| ??? 03/24/07 10:18 Read: times |
#135757 - Too long in the ISR?? Responding to: ???'s previous message |
I suggest you take the output to the LCD out of the interrupt routine. It seems like you are spending longer in the ISR than the rate at which the keyboard clocks arrive. Have the keyboard interrupt buffer the bits that arrive into a RAM area and then have the main code thread look to see when something is ready to send to the LCD and send separate from the interrupt.
On another note your keuboard sends serial data. Your interrupt routine does not look like it is making any attempt to fetch the serial bit stream comes bit by bit with your keyboard clock interrupts. - mkaras |
| Topic | Author | Date |
| catching the keyboard clock pulses | 01/01/70 00:00 | |
| More information | 01/01/70 00:00 | |
| more information | 01/01/70 00:00 | |
| Too long in the ISR?? | 01/01/70 00:00 | |
| short ISR | 01/01/70 00:00 | |
| Serial data | 01/01/70 00:00 | |
| clock rate | 01/01/70 00:00 | |
| better, but not good enough | 01/01/70 00:00 | |
| keyboard clock & system clock | 01/01/70 00:00 | |
| Inefficient code! | 01/01/70 00:00 | |
| send an e-mail to | 01/01/70 00:00 | |
| And many, many more | 01/01/70 00:00 | |
AN434 code | 01/01/70 00:00 |