USB with graphical interface with IMXRT1062

[marcellocampani]

Good morning everyone

I'm using the mimxrt1060-evk

I need to integrate usb host functionality in a design with graphical interface.

To do this I mixed the examples "emwin slide show" and the host_msd_fafts_bm.‌

Because of the memory needed by emwin I need to use the external SDRAM for data.

With this configuration the usb example doesn't work.

To isolate the problem I tried simply to change the memory used by the usb example alone from the default SRAM_DTC to board_sdram moving up this latter to the first position in memory configuration. With this memory configuration the usb example doesn't work anymore. Any suggestion?

Thank you in advance for collaboration.

[jackking]

I have a similar question outstanding for both USB host examples and FatFS...  so far the only resolution was to place the entire Heap and Stack into a noncached memory section. 

I would love to know which control structures for FatFS and USB Host need to explicitly reside in non-cached memory.

[marcellocampani]

Hello Mr. King

How did you place the heap and stack in noncached memory? I tried with these settings but the program crashes..

Thank you for collaboration.

Best regards

[jackking]

Sorry, it should be the Global Data placement:

[marcellocampani]

Hello Mr. King

With global data placement in SRAM_DTC you put ALL the data in that section. the usb works but the emwin graphical interface overflows. Are you using the graphical interface with usb?

Best regards

[jackking]

Sorry, I'm not using emWin, but are you able to place the frame buffer used by emWin into a different memory segment explicitly? 

[marcellocampani]

I placed the frame buffer in external SDRAM and now it works correctly.

Thank you for collaboration.