The TX and RX of RS-232 is essentially UART output (UART -> Voltage
Converter -> connector, matches standard). Also, remember that RS-232 uses
+/- 12V (nominal) levels, so you will need conditioning before connecting to
a PIC.
Good Luck,
-jjf
-----Original Message-----
From: Ben Hamby [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 25, 2000 9:36 AM
To: Palm Developer Forum
Subject: RE: Serial Communications
I see what you mean now, as far as the differences between the SPI and the
common UART(ie. 16550)...However, isn't the RS232 supposed to have similar
output to the SPI? Ie. defaults high, assertions are low....and I thought
the Palm had an RS232...does it have both and defaults to using the 16550
protocol? Or am I out in right field without a glove....
Thanks,
Ben
At 03:14 PM 7/24/2000 -0700, you wrote:
>The SPI is quite a bit different from a standard async serial port. You
can
>implement an async serial port in software on most PICs. I did one a long
>time ago on a PIC16C50 derivative and it worked pretty well.
>
>If you go to www.microchip.com and select Application Notes, a note on
>implementing an async port will be one of the first ones listed.
>
>Good Luck,
>-jjf
>
>-----Original Message-----
>From: Ben Hamby [mailto:[EMAIL PROTECTED]]
>Sent: Monday, July 24, 2000 12:43 PM
>To: Palm Developer Forum
>Subject: Serial Communications
>
>
>Hello,
>
>I'm doing serial communication between my Palm and another device that uses
>a PIC processor. Just had a few questions I was wondering if anyone could
>answer about the format of the output more than how to program it. (all of
>this is from the Tx line) Right now, I just send some information out of
>the SerSend command and it sends fine, but I was wondering if the Palm by
>default includes a 1 bit start bit. Currently, it seems like the line
>defaults to Low(0) and then sends a 1 bit High(1) out of the Tx before it
>sends a byte. Is this how normal serial communication is performed? I
>thought the serial communication went in a similar style to the SPI, where
>it defaults to a High and then sends a 1 bit Low before sending the
>information? Is my information incorrect? If it is, and that is how normal
>serial communication is performed, does anyone have any suggestions to get
>it to work with the SPI?
>
>Thanks,
>Ben
>
>
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