| ??? 01/10/11 12:07 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#180497 - instead of offsetting... Responding to: ???'s previous message |
Hello together,
I used the following construct for a port of CMON51 to my Phytec microMODUL-8051 with SDCC: /* memory mapped I/0 registers to control memory mapping for Phytec microMODUL-8051 */ #define PHYTEC_CTL1_REG (unsigned char xdata *)0xFC00 #define PHYTEC_CTL2_REG (unsigned char xdata *)0xFC01 #define PHYTEC_ADDR_REG (unsigned char xdata *)0xFC02 #define PHYTEC_MASK_REG (unsigned char xdata *)0xFC03 /* Configure Memory mapping (Phytec microMODUL-8051 specific): 0-7FFF CODE 8000-FFFF XRAM+CODE */ *PHYTEC_ADDR_REG=0x00; *PHYTEC_MASK_REG=0x7C; *PHYTEC_CTL1_REG=0x12; SDCC compiled this correctly and I think it is more readable than using a 0 pointer with offset. A volatile and a const behind the * might be helpful too. My 2 c, Matthias |
| Topic | Author | Date |
| sdcc internal error / C syntax | 01/01/70 00:00 | |
| legality of indexing NULL pointer | 01/01/70 00:00 | |
| bug | 01/01/70 00:00 | |
| version | 01/01/70 00:00 | |
| version revisited | 01/01/70 00:00 | |
| thank you | 01/01/70 00:00 | |
| Fixed | 01/01/70 00:00 | |
| no snapshot | 01/01/70 00:00 | |
| works | 01/01/70 00:00 | |
| 0 is special - but so is NULL. indexing around NULL is bad | 01/01/70 00:00 | |
| No guarantee that a NULL pointer points to any memory | 01/01/70 00:00 | |
| time | 01/01/70 00:00 | |
| I know :-( | 01/01/70 00:00 | |
| Use of __at ? | 01/01/70 00:00 | |
| What is "that way"? | 01/01/70 00:00 | |
| the antique version.... | 01/01/70 00:00 | |
| XBYTE macro | 01/01/70 00:00 | |
| Okay, then the following definition... | 01/01/70 00:00 | |
| RE: David's remarks about volatility | 01/01/70 00:00 | |
| Close, but no cigar | 01/01/70 00:00 | |
| Avoid the 'volatile' | 01/01/70 00:00 | |
| instead of offsetting... | 01/01/70 00:00 | |
| Dereferencing a '_REG | 01/01/70 00:00 | |
I agree | 01/01/70 00:00 | |
| Use of __at ? [ed] | 01/01/70 00:00 |