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No, that won't work right now.
Could you post another picture showing the connections?
Serial comm using pic16f877a....
- Thread starter RRITESH KAKKAR
- Start date
Could you post another picture showing the connections?
OK, now you tell me the connection i will check/do according to it.
Should we send data from PC then if A is pressed led will glow something like that??
someone suggest me this:
someone suggest me this:
I doubt that. Since, provided you listened, you got a USB to TTL converter, the output should be TTL... The only application I could think to use full RS-232, would be a USB to serial port (DB9)), which this is not.
Sure, you can do that. In fact, a good idea might be to illuminate the LED on the UART receive interrupt, that way you can know the PIC had received something...
Well, as long as you've made the connections you've said you have, it should be fine...
...thank you for that wonderful insight, there, Eric....
Are we still talking about this module http://robokits.co.in/shop/index.php?main_page=product_info&cPath=6_64&products_id=64?
A test could be to connect the Tx and Rx data lines together on the latter module. If it work whatever sent from the terminal program will come back again as an echo. As far as I see it. Your unit works with TTL level signals so it should be OK to connect it to a micro-controller
A test could be to connect the Tx and Rx data lines together on the latter module. If it work whatever sent from the terminal program will come back again as an echo. As far as I see it. Your unit works with TTL level signals so it should be OK to connect it to a micro-controller
Yes, that was done a few pages back...
...it's a long thread, I'm barely willing to sift through it...
Now what to do??
How about a picture showing the connections?
you tell me i will make according to it!!
He wants to know what you have NOW. You claim it's not working--so show us how you have it connected.
And again, enough with the exclamation points!!!!!
I have the same circuit working well with other codes..
as i said the tx is connected to rx vice versa and power is taken from that module only no external power taken from battery.
as i said the tx is connected to rx vice versa and power is taken from that module only no external power taken from battery.
A picture would help us verify, but you don't want us to, that's fine...
To be entirely clear and not leave room for implications that may be wrong, you have the RX of the USB to TTL module connected to the TX pin of the PIC? Likewise, the TX of the USB to TTL module connected to the RX pin of the PIC. The grounds are connected together, meaning the PIC is sharing the same ground as the USB to TTL module, and power (+5V) is also derived from the USB to TTL module. You have a 20MHz crystal attached to the PIC, with the proper capacitors on it. Both power and ground pins on the PIC are connected together.
Is this how you have it hooked up?
YES.....exactly same
and don't worry of crystal it is also working fine because ledbling and other code are working fine in board.
and don't worry of crystal it is also working fine because ledbling and other code are working fine in board.
That does not mean it is working to the standard of the timing required in UART communication. What are your capacitor values on the crystal?
Have you tried powering the PIC from an external power supply? If not, try that, hut remember to connect grounds together, do not connect power...
I am using 20Mhz crystal with 12pF and i have used same power from USB for UART testing not from external batter source.
