Evert Lammerts wrote:
> Hi,
>
> I have two kernel modules, one for sending and one for recieving, on two
> different machines. The two interesting functions, after creating the
> sockets and connecting to them, are basically:
>
> static void recieve(void *arg)
> {
> int retval;
> char packet[sizeof(float)];
>
> retval = rt_dev_recv(sockfd, packet, sizeof(packet), 0);
>
> *((hal_float_t *)hal_data->hfloat) = *((float *)packet);
> }
>
> static void send(void *arg, long period)
> {
> int retval;
>
> char packet[] = "2.9";Looks to me like you are sending the *string* "2.9" here, no? > > retval = rt_dev_send(sockfd, packet, sizeof(packet), 0); > } > > In recieve, hal_float_t is a volatile float. > > First off, is it true that I can only send a char array? Or could I send > over a float directely? You can do this, or you can wrap some structure around it, or... The only thing you have to care for is if do both machines store float identically in memory: number and meaning of bits, byte order (big/little endian). > > If I now monitor the value of hal_data->hal_float, I get a strange value. > I know I'm doing something wrong here on programming level, probably in > casting. Any idea what that might be? > > Thanks a bunch, > Evert > > Jan
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