serial cache setup

(serial-cache-setup dev char1 char2)

serial-cache-setup setups a cache, which scan through serial data and look for given characters at beginning and end and saves the middle parts. The reason is that rs232 communication protocol often define a start and end character so this generic cache system can capture such delimited messages.

Parameter	Description
dev	Serial device obtained from rs232-try
char1	Starting character to look for in the serial data
char2	Ending character to look for in the serial data

Example

Example 1: Setup serial cache which captures strings starting with # and ending with newline

(serial-cache-setup dev #x23 #x0A)

Example 2: Setup serial cache which starts with a number (ASCII 48-57) and ends with newline

(serial-cache-setup dev (lambda (l) (if (fx>= l 48) (fx<= 57))) #x0A)