serout2 with 2 stop bits

[santamaria]

i am using the pic 16f628.i would like to communicate with srf02 ultrasonic module.this module accepts only 9600 2 stop no parity.i can't find if i can choose to send with serout command with 2 stop bits.is it possible or i have to use the hardware usart?i am using pic basic pro v2.47

thanks

[Kamikaze47]

Correct me if I'm wrong, but isn't the stop bit a high bit, and doest the line idle high?

If that is the case, just adding a quick pause after the serout2 command should result in ensuring that the line stays high for a short time after the first stop bit is done.

[santamaria]

thanks for your reply i will try it....

[Kamikaze47]

what baud rate are you using?

[santamaria]

hi kamikaze47,
the baud rate is 9600.i check it in hyper terminal and working both tx and rx with stop bit 1. i can't understand how and why but it's working. i connected to my project and working also perfectly. i am using serout2 command.
thanks for your help.if anyone need sample code for srf02 tell me.

[Kamikaze47]

At 9600 baud, each bit is approx 104uS long, so a PAUSEUS 104 after your serout command should represent that 2nd stop bit.

I'm glad its working 4 u.

[BrianT]

Adding

DEFINE CHAR_PACING 104 'Serout character pacing in us

will give you an extra 104 uSecs between characters - effectively giving you an extra stop bit at 9600 bps.

HTH
Brian

[jellis00]

hi kamikaze47,
if anyone need sample code for srf02 tell me.
In hopes you are still monitoring this thread, Kamikaze, I would very much like to collaborate with you and receive a copy of your sample code for using the SRF02.
I am currently developing an application that will work with the SRF02. It uses a DS1337 clock's Alarm1 (INTA) as an interrupt to an 18F4550 MCU to wake it up out of SLEEP mode, take 6 range measurements from the SRF02, average the 6 measurements into a single average value, store it in EEPROM and go back to sleep till the next interrupt. Interrupts can be set according to DS1337 clock Alarm settings or a person could replace the clock interrupts with a push button interrupt to manually take measurements and display them.
If you could post your code here it would be a help to me and possibly to other members of this forum.

BTW, I see that you had some difficulties in using a serial interface with the SRF02. I am using I2C interface which seems a lot simpler. Curious....how come you chose to use the serial interface option as opposed to I2C??

[Kamikaze47]

i never used the srf02. I was just helping out santamaria with his serial problems.

But it sounds like you have a good idea about what you want to do. Why not give it a go. Were are you getting stuck?

[jellis00]

if anyone need sample code for srf02 tell me.
Sorry about that, Kamikaze.
Santamaria, if you are out there, can you please answer my above post??
Thanks!