Frequency Counter

[Asmith]

Bruce:
Thank you I did forget to set up those two registers. I will fix that.

Joe:
I'm using a function generator on the input with a scope on it as well and there is no bouncing on the pin. In the end it will be from a hall effect switch which also should not have any bouncing.

Ioannis:
I believe PBP will do negative numbers, Location should never be a negative number anyways as 0 would be the lowest number of counts you can have it will be zero we it is set up.

I think I'm going to try and use the internal timer which I haven't been able to work on it much as work has me burried. I did have some time to write out some code. I will post is below, if you guys would like to comment on it I would appreciate it. It might be a little chopy at the moment though.

************************************************** *****
@ DEVICE PIC12F683, INTRC_OSC_NOCLKOUT
@ DEVICE PIC12F683, WDT_ON
@ DEVICE PIC12F683, PWRT_ON
@ DEVICE PIC12F683, MCLR_OFF
@ DEVICE PIC12F683, BOD_ON
@ DEVICE PIC12F683, CPD_OFF
@ DEVICE PIC12F683, PROTECT_OFF

'* Hardware Setups *

INTCON = %10001000
PIE1 = %00000000
PIR1 = %00000000
OSCCON = %01110000

'* I/O Pin Descriptions Below *
'* PIN 1 - VDD - 5V *
'* PIN 2 - T1CK1 - Input - Pulses from Hall Effect *
'* PIN 3 -
'* PIN 4 - GP3 - Input for the direction of the Hall Effect *
'* PIN 5 - CCP1 - PWM Output to the Analog converter *
'* PIN 6 -
'* PIN 7 -
'* PIN 8 - VSS - Ground *

TRISIO = %00101000
WPU = %00000000
IOC = %00001000

'* Timer Setup *
T1CON = %00100111



Location var WORD

Mult_Count VAR BYTE

Was_Low VAR BIT

Pulse var gpio.3
Direction VAR gpio.5

Mult_Count = 0
Location = 0
Was_Low = 0

PAUSE 500

main:


GOTO main
end

************************************************** ***

[skimask]

Ioannis:
I believe PBP will do negative numbers, Location should never be a negative number anyways as 0 would be the lowest number of counts you can have it will be zero we it is set up.

Sure, PBP and assembly both will do negative numbers, but they won't show up the way you want them to...i.e.:

5 - 6 = -1, but PBP will show 255 (for a byte variable), 65535 (for a word variable).

You're going to want to add something like this to your program in post #4:

main:
IF Pulse = 1 AND Was_Low = 0 THEN
IF Direction = 1 THEN
Mult_Count = Mult_Count + 1
ELSE
if mult_count > 0 then mult_count = mult_count - 1
ENDIF
Was_Low = 1
ENDIF
...............

IF Mult_Count = -10 THEN(statement won't work the way you want it to in PBP)
Location = Location - 1
Mult_Count = 0
ENDIF

[Archangel]

Bruce:

Joe:
I'm using a function generator on the input with a scope on it as well and there is no bouncing on the pin. In the end it will be from a hall effect switch which also should not have any bouncing.




************************************************** ***

It was worth checking.
JS