Hello jeremyzhou
The project i am using is evkmimxrt1064_Emwin_emwin_gui_demo.
I have changed the following code for backlight to make it work on my prototype board.
emwin_support.h
main.c (commented i2c init as not used in our prototype board)
I also observed that with the below configuration the program sometimes crashes
NCACHE_REGION BOARD_SDRAM LCD_BITS_PER_PIXEL Debug
2 MB 30 MB 32 success
To resolve this i comment the lines related to multi buffer begin and end.
The project is attached for your reference.
Thanks
Regards,
Anuj
Hi Anuj Tanksali ,
Thanks for your reply.
First, I've not encountered the crash error after modifying the code as you introduced.
Secondly, Fig 1 presents the memory allocation, it divides the external SDRAM into two parts.
However, in the BOARD_ConfigMPU() function, it doesn't have the attribute configuration of the NCACHE_REGION, so it should add the below code in the BOARD_ConfigMPU() function.
/* Region 8 setting, set last 2MB of SDRAM can't be accessed by cache, glocal variables which are not expected to be
* accessed by cache can be put here */
/* Memory with Normal type, not shareable, non-cacheable */
MPU->RBAR = ARM_MPU_RBAR(8, 0x81E00000U);
MPU->RASR = ARM_MPU_RASR(0, ARM_MPU_AP_FULL, 1, 0, 0, 0, 0, ARM_MPU_REGION_SIZE_2MB);
Next, there's no ideal proportion of the BOARD_SDRAM and NCACHE_REGION memory areas actually, it should be determined by the exact demo project.
TIC
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Hello jeremyzhou
My memory configuration is
and as per my memory configuration the changes in MPU init code are below,
my program when debugged crashes. LCD blinks 2-3 times before crashing.
I debugged the program and found out issue is with mutibuffer. if i comment out code as shown below then program runs fine
What could be the reason for this?
Thanks
Regards
Anuj
Hello jeremyzhou
Thanks for your reply.
I observed that the code somehow works on the iMXRT1064 EVK board but having the above issue only on my prototype board.
The differences that i observed between the two are
1) EVK board uses internal power supply DCDC but prototype board does not.
2) The LCD pins are connected as below in prototype board,
as you can see GPIO_B0_15 is left out. but i think this should not cause an issue.
On EVK board this pin is used.
Could any of the above options cause an issue?
Regards,
Anuj
