SERIN with a PIC12F675

[ewandeur]

Hi,

I am trying to use SERIN & SEROUT in a PIC12F675, it works fine with the SEROUT giving me a beatiful "Hello World", but things gone wrong with SERIN. It just does not work.

Somebody help me please!!!!

I am using the following code, is there any trick that I don't know?

Tks in advance.

************************************************** *
@ DEVICE pic12F675
@ DEVICE pic12F675, INTRC_OSC_NOCLKOUT
@ DEVICE pic12F675, WDT_ON
@ DEVICE pic12F675, PWRT_ON
@ DEVICE pic12F675, MCLR_OFF
@ DEVICE pic12F675, BOD_ON
' Internal Oscillator
' Enable watch dog timer
' Enable power up timer
' Disable MCLR pin
' Enable brown out detect


DEFINE OSCCAL_1K 1

INCLUDE "modedefs.bas"

TRISIO.0 = 1 ' set GPIO.0 as input
TRISIO.2 = 0 ' set GPIO.0 as output

CMCON = 7 ' turn off analog comparator
ADCON0.0 = 0
OPTION_REG.7 = 0
VRCON = 0

B0 var byte

Pause 200 ' Allow pic to Stabilize

loop:

serin GPIO.0,T9600,["A"],b0

SerOut GPIO.2,T9600,["Hello World"]
Pause 1000
SerOut GPIO.2,T9600,[#B0,13,10]
Pause 1000

GoTo loop

[Darrel Taylor]

The Pins are still in analog mode.

Add ...

ANSEL = 0

[ewandeur]

I decreased the baud rate to 1200 and added a 4MHz Xtal.
I also use the ANSEL as posted and get the response of SERIN.

Tks a lot.

[evilpic]

I really need to comunicate a LCD serially with the computer using a PIC18F452, i'm using the windows hyperterminal to send characters through the RS232 and a MAX232 driver circuit included on my PIC trainer, this is the code i'm using to display those characters on the LCD but all i get is kinda chinese characters or nothing instead of the key i'm pressing... i guess there's something wrong with my hserin but i can't figure what exactly. i'm new to PIC so have mercy on my soul

DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 20h
DEFINE HSER_BAUD 9615
DEFINE HSER_SPBRG 25
W0 var BYTE

'Set LCD Data port
DEFINE LCD_DREG PORTB
' Set starting Data bit (0 or 4) if 4-bit bus
DEFINE LCD_DBIT 4
' Set LCD Register Select port
DEFINE LCD_RSREG PORTB
' Set LCD Register Select bit
DEFINE LCD_RSBIT 2
' Set LCD Enable port
DEFINE LCD_EREG PORTB
' Set LCD Enable bit
DEFINE LCD_EBIT 3
' Set LCD bus size (4 or 8 bits)
DEFINE LCD_BITS 4
' Set number of lines on LCD
DEFINE LCD_LINES 2
' Set command delay time in us
DEFINE LCD_COMMANDUS 2000
' Set data delay time in us
DEFINE LCD_DATAUS 50
DEFINE HSER_CLROERR 1 'clear overflow error bit

pause 500
Lcdout $fe, 1
W0=0
again: HSERIN [ W0 ]
if W0 = 0 then again
Pause 500 ' Wait for LCD to startup
Lcdout $fe, 1 ' Clear LCD screen
Lcdout W0 ' Display W0
Pause 500 ' Wait .5 second
goto again

[ewandeur]

I had a similar problem too.

Try to define the parity

' Use only if even parity desired
DEFINE HSER_EVEN 1

' Use only if odd parity desired
DEFINE HSER_ODD 1


Also, include a small capacitor between ground and Vcc PIC terminals, it help a lote (I used a 22pF in my project).