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Added convenience funcions for timer input capture filter and prescaler.

This commit is contained in:
Gareth McMullin 2012-04-08 11:11:52 +12:00
parent 567faa9b61
commit a62473fbdf
2 changed files with 84 additions and 0 deletions
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39
include/libopencm3/stm32/timer.h
View File

@ -851,6 +851,42 @@ enum tim_oc_mode {
TIM_OCM_PWM2,
};
/* Input Capture channel designators */
enum tim_ic_id {
TIM_IC1,
TIM_IC2,
TIM_IC3,
TIM_IC4,
};
/* Input Capture input filter */
enum tim_ic_filter {
TIM_IC_OFF,
TIM_IC_CK_INT_N_2,
TIM_IC_CK_INT_N_4,
TIM_IC_CK_INT_N_8,
TIM_IC_DTF_DIV_2_N_6,
TIM_IC_DTF_DIV_2_N_8,
TIM_IC_DTF_DIV_4_N_6,
TIM_IC_DTF_DIV_4_N_8,
TIM_IC_DTF_DIV_8_N_6,
TIM_IC_DTF_DIV_8_N_8,
TIM_IC_DTF_DIV_16_N_5,
TIM_IC_DTF_DIV_16_N_6,
TIM_IC_DTF_DIV_16_N_8,
TIM_IC_DTF_DIV_32_N_5,
TIM_IC_DTF_DIV_32_N_6,
TIM_IC_DTF_DIV_32_N_8,
};
/* Input Capture input prescaler */
enum tim_ic_psc {
TIM_IC_PSC_OFF,
TIM_IC_PSC_2,
TIM_IC_PSC_4,
TIM_IC_PSC_8,
};
/* --- TIM functions ------------------------------------------------------- */
void timer_reset(u32 timer_peripheral);
void timer_enable_irq(u32 timer_peripheral, u32 irq);
@ -918,4 +954,7 @@ void timer_set_deadtime(u32 timer_peripheral, u32 deadtime);
void timer_generate_event(u32 timer_peripheral, u32 event);
u32 timer_get_counter(u32 timer_peripheral);
void timer_ic_set_filter(u32 timer, enum tim_ic_id ic, enum tim_ic_filter flt);
void timer_ic_set_prescaler(u32 timer, enum tim_ic_id ic, enum tim_ic_psc psc);
#endif

45
lib/stm32/f1/timer.c
View File

@ -914,3 +914,48 @@ u32 timer_get_counter(u32 timer_peripheral)
{
return TIM_CNT(timer_peripheral);
}
void timer_ic_set_filter(u32 timer, enum tim_ic_id ic, enum tim_ic_filter flt)
{
switch (ic) {
case TIM_IC1:
TIM_CCMR1(timer) &= ~TIM_CCMR1_IC1F_MASK;
TIM_CCMR1(timer) |= flt << 4;
break;
case TIM_IC2:
TIM_CCMR1(timer) &= ~TIM_CCMR1_IC2F_MASK;
TIM_CCMR1(timer) |= flt << 12;
break;
case TIM_IC3:
TIM_CCMR2(timer) &= ~TIM_CCMR2_IC3F_MASK;
TIM_CCMR2(timer) |= flt << 4;
break;
case TIM_IC4:
TIM_CCMR2(timer) &= ~TIM_CCMR2_IC4F_MASK;
TIM_CCMR2(timer) |= flt << 12;
break;
}
}
void timer_ic_set_prescaler(u32 timer, enum tim_ic_id ic, enum tim_ic_psc psc)
{
switch (ic) {
case TIM_IC1:
TIM_CCMR1(timer) &= ~TIM_CCMR1_IC1PSC_MASK;
TIM_CCMR1(timer) |= psc << 2;
break;
case TIM_IC2:
TIM_CCMR1(timer) &= ~TIM_CCMR1_IC2PSC_MASK;
TIM_CCMR1(timer) |= psc << 10;
break;
case TIM_IC3:
TIM_CCMR2(timer) &= ~TIM_CCMR2_IC3PSC_MASK;
TIM_CCMR2(timer) |= psc << 4;
break;
case TIM_IC4:
TIM_CCMR2(timer) &= ~TIM_CCMR2_IC4PSC_MASK;
TIM_CCMR2(timer) |= psc << 10;
break;
}
}