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| author | Marti Bolivar <mbolivar@leaflabs.com> | 2011-07-21 15:22:19 -0400 |
|---|---|---|
| committer | Marti Bolivar <mbolivar@leaflabs.com> | 2011-07-21 15:22:19 -0400 |
| commit | 722b31d62740de47b417708a7428673faf3d4cab (patch) | |
| tree | 0df1d765dcbf9698f56aff5698e3da7bb67e8ca0 /libmaple/timer.c | |
| parent | e65a05a9f556b96b9d061dc394c022ba21c1c7b4 (diff) | |
| download | librambutan-722b31d62740de47b417708a7428673faf3d4cab.tar.gz librambutan-722b31d62740de47b417708a7428673faf3d4cab.zip | |
timer.c: Minor IRQ dispatch tweaks.
Read TIMx_SR before grabbing a pointer to the user handlers instead of
after. This should shave a couple of cycles off of the time between
IRQ entry and SR read.
Diffstat (limited to 'libmaple/timer.c')
| -rw-r--r-- | libmaple/timer.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/libmaple/timer.c b/libmaple/timer.c index 951baf4..83e9ace 100644 --- a/libmaple/timer.c +++ b/libmaple/timer.c @@ -350,8 +350,8 @@ static inline void dispatch_adv_up(timer_dev *dev) { static inline void dispatch_adv_trg_com(timer_dev *dev) { timer_adv_reg_map *regs = (dev->regs).adv; - void (**hs)(void) = dev->handlers; uint32 dsr = regs->DIER & regs->SR; + void (**hs)(void) = dev->handlers; uint32 handled = 0; /* Logical OR of SR interrupt flags we end up * handling. We clear these. User handlers * must clear overcapture flags, to avoid @@ -365,8 +365,8 @@ static inline void dispatch_adv_trg_com(timer_dev *dev) { static inline void dispatch_adv_cc(timer_dev *dev) { timer_adv_reg_map *regs = (dev->regs).adv; - void (**hs)(void) = dev->handlers; uint32 dsr = regs->DIER & regs->SR; + void (**hs)(void) = dev->handlers; uint32 handled = 0; handle_irq(dsr, TIMER_SR_CC4IF, hs, TIMER_CC4_INTERRUPT, handled); @@ -379,8 +379,8 @@ static inline void dispatch_adv_cc(timer_dev *dev) { static inline void dispatch_general(timer_dev *dev) { timer_gen_reg_map *regs = (dev->regs).gen; - void (**hs)(void) = dev->handlers; uint32 dsr = regs->DIER & regs->SR; + void (**hs)(void) = dev->handlers; uint32 handled = 0; handle_irq(dsr, TIMER_SR_TIF, hs, TIMER_TRG_INTERRUPT, handled); |