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targets/hal/TARGET_Maxim/TARGET_MAX32610/sleep.c@636:b0d178e9fa10, 2016-07-07 (annotated)

Committer:
lzbpli
Date:
Thu Jul 07 06:48:59 2016 +0000
Revision:
636:b0d178e9fa10
Parent:
536:c48d7048ab6e 
l053

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 507:d4fc7603a669 1 /*******************************************************************************
mbed_official 507:d4fc7603a669 2 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
mbed_official 507:d4fc7603a669 3 *
mbed_official 507:d4fc7603a669 4 * Permission is hereby granted, free of charge, to any person obtaining a
mbed_official 507:d4fc7603a669 5 * copy of this software and associated documentation files (the "Software"),
mbed_official 507:d4fc7603a669 6 * to deal in the Software without restriction, including without limitation
mbed_official 507:d4fc7603a669 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
mbed_official 507:d4fc7603a669 8 * and/or sell copies of the Software, and to permit persons to whom the
mbed_official 507:d4fc7603a669 9 * Software is furnished to do so, subject to the following conditions:
mbed_official 507:d4fc7603a669 10 *
mbed_official 507:d4fc7603a669 11 * The above copyright notice and this permission notice shall be included
mbed_official 507:d4fc7603a669 12 * in all copies or substantial portions of the Software.
mbed_official 507:d4fc7603a669 13 *
mbed_official 507:d4fc7603a669 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
mbed_official 507:d4fc7603a669 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
mbed_official 507:d4fc7603a669 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
mbed_official 507:d4fc7603a669 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
mbed_official 507:d4fc7603a669 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
mbed_official 507:d4fc7603a669 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
mbed_official 507:d4fc7603a669 20 * OTHER DEALINGS IN THE SOFTWARE.
mbed_official 507:d4fc7603a669 21 *
mbed_official 507:d4fc7603a669 22 * Except as contained in this notice, the name of Maxim Integrated
mbed_official 507:d4fc7603a669 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
mbed_official 507:d4fc7603a669 24 * Products, Inc. Branding Policy.
mbed_official 507:d4fc7603a669 25 *
mbed_official 507:d4fc7603a669 26 * The mere transfer of this software does not imply any licenses
mbed_official 507:d4fc7603a669 27 * of trade secrets, proprietary technology, copyrights, patents,
mbed_official 507:d4fc7603a669 28 * trademarks, maskwork rights, or any other form of intellectual
mbed_official 507:d4fc7603a669 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
mbed_official 507:d4fc7603a669 30 * ownership rights.
mbed_official 507:d4fc7603a669 31 *******************************************************************************
mbed_official 507:d4fc7603a669 32 */
mbed_official 536:c48d7048ab6e 33
mbed_official 507:d4fc7603a669 34 #include "sleep_api.h"
mbed_official 507:d4fc7603a669 35 #include "cmsis.h"
mbed_official 507:d4fc7603a669 36 #include "pwrman_regs.h"
mbed_official 507:d4fc7603a669 37 #include "pwrseq_regs.h"
mbed_official 507:d4fc7603a669 38 #include "ioman_regs.h"
mbed_official 507:d4fc7603a669 39 #include "rtc_regs.h"
mbed_official 507:d4fc7603a669 40
mbed_official 507:d4fc7603a669 41 static mxc_uart_regs_t *stdio_uart = (mxc_uart_regs_t*)STDIO_UART;
mbed_official 507:d4fc7603a669 42
mbed_official 507:d4fc7603a669 43 // Normal wait mode
mbed_official 507:d4fc7603a669 44 void sleep(void)
mbed_official 507:d4fc7603a669 45 {
mbed_official 507:d4fc7603a669 46 // Normal sleep mode for ARM core
mbed_official 507:d4fc7603a669 47 SCB->SCR = 0;
mbed_official 507:d4fc7603a669 48
mbed_official 507:d4fc7603a669 49 __DSB();
mbed_official 507:d4fc7603a669 50 __WFI();
mbed_official 507:d4fc7603a669 51 }
mbed_official 507:d4fc7603a669 52
mbed_official 507:d4fc7603a669 53 // Work-around for issue of clearing power sequencer I/O flag
mbed_official 507:d4fc7603a669 54 static void clearAllGPIOWUD(void)
mbed_official 507:d4fc7603a669 55 {
mbed_official 507:d4fc7603a669 56 uint32_t wud_req0 = MXC_IOMAN->wud_req0;
mbed_official 507:d4fc7603a669 57 uint32_t wud_req1 = MXC_IOMAN->wud_req1;
mbed_official 507:d4fc7603a669 58
mbed_official 507:d4fc7603a669 59 // I/O must be a wakeup detect to clear
mbed_official 507:d4fc7603a669 60 MXC_IOMAN->wud_req0 = 0xffffffff;
mbed_official 507:d4fc7603a669 61 MXC_IOMAN->wud_req1 = 0xffffffff;
mbed_official 507:d4fc7603a669 62
mbed_official 507:d4fc7603a669 63 // Clear all WUDs
mbed_official 507:d4fc7603a669 64 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 507:d4fc7603a669 65 MXC_PWRMAN->wud_pulse0 = 1;
mbed_official 507:d4fc7603a669 66
mbed_official 507:d4fc7603a669 67 // Restore WUD requests
mbed_official 507:d4fc7603a669 68 MXC_IOMAN->wud_req0 = wud_req0;
mbed_official 507:d4fc7603a669 69 MXC_IOMAN->wud_req1 = wud_req1;
mbed_official 507:d4fc7603a669 70 }
mbed_official 507:d4fc7603a669 71
mbed_official 507:d4fc7603a669 72 // Low-power stop mode
mbed_official 507:d4fc7603a669 73 void deepsleep(void)
mbed_official 507:d4fc7603a669 74 {
mbed_official 507:d4fc7603a669 75 __disable_irq();
mbed_official 507:d4fc7603a669 76
mbed_official 507:d4fc7603a669 77 // Wait for all STDIO characters to be sent. The UART clock will stop.
mbed_official 507:d4fc7603a669 78 while (stdio_uart->status & MXC_F_UART_STATUS_TX_BUSY);
mbed_official 507:d4fc7603a669 79
mbed_official 507:d4fc7603a669 80 // Prepare for LP1
mbed_official 507:d4fc7603a669 81 uint32_t reg0 = MXC_PWRSEQ->reg0;
mbed_official 507:d4fc7603a669 82 reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_SVM3EN_SLP; // disable VDD3 SVM during sleep mode
mbed_official 507:d4fc7603a669 83 reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_SVM1EN_SLP; // disable VREG18 SVM during sleep mode
mbed_official 507:d4fc7603a669 84 if (reg0 & MXC_F_PWRSEQ_REG0_PWR_RTCEN_RUN) { // if real-time clock enabled during run
mbed_official 507:d4fc7603a669 85 reg0 |= MXC_F_PWRSEQ_REG0_PWR_RTCEN_SLP; // enable real-time clock during sleep mode
mbed_official 507:d4fc7603a669 86 } else {
mbed_official 507:d4fc7603a669 87 reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_RTCEN_SLP; // disable real-time clock during sleep mode
mbed_official 507:d4fc7603a669 88 }
mbed_official 507:d4fc7603a669 89 reg0 |= MXC_F_PWRSEQ_REG0_PWR_CHZYEN_SLP; // enable CHZY regulator during sleep mode
mbed_official 507:d4fc7603a669 90 reg0 |= MXC_F_PWRSEQ_REG0_PWR_LP1; // go into LP1
mbed_official 507:d4fc7603a669 91 reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_FIRST_BOOT; // clear first boot flag
mbed_official 507:d4fc7603a669 92 MXC_PWRSEQ->reg0 = reg0;
mbed_official 507:d4fc7603a669 93
mbed_official 507:d4fc7603a669 94 MXC_PWRSEQ->reg3 = (MXC_PWRSEQ->reg3 & ~MXC_F_PWRSEQ_REG3_PWR_ROSEL_QUICK) | (3 << MXC_F_PWRSEQ_REG3_PWR_ROSEL_QUICK_POS);
mbed_official 507:d4fc7603a669 95
mbed_official 507:d4fc7603a669 96 // Deep sleep for ARM core
mbed_official 507:d4fc7603a669 97 SCB->SCR = SCB_SCR_SLEEPDEEP_Msk;
mbed_official 507:d4fc7603a669 98
mbed_official 507:d4fc7603a669 99 // clear latches for wakeup detect
mbed_official 507:d4fc7603a669 100 MXC_PWRSEQ->flags = MXC_PWRSEQ->flags;
mbed_official 507:d4fc7603a669 101 if (MXC_PWRSEQ->flags & MXC_F_PWRSEQ_FLAGS_PWR_IO_WAKEUP) {
mbed_official 507:d4fc7603a669 102 // attempt work-around for I/O flag clearing issue
mbed_official 507:d4fc7603a669 103 clearAllGPIOWUD();
mbed_official 507:d4fc7603a669 104 MXC_PWRSEQ->flags = MXC_F_PWRSEQ_FLAGS_PWR_IO_WAKEUP;
mbed_official 507:d4fc7603a669 105 }
mbed_official 507:d4fc7603a669 106
mbed_official 507:d4fc7603a669 107 // Wait for pending RTC transaction
mbed_official 507:d4fc7603a669 108 while (MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
mbed_official 507:d4fc7603a669 109
mbed_official 507:d4fc7603a669 110 // Ensure that the event register is clear
mbed_official 507:d4fc7603a669 111 __SEV(); // set event
mbed_official 507:d4fc7603a669 112 __WFE(); // clear event
mbed_official 507:d4fc7603a669 113
mbed_official 507:d4fc7603a669 114 // Enter LP1
mbed_official 507:d4fc7603a669 115 __WFE();
mbed_official 507:d4fc7603a669 116 // Woke up from LP1
mbed_official 507:d4fc7603a669 117
mbed_official 507:d4fc7603a669 118 // The RTC timer does not update until the next tick
mbed_official 536:c48d7048ab6e 119 uint32_t temp = MXC_RTCTMR->timer;
mbed_official 536:c48d7048ab6e 120 while (MXC_RTCTMR->timer == temp);
mbed_official 507:d4fc7603a669 121
mbed_official 507:d4fc7603a669 122 __enable_irq();
mbed_official 507:d4fc7603a669 123 }