/*! \brief to initialiaze hw timer
*/
uint8_t tmr_init(void)
{
uint8_t tmr_mul;
/* Configure clock service. */
#if SAM4L
sysclk_enable_peripheral_clock(TIMER);
#else
sysclk_enable_peripheral_clock(ID_TC);
#endif
/* Get system clock. */
tmr_mul = sysclk_get_peripheral_bus_hz(TIMER) / DEF_1MHZ;
tmr_mul = tmr_mul >> 1;
#if SAM4L
tc_init(TIMER, TIMER_CHANNEL_ID,
TC_CMR_TCCLKS_TIMER_CLOCK2 | TC_CMR_WAVE |
TC_CMR_WAVSEL_UP_NO_AUTO);
#elif SAM4E
tc_init(TIMER, TIMER_CHANNEL_ID,
TC_CMR_TCCLKS_TIMER_CLOCK1 | TC_CMR_WAVE |
TC_CMR_WAVSEL_UP_RC);
#else
tc_init(TIMER, TIMER_CHANNEL_ID,
TC_CMR_TCCLKS_TIMER_CLOCK1 | TC_CMR_WAVE |
TC_CMR_WAVSEL_UP);
#endif
/* Configure and enable interrupt on RC compare. */
configure_NVIC(TIMER, TIMER_CHANNEL_ID);
#if SAM4E
tc_get_status(TIMER, TIMER_CHANNEL_ID);
tc_enable_interrupt(TIMER, TIMER_CHANNEL_ID, TC_IER_CPCS);
tc_write_rc(TIMER, TIMER_CHANNEL_ID, UINT16_MAX);
#else
tc_get_status(TIMER, TIMER_CHANNEL_ID);
tc_enable_interrupt(TIMER, TIMER_CHANNEL_ID, TC_IER_COVFS);
#endif
tmr_disable_cc_interrupt();
tc_start(TIMER, TIMER_CHANNEL_ID);
return tmr_mul;
}
/*! \brief to initialiaze hw timer
*/
uint8_t tmr_init(void)
{
uint8_t timer_multiplier;
/* Options for waveform generation. */
tc_waveform_opt_t waveform_opt = {
.channel = TIMER_CHANNEL_ID, /* Channel selection. */
.bswtrg = TC_EVT_EFFECT_NOOP, /* Software trigger effect
* on TIOB. */
.beevt = TC_EVT_EFFECT_NOOP, /* External event effect
* on TIOB. */
.bcpc = TC_EVT_EFFECT_NOOP, /* RC compare effect on
* TIOB. */
.bcpb = TC_EVT_EFFECT_NOOP, /* RB compare effect on
* TIOB. */
.aswtrg = TC_EVT_EFFECT_NOOP, /* Software trigger effect
* on TIOA. */
.aeevt = TC_EVT_EFFECT_NOOP, /* External event effect
* on TIOA. */
.acpc = TC_EVT_EFFECT_NOOP, /* RC compare effect on
* TIOA */
.acpa = TC_EVT_EFFECT_NOOP, /* RA compare effect on
* TIOA */
.wavsel = TC_WAVEFORM_SEL_UP_MODE, /* Waveform selection: Up
* mode without automatic
* trigger on RC compare.
**/
.enetrg = false, /* External event trigger
* enable. */
.eevt = TC_EXT_EVENT_SEL_TIOB_INPUT, /* External event
* selection. */
.eevtedg = TC_SEL_NO_EDGE, /* External event edge
* selection. */
.cpcdis = false, /* Counter disable when RC
* compare. */
.cpcstop = false, /* Counter clock stopped
* with RC compare. */
.burst = TC_BURST_NOT_GATED, /* Burst signal selection.
**/
.clki = TC_CLOCK_RISING_EDGE, /* Clock inversion. */
.tcclks = TC_CLOCK_SOURCE_TC2 /* Internal source clock
* 3, connected to fPBA /
* 8. */
};
sysclk_enable_peripheral_clock(TIMER);
/* Initialize the timer/counter. */
tc_init_waveform(TIMER, &waveform_opt);
/* calculate how faster the timer with current clk freq compared to
* timer with 1Mhz */
timer_multiplier = sysclk_get_peripheral_bus_hz(TIMER) / DEF_1MHZ;
/* */
timer_multiplier = timer_multiplier >> 1;
configure_irq_handler();
tmr_enable_ovf_interrupt();
tmr_disable_cc_interrupt();
tc_start(TIMER, TIMER_CHANNEL_ID);
return timer_multiplier;
}
/*! \brief to disable compare interrupt
*/
void tmr_disable_cc_interrupt(void)
{
tc_interrupt.cpcs = 0;
tc_configure_interrupts(TIMER, TIMER_CHANNEL_ID, &tc_interrupt);
}
