Il 22/03/2012 11:29, Stefano Stabellini ha scritto: >> The purpose of using two timer is trying to keep the UF, AF and UIP >> synchronous. User can poll UIP to check UF and AF bit. If we use >> timer for UF/AF bit track and check UIP by another way, since the >> timer will be fired with delay, then the problem is encountered: >> the UIP is cleared, but due to the delay of timer, the UF/AF bit is >> not set. So we need to check them on a same level. Although we can >> update UF/AF when reading it, the logic is too complicated, >> especially for AF bit.
FWIW, the solution I used when I removed the second timer from the current code (not yet posted, I do hope your patches can be fixed!) was to set UIP when reading A, and clear it in the timer. You have something like that, but keep the two timers. Paolo
