PBP3 Timer and RS232

Hello to all

I thought of making a small quite simple interface but that does not turn(shoot) as I want.
The program is realized in PBP3 and the PIC is programmed with one pickit3.
I use a PIC16F1825, chosen as its programmable internal clock to 32MHz and I make him(it) turn(shoot) in 16MHz with the internal oscillator.
A port RS232 TTL receiving "words" (in 100Kb/) representing the width of the impulse to take(bring) out on one other pine of the pic
The entrance(entry) RS232 is on Rx, I use the instruction Hserin, I put a temporary billposter LCD, information arrives well at the pic.
The problem is in the management of the timer.
I have impulses got out of it but the width does not really depend on the mass received(successful) word of command(order).
I know that I could use the "pulsout" without using the timer but it is not possible in my case because the information arrives too quickly in RS232 and I do not have time to receive information, to handle(treat) them, and to take out again them if I do not use the timer.
Have you a track(runway)??
Thank you in advance

CLAUDY

Hi Claudy

a small drawing showing how input and output signals behave ( un chronogramme, in our beloved French language ! ) would save loooooots of time, hair and coffee ...

no need to add your English is somewhat terrible ... that obviously doesn't help either ...

BTW Have my best wishes for this new year ...

Alain

Sorry.
I wanted to help a friend
Good evening

OK ...

I dug out the original Query ...

the goal is to output a pulse whose length is given by the RS232 message received ...

Here is the trail code ( excerpt ! )...

Code:

---

DEFINE OSC 16 'Oscillator speed in MHz: 3(3.58) 4 8 10 12 16 20 24 25 32 33 40
tmr1GE var  t1gcon.7
TMR1ON  var  T1CON.0
TMR1IF  VAR  PIR1.0      ' Alias RCIF (USART Receive Interrupt Flag)
LED1  VAR  PORTC.1      ' Alias LED
LED2  VAR  PORTC.2      ' Alias LED

IN_SBUS var PORTC.5    'p 5
S1  VAR  PORTA.5      ' p 2
i  VAR  BYTE  ' loop counter

' voir fichier "PIC16F1825.INFO"
'Config pour PIC16F1825
'*************************************************  *****************************
'Configuration
'*************************************************  *****************************
  #CONFIG
    __config _CONFIG1, _FOSC_INTOSC & _WDTE_OFF & _MCLRE_OFF  & _CLKOUTEN_OFF
    __config _CONFIG2, _PLLEN_OFF & _LVP_OFF
  #ENDCONFIG

on interrupt goto timer_int
disable
  osccon=%01111011    'page 70
  ansela=0    'page 126
  anselc=0
  option_reg=0  'page 185  bit7 à zéro pour pouvoir activer les résistances de pull up
  apfcon0=0  'page 121
  apfcon1=0  'page 122
  wpuc=%00100000  'page 137  pull up sur C5
  trisa=%11011111
  trisc=%11111001   

recom_test:
gosub essai_timer
gosub test_led
led1=0
debut:
led2=!led2
for i=1 to 100      'si je met "pause 100", la led régie par le timer clignote mais pas à la cadence du timer
    pause 1
    next i
goto debut


test_led:  ' teste les leds au début juste pour voir si le programme démarre
for i=1 to 10
led1=0
pause 50
led2=0
pause 50
led1=1
pause 50
led2=1
pause 50
next i
return

disable
timer_int:
'TMR1ON=0
led1=!led1
tmr1h=200
tmr1l=200
'TMR1ON=1
T1con=%00000101    'page 195
'tmr1GE=1
tmr1if=0
resume
enable

essai_timer:
''pour timer1 :
T1con=%00000100    'page 195
tmr1h=128
tmr1l=128
intcon=%11000000    'page 90
pie1  =%00000001    'page 91
pie3  =0
tmr1if=0
T1con=%00000101    'page 195 lancer une première fois le timer
'tmr1GE=1
return

End

---

OKayyyyyyyyyyyyyyy

I finally understood !!!

It's a trail to tweak the FUTABA ( R/C systems ) SBus protocol ...

output pulse is a classical servo signal ( 1.5ms +/- 500µs @ 50 Hz ) ...

so, final goal is to convert a RS232 info into a corresponding R/C pulse .... or to be exact ... convert an RS232 stream ( 4 servo positions ? ) into ... multiple R/C pulses ( 4 ? )

I wonder this kind of matter has already been treated here or aboard RC Groups forum ...


Alain ( who has no interest in that except ... friendship ! )