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Discussion Groups | AT91SAM ARM | Performance of AT91SAM7S64 usb port
For users of the Atmel AT91SAM7 and AT91SAM9 ARM CPU chips. Atmel has taken a new direction by combining on chip flash and ram with the ARM CPU on a single die. This provides low cost devices for small systems using the ARM CPU. This group is to exchange information to help users get started and learn how to use the devices.
Performance of AT91SAM7S64 usb port - Yanjun Luo - Feb 14 13:11:34 2008
Hi,
I'm running usb-device-cdc-serial-project-1.2-at91sam7s-ek
on my board, the performance is very low, far away from
1MByte/S, as datasheet said.
I guess maybe problem is the code call CDCDSerialDriver_Read
in main loop, and this is not running fast enough?
So there are another problem, I'm using yagarto-tools, which
is arm-elf-gcc and Eclipse, how can I chang Makefile or link
script to make function main() running in sram?
Regards,
Yanjun Luo.
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
I'm running usb-device-cdc-serial-project-1.2-at91sam7s-ek
on my board, the performance is very low, far away from
1MByte/S, as datasheet said.
I guess maybe problem is the code call CDCDSerialDriver_Read
in main loop, and this is not running fast enough?
So there are another problem, I'm using yagarto-tools, which
is arm-elf-gcc and Eclipse, how can I chang Makefile or link
script to make function main() running in sram?
Regards,
Yanjun Luo.
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
Re: Performance of AT91SAM7S64 usb port - Yanjun Luo - Feb 14 13:48:30 2008
Hi,
Thanks for your reply, it's really a bad news for me:-(
I'll try to find a best result.
Regards,
Yanjun Luo.
----- Original Message -----
From: Foltos
To: A...@yahoogroups.com
Sent: Thursday, February 14, 2008 10:33 PM
Subject: Re: [AT91SAM] Performance of AT91SAM7S64 usb port
Hi,
the latency of USB is very high (1 mS). Don't expect to get high speed if
you transfer a lot of small data chunks.
Foltos
Yanjun Luo wrote:
Hi,
I'm running usb-device-cdc-serial-project-1.2-at91sam7s-ek
on my board, the performance is very low, far away from
1MByte/S, as datasheet said.
I guess maybe problem is the code call CDCDSerialDriver_Read
in main loop, and this is not running fast enough?
So there are another problem, I'm using yagarto-tools, which
is arm-elf-gcc and Eclipse, how can I chang Makefile or link
script to make function main() running in sram?
Regards,
Yanjun Luo.
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
Thanks for your reply, it's really a bad news for me:-(
I'll try to find a best result.
Regards,
Yanjun Luo.
----- Original Message -----
From: Foltos
To: A...@yahoogroups.com
Sent: Thursday, February 14, 2008 10:33 PM
Subject: Re: [AT91SAM] Performance of AT91SAM7S64 usb port
Hi,
the latency of USB is very high (1 mS). Don't expect to get high speed if
you transfer a lot of small data chunks.
Foltos
Yanjun Luo wrote:
Hi,
I'm running usb-device-cdc-serial-project-1.2-at91sam7s-ek
on my board, the performance is very low, far away from
1MByte/S, as datasheet said.
I guess maybe problem is the code call CDCDSerialDriver_Read
in main loop, and this is not running fast enough?
So there are another problem, I'm using yagarto-tools, which
is arm-elf-gcc and Eclipse, how can I chang Makefile or link
script to make function main() running in sram?
Regards,
Yanjun Luo.
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
Re: Performance of AT91SAM7S64 usb port - Foltos - Feb 15 7:05:25 2008
Hi,
the latency of USB is very high (1 mS). Don't expect to get high speed
if you transfer a lot of small data chunks.
Foltos
Yanjun Luo wrote:
>
> Hi,
> I'm running usb-device-cdc-serial-project-1.2-at91sam7s-ek
> on my board, the performance is very low, far away from
> 1MByte/S, as datasheet said.
> I guess maybe problem is the code call CDCDSerialDriver_Read
> in main loop, and this is not running fast enough?
>
> So there are another problem, I'm using yagarto-tools, which
> is arm-elf-gcc and Eclipse, how can I chang Makefile or link
> script to make function main() running in sram?
>
> Regards,
> Yanjun Luo.
>
>
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
the latency of USB is very high (1 mS). Don't expect to get high speed
if you transfer a lot of small data chunks.
Foltos
Yanjun Luo wrote:
>
> Hi,
> I'm running usb-device-cdc-serial-project-1.2-at91sam7s-ek
> on my board, the performance is very low, far away from
> 1MByte/S, as datasheet said.
> I guess maybe problem is the code call CDCDSerialDriver_Read
> in main loop, and this is not running fast enough?
>
> So there are another problem, I'm using yagarto-tools, which
> is arm-elf-gcc and Eclipse, how can I chang Makefile or link
> script to make function main() running in sram?
>
> Regards,
> Yanjun Luo.
>
>
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )