HSERIN & Interupts (aka controlling PIC programs from a remote PC)

[HankMcSpank]

Sorry, I was just stripping out the interupt bits (since they are compiling fine now), but yes, I can see how that's confused you all!

Anyway, to show off my new found "box" skills, here you go...

@MyConfig = _XT_OSC & _WDT_ON & _MCLRE_ON & _CP_OFF 
@MyConfig = MyConfig & _BOR_OFF 
@ __config MyConfig 

INCLUDE "DT_INTS-14.bas"     ; Base Interrupt System
INCLUDE "ReEnterPBP.bas"     ; Include if using PBP interrupts 

DEFINE OSC 4
DEFINE HSER_SPBRG 25
DEFINE HSER_TXSTA 24h
DEFINE HSER_CLROERR 1
ANSELH=0
ANSEL=0
CM1CON0 =0
CM2CON0 =0
CM2CON1 =0
adcon1=0
TRISB.6 = 1
TRISB.7 = 0
TRISC=%00000000 ; set all Port C pins as outputs
rcsta.7=1 'SPEN serial port enable bit
low portc.0
low portc.1
low portc.2
low portc.3

mybyte var byte
'::::::::::::::::::::::::::::::::::::::::::::::::: ::::::::::::::::::::::::::
ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler    RX_INT,  _Get_char,   PBP,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor
ENDASM
'::::::::::::::::::::::::::::::::::::::::::::::::: ::::::::::::::::::::::::::
@   INT_ENABLE   RX_INT     ; enable external (INT) interrupts


loop:
if mybyte="1" then
hserout ["got it!"]
endif

if mybyte=!"1" then
hserout ["DIDN'T GET IT!",13,10]
hserout [mybyte,13,10]    ' (tried to add in this line to see onscreen what the content of mybyte is - nothing output!)
PAUSE 499
mybyte=0
endif
goto loop



'---[USART RX - interrupt handler]---------------------------------------------------
Get_char:
     hserin 100,noreceived,[mybyte] 'Get byte
     noreceived: 'or if timeout return
@ INT_RETURN

My (noob) take here is that, when a key is pressed, the interrupt routine jumps to the Get_char - this keyboard 'keyed' "data" is then stored in the variable mybyte - but what will the actual contents of mbyte be ? For example if I press a "1" key on the keyboard will it be 00000001 (unlikely!), or 00110001 (binary for 49 - the ASCII code for the number "1"). Once I can figure out this bit, then I can make sure my "if" takes account of it. (that'll be my next question!) Also, the line I bolded...I was trying to see onscreen what the content of the variable mybyte was - but nothing was output?

BTW The low portc.0 low portc.1 are in there because I have a Microchip low pin count demo board & my (eventual) target for today is to get some LEDs to light up when certain keys on my PC keyboard are pressed - I'm a simple kind of easy to please chap, who marvels at this kind of thing & insists all around me marvel too! (though it irks my two year old something rotten when I interrupt his Thomas The Tank Engine viewing)