/ Technical Support GENERAL: CYGNAL DOWNLOAD VIA DLL AFFECTS CHECKSUM Information in this article applies to: • C51 All Versions • Cygnal DLL V1.2.4 QUESTION I'm working with Cygnal C8051F006 and my application calculates the flash checksum. Every time I download the same source code using Keil IDE ( via Cygnal DLL ), I get a different checksum value.

It appears that the flash download via Keil IDE does not fully erase the whole flash before the download. Is this correct? ANSWER Yes, the DLL does not erase all of the code space on each program download. This is by design. A download operation starts by reading the 512-byte flash sectors that contain an address included in the code image to be loaded.

It then modifies only the bytes at the addresses included in the code image. Then, only the flash sectors that were read are erased and reprogrammed. The net effect is that only bytes that are part of the new code image to be downloaded are changed.

Games For Ti 84 Plus Silver Edition. All other addresses retain their previous values -- even those in a re-programmed flash sector. This allows users to incrementally download code (e.g. Load a library of routines or boot loader to one location in code space and then, later, load additional application code to another location). To ensure all of the code space is erased before a download, you may use a stand-alone programming utility to erase code space or create a code image that uses every byte of code space, setting 'unused' bytes to 0xFF. SEE ALSO • Last Reviewed: Tuesday, April 20, 2004 Did this article provide the answer you needed?

The Flash Programming Utilities allow you to download your code to a device and perform other memory operations without needing to use the Silicon Labs IDE. These utilities are static examples of the C8051Fxxx On-Chip Interface Utilities DLL detailed in application note AN117. The downloaded installation utility installs. Development Release 2.8.99.97 Downloads. The Cygnal patches have now been forward-ported over the Cygwin 2.9.0 baseline, and appear in the new cygnal-2.9.0-branch. These are the cygnal-2.8.99.97 tagged development snapshots, built from the cygnal-2.9.0 branch.