GDI4: configuration persistence is flaky

[rusefillc]

See 97b1435

I have configuration update counter logged into UART console

at the moment rusEFI requests calibration modifications via CAN bus and I see counter going up

problem: on "reset" too often I see values roll back to previous configuration in 80% of the cases

8000 10 HAPPY
here 10 is configuration version.

[rusefillc]

shit I have GD32F103CBT6 C77979 chip

https://lists.gnupg.org/pipermail/gnuk-users/2018-March/000021.html

1. Because the property of the underlying flash technology by GigaDevice,
   the first 32 KiB of the flash is zero-wait for reading, but the writing and
   erasing of the chip is significantly much more longer than STM32, as a
   result, the programming software needs some modifications.

The official application notes recommends:

i)  increase the erase timeout per page to 300ms,
    increase the mass erase timeout to 3s.

ii) increase the program time per word to 2ms,
    increase the program time per page to 300ms.

tried with
#define STM32_FLASH_WAIT_TIME_MS 300

but that did not help

[rusefillc]

GD32 and STM32 Compatibility
https://easyelectronics.ru/img/ARM_kurs/STvsGD/Migration/compatibility%20sumup%20between%20GD32%20and%20STM32_V2.0.pdf

[rusefillc]

test project works same good on both stm32 and GD32 - now I am confused, that must be some silly error specifically in GDI4 firmware?

rusefi/rusefi@47d9642
rusefi/rusefi@19e032f

[rusefillc]

@dron0gus actually NO, looks like different behavior between stm32 and GD32. Do you have GDf103 and stm32f103 handy?

[rusefillc]

@dron0gus actually I got even stm32 to not behave as I expect - just much much less often

expected behavior: UART shows incrementing counter, counter is persisted with reset/power cycle

actual behavior: stm32 would rarely reset counter to zero, gd32 would often reset to zero. neither chip gives me reliable persistent counter

[rusefillc]

stm32

0.000   writes=1077     reboots=317

0.000   writes=1078     reboots=317

0.000   writes=1079     reboots=317

0.000   writes=1080     reboots=317

0.000   writes=1081     reboots=317

0.000   writes=1082     reboots=317

0.000   writes=1083     reboots=317

[rusefillc]

gd32

0.000   writes=2        reboots=0

0.000   writes=3        reboots=0

▒0.001  writes=0        reboots=0

▒0.001  writes=0        reboots=0

0.000   writes=1        reboots=0

▒0.001  writes=0        reboots=0

▒0.001  writes=0        reboots=0

▒0.001  writes=0        reboots=0

0.000   writes=1        reboots=0

0.000   writes=2        reboots=0

0.000   writes=3        reboots=0

0.000   writes=4        reboots=0