| ??? 11/01/07 09:40 Read: times |
#146442 - Overcomplicated? Responding to: ???'s previous message |
Joe Gold said:
Compare your header file with the Keil one here
http://www.keil.com/dd/docs/c51/philips/reg952.h You will note how the S1BUF (S1ADDR) is mapped in to external memory. Looking at that file: Keil's reg952.h said:
/* Serial 1 Configuration */ #define S1ADDR (*((unsigned char volatile xdata*)0xFFB2)) #define S1ADEN (*((unsigned char volatile xdata*)0xFFB1)) #define S1BUF (*((unsigned char volatile xdata*)0xFFB0)) Looks like a particularly clumsy way of doing it! As we are talking specifically about Keil, I'd have thought it would make much more sense to write: unsigned char volatile xdata S1ADDR _at_ 0xFFB2; unsigned char volatile xdata S1ADEN _at_ 0xFFB1; unsigned char volatile xdata S1BUF _at_ 0xFFB0; Which would have the added advantages of giving you proper 'C' language (and debugger) symbols, and informing the Linker that these addresses are not available for general use? Discuss. |
| Topic | Author | Date |
| UART1 problem in P89LPC952 | 01/01/70 00:00 | |
| What ? | 01/01/70 00:00 | |
| Compare with other examples | 01/01/70 00:00 | |
| Compare with other examples ... and | 01/01/70 00:00 | |
| Re: Compare with other examples | 01/01/70 00:00 | |
| now you have two | 01/01/70 00:00 | |
| Don't trust anything | 01/01/70 00:00 | |
| Re:Don't trust anything | 01/01/70 00:00 | |
| its working | 01/01/70 00:00 | |
| how? | 01/01/70 00:00 | |
| Re:how? | 01/01/70 00:00 | |
| Yep : Don\'t trust anything! | 01/01/70 00:00 | |
| Whose header? | 01/01/70 00:00 | |
Re:Whose header? | 01/01/70 00:00 | |
| MCB950 board is working | 01/01/70 00:00 | |
| UART1 S1BUF doesn't use std SFR | 01/01/70 00:00 | |
| Check the header file | 01/01/70 00:00 | |
| Re:Check the header file | 01/01/70 00:00 | |
| Overcomplicated? | 01/01/70 00:00 |