EEPROM Use Error in Byte access

ETRO_SSN583 · ‎Sep 09, 2020

Doing the following -

#define CYDEV_EE_BASE 0x40008000u // This is Creator generated

uint8 nSavedEE = 0;

I get a warning on line 420, but does not show up in warnings notice window after compile., Still stays however

when doing further code work. Warning shown below.

Regards, Dana.

NoriTan · ‎Sep 10, 2020

Dana,

At first, the compiler converted the 32-bit (unsigned int) value 0x40008000 (1073774592) into a 16-bit (unsigned short) value 0x8000 (32768) to pass the value to the function EEPROM_ReadByte() as the argument.

The function receives a 16-bit value 0x8000 (32768) and calculates the actual address as following statement.

    retByte = *((reg8 *) (CYDEV_EE_BASE + address));

So, the returned value will be read from 0x40010000 which is a "Digital interconnect configuration" register area.

I don't know why you think the program is working fine.

But this is an incorrect use of EEPROM_ReadByte() function.

Anyway, EEPROM_WriteByte() function has a protection not to access an invalid address. So, the "Digital interconnect configuration" are will not be destroyed.

Regards,

Noriaki

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EEPROM Use Error in Byte access

EEPROM Use Error in Byte access

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