Recognising a received uart character

RE: Recognising a received uart character

awneil — Wed, 16 Mar 2016 11:18:10 GMT

State Machines can be helpful for parsing ...

RE: Recognising a received uart character

Wojtek — Wed, 16 Mar 2016 11:06:05 GMT

For parsing purpose there are different approaches - you can look for unique patterns (ex. + at the beginning of every message), fixed length etc.

RE: Recognising a received uart character

Sensors — Wed, 16 Mar 2016 10:58:29 GMT

Yes. Yes I did. I almost never deal with strings in C, I didn't know that made a difference. Thanks Can you make a note in your original answer pointing that out and I'll mark it as accepted.

RE: Recognising a received uart character

Wojtek — Wed, 16 Mar 2016 10:56:04 GMT

Didn't you confuse '+' with "+" ?

RE: Recognising a received uart character

Sensors — Wed, 16 Mar 2016 10:52:41 GMT

Wojtek, I did exactly what you told me to do. Only way I can get it to work is if I define test as an array. The error is from the compiler, but the IDE gives me a warning saying I cannot initialise a type char with a type char[2].

RE: Recognising a received uart character

Sensors — Wed, 16 Mar 2016 10:50:05 GMT

The second part of my questions is a lot to do with the nordic SDK. I'm not really sure where/how I should parse the whole string. This string is of the form: $FMS1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, and I want to extract the first value out of it.

How do I manage the UART/FIFO to help me do this?

RE: Recognising a received uart character

Wojtek — Wed, 16 Mar 2016 10:49:53 GMT

It gives you error because you did not do what I suggested :] and just like awneil said - its just c basics - you have to learn them.

RE: Recognising a received uart character

Wojtek — Wed, 16 Mar 2016 10:47:55 GMT

Also, debugger is really easy to solve that kind of problems if you are confused with casts...

RE: Recognising a received uart character

Sensors — Wed, 16 Mar 2016 10:47:39 GMT

error: #144: a value of type "char *" cannot be used to initialize an entity of type "char"

RE: Recognising a received uart character

awneil — Wed, 16 Mar 2016 10:46:10 GMT

Note that this is standard 'C' stuff - nothing specifically to do with Nordic.

Here are some 'C' learning references & resources: blog.antronics.co.uk/.../

RE: Recognising a received uart character

Wojtek — Wed, 16 Mar 2016 10:38:34 GMT

You get l instead of + because you are comparing buffer[0] with pointer (casted to unsigned char), not with char. Just change: char * test = "+"; to char test = '+';

Note that "+" is not the same as '+' :)