| ??? 07/17/11 09:27 Modified: 07/17/11 09:57 Read: times |
#182871 - Experiment for yourself. Responding to: ???'s previous message |
Patrick A Avong said:
i bought a 16x32 dotmatrix single colour (red) from a third party, no documentation, no information on the BUS interface. i have been having trouble to get character display on it.
Feature of the display. 16 rows, 32 columns. the components i could pick from the back are 74HCT595 column driver, the rows are scan using AMP4953. row the row are bridge as follows row 1-9, row 2-10, row 3-11, row 4-12, row 5-13, row 6-14, row, 7 -15, 8 -16. 74HC138 decoder for selecting rows through AMP4953. pin 5 of the decoder is used to blank the display. the BUS interface: Shift clock (RCL $ SCL) for 74HCT595, the serial data input, the board is a product of EVTECK from china I have no idea what an AMP4953 is. If you can identify the major chips, you could do some guesswork. e.g. ~6 pins in the interface means you are probably SPI. e.g. no memory chips or long shift registers mean that you have to write every byte to multiplex any display. e.g. if it has some storage, you probably only send it data when it alters and it quietly multiplexes by itself. Buying anything without a data sheet is unwise. If you like time-wasting, identify the SPI pins and experiment with sending some data. It is fairly likely that it would expect a 'command' followed by 'data'. You should be able to devise a 'test' program. Otherwise throw it in the bin, and put it down to experience. David. |
| Topic | Author | Date |
| Help with Assebly code for this display | 01/01/70 00:00 | |
| you did yourself in | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
Experiment for yourself. | 01/01/70 00:00 |