Thomas Byrne / mbed-src-stm32f030k6

Public fork of mbed-src to add generic stm32f030k6 target

Fork of mbed-src by mbed official

targets/hal/TARGET_Maxim/TARGET_MAX32600/sleep.c@514:7668256dbe61, 2015-04-16 (annotated)

Committer:
mbed_official
Date:
Thu Apr 16 11:45:13 2015 +0100
Revision:
514:7668256dbe61
Child:
536:c48d7048ab6e
Synchronized with git revision 29ab478a78892415a3c721cdc20b1755b7b01ba1



Full URL: https://github.com/mbedmicro/mbed/commit/29ab478a78892415a3c721cdc20b1755b7b01ba1/



LPC824, SSCI824 - Add GCC_ARM exporter support

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 514:7668256dbe61 1 /*******************************************************************************
mbed_official 514:7668256dbe61 2 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
mbed_official 514:7668256dbe61 3 *
mbed_official 514:7668256dbe61 4 * Permission is hereby granted, free of charge, to any person obtaining a
mbed_official 514:7668256dbe61 5 * copy of this software and associated documentation files (the "Software"),
mbed_official 514:7668256dbe61 6 * to deal in the Software without restriction, including without limitation
mbed_official 514:7668256dbe61 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
mbed_official 514:7668256dbe61 8 * and/or sell copies of the Software, and to permit persons to whom the
mbed_official 514:7668256dbe61 9 * Software is furnished to do so, subject to the following conditions:
mbed_official 514:7668256dbe61 10 *
mbed_official 514:7668256dbe61 11 * The above copyright notice and this permission notice shall be included
mbed_official 514:7668256dbe61 12 * in all copies or substantial portions of the Software.
mbed_official 514:7668256dbe61 13 *
mbed_official 514:7668256dbe61 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
mbed_official 514:7668256dbe61 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
mbed_official 514:7668256dbe61 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
mbed_official 514:7668256dbe61 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
mbed_official 514:7668256dbe61 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
mbed_official 514:7668256dbe61 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
mbed_official 514:7668256dbe61 20 * OTHER DEALINGS IN THE SOFTWARE.
mbed_official 514:7668256dbe61 21 *
mbed_official 514:7668256dbe61 22 * Except as contained in this notice, the name of Maxim Integrated
mbed_official 514:7668256dbe61 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
mbed_official 514:7668256dbe61 24 * Products, Inc. Branding Policy.
mbed_official 514:7668256dbe61 25 *
mbed_official 514:7668256dbe61 26 * The mere transfer of this software does not imply any licenses
mbed_official 514:7668256dbe61 27 * of trade secrets, proprietary technology, copyrights, patents,
mbed_official 514:7668256dbe61 28 * trademarks, maskwork rights, or any other form of intellectual
mbed_official 514:7668256dbe61 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
mbed_official 514:7668256dbe61 30 * ownership rights.
mbed_official 514:7668256dbe61 31 *******************************************************************************
mbed_official 514:7668256dbe61 32 */
mbed_official 514:7668256dbe61 33
mbed_official 514:7668256dbe61 34 #include "sleep_api.h"
mbed_official 514:7668256dbe61 35 #include "us_ticker_api.h"
mbed_official 514:7668256dbe61 36 #include "cmsis.h"
mbed_official 514:7668256dbe61 37 #include "pwrman_regs.h"
mbed_official 514:7668256dbe61 38 #include "pwrseq_regs.h"
mbed_official 514:7668256dbe61 39 #include "ioman_regs.h"
mbed_official 514:7668256dbe61 40 #include "rtc_regs.h"
mbed_official 514:7668256dbe61 41
mbed_official 514:7668256dbe61 42 #define MIN_DEEP_SLEEP_US 500
mbed_official 514:7668256dbe61 43
mbed_official 514:7668256dbe61 44 uint64_t rtc_read_us(void);
mbed_official 514:7668256dbe61 45 void rtc_set_wakeup(uint64_t wakeupUs);
mbed_official 514:7668256dbe61 46 void us_ticker_deinit(void);
mbed_official 514:7668256dbe61 47 void us_ticker_set(timestamp_t timestamp);
mbed_official 514:7668256dbe61 48
mbed_official 514:7668256dbe61 49 static mxc_uart_regs_t *stdio_uart = (mxc_uart_regs_t*)STDIO_UART;
mbed_official 514:7668256dbe61 50
mbed_official 514:7668256dbe61 51 // Normal wait mode
mbed_official 514:7668256dbe61 52 void sleep(void)
mbed_official 514:7668256dbe61 53 {
mbed_official 514:7668256dbe61 54 // Normal sleep mode for ARM core
mbed_official 514:7668256dbe61 55 SCB->SCR = 0;
mbed_official 514:7668256dbe61 56
mbed_official 514:7668256dbe61 57 __DSB();
mbed_official 514:7668256dbe61 58 __WFI();
mbed_official 514:7668256dbe61 59 }
mbed_official 514:7668256dbe61 60
mbed_official 514:7668256dbe61 61 // Work-around for issue of clearing power sequencer I/O flag
mbed_official 514:7668256dbe61 62 static void clearAllGPIOWUD(void)
mbed_official 514:7668256dbe61 63 {
mbed_official 514:7668256dbe61 64 uint32_t wud_req0 = MXC_IOMAN->wud_req0;
mbed_official 514:7668256dbe61 65 uint32_t wud_req1 = MXC_IOMAN->wud_req1;
mbed_official 514:7668256dbe61 66
mbed_official 514:7668256dbe61 67 // I/O must be a wakeup detect to clear
mbed_official 514:7668256dbe61 68 MXC_IOMAN->wud_req0 = 0xffffffff;
mbed_official 514:7668256dbe61 69 MXC_IOMAN->wud_req1 = 0xffffffff;
mbed_official 514:7668256dbe61 70
mbed_official 514:7668256dbe61 71 // Clear all WUDs
mbed_official 514:7668256dbe61 72 MXC_PWRMAN->wud_ctrl = (MXC_E_PWRMAN_PAD_MODE_CLEAR_SET << MXC_F_PWRMAN_WUD_CTRL_PAD_MODE_POS) | MXC_F_PWRMAN_WUD_CTRL_CLEAR_ALL;
mbed_official 514:7668256dbe61 73 MXC_PWRMAN->wud_pulse0 = 1;
mbed_official 514:7668256dbe61 74
mbed_official 514:7668256dbe61 75 // Restore WUD requests
mbed_official 514:7668256dbe61 76 MXC_IOMAN->wud_req0 = wud_req0;
mbed_official 514:7668256dbe61 77 MXC_IOMAN->wud_req1 = wud_req1;
mbed_official 514:7668256dbe61 78 }
mbed_official 514:7668256dbe61 79
mbed_official 514:7668256dbe61 80 // Low-power stop mode
mbed_official 514:7668256dbe61 81 void deepsleep(void)
mbed_official 514:7668256dbe61 82 {
mbed_official 514:7668256dbe61 83 uint64_t sleepStartRtcUs;
mbed_official 514:7668256dbe61 84 uint32_t sleepStartTickerUs;
mbed_official 514:7668256dbe61 85 int32_t sleepDurationUs;
mbed_official 514:7668256dbe61 86 uint64_t sleepEndRtcUs;
mbed_official 514:7668256dbe61 87 uint64_t elapsedUs;
mbed_official 514:7668256dbe61 88
mbed_official 514:7668256dbe61 89 __disable_irq();
mbed_official 514:7668256dbe61 90
mbed_official 514:7668256dbe61 91 // Wait for all STDIO characters to be sent. The UART clock will stop.
mbed_official 514:7668256dbe61 92 while (stdio_uart->status & MXC_F_UART_STATUS_TX_BUSY);
mbed_official 514:7668256dbe61 93
mbed_official 514:7668256dbe61 94 // Record the current times
mbed_official 514:7668256dbe61 95 sleepStartRtcUs = rtc_read_us();
mbed_official 514:7668256dbe61 96 sleepStartTickerUs = us_ticker_read();
mbed_official 514:7668256dbe61 97
mbed_official 514:7668256dbe61 98 // Get the next mbed timer expiration
mbed_official 514:7668256dbe61 99 timestamp_t next_event = 0;
mbed_official 514:7668256dbe61 100 us_ticker_get_next_timestamp(&next_event);
mbed_official 514:7668256dbe61 101 sleepDurationUs = next_event - sleepStartTickerUs;
mbed_official 514:7668256dbe61 102
mbed_official 514:7668256dbe61 103 if (sleepDurationUs < MIN_DEEP_SLEEP_US) {
mbed_official 514:7668256dbe61 104 /* The next wakeup is too soon. */
mbed_official 514:7668256dbe61 105 __enable_irq();
mbed_official 514:7668256dbe61 106 return;
mbed_official 514:7668256dbe61 107 }
mbed_official 514:7668256dbe61 108
mbed_official 514:7668256dbe61 109 // Disable the us_ticker. It won't be clocked in DeepSleep
mbed_official 514:7668256dbe61 110 us_ticker_deinit();
mbed_official 514:7668256dbe61 111
mbed_official 514:7668256dbe61 112 // Prepare to wakeup from the RTC
mbed_official 514:7668256dbe61 113 rtc_set_wakeup(sleepStartRtcUs + sleepDurationUs);
mbed_official 514:7668256dbe61 114
mbed_official 514:7668256dbe61 115 // Prepare for LP1
mbed_official 514:7668256dbe61 116 uint32_t reg0 = MXC_PWRSEQ->reg0;
mbed_official 514:7668256dbe61 117 reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_SVM3EN_SLP; // disable VDD3 SVM during sleep mode
mbed_official 514:7668256dbe61 118 reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_SVM1EN_SLP; // disable VREG18 SVM during sleep mode
mbed_official 514:7668256dbe61 119 if (reg0 & MXC_F_PWRSEQ_REG0_PWR_RTCEN_RUN) { // if real-time clock enabled during run
mbed_official 514:7668256dbe61 120 reg0 |= MXC_F_PWRSEQ_REG0_PWR_RTCEN_SLP; // enable real-time clock during sleep mode
mbed_official 514:7668256dbe61 121 } else {
mbed_official 514:7668256dbe61 122 reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_RTCEN_SLP; // disable real-time clock during sleep mode
mbed_official 514:7668256dbe61 123 }
mbed_official 514:7668256dbe61 124 reg0 |= MXC_F_PWRSEQ_REG0_PWR_CHZYEN_SLP; // enable CHZY regulator during sleep mode
mbed_official 514:7668256dbe61 125 reg0 |= MXC_F_PWRSEQ_REG0_PWR_LP1; // go into LP1
mbed_official 514:7668256dbe61 126 reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_FIRST_BOOT; // clear first boot flag
mbed_official 514:7668256dbe61 127 MXC_PWRSEQ->reg0 = reg0;
mbed_official 514:7668256dbe61 128
mbed_official 514:7668256dbe61 129 MXC_PWRSEQ->reg3 = (MXC_PWRSEQ->reg3 & ~MXC_F_PWRSEQ_REG3_PWR_ROSEL_QUICK) | (3 << MXC_F_PWRSEQ_REG3_PWR_ROSEL_QUICK_POS);
mbed_official 514:7668256dbe61 130
mbed_official 514:7668256dbe61 131 // Deep sleep for ARM core
mbed_official 514:7668256dbe61 132 SCB->SCR = SCB_SCR_SLEEPDEEP_Msk;
mbed_official 514:7668256dbe61 133
mbed_official 514:7668256dbe61 134 // clear latches for wakeup detect
mbed_official 514:7668256dbe61 135 MXC_PWRSEQ->flags = MXC_PWRSEQ->flags;
mbed_official 514:7668256dbe61 136 if (MXC_PWRSEQ->flags & MXC_F_PWRSEQ_FLAGS_PWR_IO_WAKEUP) {
mbed_official 514:7668256dbe61 137 // attempt work-around for I/O flag clearing issue
mbed_official 514:7668256dbe61 138 clearAllGPIOWUD();
mbed_official 514:7668256dbe61 139 MXC_PWRSEQ->flags = MXC_F_PWRSEQ_FLAGS_PWR_IO_WAKEUP;
mbed_official 514:7668256dbe61 140 }
mbed_official 514:7668256dbe61 141
mbed_official 514:7668256dbe61 142 // Wait for pending RTC transaction
mbed_official 514:7668256dbe61 143 while (MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
mbed_official 514:7668256dbe61 144
mbed_official 514:7668256dbe61 145 // Ensure that the event register is clear
mbed_official 514:7668256dbe61 146 __SEV(); // set event
mbed_official 514:7668256dbe61 147 __WFE(); // clear event
mbed_official 514:7668256dbe61 148
mbed_official 514:7668256dbe61 149 // Enter LP1
mbed_official 514:7668256dbe61 150 __WFE();
mbed_official 514:7668256dbe61 151 // Woke up from LP1
mbed_official 514:7668256dbe61 152
mbed_official 514:7668256dbe61 153 // The RTC timer does not update until the next tick
mbed_official 514:7668256dbe61 154 uint64_t tempUs = rtc_read_us();
mbed_official 514:7668256dbe61 155 do {
mbed_official 514:7668256dbe61 156 sleepEndRtcUs = rtc_read_us();
mbed_official 514:7668256dbe61 157 } while(sleepEndRtcUs == tempUs);
mbed_official 514:7668256dbe61 158
mbed_official 514:7668256dbe61 159 // Get the elapsed time from the RTC. Wakeup could have been from some other event.
mbed_official 514:7668256dbe61 160 elapsedUs = sleepEndRtcUs - sleepStartRtcUs;
mbed_official 514:7668256dbe61 161
mbed_official 514:7668256dbe61 162 // Update the us_ticker. It was not clocked during DeepSleep
mbed_official 514:7668256dbe61 163 us_ticker_init();
mbed_official 514:7668256dbe61 164 us_ticker_set(sleepStartTickerUs + elapsedUs);
mbed_official 514:7668256dbe61 165 us_ticker_get_next_timestamp(&next_event);
mbed_official 514:7668256dbe61 166 us_ticker_set_interrupt(next_event);
mbed_official 514:7668256dbe61 167
mbed_official 514:7668256dbe61 168 __enable_irq();
mbed_official 514:7668256dbe61 169 }