Hi Bruno,
Thanks a lot of your suggestions. Unfortunately I have incorrect results . Please try to test some modifications in FLASH_ByteReadWriteOperation example:
/* Define FLASH programming time */
FLASH_SetProgrammingTime(FLASH_PROGRAMTIME_STANDARD);
/* Unlock Data memory */
FLASH_Unlock(FLASH_MEMTYPE_PROG);
/* Read a byte at a specified address */
add = 0xFFFF;
FLASH_ProgramByte(add , 44); - this line produces good results
val = FLASH_ReadByte(add);
add = 0x10000;
FLASH_ProgramByte(add , 44); - no results
val = FLASH_ReadByte(add);
add = 0x20000;
FLASH_ProgramByte(add , 44); - no results
val = FLASH_ReadByte(add);
add = 0x27000;
FLASH_ProgramByte(add , 44); - no results
val = FLASH_ReadByte(add);

Additionally I switch options:
• #define RAM_EXECUTION (1)
• Program model (project options) STM8LargeROM/STM8SmallROM
But without result.
Only
add = 0xFFFF;
FLASH_ProgramByte(add , 44);
Works ok
How do I test:
1 step
Compilation, download to flash, reset, reset, upload from flash to file.
2 step
Comment:
/*
add = 0xFFFF;
FLASH_ProgramByte(add , 44); - this line produces good results
val = FLASH_ReadByte(add);
add = 0x10000;
FLASH_ProgramByte(add , 44); - no results
val = FLASH_ReadByte(add);
add = 0x20000;
FLASH_ProgramByte(add , 44); - no results
val = FLASH_ReadByte(add);
add = 0x27000;
FLASH_ProgramByte(add , 44); - no results
val = FLASH_ReadByte(add);
*/
Compilation, download to flash, reset, reset, upload from flash to file
3 step
comparison.
Best Regards,
Marcin Wijata

Hi Marcin,

We reproduced the problem in our Labs.
The problem comes from the fact that in the FLASH_ProgramByte() function, the "PointerAttr" qualifier should be applied to pointers and not to the value.

The solution is to correct the ST library the following way:

void FLASH_EraseByte(uint32_t Address)
{
    /* Check parameter */
    assert_param(IS_FLASH_ADDRESS_OK(Address));
    
    /* Erase byte */
   *(PointerAttr uint8_t*) (uint16_t)Address = FLASH_CLEAR_BYTE; // WILL NOT WORK! qualifier is forgotten
   *(uint8_t PointerAttr*) (uint16_t)Address = FLASH_CLEAR_BYTE; // Works fine. PointerAttr is replaced by "far" on STM8S208
}

*ALL* the functions from the library that use the PointerAttr qualifier should be rewritten as above.
Note that this limitation should be corrected in a future release of RKit-STM8, so that both syntaxes will be supported.

Best Regards,

Hi Bruno,
Thanks a lot of your help. The problem is solved.
Best regards
Marcin

Hi All,
I was working on this problem all day on an STM8S, and while I did end up needing to do the change mentioned in this thread, with:

FLASH_ProgramByte(0x12345, 0xAB);
val = FLASH_ReadByte(0x12345);

//////////////

void FLASH_ProgramByte(u32 Address, u8 Data)
{
assert_param(IS_FLASH_ADDRESS_OK(Address));
*(u8 PointerAttr*) (u16)Address = Data;
}

I did not get the correct "val", while:

void FLASH_ProgramByte(u32 Address, u8 Data)
{
assert_param(IS_FLASH_ADDRESS_OK(Address));
*(u8 PointerAttr*) (u32)Address = Data;
}

did give me the correct "val".

I tried this with different addresses over 0xFFFF and only the u16->u32 change gives me the correct value while running on the physical chip. I'm not too familiar with using these Near and Far addresses, but I have my compiler set to STM8S Large Rom, and my u8, u16, u32 types are identical to the ones in the the ST libraries.

Hope this helps.