topic Re: low performance in MQX SPI driver in MQX Software Solutions

low performance in MQX SPI driver

bugs — Fri, 22 Jul 2011 04:03:22 GMT

In poll mode t takes 2.2us to send one character in 12MHz baudrate.

In interrupt mode t takes 4.0us to send one character in 12MHz baudrate.

I checked the poll mode driver, it calls _dspi_polled_tx_rx() for every character it sends, and it also wait for the read back in this function.

The driver doesn't take the advantage of FIFO

Microfelix — Wed, 05 Oct 2011 22:42:45 GMT

I have the same problem.
It 'been resolved?

maurizio

DavidS — Thu, 06 Oct 2011 20:22:03 GMT

Hi Mircofelix,

Our MQX development team is working to improve the driver performance and an update is expected in our MQX3.8 release mid next month.

Regards,

David

MarkP_ — Fri, 07 Oct 2011 00:19:16 GMT

Hi,

Have you tried the processor expert driver code?

I first tried I2C with MQX driver, it jammed. Then changed to P&E code (for K60/K10), works fine.

The driver functions are in one (generated) file, easy to check what's happening.

~Mark