[OT?] a SIMPLISTIC RS232 data logger using some flash device --- does it exist commercially?
- From: Richard Owlett <rowlett@xxxxxxxxxxxxx>
- Date: Tue, 21 Jun 2005 15:03:09 -0500
Caution: I explicitly stated "simplistic" on purpose.
I did not say simple, elegant, robust or many other adjectives.The input sequences will be a rs232 level 4800 baud data stream of <=100 characters terminated by a <CR><LF> pair no more frequently than once per second.
I wish this unedited data to be stored on a 'compact flash' device which may be read by a USB device having relatively standard interface to a WinXP system.
I *explicitly* do not require this flash device to have a file system.
A file system might actually be an impediment.
I envision each <CR><LF> terminated "sentence" being stored in a sequential block. [ Reading software responsible for ignoring any thing after <CR><LF>. ]
*HOW I ENVISION DEVICE* One RS232 input Power switch Record On/Off switch RESET switch receptacal/eject mechanism for flash device
*HOW I ENVISION USING DEVICE* With power off insert flash device. Attach RS232 input device. Turn on power. If starting new record, press RESET switch Set RECORD to "on" record data Set RECORD to "off" EJECT flash device
What I envision:
UART receives data bytes
When byte received it is stuffed in a local RAM at address held in a "counter"
This counter is incremented each time UART has received a character
<CR><LF> receipt triggers passing this buffer to 'compact flash' device.
Passing this data triggers another counter so next character stream directed to another physical data block.
I have 2 questions. 1. did I make my intent clear? 2. is it workable.
BTW my intended real of application is recording data from a GPS receiver.
I any have a suitable existing device, contact me privately. rowlett@xxxxxxxxxxxxx is valid
.
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