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cpu/sam0_common/rtt: add configurable RTT_FREQUENCY

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This commit is contained in:
Francisco Molina 2020-06-17 12:47:43 +02:00
parent 36baec4512
commit 15bbd95b6a
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GPG Key ID: 3E94EAC3DBDEEDA8
1 changed files with 14 additions and 2 deletions
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16
cpu/sam0_common/periph/rtt.c
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@ -36,6 +36,16 @@
#define RTC_MODE0_CTRLA_COUNTSYNC (0x1ul << RTC_MODE0_CTRLA_COUNTSYNC_Pos)
#endif
#ifdef REG_RTC_MODE0_CTRLA
#define RTC_MODE0_PRESCALER \
(__builtin_ctz(2 * RTT_CLOCK_FREQUENCY / RTT_FREQUENCY) << \
RTC_MODE0_CTRLA_PRESCALER_Pos)
#else
#define RTC_MODE0_PRESCALER \
(__builtin_ctz(RTT_CLOCK_FREQUENCY / RTT_FREQUENCY) << \
RTC_MODE0_CTRL_PRESCALER_Pos)
#endif
static rtt_cb_t _overflow_cb;
static void* _overflow_arg;
@ -100,9 +110,11 @@ void rtt_init(void)
/* set 32bit counting mode & enable the RTC */
#ifdef REG_RTC_MODE0_CTRLA
RTC->MODE0.CTRLA.reg = RTC_MODE0_CTRLA_MODE(0) | RTC_MODE0_CTRLA_ENABLE | RTC_MODE0_CTRLA_COUNTSYNC;
RTC->MODE0.CTRLA.reg = RTC_MODE0_CTRLA_MODE(0) | RTC_MODE0_CTRLA_ENABLE |
RTC_MODE0_CTRLA_COUNTSYNC | RTC_MODE0_PRESCALER;
#else
RTC->MODE0.CTRL.reg = RTC_MODE0_CTRL_MODE(0) | RTC_MODE0_CTRL_ENABLE;
RTC->MODE0.CTRL.reg = RTC_MODE0_CTRL_MODE(0) | RTC_MODE0_CTRL_ENABLE |
RTC_MODE0_PRESCALER;
#endif
_wait_syncbusy();