diff options
Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32610/rtc_api.c')
-rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32610/rtc_api.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32610/rtc_api.c b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32610/rtc_api.c new file mode 100644 index 0000000000..033420d4ad --- /dev/null +++ b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32610/rtc_api.c @@ -0,0 +1,190 @@ +/******************************************************************************* + * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES + * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Except as contained in this notice, the name of Maxim Integrated + * Products, Inc. shall not be used except as stated in the Maxim Integrated + * Products, Inc. Branding Policy. + * + * The mere transfer of this software does not imply any licenses + * of trade secrets, proprietary technology, copyrights, patents, + * trademarks, maskwork rights, or any other form of intellectual + * property whatsoever. Maxim Integrated Products, Inc. retains all + * ownership rights. + ******************************************************************************* + */ + +#include "rtc_api.h" +#include "cmsis.h" +#include "rtc_regs.h" +#include "pwrseq_regs.h" +#include "clkman_regs.h" + +static int rtc_inited = 0; +static volatile uint32_t overflow_cnt = 0; +static uint32_t overflow_alarm = 0; + +//****************************************************************************** +static void overflow_handler(void) +{ + MXC_RTCTMR->flags = MXC_F_RTC_FLAGS_ASYNC_CLR_FLAGS; + overflow_cnt++; + + if (overflow_cnt == overflow_alarm) { + // Enable the comparator interrupt for the alarm + MXC_RTCTMR->inten |= MXC_F_RTC_INTEN_COMP0; + } +} + +//****************************************************************************** +static void alarm_handler(void) +{ + MXC_RTCTMR->inten &= ~MXC_F_RTC_INTEN_COMP0; + MXC_RTCTMR->flags = MXC_F_RTC_FLAGS_ASYNC_CLR_FLAGS; +} + +//****************************************************************************** +void rtc_init(void) +{ + if(rtc_inited) { + return; + } + rtc_inited = 1; + + // Enable the clock to the synchronizer + MXC_CLKMAN->clk_ctrl_13_rtc_int_sync = MXC_E_CLKMAN_CLK_SCALE_ENABLED; + + // Enable the clock to the RTC + MXC_PWRSEQ->reg0 |= MXC_F_PWRSEQ_REG0_PWR_RTCEN_RUN; + + // Set the divider from the 4kHz clock + MXC_RTCTMR->prescale = MXC_E_RTC_PRESCALE_DIV_2_0; + + // Enable the overflow interrupt + MXC_RTCTMR->inten |= MXC_F_RTC_FLAGS_OVERFLOW; + + // Prepare interrupt handlers + NVIC_SetVector(RTC0_IRQn, (uint32_t)alarm_handler); + NVIC_EnableIRQ(RTC0_IRQn); + NVIC_SetVector(RTC3_IRQn, (uint32_t)overflow_handler); + NVIC_EnableIRQ(RTC3_IRQn); + + // Enable the RTC + MXC_RTCTMR->ctrl |= MXC_F_RTC_CTRL_ENABLE; +} + +//****************************************************************************** +void rtc_free(void) +{ + if (MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_ENABLE) { + // Clear and disable RTC + MXC_RTCTMR->ctrl |= MXC_F_RTC_CTRL_CLEAR; + MXC_RTCTMR->ctrl &= ~MXC_F_RTC_CTRL_ENABLE; + + // Wait for pending transactions + while(MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING); + } + + // Disable the clock to the RTC + MXC_PWRSEQ->reg0 &= ~(MXC_F_PWRSEQ_REG0_PWR_RTCEN_RUN | MXC_F_PWRSEQ_REG0_PWR_RTCEN_SLP); + + // Disable the clock to the synchronizer + MXC_CLKMAN->clk_ctrl_13_rtc_int_sync = MXC_E_CLKMAN_CLK_SCALE_DISABLED; +} + +//****************************************************************************** +int rtc_isenabled(void) +{ + return (MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_ENABLE); +} + +//****************************************************************************** +time_t rtc_read(void) +{ + unsigned int shift_amt; + uint32_t ovf_cnt_1, ovf_cnt_2, timer_cnt; + + // Account for a change in the default prescaler + shift_amt = MXC_E_RTC_PRESCALE_DIV_2_12 - MXC_RTCTMR->prescale; + + // Ensure coherency between overflow_cnt and timer + do { + ovf_cnt_1 = overflow_cnt; + timer_cnt = MXC_RTCTMR->timer; + ovf_cnt_2 = overflow_cnt; + } while (ovf_cnt_1 != ovf_cnt_2); + + return (timer_cnt >> shift_amt) + (ovf_cnt_1 << (32 - shift_amt)); +} + +//****************************************************************************** +uint64_t rtc_read_us(void) +{ + unsigned int shift_amt; + uint32_t ovf_cnt_1, ovf_cnt_2, timer_cnt; + uint64_t currentUs; + + // Account for a change in the default prescaler + shift_amt = MXC_E_RTC_PRESCALE_DIV_2_12 - MXC_RTCTMR->prescale; + + // Ensure coherency between overflow_cnt and timer + do { + ovf_cnt_1 = overflow_cnt; + timer_cnt = MXC_RTCTMR->timer; + ovf_cnt_2 = overflow_cnt; + } while (ovf_cnt_1 != ovf_cnt_2); + + currentUs = (((uint64_t)timer_cnt * 1000000) >> shift_amt) + (((uint64_t)ovf_cnt_1 * 1000000) << (32 - shift_amt)); + + return currentUs; +} + +//****************************************************************************** +void rtc_write(time_t t) +{ + // Account for a change in the default prescaler + unsigned int shift_amt = MXC_E_RTC_PRESCALE_DIV_2_12 - MXC_RTCTMR->prescale; + + MXC_RTCTMR->ctrl &= ~MXC_F_RTC_CTRL_ENABLE; // disable the timer while updating + MXC_RTCTMR->timer = t << shift_amt; + overflow_cnt = t >> (32 - shift_amt); + MXC_RTCTMR->ctrl |= MXC_F_RTC_CTRL_ENABLE; // enable the timer while updating +} + +//****************************************************************************** +void rtc_set_wakeup(uint64_t wakeupUs) +{ + // Account for a change in the default prescaler + unsigned int shift_amt = MXC_E_RTC_PRESCALE_DIV_2_12 - MXC_RTCTMR->prescale; + + // Disable the alarm while it is prepared + MXC_RTCTMR->inten &= ~MXC_F_RTC_INTEN_COMP0; + MXC_RTCTMR->flags = MXC_F_RTC_FLAGS_COMP0; // clear interrupt + + overflow_alarm = (wakeupUs >> (32 - shift_amt)) / 1000000; + + if (overflow_alarm == overflow_cnt) { + MXC_RTCTMR->comp[0] = (wakeupUs << shift_amt) / 1000000; + MXC_RTCTMR->inten |= MXC_F_RTC_INTEN_COMP0; + } + + // Enable wakeup from RTC + MXC_PWRSEQ->msk_flags &= ~(MXC_F_PWRSEQ_MSK_FLAGS_RTC_ROLLOVER | MXC_F_PWRSEQ_MSK_FLAGS_RTC_CMPR0); +} |