[SOLVED] interfacing SR04 ultrasonic sensor with 16f877 UART not working

[asthra123]

hello everybody
please help me because i cant find out the problem in my asm code which is not working with uart tx(txpoll) subroutine . but without "UART TX(TXPOLL) subroutine the code is working fine.

 

[KlausST]

Hi,

which is not working

--> give a useful and detailed error description.

Klaus

 

[asthra123]

Am herewith attaching screenshot of proteus simulation with & Without tx subroutine. Without tx (TXPOLL) subroutine the simulation is working fine. With subroutine, the txpoll code is not getting executed
Screenshots: https://obrazki.elektroda.pl/5644819200_1498628243.jpg
https://obrazki.elektroda.pl/5008379000_1498628244.jpg

 

[KlausST]

Hi,

but without "UART TX(TXPOLL) subroutine the code is working fine.

--> Then do it this way.

Klaus

 

[paulfjujo]

hello,

check bank .. for SPBRG & TXSTA using

    bcf        INTCON,GIE 
        bsf            STATUS,RP0 
    bsf        PIE1,TMR1IE    
        banksel         T1CON                           
        bsf           T1CON,TMR1ON
    
initsci  
       banksel  SPBRG     ;  <-------------------------  bank 1 !  
       movlw  19h         
       movwf  SPBRG
       movlw  25h         ;set up for async operation
       movwf  TXSTA
       bcf    STATUS,RP0  ;back to file 0 for a moment
       movlw  90h         ;enable serial port operations and the associated pins
       movwf  RCSTA
       clrf   TXREG       ;clear our serial port buffers for start up
       clrf   RCREG
       call   init

 

[asthra123]

dear paulfjujo......
thank you very much its working......
thankyou for your valuable reply