Re: [ECOS] read from user port

[Harri Siirtola <harri dot siirtola at vtt dot fi>]

On Mon, 2003-03-10 at 17:40, Katerina Malatara wrote:
> hi,
> i work with a e7t board and i try to read from user port. I have connect 
the
> user port with com2 of my PC.
> The PC read some data from a file store them in a buffer and then it send
> them  through serial port to the board. The board must receive the data and
> response by sending some other data.
>
> I use baudrate 38400.
>
> The PC use this function in a loop in order to send all the data in the
> buffer
> void outbyte(int fd, char c)
> {
> 	int n;
>
> 	n = write(fd, &c, 1);
> 	if (n < 1) {
> 		printf("Error %d: Can't write to serial port\n",n);
> 		return;
> 	}
> }
>
> And board use the function
> char inbyte(cyg_io_handle_t handle)
> {
> 	char temp[1];
> 	Cyg_ErrNo n;
> 	cyg_uint32 len = 1;
>
> 	n = cyg_io_read(handle, temp, &len);
> 	if(n != ENOERR) {
> 		diag_printf("Error %d: Can't write to serial port\n",n);
> 		exit();
> 	}
> 	return (temp[0]);
> }
>
> but receive only the last character.
>
> I can't understand where is the problem.

Do you use the receive function in a loop as well? Or do you have an ISR to 
empty the receive buffer? If all you get is the last char I suspect you 
don't read all chars (or you may store every incoming char to the same 
location).

	Harri


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