hserin repeats characters

[LEH]

20M2. Tried using serin and serout, did not receive any characters. using hserin characters get repeated infinetly. If I type "R9" I see R999999999999999... on the terminal. I am using an RS232 converter. I will try to attach the program I am using.View attachment rgbpwm.bas

 

[hippy]

Not entirely sure why it's doing what it is doing, but it might be worthwhile figuring out why SERIN isn't working as that is probably easier to use if you are just expecting letter-digit-digit commands.

 

[Technical]

Clr:
hserin b2
if b2 <> $FF then
    hserout 0,(b2)
endif
pause 250
hserin b3
if b3 <> $FF then
    hserout 0,(b3)
endif
pause 250
hserin b4
if b4 <> $FF then
    hserout 0,(b4)
endif
pause 150
if b2 = $FF then Clr

hserin is non blocking - it checks for a byte in the buffer, if nothing received it immediately moves onto next part of code. All the pauses in the loop mean you cannot predict which variable will get a particular byte.

You send two bytes "R" and "9"

So what happens above if b4 gets a '9' and b2 is still $FF and no more bytes received - you end up with an infinite loop that will send out multiple 9s.....

 

[LEH]

Got serin to work now, but none of the comparisons in the program work. So serin B.6,T9600_8,b3 will get my input and the serout will send it back. If I press '9' while the serin is running, and do a serout C.0,T9600_8,#b3 it will send 57 to the monitor, but if I try to do a comparison say if 'b3 = 57 then' the comparison will fail.

 

[hippy]

Perhaps post your full code so it can be analysed to see what is happening.

SEROUT #B3 showing 57 indicates B3 has value 57 a "9" character in it. Thus "IF B3=57 THEN" or "IF B3="9" THEN" should work.

 

[LEH]

My bad, seeing your reply helped me find my stupid mistake.

 

[hippy]

Most mistakes are D'Oh! moments when discovered, blindingly obvious in hindsight

Don't let that put you off asking for help, because sometimes just asking is all it takes to figure the problem out.