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00000100'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00000100'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00000100'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00000100'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!
	movlw	b'00000100'
	movwf	LEDPORT
	call	DelayMark		;this waits for the marktime!
	movlw	b'00000000'
	movwf	LEDPORT
	call	DelaySpace		;this waits for spacetime!	
	return
DelayMark
			;58 cycles
	movlw	0x13
	movwf	d1
DelayMark_0
	decfsz	d1, f
	goto	DelayMark_0

			;1 cycle
	nop

			;4 cycles (including call)
	return

; Delay = 62 instruction cycles
; Clock frequency = 20 MHz

; Actual delay = 1.24e-005 seconds = 62 cycles
; Error = 0 %

	cblock
	c1
	endc

DelaySpace
			;58 cycles
	movlw	0x13
	movwf	c1
DelaySpace_0
	decfsz	c1, f
	goto	DelaySpace_0

			;4 cycles (including call)
	return

end

could some one help me take the next step i cant use the interrupt to stop the 877 im using the int pin for something else and it is already connected on hardware so i need to check for a return but really quick 

also how do i do multiplication as i need to times the result by 340 m/s  to give me the distance between the senser and the target

then divide by two but i can over come this


thanks
 
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