You should probably start by learning the C language. This may help:
http://en.wikibooks.org/wiki/C_Programming
But a quick answer goes something like this:
A 'C' string like "gv" is an array of chars (or bytes to most machines)
so it may be declared and initialized thusly:
char string[] = "gv";
You can get to each byte by indexing the array:
char byte1 = string[0];
char byte2 = string[1];
So byte1 one will be 'g' and byte2 will be 'v', where the hex values
of those ASCII chars are 0x67 and 0x76 respectively (assuming I
interpreted the number conversions correctly from this):
http://www.asciitable.com/
The assignment works both ways of course so you can build up
a string like this (note that real C strings are defined to
be terminated with a null (0) character):
char newstring[3];
newstring[0] = 'g';
newstring[1] = 0x76;
newstring[2] = 0x00;
MS
Sikar Chan wrote:
Hello
I connected a CmuCAM3 to Tmote Sky via the UART0. I want to ask how to
convert a string like "gv" to bytes in order to send it to CmuCAM via
UART0.
Thanks a lot
Regards
Sikar Chan
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