| ??? 08/16/06 20:56 Read: times |
#122378 - that's basically what the KBI does Responding to: ???'s previous message |
I would use it as a (slower) int0 or int1, in which all the inputs are OR'd together
There is no reason whatsoever to OR the inputs. the KBI does that function beautifully. If you use the OR, you will have the very same problem (the interrupt does not disappear till all keys are released). I am now using a timer, it was far less hassle, but still disappointing, the KBI held such promise. in not having to poll the IO when, possibly nothing of interest was happening on the IO. "using a timer" is the way to go; however the overhead "when, possibly nothing of interest was happening" can be VERY minimum. What you do (assuming you enable cols and read rows) is in the very top of your timer ISR enable ALL cols and if all rows still off, get out of dodge. If you leave the all cols enabled till a key is seen (I do), the code to get out is about 3 lines, no 'scan' needed. Erik |
| Topic | Author | Date |
| LPC 9xx Can't clear KBIF | 01/01/70 00:00 | |
| Turn it off? | 01/01/70 00:00 | |
| I could turn it off | 01/01/70 00:00 | |
| to turn the KBIF, you have to change the condition | 01/01/70 00:00 | |
| Thanks Erik - I'll give it a go | 01/01/70 00:00 | |
| an added comment | 01/01/70 00:00 | |
| What is the rate of change on the input signals? | 01/01/70 00:00 | |
| nothing of value except the ability to wake up the | 01/01/70 00:00 | |
| Interrupt for pulse train | 01/01/70 00:00 | |
| that's basically what the KBI does | 01/01/70 00:00 | |
| Rate of change ~<100kHz | 01/01/70 00:00 | |
| why not? | 01/01/70 00:00 | |
| I did not discuss | 01/01/70 00:00 | |
| It is ok but KBIF is set forever | 01/01/70 00:00 | |
| that you do not clear the reason | 01/01/70 00:00 | |
| I change the state of the pin before | 01/01/70 00:00 | |
| could be the problem | 01/01/70 00:00 | |
Simulators problem | 01/01/70 00:00 | |
| Remote Control using AT89C2051 schematic | 01/01/70 00:00 | |
| just great | 01/01/70 00:00 | |
| Another BS answer. | 01/01/70 00:00 | |
| No BS, I did | 01/01/70 00:00 |