| ??? 09/07/04 16:20 Read: times |
#77051 - RE: almost Responding to: ???'s previous message |
Reza Fallahati wrote: ------------------------------- "as you know, keypad scanning routines are usually called within a timer ISR with intervals of 10-30 ms(some engineers have recommended longer intervals) and usually after reading pins they save the value in a variable and compare next reading and only if the same pin was in signaled state again they report a pressed key." "CPU burden is decreased because of not performing debouncing(I admit that this decrease can be very slight)" how? may be i'm missing something. as reading is done by an ISR you are not performing the debouncing delay. you can do any thing usefull between the two calls. abhishek |
