Maximum Usable Baud Rates for SERIN Formatting Options
tomcrawford
Posts: 1,126
in BASIC Stamp
I measured the maximum SERIN baud rates for a number of formatting options and three flavors of BS-2. A summary is attached. The BS-2 program used to make the measurements and the Prop program used to generate the test strings are attached.
The summary has a row for each baud rate. The "standard" baud rates are shown in bold text. Each row shows the results for each of three flavor of BS-2. For each flavor, there are four columns. First is the baud rate code, then a column indicating the results for STR/SPSTR, a column for Decimal, Hexadecimal formats, and a column for WAIT/WAITSTR and SKIP. The green area indicates that function worked correctly at the indicated baud rate.
For every flavor, bare STR/SPSTR supports the highest baud rate. If you have a situation where the baud rate absolutely cannot be reduced, you can perhaps at least capture the incoming string. Of course, you must then parse the string by hand (no DEC/HEX, for example).
The DEC and HEX formatters take time and so the maximum baud rates are reduced.
The slowest are the SKIP and WAIT/WAITSTR qualifiers. I combined SKIP with WAIT as well as SKIP with WAITSTR in my testing.
The summary has a row for each baud rate. The "standard" baud rates are shown in bold text. Each row shows the results for each of three flavor of BS-2. For each flavor, there are four columns. First is the baud rate code, then a column indicating the results for STR/SPSTR, a column for Decimal, Hexadecimal formats, and a column for WAIT/WAITSTR and SKIP. The green area indicates that function worked correctly at the indicated baud rate.
For every flavor, bare STR/SPSTR supports the highest baud rate. If you have a situation where the baud rate absolutely cannot be reduced, you can perhaps at least capture the incoming string. Of course, you must then parse the string by hand (no DEC/HEX, for example).
The DEC and HEX formatters take time and so the maximum baud rates are reduced.
The slowest are the SKIP and WAIT/WAITSTR qualifiers. I combined SKIP with WAIT as well as SKIP with WAITSTR in my testing.
Comments
That's great work. I've used 38400 on the BS2 with STR and it works just like you showed. Any chance you have a BS2sx you can test and add to your table?