PBP3 Timer and RS232

[Acetronics2]

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 ! )...

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 ! )