| ??? 11/14/05 20:29 Read: times |
#103708 - Correct Responding to: ???'s previous message |
Ian Bell said:
I have had a quick look at the code and I think the problem could be in the spi code. You push 6 bytes onto the stack, then pop them off in a loop while transmitting spi - OK so far, pushes equal pops. I commented on this exact problem here: http://www.8052.com/forum/read.phtml?id=103690 . He's pushing data onto the stack, calling a routine to process it (send the data via SPI), but the SPI routine is actually popping the return address and sending it via SPI rather than the data... and he's then returning to a totally messed-up return address since the return address is no longer on the stack. Regards, Craig Steiner |
| Topic | Author | Date |
| Stack pointer causing code to loop? | 01/01/70 00:00 | |
| Try using a simulator | 01/01/70 00:00 | |
| declaring variables | 01/01/70 00:00 | |
| careful | 01/01/70 00:00 | |
| push and pull | 01/01/70 00:00 | |
| Correct | 01/01/70 00:00 | |
| ah.. so if I change... | 01/01/70 00:00 | |
| Uh, no | 01/01/70 00:00 | |
| in same sub | 01/01/70 00:00 | |
| Try a Ring Buffer | 01/01/70 00:00 | |
code changed so push/pops in same sub | 01/01/70 00:00 |