| ??? 07/09/07 09:25 Read: times |
#141595 - Look at the Map file! Responding to: ???'s previous message |
John Hu said:
when I tried to declare a new variable
unsigned char data testfd6; the address space overflows how come? Because it's full - that's what "overflow" means! idata works fine Presumably, you're using a chip that has more IDATA than DATA? (ie 8052-like rather than 8051-like). I know idata is the whole 256 byte space
and data is the first 128 byte of memory space Note that this is not just any "memory space" it is specifically the Internal RAM spaces within the 8052 core - not to be confused with CODE or XDATA, which are entirely distinct address spaces, even though the physical memory may be on-chip. and there is obviously space(gap) in the first 128byte of memory space Is there? Don't forget that the Register Banks are in DATA space... can someone help??? You need to specifically state what chip you're using, and what tools. It looks like Keil - is it?
* * * * * * * D A T A M E M O R Y * * * * * *
REG 0000H 0008H ABSOLUTE "REG BANK "
DATA 0008H 0014H UNIT DATA_GROUP_
001CH 0004H *** GAP ***
DATA 0020H 0008H BIT_ADDR ?BA?XXACT_H
BIT 0028H.0 0000H.1 UNIT _BIT_GROUP_
0028H.1 0000H.7 *** GAP ***
IDATA 0029H 000FH UNIT ?ID?XXACT_H
0038H 0030H *** GAP ***
Note that you need to use the same tags to preserve this text layout as for code layout - see http://www.8052.com/faqs.phtml?FAQ=120199 You need to look at the Linker Listing file - or "Map" File - to see what is actually using-up all your DATA space... |
| Topic | Author | Date |
| data declaration problem | 01/01/70 00:00 | |
| Look at the Map file! | 01/01/70 00:00 | |
| hmm... how? | 01/01/70 00:00 | |
| Think about it - nothing weird! | 01/01/70 00:00 | |
| So why did they do that? | 01/01/70 00:00 | |
| thanks andy~ | 01/01/70 00:00 | |
| advice on the usage of absolute addresses | 01/01/70 00:00 | |
| so how do i check? | 01/01/70 00:00 | |
| It should be documented! | 01/01/70 00:00 | |
| i see | 01/01/70 00:00 | |
| incomplete | 01/01/70 00:00 | |
| Pay attention! | 01/01/70 00:00 | |
| to what? | 01/01/70 00:00 | |
| Jojo's back | 01/01/70 00:00 | |
| please read the content in that link | 01/01/70 00:00 | |
| gaps | 01/01/70 00:00 | |
| ya... | 01/01/70 00:00 | |
| read my post above ... | 01/01/70 00:00 | |
| I got it now | 01/01/70 00:00 | |
How to make a gap | 01/01/70 00:00 | |
| Not a declaration problem! | 01/01/70 00:00 |