SEROUT Just Garbage!

[Kman]

Im trying to get a PIC12F629 to send a simple "hello world" to my pc using windows Hyperterm, and I have the Pic conected as showed in the manual (1k resistor to pin 2 on the db9 connector)
All I get is garbage on the screen !
Can anyone HELP? here is my code that I trying to get working


INCLUDE "modedefs.bas"
DEFINE CHAR_PACING 1000
DEFINE OSC 4
Pause 200 ' Allow pic to Stabilize
TRISIO = %00000000
'ADCON0 = 0 ' no adc
OPTION_REG.7 = 0 ' gpio 0 - 2 digital
WPU = 255 ' week pull ups on all pins
CMCON = 7 ' turn week pull ups on
'ANSEL = 0

loop:

SerOut GPIO.0,N300,["Hello World"]
Pause 1000
SerOut GPIO.0,N300,["abc",13,10]
Pause 4000
GoTo loop

[mister_e]

you don't need those
DEFINE CHAR_PACING 1000
DEFINE OSC 4
OPTION_REG.7 = 0 ' gpio 0 - 2 digital
WPU = 255 ' week pull ups on all pins


AND you must set the OSCCAL to get accuracy with SEROUT. I hope your OSCCAL is not erase as now...

at the end your code will look like this.

@ __config _INTRC_OSC_NOCLKOUT & _WDT_ON & _PWRTE_ON & _MCLRE_OFF & _BODEN_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 = 0 ' set GPIO.0 as output
CMCON = 7 ' turn off analog comparator

Pause 200 ' Allow pic to Stabilize 

loop:

SerOut GPIO.0,N2400,["Hello World"]
Pause 1000
SerOut GPIO.0,N2400,["abc",13,10]
Pause 4000
GoTo loop

and this one is working @2400 baud

The most important thing here is to set the OSCCAL at the begining.

hope this help you

[geckogrotto]

you don't need those
DEFINE CHAR_PACING 1000
DEFINE OSC 4
OPTION_REG.7 = 0 ' gpio 0 - 2 digital
WPU = 255 ' week pull ups on all pins


AND you must set the OSCCAL to get accuracy with SEROUT. I hope your OSCCAL is not erase as now...

at the end your code will look like this.

@ __config _INTRC_OSC_NOCLKOUT & _WDT_ON & _PWRTE_ON & _MCLRE_OFF & _BODEN_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 = 0 ' set GPIO.0 as output
CMCON = 7 ' turn off analog comparator

Pause 200 ' Allow pic to Stabilize 

loop:

SerOut GPIO.0,N2400,["Hello World"]
Pause 1000
SerOut GPIO.0,N2400,["abc",13,10]
Pause 4000
GoTo loop

and this one is working @2400 baud

The most important thing here is to set the OSCCAL at the begining.

hope this help you

Im trying to connect a 12F675 to my machine to test it out but I get nothing in hyperterm.
Have
+5 to pin 1
1K resistor on pin 7 connected to pin 2 on DB9
Ground on pin 8
and a 0.1uF from pin 1 to 8.
pin 5 on DB9 to ground.

Do I connect first on hyper term or power the chip up first? what setting should I have?

Thanks

Using the above code and as 12F675 I can't get it to send anything.

[Kman]

Set up "Hyper term" using "VT100 Emulation".

Then set the comm port like this
Bits per sec = 2400
Data bits =8
Parity = none
Stops bits = 1
Flow control = none

[geckogrotto]

Tried that but still nothing

[Kman]

Can you post youre code!

[Kman]

Thanks for the Fast responce Mister E!
Since you said that the code was working for you, I rechecked my comm port settings (found FIFO buffers was not checked). I still had garbage so I added a .22uf cap on the powersuply and BINGO! "Hello worldabc"

I just wounder How my other code ever worked without a cap?

Kman

[mister_e]

I just wounder How my other code ever worked without a cap?

it can, but without OSCCAL... i don't think so, OR intermittent.

Place a 0.1uF or 0.22uF it's a need for all PICs apps. More than often people forget that the problem can comes from the hardware.

I always place 0.1uF + 10uF tantalum as close as possible to the PIC. Since now... only software problem

[Dwayne]

Hello Kman,

Kman>>I just wounder How my other code ever worked without a cap?<<

Well, this seems to be very common. I use a computer power supply, (stolen from older computers). If I do not use a cap on it, I will not get anything, and if I do, it will be garbage.

Dwayne