Forum Discussion
Occasional ContributorNios-V alt_epcq_controller_write() Problem
Hi Balerion,
Regading to avl_mem slave:
If you also place avl_mem slave in Peripheral Region, you can use the current altera_epcq_controller.c file as is.
However, you may want to place avl_mem slave in cacheable (non-Peripheral) region to take advantage of the cache for read accesses. In that case, cache maintenance needed for flash memory write operation in Nios V/g system. Here is a code example (= not fully validated) to achieve this attached (please replace the file extension from ".txt" to ".c"). At the end of the alt_epcq_controller_write_block() function, cache flush function call and error checking are added.
Thanks,
ShoH
Occasional ContributorHi ShoH,
Before I try what you suggest I did another thing which is I used to call Public API's in order like:
For write operation:
alt_epcq_controller_lock(); // with related params to unlock all sectors
alt_epcq_controller_write(); // with related params to erase and write
alt_epcq_controller_lock(); // with related params to lock all sectors
I was doing that for every write operation.
then what I did is when initializing I'm opening the lock of all sector once then don't deal with any locking:
alt_epcq_controller_lock(); // with related params to unlock all sectors
SleepMs(20);
For Write operation:
alt_epcq_controller_write(); // with related params to erase and write
It seems, this solved my problem. I did some tests like writing and reading different size of data and comparing them none of them failed.
Thanks for help,
Balerion
Occasional ContributorHi Balerion,
In any case, it is highly recommended to use non-cached access to Peripherals in order to ensure reliable and stable access to Peripherals.
Thanks,
ShoH
