| ??? 02/08/06 19:57 Read: times |
#109553 - Keil example-- writing to 8051 mem---- Responding to: ???'s previous message |
I continue studying Keil examples. I found one (generic_memwrite) in which they write in every type of memoory using the following instruction:
/*--------------------------------------------------------- Fill idata_buffer with something. ---------------------------------------------------------*/ memcpy (idata_buffer, "IDATA Buffer....", sizeof (idata_buffer)); unsigned char idata idata_buffer [16] _at_ 0xB0; unsigned char data data_buffer [16] _at_ 0x60; unsigned char pdata pdata_buffer [16] _at_ 0xFF60; unsigned char xdata xdata_buffer [16] _at_ 0x0200; /*--------------------------------------------------------- Fill data_buffer with something. ---------------------------------------------------------*/ memcpy (data_buffer, "DATA Buffer......", sizeof (data_buffer)); /*--------------------------------------------------------- Fill pdata_buffer with something. ---------------------------------------------------------*/ memcpy (pdata_buffer, "PDATA Buffer -- NEVER USE :-)", sizeof (pdata_buffer)); /*--------------------------------------------------------- Fill xdata_buffer with something. ---------------------------------------------------------*/ memcpy (xdata_buffer, "XDATA Buffer....", sizeof (xdata_buffer)); QUESTION: is MEMCPY a keil function? or is it ANSI? In this example they do the following observation: "The example program writes stuff into memory ONLY for demonstration purposes. You should not use this method of writing into memory in structured, high-level programming languages." QUESTION: if thisway of writing works, whats wrong with using it? |
| Topic | Author | Date |
| storing serial data in memory | 01/01/70 00:00 | |
| after 100.000 writes it dies | 01/01/70 00:00 | |
| if internal memory is the problem | 01/01/70 00:00 | |
| Battery backed NVRAM from Dallas | 01/01/70 00:00 | |
| he seems not to need permanent storage | 01/01/70 00:00 | |
| not permanent storage | 01/01/70 00:00 | |
| if the problem is pin shortage | 01/01/70 00:00 | |
| PCR8750 | 01/01/70 00:00 | |
| Keil example-- writing to 8051 mem---- | 01/01/70 00:00 | |
| nope | 01/01/70 00:00 | |
| Not quite... | 01/01/70 00:00 | |
| memcpy() | 01/01/70 00:00 | |
| yes, ANSI, but not really '51 | 01/01/70 00:00 | |
| Rubbish! | 01/01/70 00:00 | |
| Rubbish? I said "on the edge" | 01/01/70 00:00 | |
| Not quite... | 01/01/70 00:00 | |
| Very clever | 01/01/70 00:00 | |
| indeed, if you have the time | 01/01/70 00:00 | |
| Do you know that? | 01/01/70 00:00 | |
| there is a large advantage when reading | 01/01/70 00:00 | |
| 1 - 4 byte types supported | 01/01/70 00:00 | |
| example link | 01/01/70 00:00 | |
| Demo only | 01/01/70 00:00 | |
| Grrr | 01/01/70 00:00 | |
i think this got a bit off track | 01/01/70 00:00 |