pulse simulation

[nicolasronan]

hello
i want simulate a cycle rpm sensor for automotive.
http://www.geea.org/IMG/swf/capteur_vitesse_6.swf

the frequency must be able.
i ve test this code (!!! it s not the same cycle of the picture)
' _!-!_!-!__!--!_!-!_!-!

' pic16F877

' Variable
W0 var word
W1 var word
i var byte
up var PORTB.4
dn var PORTB.5
w0=0
i=0
'DN Define frequency down button
'UP Define frequency up button
PO con 3 ' Define pulse output pin

low PO ' Initialize output polarity
inc:
If (up = 1) Or (W0 = 10000) Then decr ' Increment freq on button
W0 = W0 + 10

decr:
If (dn = 1) Or (W0 = 0)Then pulse ' Decrement freq on button
W0 = W0 - 10

pulse:
for i =1 to 38
Pulsout 3,W0 ' Generate pulse
Pause W0/100 ' Intra-pulse delay
next i
Pulsout 3,W0
W1=W0*2
Pause W1/100
Pulsout 3,W1

Goto inc ' Forever

this code is ok but not optimized with button
how do? use pulsout or pwm?

thank

[Acetronics2]

Hi, Nicolas

Use DT interrupts !!! ... it's not so difficult to use.

http://www.picbasic.co.uk/forum/showthread.php?t=3251

or a little trick I discovered :

insert " DEFINE INTHAND _INC" at the top of the program ... This places a "GOTO _INC" at location 00004 of the ASM program.

Now trim the interrupt register ( INTCON) to allow an " interrupt on PortB Change "

Place a correct preset value for W0 ... 0 is not a good value !!! ( in "decr:" nor !!! )

Place a "GOTO PULSE " before "inc"

Think to re-enable interrupts, placing " INTCON.7 = 1" just past "pulse" label

last, change "GOTO inc" to "GOTO pulse"

That should go at first...

Next step will be to use BUTTON instead of IF-THEN ... just to use the Auto-repeat feature ...


One more step ...

Have a look to Motorola ( yessss ... Freescale !!! ) "TPUPN xx" Application Notes ...

really Great !!!

http://www.bgsoflex.com/megasquirt.html


Alain

[nicolasronan]

how place a "GOTO _INC" in microcode studio.
interrupt register ( INTCON) to allow an " interrupt on PortB : INTCON=00001000 , it s ok?
thank

[nicolasronan]

if i use
ASM
GOTO_INC
ENDASM
it 's ok?

[Acetronics2]

and how to place it in location 4 ????

D.E.F.I.N.E. !!!!!

Alain

[nicolasronan]

sorry bur i dont understand how use interrupt on a port.
i m bad

[nicolasronan]

I work but it is hard
this code work

' pic16F877

'cycle = !-!_!-!_!-!_!-!_!-!__!--!_
' i use lcd just to see W0
' Define LCD registers and bits
DEFINE LCD_DREG PORTD
DEFINE LCD_DBIT 8
DEFINE LCD_RSREG PORTE
DEFINE LCD_RSBIT 0
DEFINE LCD_EREG PORTE
DEFINE LCD_EBIT 1
DEFINE OSC 4 ' use 20 MHZ oscillator

INCLUDE "modedefs.bas" ' Include serial modes

W0 var word
W1 var word
i var byte
up var PORTB.4
dn var PORTB.5
rst var portb.6
b0 var byte
PO var portb.3 ' Define pulse output pin

'initialisation
ADCON1 = %0000111
TRISA = %1
w0=100
i=0
B0=0
Low PO ' Initialize output polarity
intcon=%0001000
On Interrupt Goto bouton ' Define interrupt handler
INTCON = $90 ' Enable INTE interrupt

'*********************
pulse:
for i =1 to 5
Pulsout 3,W0 ' Generate pulse
pause W0/100 ' Intra-pulse delay
next i
Pulsout 3,W0
W1=W0*2
Pause W1/100
Pulsout 3,W1
'visualisation sur LCD
Lcdout $FE,$C0,"W0 = ",dec W0," "
Goto bouton
'*********************
inc:
W0 = W0 + 10
goto pulse
'*********************
decr:
W0 = W0 - 10
goto pulse
'*********************
reset:
w0 = 100
goto pulse
'*********************
bouton :
disable
button up,1,0,0,b0,1,inc 'si bouton1 sur port1=1 aller à calibration
button dn,1,0,0,b0,1,decr 'si bouton1 sur port1=1 aller à calibration
button rst,1,0,0,b0,1,reset 'si bouton1 sur port1=1 aller à calibration
enable
goto pulse


but why on the piture the period after double pulse the low period its not equal w0?

[nicolasronan]

help please

[Acetronics2]

PAUSE Missing after PULSOUT 3, W1

Goto Pulse instead of Goto Bouton ---- mais à quoi servent donc les interruptions ???

et on termine en plaçant la visualisation dans le programme d'interruption juste AVANT le Enable !!! ( ça évite les affichages Ollé, Ollé ...)


Alain

[nicolasronan]

to simplify :no button

' pic16F877

'cycle = !-!_!-!_!-!_!-!_!-!__!--!_
' i use lcd just to see W0
' Define LCD registers and bits
DEFINE LCD_DREG PORTD
DEFINE LCD_DBIT 8
DEFINE LCD_RSREG PORTE
DEFINE LCD_RSBIT 0
DEFINE LCD_EREG PORTE
DEFINE LCD_EBIT 1
DEFINE OSC 4

INCLUDE "modedefs.bas" ' Include serial modes

W0 var word
W1 var word
i var byte
up var PORTB.4
dn var PORTB.5
rst var portb.6
b0 var byte
PO var portb.3 ' Define pulse output pin

'initialisation
ADCON1 = %0000111
TRISA = %1
w0=1000
i=0
B0=0
Low PO ' Initialize output polarity

'*********************
pulse:


for i =0 to 5
Pulsout 3,W0 ' Generate pulse
pause W0/100 ' Intra-pulse delay
next i
I=0
Pulsout 3,W0
W1=W0*2
Pause W1/100
Pulsout 3,W1 'double pulse ok
pause W0/100
'visualisation sur LCD
Lcdout $FE,$C0,"W0 = ",dec W0," "
Goto PULSE 'repeat cycle

I want a double pulse in end cycle but before new cycle , i want simple pediod low but it not equal w0!!!

[nicolasronan]

I remove lcd and it s ok

[nicolasronan]

now, the interruption does not work.
they are detected but not the button pressed and w0 pass to 0

' pic16F877

'cycle = !-!_!-!_!-!_!-!_!-!__!--!_
' i use lcd just to see W0

DEFINE OSC 4

INCLUDE "modedefs.bas" ' Include serial modes

W0 var word
W1 var word
i var byte
up var PORTB.4
dn var PORTB.5
rst var portb.6
b0 var byte
PO var portb.3 ' Define pulse output pin
OPTION_REG = $7f
'initialisation
ADCON1 = %0000111
TRISA = %1
w0=100
i=0
B0=0
Low PO ' Initialize output polarity
INTCON.0 = 0 'Clear Port Change Interrupt Flag bit
On interrupt goto bouton ' Define interrupt handler
INTCON =%10001000 'Enable RBIE

'*********************
pulse:


for i =0 to 5
Pulsout 3,W0 ' Generate pulse
pause W0/100 ' Intra-pulse delay
next i
Pulsout 3,W0
W1=W0*2
Pause W1/100
Pulsout 3,W1
pause W0/100
Goto pulse

'*********************
inc:
'Lcdout $FE,$C0,"INC"
W0 = W0 + 1
W1=W0
resume
goto pulse
'*********************
decr:
W0 = W0 - 1
W1=W0
goto pulse
'*********************
reset:
w0 = 100
W1=W0
goto pulse
'*********************
DISABLE
bouton :
INTCON.0 = 0 '
if PORTB.4=0 THEN goto inc 'not detect
if PORTB.5=0 THEN goto decr 'not detect
if PORTB.6=0 THEN goto reset 'not detect
GOTO PULSE
ENABLE

[Acetronics2]

do not mix resume and goto's ...

a clear algorithm could help you.

Alain