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nrf5/hal/rtc: Updating hal driver to calculate prescaler a bit more verbose. Using 1 second interval ticks.

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This commit is contained in:
Glenn Ruben Bakke 2017-06-02 19:04:19 +02:00
parent b785e145d2
commit 45303796d7
1 changed files with 6 additions and 2 deletions
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8
nrf5/hal/hal_rtc.c
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@ -30,6 +30,10 @@
#ifdef HAL_RTC_MODULE_ENABLED #ifdef HAL_RTC_MODULE_ENABLED
#define HAL_LFCLK_FREQ (32768UL)
#define HAL_RTC_FREQ (10UL)
#define HAL_RTC_COUNTER_PRESCALER ((HAL_LFCLK_FREQ/HAL_RTC_FREQ)-1)
static hal_rtc_app_callback m_callback; static hal_rtc_app_callback m_callback;
static uint32_t m_period[sizeof(RTC_BASE_POINTERS) / sizeof(uint32_t)]; static uint32_t m_period[sizeof(RTC_BASE_POINTERS) / sizeof(uint32_t)];
@ -50,14 +54,14 @@ void hal_rtc_init(hal_rtc_conf_t const * p_rtc_conf) {
m_period[p_rtc_conf->id] = p_rtc_conf->period; m_period[p_rtc_conf->id] = p_rtc_conf->period;
p_rtc->PRESCALER = (32768 / 32) - 1; // approx ms ticks. p_rtc->PRESCALER = HAL_RTC_COUNTER_PRESCALER;
hal_irq_priority(RTC_IRQ_NUM(p_rtc_conf->id), p_rtc_conf->irq_priority); hal_irq_priority(RTC_IRQ_NUM(p_rtc_conf->id), p_rtc_conf->irq_priority);
} }
void hal_rtc_start(uint8_t id) { void hal_rtc_start(uint8_t id) {
NRF_RTC_Type * p_rtc = RTC_BASE(id); NRF_RTC_Type * p_rtc = RTC_BASE(id);
uint32_t period = m_period[id]; uint32_t period = HAL_RTC_FREQ * m_period[id];
uint32_t counter = p_rtc->COUNTER; uint32_t counter = p_rtc->COUNTER;
p_rtc->CC[0] = counter + period; p_rtc->CC[0] = counter + period;