Hi again,
This is actually standard C. TOS_Msg is probably a data structure that
defines data
packets sent over the radio links (look for .h files that define it).
The data field in it
is probably defined as uint8_t array, so in effect points to the first
element in the array.
If you want to send/receive data, it is much easier for you to do this
with your own
data structure, hence the IntMsg. You just say that you have a pointer
to your data
structure and that it should point to the memory of the data portion of
the radio message.
Cheers,
Urs
Renee Azhen wrote:
> dear all:
> In many examples exist this code:
> IntMsg *message = (IntMsg *)data.data;
>
> I am so puzzled here:
> here is the definition of data and IntMsg:
> TOS_Msg data;
> typedef struct IntMsg {
> uint16_t val;
> uint16_t src;
> } IntMsg;
>
> It is so differnet from C code.
> They are different kink data struct, how to convert a TOS_Msg to an IntMsg??
> Could you help me to make it clear?
> thanks and Best regards
> Sam
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