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authorMarti Bolivar <mbolivar@leaflabs.com>2011-07-20 13:48:30 -0400
committerMarti Bolivar <mbolivar@leaflabs.com>2011-07-20 14:02:30 -0400
commite65a05a9f556b96b9d061dc394c022ba21c1c7b4 (patch)
treeab24d8530d74fefaa543abd242418339fc488680 /libraries/Wire/README
parent87e774db58f9e4432fd5f8db0358f0432047a31c (diff)
downloadlibrambutan-e65a05a9f556b96b9d061dc394c022ba21c1c7b4.tar.gz
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timer.c: Optimize IRQ dispatch routines.
Remove dispatch_irq() and dispatch_cc_irqs(). For IRQs which handle exactly one timer interrupt, add new dispatch_single_irq(). The mere fact that the IRQ has been called suffices to prove that its interrupt enable bit (in TIMx_DIER) and interrupt flag (in TIMx_SR) are set. These facts are combined in dispatch_single_irq(), which only needs to check if the timer_dev handler is non-null before calling it and clearing the SR flag. For IRQs which serve multiple timer interrupts, replace the composition of calls to dispatch_irq() and dispatch_cc_irqs() with individualized routines. These eliminate unnecessary timer register reads/writes, and, in the case of capture/compare interrupts, have a loop unrolling performed.
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