Counting led blinks..

[mackrackit]

Does the Loop2 part still work in the code with the usbtx sub routine? It looks to me like it should work. Or maybe it is too long between USBservices.

If that is the case include the routine to service the USB in the background like the example gave for testing.

[tacbanon]

Hi, yes Loop2 still works(i increments), but I wonder why usbtx does not sends the "c" character to pc?

regards,
tacbanon

[mackrackit]

Give this a shot. It works here.

INCLUDE "cdc_desc.bas"
INCLUDE "USB_ASM_Service.pbp"    ' Base Interrupt System


LED       VAR PORTB.0
Buffer    VAR BYTE[10]
Buffer2    VAR BYTE[10]
Cnt       VAR BYTE


i    var byte
ADCON1 = 15               ' Set all I/Os to Digital      
CMCON = 7                 ' Disable Comparators
Cnt = 5
i = 0
'****************************************************
TRISA.4 = 1 ' RA4/T0CKI = input to TMR0 counter
'If you prefer, then increment on low-to-high transitions
T0CON   = 111000        
LOW LED
Loop1:
TMR0L = 0     ' Clear TMR0 count before start   
'**************ADDED COde
gosub usbtx   ' transmit character c to pc
'**************************** 
Loop2:
WHILE TMR0L = 0 ' Wait for high-to-low transition      
WEND           ' on RA4/T0CKI
pause 5
PORTA.2 = 1    ' LED on to indicate transition seen     LED PORTA.2 
i=i+1       ' Clear screen
buffer[0] = 49
Buffer[1] = 13       
USBOut 3, Buffer, 2,Loop2
LOW LED   ' LED off
goto Loop1   


usbtx:
TOGGLE LED
Buffer2[0] = 99
Buffer2[1] = 13       
USBOut 3, Buffer2,2,usbtx
return

[tacbanon]

Hi, thanks for the time. I run your code...but the character "c" appears only when a pulse is detected in my setup. Hmm it should be running as expected...

regards,
tacbanon

[mackrackit]

That is what I thought you wanted?

If you want it to send "C" continuously

WHILE TMR0L = 0 ' Wait for high-to-low transition  
  GOSUB usbtx  
  PAUSE 100 
WEND           ' on RA4/T0CKI

[tacbanon]

Hi, sorry if was not making clear..it's working now. acctually the reason I need to send "c" is to identify if the usb device is connected to the my pc application. My next step is to incorporate rtc and sdcards for record keeping. I will post my code later... thanks mackrackit.

regards,
tacbanon

[mackrackit]

glad I could help.