ChibiOS Free Embedded RTOS

Dear Kristoffer,

This thread is too old but I would like to test your DW1000 driver under latest ChibiOS.

Could you give me a permission to use your driver for DW1000: https://gitlab.com/totalkrill/dw1000-driver
and the whole project from GitLab: https://gitlab.com/totalkrill/fresknode/tree/master

Thank you in advance
Chris

I have already do that in my previous post. You can download it following the link:
http://forum.chibios.org/phpbb/download/file.php?id=933

Regards
Chris

I try it increasing USBEndpointConfig.in_multiplier for USB FS/HS data endpoints only from 2 (default) to 4 and 8.
In both cases (4 and 8) USB HS throughput increases from ~5 to ~7.4 MBps when connected to Linux on a20-Lime2-SOM.
When USB HS was connected to i7 PC with Windows 7 throughput increases ...

Hi to All,

I have made some more tests with different buffer sizes and would like to update preliminary figures.
Unfortunately, when buffer size was set to 16 kB or more the following linker error is observed:

Linking build/ch.elf
rules.ld:359 cannot move location counter backwards ...

Hi Giovanni,

How much would you estimate the advantage of the new system compared to normal queues?
As I can see in preliminary tests performance is increased at:
* USB FS from ~585 to ~958 kBps or with more than 60% (close to one measured with stm32cube implementation - ~1048 kBps),
* USB HS ...

Increasing buffers size to 1k performs slightly better:

SDU2 Throughput [kBps] vs time [sec] @ 1024 buffer size:
cur max min avg
75 4659.2 6927.3 4622.8 4683.5

Unfortunately, my tests with stm32cube show the best results at 36kB transmit buffer size.
At 1k ...

Adding condition to fill the buffers only once did not influence performance at all.

(void) obqGetEmptyBufferTimeout(&SDU2.obqueue, TIME_INFINITE);
if (cn < 2) memcpy(SDU2&#46;obqueue&#46;ptr, buf, SERIAL_USB_BUFFERS_SIZE);
obqPostFullBuffer(&SDU2&#46;obqueue, SERIAL_USB_BUFFERS_SIZE ...

Hi Giovanni,

I have just run brief tests with almost no changes against chibios-svn-8631-trunk.
The following implementation is used as a test basis (see more in btest-2.zip):

static uint8_t buf&#91;&#93; = "0123456789abcdef0123456789abcdef&#46;&#46;&#46;"; // 1024 buffer
count ...

Thanks Giovanni,

I will update my performance test application, perform new assessment and post new figures as soon as have them.

Best regards
Chris

Hi Giovanni,

It is good news.Proposed solution is very interesting because it can be applied at other cases as well.
It will be big advantage if both linear and circular buffers can be supported in the new object.

I am ready to help in testing and assessment phases of the implementation so please ...