diff options
Diffstat (limited to 'libmaple')
| -rw-r--r-- | libmaple/timer.c | 70 |
1 files changed, 46 insertions, 24 deletions
diff --git a/libmaple/timer.c b/libmaple/timer.c index 367e1f4..377bab7 100644 --- a/libmaple/timer.c +++ b/libmaple/timer.c @@ -309,20 +309,22 @@ void __irq_tim8_cc(void) { } #endif -static inline void dispatch_irq(timer_dev *dev, uint8 iid, uint8 sr_bit); +static inline void dispatch_irq(timer_dev *dev, + timer_interrupt_id iid, + uint32 irq_mask); static inline void dispatch_cc_irqs(timer_dev *dev); static inline void dispatch_adv_brk(timer_dev *dev) { - dispatch_irq(dev, TIMER_BREAK_INTERRUPT, TIMER_SR_BIF_BIT); + dispatch_irq(dev, TIMER_BREAK_INTERRUPT, TIMER_SR_BIF); } static inline void dispatch_adv_up(timer_dev *dev) { - dispatch_irq(dev, TIMER_UPDATE_INTERRUPT, TIMER_SR_UIF_BIT); + dispatch_irq(dev, TIMER_UPDATE_INTERRUPT, TIMER_SR_UIF); } static inline void dispatch_adv_trg_com(timer_dev *dev) { - dispatch_irq(dev, TIMER_TRG_INTERRUPT, TIMER_SR_TIF_BIT); - dispatch_irq(dev, TIMER_COM_INTERRUPT, TIMER_SR_COMIF_BIT); + dispatch_irq(dev, TIMER_TRG_INTERRUPT, TIMER_SR_TIF); + dispatch_irq(dev, TIMER_COM_INTERRUPT, TIMER_SR_COMIF); } static inline void dispatch_adv_cc(timer_dev *dev) { @@ -330,42 +332,62 @@ static inline void dispatch_adv_cc(timer_dev *dev) { } static inline void dispatch_general(timer_dev *dev) { - dispatch_irq(dev, TIMER_TRG_INTERRUPT, TIMER_SR_TIF_BIT); + dispatch_irq(dev, TIMER_TRG_INTERRUPT, TIMER_SR_TIF); dispatch_cc_irqs(dev); - dispatch_irq(dev, TIMER_UPDATE_INTERRUPT, TIMER_SR_UIF_BIT); + dispatch_irq(dev, TIMER_UPDATE_INTERRUPT, TIMER_SR_UIF); } static inline void dispatch_basic(timer_dev *dev) { - dispatch_irq(dev, TIMER_UPDATE_INTERRUPT, TIMER_SR_UIF_BIT); -} - -static inline void dispatch_irq(timer_dev *dev, uint8 iid, uint8 sr_bit) { - __io uint32 *sr = &(dev->regs).bas->SR; - if (bb_peri_get_bit(sr, sr_bit)) { - if (dev->handlers[iid]) - (dev->handlers[iid])(); - bb_peri_set_bit(sr, sr_bit, 0); + dispatch_irq(dev, TIMER_UPDATE_INTERRUPT, TIMER_SR_UIF); +} + +/* Note: The following dispatch routines play some tricks that depend + * on the positions of the relevant interrupt-related bits in TIMx_SR + * and TIMx_DIER. */ + +/* TODO (optimization): since the callers all know the timer + * statically, it may be possible to speed these dispatch routines up + * by skipping the timer_dev and accessing timer_reg_map/handlers + * directly */ + +static inline void dispatch_irq(timer_dev *dev, + timer_interrupt_id iid, + uint32 irq_mask) { + timer_bas_reg_map *regs = (dev->regs).bas; + void (*handler)(void) = dev->handlers[iid]; + if ((regs->DIER & irq_mask) && (regs->SR & irq_mask) && handler) { + handler(); + regs->SR &= ~irq_mask; } } +#define DIER_CCS (TIMER_DIER_CC4IE | \ + TIMER_DIER_CC3IE | \ + TIMER_DIER_CC2IE | \ + TIMER_DIER_CC1IE) + static inline void dispatch_cc_irqs(timer_dev *dev) { - uint32 sr = (dev->regs).gen->SR; - uint32 sr_clear = 0; + timer_gen_reg_map *regs = (dev->regs).gen; + uint32 dier = regs->DIER; + uint32 sr; + uint32 sr_clear; /* cuts down on writes to a volatile register */ uint32 b; - ASSERT_FAULT(sr & (TIMER_SR_CC1IF | TIMER_SR_CC2IF | - TIMER_SR_CC3IF | TIMER_SR_CC4IF)); + if (!(dier & DIER_CCS)) { + return; + } + sr = regs->SR; + sr_clear = 0; for (b = TIMER_SR_CC1IF_BIT; b <= TIMER_SR_CC4IF_BIT; b++) { uint32 mask = BIT(b); - if (sr & mask) { - if (dev->handlers[b]) - (dev->handlers[b])(); + if ((dier & mask) && (sr & mask) && dev->handlers[b]) { + (dev->handlers[b])(); sr_clear |= mask; } } - (dev->regs).gen->SR &= ~sr_clear; + regs->SR &= ~sr_clear; } /* |