pulsin followed by serin2 problem

[mister_e]

It's amix of many things. One thing scratch my brain

main: 
    input PORTB.0
    input PORTD.4
    gosub xmit_off
    gosub wait_for_t0

wait_for_t0: 
    if portb.0= 0 then wait_for_t0 ' loop until rssi goes high

Take care of the Gosub / Return use. It's amazing how fast your program can behave weird when using few nested gosubs...

the following snip is the source of your headache

wait_for_t0: 
    if portb.0= 0 then wait_for_t0 ' loop until rssi goes high
    
    pulsin portd.4,1,PLENGTH1 ' MEASURE TIME C2 IS HIGH AND STORE
    IF PLENGTH1 > 255 AND PLENGTH1 < 270 THEN COUNTPULSes ' 42 usec error allowed
    gosub get_comnd
        ' made into sub routine get_cmnd 
        'serin2 b2,16780,1000,wait_for_t0,[WAIT ("$$"),cmnd] ' get command wait $$ timeout 1 secs added
        'HSEROUT ["debug command = ",dec2 cmnd,13,10]
    GOTO wait_for_t0 
    '
    '
    '    
get_comnd: 
    serin2 b2,16780,1000,wait_for_t0,[WAIT ("$$"),cmnd] ' get command wait $$ timeout 1 secs added
    HSEROUT ["debug command = ",dec2 cmnd,13,10]
    return

easy to overflow the stack with this