On Tue, 2013-03-19 at 09:08 -0700, yamanoor sairam wrote:
> I am trying to transfer 256 bytes of at data 1M baud rate from my PC to a=
n Atmega328 microcontroller. I am using checksum to verify the integrity of=
 the data and I am emptying the received data into a ring buffer as quickly=
 as possible. This is all I have in my interrupt subroutine:
> temp =3D UDR0;
> BufferWrite(&rx_buffer,&temp);=20
> The data is transferred properly only at speeds upto 250K baud rate. It r=
esults in error beyond that point. The Atmega 328 datasheet specifies that =
it possible to transfer at speeds upto 2M baud rate. The ring buffer size i=
s about 400 bytes and I am looking for some suggestions to achieve higher b=
aud rates while maintaining the data integrity.

Are you trying to do this over RS232? If so I don't think you'll be able
to get it to work, 250k is about as fast as you should expect RS232 to
go.

I believe you need a different interface to the PC if you really need
1Mbps speeds.

TTYL

--=20
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