BasicMicroUK - Forums

HELLO;I am using the nano 28,I have the hserial enabled.Every thing is fine with that,the problem I have,and my question is, how can I disable the hserial device(turn off) say if a switch is on...and then enable if the switch off ??? Something about turning of the bit associated with that register. THANKS FOR ANY HELP...

Hi,
I never used the hserial but I think you can do the following command to disable the serial port. At the end of the manual there are some reserved word that can be use to go directly to access the registers use in the nano chip.

''RCSTA = RECEIVE STATUS AND CONTROL REGISTER :: bit 7 = SPEN : bit 7 = 1 --Serial port enabled : bit 7 = 0 ' Serial port disable


RCSTA = 0 'instruction to zero the register bit 7 to disable the serial port.

Try it to see if it work. Good luck

Regards,
Tauro0221

HI TAURO 0221;
i tried this;
RCSTA.BIT7 = 0
did not seem to work..something else i need to put??? the hserial port was still active...
thanks..

Hi,
Then try both instructions. This will turn off the TX and RX.

TXSTA=2 : RCSTA = 0


You can find this information in the help/PIC16F882/883/884/886/887 Data Sheet page 254


Good luck.

HI;
This is how i typed in the code:

RCSTA.BIT7 = 0
TXSTA.BIT5 = 0

still the hserial device is active,and that keeps the ftdi chip thinking there is data rx/tx..
any other ideas???? thanks...

Hi,
I think TX need to be = 2. Do it like this:
TXSTA = 2 : RCSTA = 0
You will zero all other bits too. By doing one bit you left the other bits unchanged.

Regards,
tauro0221

HI:
Well i try it and still not work...
if i use:
ENABLEHSERIAL
SETHSERIAL1 H9600

device is enabled...reset micro will disable device...
maybe someway to do a code type of reset???
any ideas will help....thanks...

Hi,
This is what the manual explained how you turn on the tx/rx. By zeroing RCSTA and TXSTA you should stop the uart.

12.1.2.1 Enabling the Receiver
The EUSART receiver is enabled for asynchronous
operation by configuring the following three control bits:
• CREN = 1
• SYNC = 0
• SPEN = 1

12.1.1.1 Enabling the Transmitter
The EUSART transmitter is enabled for asynchronous
operations by configuring the following three control
bits:
• TXEN = 1
• SYNC = 0
• SPEN = 1

Do the following test read the RCSTA register and the TXSTA as soon you initialized the micro and them after you start the uart.
This will tell us how the status register it is set before and after .

dim tmp_1 as byte
dim tmp_2 as byte

tmp_1 = TXSTA
serout s_out ,i9600 ,[" TXSTA = ",dec tmp_1, 13 ]
tmp_2 = RCSTA
serout s_out ,i9600 ,[" RCSTA = ",dec tmp_2, 13 ]

Also you can try do something like this :
TXEN = 0 : SYNC = 0 : SPEN = 0
CREN = 0 : SYNC = 0 : SPEN = 0



Regards.
tauro0221

Hi,
Try one more thing. Do setserial1 0


Regards,
tauro0221

HELLO;
Thanks for the last post...that one solved the problem.
SETHSERIAL1 0
that command works great!!!
the uart now turns on and off as commanded.
Thank you for your time....

Hi,
Your welcome.
There are some instructions in the manual that they tell you how to use and enable them but they forgot to tell you how to turn it off.

Regards,
Tauro0221

THANK YOU