| ??? 01/07/09 10:05 Read: times |
#161351 - Using bit masks. Responding to: ???'s previous message |
Munish Kumar said:
3. I didnt get the meaning of double data read. Can you please clarify it a little bit how to do that? 4. Really thanks for this one. I didnt know there were drivers for KS0108. I downloaded from http://en.radzio.dxp.pl/ks0108/. But I am puzzled how to specify the pins for rs, rw, en, cs1/2 etc... I was trying to find something like: sbit rs = P2^0; sbit rw = P2^1; sbit en = P2^2; etc. The low level instructions file (KS0108-8051.c) says #define KS0108_RS (1 << 0) #define KS0108_RW (1 << 1)... I didn't understand its meaning, while i changed #define KS0108_DATA_PORT P3 to my needs... 3. The double data read is explained in the data sheet. 4. Just use the library code as supplied. If your data is on P3 If your rw, en control lines are on P2.1, P2.2 then: #define KS0108_DATA_PORT P3 #define KS0108_DATA_DIR P3 #define KS0108_DATA_PIN P3 #define KS0108_CTRL_PORT P2 #define KS0108_CTR_DIR P2 #define KS0108_RW (1 << 1) #define KS0108_EN (1 << 2) Do not worry about the 8051 not having a DDR ( data direction register ). I am sure that this will all be solved elsewhere in the code. You will probably find that most 8051 compilers will execute an efficient machine instruction for: P2 |= (1<<2); // P2.2 = 1; P2 &= ~(1<<2); // P2.2 = 0; The above syntax is legal C, so will work with any compiler on any architecture. The sfr.2 syntax is NOT portable. Good Luck. I have not used this library but I am sure that it should work ok. David. |
| Topic | Author | Date |
| Ks0108 Graphics LCD read problem | 01/01/70 00:00 | |
| You need to obey the data sheet. | 01/01/70 00:00 | |
| I tried all things but... | 01/01/70 00:00 | |
| Using bit masks. | 01/01/70 00:00 | |
| SORTED ! :) | 01/01/70 00:00 | |
| Your strobe still leaves EN true | 01/01/70 00:00 | |
Prhps other functions take care of it... | 01/01/70 00:00 |