| ??? 11/04/07 05:49 Modified: 11/04/07 06:11 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#146565 - The table and function pointer Responding to: ???'s previous message |
After that, there would be a DATA segment too large C249 error in the CRC lookup table and what appears to be the receive buffer. Assign the CRC table to the code space, using "code" memory specifier. Then it has trouble with the function pointers struggling with trying to put function parameters on the stack (or the lack of one, I should say). The function pointer causes problem because KEIL fails to makeup right call tree. Then, KEIL fails to overlay RAM for the parameters and working RAM of the functions. It's too difficult for the current level of compilers, to interpret how the source code works, instead of how the source code is written. When you provide proper linker directive to correct the call tree, no need to rewrite the code for the function pointer. See this KEIL KB article. "C51: PROBLEMS WITH FUNCTION POINTERS OVERWRITING VARIABLES" http://www.keil.com/support/docs/210.htm Tsuneo |
| Topic | Author | Date |
| Porting FreeModbus | 01/01/70 00:00 | |
| they are not | 01/01/70 00:00 | |
| Is this even feasible | 01/01/70 00:00 | |
| compiler warnings | 01/01/70 00:00 | |
| The table and function pointer | 01/01/70 00:00 | |
More on function pointers in Keil C51 | 01/01/70 00:00 | |
| more porting to do | 01/01/70 00:00 | |
| You mean linker | 01/01/70 00:00 |