any possibility of reading an rs232 feed with a 10f200?

[netmgr]

any possibility of reading an rs232 feed with a 10f200?

i have a few of these chips and wondered if I could read an rs232 feed from a pc?

I did a search but I only found it on more advanced chips.

 

[blueroomelectronics]

What baud rate?

 

[Mike - K8LH]

any possibility of reading an rs232 feed with a 10f200?

Yes, using bit-banged Rx and/or Tx code...

 

[Nigel Goodwin]

Yes, dead simple, check my tutorials.

 

[netmgr]

Excellent, but there seems to be an issue with receiving a continuous stream if I read that correctly?

so im really needing a more advanced chip with a buffer?

Im reading at 9600 bps, 8 data bits, Even parity, 1 stop bit

 

[Nigel Goodwin]

Excellent, but there seems to be an issue with receiving a continuous stream if I read that correctly?

so im really needing a more advanced chip with a buffer?

Im reading at 9600 bps, 8 data bits, Even parity, 1 stop bit

What are you wanting to do with the data?, and is it a continuous incoming stream?.

 

[netmgr]

its fairly much continuous, i need to read it, look for a specific command and activate a relay.

 

[Nigel Goodwin]

its fairly much continuous, i need to read it, look for a specific command and activate a relay.

Bear in mind you've got the entire STOP bit to do that in. Is the command a single character?.

 

[netmgr]

no its several characters. its basically a 1 wire communications bus with stuff on it all the time non stop

 

[Mike - K8LH]

One way you might do it is to start processing the character after you've sampled the 8th data bit in the center of the bit. That leaves you with half of the 8th bit (about 50-usecs or 50 cycles) and the full stop bit (104-usecs or 104 cycles) to process the character before going back to wait for the next start bit.

 

[bbiandov]

The example is helpful but it's in ASM. Any chance to see an example of bit banged RS232 receiver in C? I have successfully managed to write an SPI receiver but that's too easy because the timing of SPI is simple. With RS232 there has to be reference to a timer and interrupt and that is where my retarded C skills fall short of figuring out how to do it

Thanks
~B

 

[Mike - K8LH]

A bit-banged RS232 receiver for a 10F200 in C?