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mbed-os/targets/TARGET_Atmel/TARGET_SAM_CortexM4/drivers/rtt/rtt.c
- Committer:
- kadonotakashi
- Date:
- 2018-10-11
- Revision:
- 3:f3764f852aa8
- Parent:
- 0:8fdf9a60065b
File content as of revision 3:f3764f852aa8:
/** * \file * * \brief Real-time Timer (RTT) driver for SAM. * * Copyright (c) 2011-2015 Atmel Corporation. All rights reserved. * * \asf_license_start * * \page License * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * 3. The name of Atmel may not be used to endorse or promote products derived * from this software without specific prior written permission. * * 4. This software may only be redistributed and used in connection with an * Atmel microcontroller product. * * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * \asf_license_stop * */ /* * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a> */ #include "rtt.h" /// @cond 0 /**INDENT-OFF**/ #ifdef __cplusplus extern "C" { #endif /**INDENT-ON**/ /// @endcond /** * \defgroup sam_drivers_rtt_group Real-time Timer (RTT) * * The Real-time Timer is built around a 32-bit counter used to count * roll-over events of the programmable 16-bit prescaler, which enables * counting elapsed seconds from a 32 kHz slow clock source. * This is a driver for configuration and use of the RTT peripheral. * * @{ */ /* * In follow series chip, the bit RTC1HZ and RTTDIS in RTT_MR are write only. * So we use a variable to record status of these bits. */ #if (SAM4N || SAM4S || SAM4E || SAM4C || SAMG51 || SAM4CP || SAM4CM || SAMV71 || SAMV70 || SAME70 || SAMS70) static uint32_t g_wobits_in_rtt_mr = 0; #endif /** * \brief Initialize the given RTT. * * \note This function restarts the real-time timer. If w_prescaler is equal to zero, * the prescaler period is equal to 2^16 * SCLK period. If not, the prescaler period * is equal to us_prescaler * SCLK period. * * \param p_rtt Pointer to an RTT instance. * \param us_prescaler Prescaler value for the RTT. * * \return 0 if successful. */ uint32_t rtt_init(Rtt *p_rtt, uint16_t us_prescaler) { #if (SAM4N || SAM4S || SAM4E || SAM4C || SAMG51 || SAM4CP || SAM4CM || SAMV71 || SAMV70 || SAME70 || SAMS70) p_rtt->RTT_MR = (us_prescaler | RTT_MR_RTTRST | g_wobits_in_rtt_mr); #else p_rtt->RTT_MR = (us_prescaler | RTT_MR_RTTRST); #endif return 0; } #if (SAM4N || SAM4S || SAM4E || SAM4C || SAMG51 || SAM4CP || SAM4CM || SAMV71 || SAMV70 || SAME70 || SAMS70) /** * \brief Select RTT counter source. * * \param p_rtt Pointer to an RTT instance. * \param is_rtc_sel RTC 1Hz Clock Selection. */ void rtt_sel_source(Rtt *p_rtt, bool is_rtc_sel) { if(is_rtc_sel) { g_wobits_in_rtt_mr |= RTT_MR_RTC1HZ; p_rtt->RTT_MR |= g_wobits_in_rtt_mr; } else { g_wobits_in_rtt_mr &= ~RTT_MR_RTC1HZ; p_rtt->RTT_MR |= g_wobits_in_rtt_mr; } } /** * \brief Enable RTT. * * \param p_rtt Pointer to an RTT instance. */ void rtt_enable(Rtt *p_rtt) { g_wobits_in_rtt_mr &= ~RTT_MR_RTTDIS; p_rtt->RTT_MR |= g_wobits_in_rtt_mr; } /** * \brief Disable RTT. * * \param p_rtt Pointer to an RTT instance. */ void rtt_disable(Rtt *p_rtt) { g_wobits_in_rtt_mr |= RTT_MR_RTTDIS; p_rtt->RTT_MR |= g_wobits_in_rtt_mr; } #elif (SAMG53 || SAMG54 || SAMG55) void rtt_sel_source(Rtt *p_rtt, bool is_rtc_sel) { if(is_rtc_sel) { p_rtt->RTT_MR |= RTT_MR_RTC1HZ; } else { p_rtt->RTT_MR &= ~RTT_MR_RTC1HZ; } } void rtt_enable(Rtt *p_rtt) { p_rtt->RTT_MR &= ~RTT_MR_RTTDIS; } /** * \brief Disable RTT. * * \param p_rtt Pointer to an RTT instance. */ void rtt_disable(Rtt *p_rtt) { p_rtt->RTT_MR |= RTT_MR_RTTDIS; } #endif /** * \brief Enable RTT interrupts. * * \param p_rtt Pointer to an RTT instance. * \param ul_sources Interrupts to be enabled. */ void rtt_enable_interrupt(Rtt *p_rtt, uint32_t ul_sources) { uint32_t temp; temp = p_rtt->RTT_MR; temp |= ul_sources; #if (SAM4N || SAM4S || SAM4E || SAM4C || SAMG51 || SAM4CP || SAM4CM || SAMV71 || SAMV70 || SAME70 || SAMS70) temp |= g_wobits_in_rtt_mr; #endif p_rtt->RTT_MR = temp; } /** * \brief Disable RTT interrupts. * * \param p_rtt Pointer to an RTT instance. * \param ul_sources Interrupts to be disabled. */ void rtt_disable_interrupt(Rtt *p_rtt, uint32_t ul_sources) { uint32_t temp = 0; temp = p_rtt->RTT_MR; temp &= (~ul_sources); #if (SAM4N || SAM4S || SAM4E || SAM4C || SAMG51 || SAM4CP || SAM4CM || SAMV71 || SAMV70 || SAME70 || SAMS70) temp |= g_wobits_in_rtt_mr; #endif p_rtt->RTT_MR = temp; } /** * \brief Read the current value of the RTT timer value. * * \param p_rtt Pointer to an RTT instance. * * \return The current Real-time Timer value. */ uint32_t rtt_read_timer_value(Rtt *p_rtt) { return p_rtt->RTT_VR; } /** * \brief Get the status register value of the given RTT. * * \param p_rtt Pointer to an RTT instance. * * \return The Real-time Timer status. */ uint32_t rtt_get_status(Rtt *p_rtt) { return p_rtt->RTT_SR; } /** * \brief Configure the RTT to generate an alarm at the given time. * * \param p_rtt Pointer to an RTT instance. * \param ul_alarm_time Alarm time. * * \retval 0 Configuration is done. * \retval 1 Parameter error. */ uint32_t rtt_write_alarm_time(Rtt *p_rtt, uint32_t ul_alarm_time) { uint32_t flag; if (ul_alarm_time == 0) { return 1; } flag = p_rtt->RTT_MR & RTT_MR_ALMIEN; rtt_disable_interrupt(RTT, RTT_MR_ALMIEN); /* Alarm time = ALMV + 1 */ p_rtt->RTT_AR = ul_alarm_time - 1; if (flag) { rtt_enable_interrupt(RTT, RTT_MR_ALMIEN); } return 0; } //@} /// @cond 0 /**INDENT-OFF**/ #ifdef __cplusplus } #endif /**INDENT-ON**/ /// @endcond