Write your interrupt handler in assembly language!

-- Bob Ammerman
RAm Systems
=20

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
yamanoor sairam
Sent: Tuesday, March 19, 2013 12:08 PM
To: Microcontroller discussion list - Public.
Subject: [EE]: Transferring large chunks of data at higher baud rates

I am trying to transfer 256 bytes of at data 1M baud rate from my PC to an
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);
The data is transferred properly only at speeds upto 250K baud rate. It
results 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 bau=
d
rates while maintaining the data integrity.
Sai
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