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PICJoey
Joined: 19 Feb 2009
Posts: 1
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| pic 16F88 usart issue |
 Posted: Thu Feb 19, 2009 7:08 pm |
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Hi,
I am workin on PIC16f88 USART and not able to get it to work. I actually downloaded a code from a forum and programmed the microcontroller with it, but it doesnt work.
The code has to transmit the word "test" to the hyperterminal at 9600Mbps, I cannot see any thing in the hyperterminal. I am using a external 4MHz oscillator.
Every thing in the code seems to b fine, all the registers set properly. I dont know whats goin on wrong  . Please let me know if some thing is wrong with the code.
| Code: |
include p16f88.inc
org 0x000
count equ 0x20
main ; bcf STATUS,RP0
; bcf STATUS,RP1
clrf PORTA
clrf PORTB
; RB2 - Incoming Data RX
; RB5 - Outgoing Data TX
movlw B'11011111'
bsf STATUS,RP0
movwf TRISB
; 4MHz for 9600 baud rate
; See http://www.picbasic.co.uk/forum/showthread.php?t=214
movlw 0x19
movwf SPBRG
; 8-bit asych mode, high speed uart enabled
movlw 0x24 ; BRGH=1 20 BRGH=0
movwf TXSTA
; Serial port enable, 8-bit asych continous receive mode
movlw 0x90
bcf STATUS,RP0
movwf RCSTA
loop1 movlw 0x45 ;'t'
call putc
call delay
movlw 0x65 ;'e'
call putc
call delay
movlw 0x47 ;'s'
call putc
goto delay
movlw 0x45 ;'t'
call putc
call delay
movlw 0x0D ; CR
call putc
call delay
movlw 0x0A ; LF
call putc
; remove next line and program will echo input from PC
goto loop1
loop2 nop
getc btfss PIR1,RCIF
goto getc
movf RCREG,W
call putc
goto loop2
putc btfss PIR1, TXIF
goto putc
movwf TXREG
movlw 0xf
movwf count
return
delay
nop
nop
nop
nop
decfsz count
goto delay
return
end
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dyeatman
Joined: 06 Sep 2003
Posts: 1933
Location: Norman, OK
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| Posted: Thu Feb 19, 2009 7:24 pm |
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...
Last edited by dyeatman on Thu Feb 19, 2009 7:35 pm; edited 1 time in total |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Feb 19, 2009 7:26 pm |
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Do you have the CCS compiler ? This is not a Microchip MPASM forum.
If you do, here's a test program:
| Code: | #include <16F88.H>
#fuses INTRC_IO, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=8000000)
#use rs232(baud=9600, xmit=PIN_B5, rcv=PIN_B2, ERRORS)
//============================
void main()
{
int8 c;
while(1)
{
c = getc(); // Get char from PC
putc(c); // Send it back to the PC
}
} |
If you're using MPASM (with MPLAB), then you should ask your questions
in the Microchip UART forum:
http://forum.microchip.com/tt.aspx?forumid=12 |
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