I have trouble with in-system writing data to FLASH. I'm trying to use empty areas of single large FLASH (BRIGHT BM29F400B-90TC) for runtime data storage. Therefore, the same FLASH should be used for both code and data storage. My hardware is based on C164CI (internal ROM disabled) with 512k FLASH (0x00000/0x7FFFF) and 64k RAM (0x80000/0x8FFFF). Actually, that is C-Control-II unit from Conrad Electronic, and except for this problem it works just fine. As a programming tool I'm using Keil C166 Toolchain (latest update). I have tried what was recommended in Keil's APNT_138. That appnote was referred to C16x devices with on-chip FLASH, so I modified the system configuration and assembly language routines for FLASH erase and write according to C-Control-II requirements. After many attempts, it turned out that I couldn't erase nor write any of FLASH segments. I have no idea what to do further. If someone had the same or similar problem, or any experience in FLASH programming, please help! Best regards Miroslav
Make sure your flash programming code doesn't try to access flash area. This can happen because the compiler can insert library function calls (such as data type conversion routines) or there can be an interrupt and the interrupt vector table is in flash. Try writing your program step by step and verify that after each step you have working code. Best luck! - Mike