Programming

I didn't mean "check for available bytes instead" when I said "no timeouts".

You are getting data every 50 milliseconds. There's no point trying to time it carefully. The timer resolution of the OS itself will make it jitter.

Just read(), only read(), and nothing but read().

If even that doesn't work, there's something wrong with your connection or data...

Corona, my function also work with IOCTL and timer every 10 ms..

I can also try your method but in a while(1){ }? you can write your code pls?

thanks

"doesn't work with ioctl" is what you meant, I believe, since if it were working you wouldn't need our help...

I asked before and ask again, is this actually RS-232? If it plugs into USB, the answer is probably no. And if the answer is no, the usual serial niceties like flow control probably aren't going to work how you want, making a lot of fancy termios things pointless.

Code:

unsigned char buf[1000], checksum;
int pos=0;

unsigned char c=0;

while(1)
{
        if(read(fd, &c, 1) <= 0) break;
        buf[pos++]=c;
        if(c == 'm') break;
}

if(c == 'm') read(fd, &checksum, 1);

// Calculate checksum, discard if bad, accept if good

Yes is RS232.