mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_Maxim/TARGET_MAX32620/sleep.c@181:57724642e740, 2018-02-16 (annotated)

Committer:
AnnaBridge
Date:
Fri Feb 16 16:09:33 2018 +0000
Revision:
181:57724642e740
Parent:
171:89b338f31ef1 
mbed-dev library. Release version 159.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /*******************************************************************************
<> 149:156823d33999 2 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Permission is hereby granted, free of charge, to any person obtaining a
<> 149:156823d33999 5 * copy of this software and associated documentation files (the "Software"),
<> 149:156823d33999 6 * to deal in the Software without restriction, including without limitation
<> 149:156823d33999 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
<> 149:156823d33999 8 * and/or sell copies of the Software, and to permit persons to whom the
<> 149:156823d33999 9 * Software is furnished to do so, subject to the following conditions:
<> 149:156823d33999 10 *
<> 149:156823d33999 11 * The above copyright notice and this permission notice shall be included
<> 149:156823d33999 12 * in all copies or substantial portions of the Software.
<> 149:156823d33999 13 *
<> 149:156823d33999 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
<> 149:156823d33999 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
<> 149:156823d33999 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
<> 149:156823d33999 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
<> 149:156823d33999 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
<> 149:156823d33999 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
<> 149:156823d33999 20 * OTHER DEALINGS IN THE SOFTWARE.
<> 149:156823d33999 21 *
<> 149:156823d33999 22 * Except as contained in this notice, the name of Maxim Integrated
<> 149:156823d33999 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
<> 149:156823d33999 24 * Products, Inc. Branding Policy.
<> 149:156823d33999 25 *
<> 149:156823d33999 26 * The mere transfer of this software does not imply any licenses
<> 149:156823d33999 27 * of trade secrets, proprietary technology, copyrights, patents,
<> 149:156823d33999 28 * trademarks, maskwork rights, or any other form of intellectual
<> 149:156823d33999 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
<> 149:156823d33999 30 * ownership rights.
<> 149:156823d33999 31 *******************************************************************************
<> 149:156823d33999 32 */
<> 149:156823d33999 33
<> 149:156823d33999 34 #include "sleep_api.h"
<> 149:156823d33999 35 #include "pwrman_regs.h"
<> 149:156823d33999 36 #include "pwrseq_regs.h"
<> 149:156823d33999 37 #include "clkman_regs.h"
<> 149:156823d33999 38 #include "ioman_regs.h"
<> 149:156823d33999 39 #include "rtc_regs.h"
<> 149:156823d33999 40 #include "usb_regs.h"
<> 149:156823d33999 41
<> 149:156823d33999 42 #define REVISION_A3 2
<> 149:156823d33999 43 #define REVISION_A4 3
<> 149:156823d33999 44
<> 149:156823d33999 45 // USB state to be restored upon wakeup
<> 149:156823d33999 46 typedef struct {
<> 149:156823d33999 47 uint32_t dev_cn;
<> 149:156823d33999 48 uint32_t dev_inten;
<> 149:156823d33999 49 uint32_t ep_base;
<> 149:156823d33999 50 uint32_t ep[MXC_USB_NUM_EP];
<> 149:156823d33999 51 } usb_state_t;
<> 149:156823d33999 52
<> 149:156823d33999 53 static mxc_uart_regs_t *stdio_uart = (mxc_uart_regs_t*)STDIO_UART;
<> 149:156823d33999 54 static int restore_usb;
<> 149:156823d33999 55 static usb_state_t usb_state;
<> 149:156823d33999 56
<> 160:d5399cc887bb 57 void hal_sleep(void)
<> 149:156823d33999 58 {
<> 149:156823d33999 59 // Normal sleep mode for ARM core
<> 149:156823d33999 60 SCB->SCR = 0;
<> 149:156823d33999 61
<> 149:156823d33999 62 __DSB();
<> 149:156823d33999 63 __WFI();
<> 149:156823d33999 64 }
<> 149:156823d33999 65
<> 149:156823d33999 66 static void usb_sleep(void)
<> 149:156823d33999 67 {
<> 149:156823d33999 68 int i;
<> 149:156823d33999 69
<> 149:156823d33999 70 if (MXC_USB->cn & MXC_F_USB_CN_USB_EN) {
<> 149:156823d33999 71 // The USB module will not survive Deep Sleep.
<> 149:156823d33999 72
<> 149:156823d33999 73 // Save the USB state to restore it upon wakeup
<> 149:156823d33999 74 usb_state.dev_cn = MXC_USB->dev_cn;
<> 149:156823d33999 75 usb_state.dev_inten = MXC_USB->dev_inten;
<> 149:156823d33999 76 usb_state.ep_base = MXC_USB->ep_base;
<> 149:156823d33999 77 for (i = 0; i < MXC_USB_NUM_EP; i++) {
<> 149:156823d33999 78 usb_state.ep[i] = MXC_USB->ep[i] & (MXC_F_USB_EP_DIR | MXC_F_USB_EP_BUF2 | MXC_F_USB_EP_INT_EN | MXC_F_USB_EP_NAK_EN);
<> 149:156823d33999 79 }
<> 149:156823d33999 80 restore_usb = 1;
<> 149:156823d33999 81
<> 149:156823d33999 82 // Shut down the USB module.
<> 149:156823d33999 83 MXC_USB->dev_inten = 0;
<> 149:156823d33999 84 MXC_USB->dev_cn = 0;
<> 149:156823d33999 85 MXC_USB->cn = 0;
<> 149:156823d33999 86 restore_usb = 1; // USB should be restored upon wakeup
<> 149:156823d33999 87 } else {
<> 149:156823d33999 88 restore_usb = 0;
<> 149:156823d33999 89 }
<> 149:156823d33999 90 }
<> 149:156823d33999 91
<> 149:156823d33999 92 // Restore the USB module state.
<> 149:156823d33999 93 static void usb_wakeup(void)
<> 149:156823d33999 94 {
<> 149:156823d33999 95 int i;
<> 149:156823d33999 96
<> 149:156823d33999 97 if (restore_usb) {
<> 149:156823d33999 98 MXC_USB->cn = MXC_F_USB_CN_USB_EN;
<> 149:156823d33999 99 MXC_USB->dev_cn = MXC_F_USB_DEV_CN_URST;
<> 149:156823d33999 100 MXC_USB->dev_cn = 0;
<> 149:156823d33999 101 for (i = 0; i < MXC_USB_NUM_EP; i++) {
<> 149:156823d33999 102 MXC_USB->ep[i] = usb_state.ep[i];
<> 149:156823d33999 103 }
<> 149:156823d33999 104 MXC_USB->ep_base = usb_state.ep_base;
<> 149:156823d33999 105 MXC_USB->dev_cn = usb_state.dev_cn;
<> 149:156823d33999 106 MXC_USB->dev_inten = usb_state.dev_inten;
<> 149:156823d33999 107 restore_usb = 0;
<> 149:156823d33999 108 }
<> 149:156823d33999 109 }
<> 149:156823d33999 110
<> 149:156823d33999 111 // Low-power stop mode
<> 160:d5399cc887bb 112 void hal_deepsleep(void)
<> 149:156823d33999 113 {
<> 149:156823d33999 114 unsigned int part_rev = MXC_PWRMAN->mask_id0 & MXC_F_PWRMAN_MASK_ID0_REVISION_ID;
<> 149:156823d33999 115
<> 149:156823d33999 116 // Deep Sleep is not working properly on Revisions A3 and earlier
<> 149:156823d33999 117 if (part_rev <= REVISION_A3) {
AnnaBridge 171:89b338f31ef1 118 hal_sleep();
<> 149:156823d33999 119 return;
<> 149:156823d33999 120 }
<> 149:156823d33999 121
<> 149:156823d33999 122 // Wait for all STDIO characters to be sent. The UART clock will stop.
<> 149:156823d33999 123 while ((stdio_uart->tx_fifo_ctrl & MXC_F_UART_TX_FIFO_CTRL_FIFO_ENTRY) ||
<> 149:156823d33999 124 !(stdio_uart->intfl & MXC_F_UART_INTFL_TX_DONE));
<> 149:156823d33999 125
<> 149:156823d33999 126 __disable_irq();
<> 149:156823d33999 127
<> 149:156823d33999 128 // Do not enter Deep Sleep if connected to VBUS
<> 149:156823d33999 129 if (MXC_USB->dev_intfl & MXC_F_USB_DEV_INTFL_VBUS_ST) {
<> 149:156823d33999 130 __enable_irq();
AnnaBridge 171:89b338f31ef1 131 hal_sleep();
<> 149:156823d33999 132 return;
<> 149:156823d33999 133 }
<> 149:156823d33999 134
<> 149:156823d33999 135 // The USB module will not survive Deep Sleep. Shut it down.
<> 149:156823d33999 136 usb_sleep();
<> 149:156823d33999 137
<> 149:156823d33999 138 // Make sure RTC is not pending before sleeping, if its still synchronizing
<> 149:156823d33999 139 // we might not wake up.
<> 149:156823d33999 140 while (MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
<> 149:156823d33999 141
<> 149:156823d33999 142 // Clear any active GPIO Wake Up Events
<> 149:156823d33999 143 if (MXC_PWRSEQ->flags & MXC_F_PWRSEQ_FLAGS_PWR_IOWAKEUP) {
<> 149:156823d33999 144 // NOTE: These must be cleared before clearing IOWAKEUP
<> 149:156823d33999 145 MXC_PWRSEQ->reg1 |= MXC_F_PWRSEQ_REG1_PWR_CLR_IO_EVENT_LATCH;
<> 149:156823d33999 146 MXC_PWRSEQ->reg1 &= ~MXC_F_PWRSEQ_REG1_PWR_CLR_IO_EVENT_LATCH;
<> 149:156823d33999 147
<> 149:156823d33999 148 MXC_PWRSEQ->flags |= MXC_F_PWRSEQ_FLAGS_PWR_IOWAKEUP;
<> 149:156823d33999 149 }
<> 149:156823d33999 150
<> 149:156823d33999 151 // Set the LP1 select bit so CPU goes to LP1 during SLEEPDEEP
<> 149:156823d33999 152 if (part_rev == REVISION_A4) {
<> 149:156823d33999 153 MXC_PWRSEQ->reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_LP1; // A4 requires part to go to pseudo LP0
<> 149:156823d33999 154 } else {
<> 149:156823d33999 155 MXC_PWRSEQ->reg0 |= MXC_F_PWRSEQ_REG0_PWR_LP1;
<> 149:156823d33999 156 }
<> 149:156823d33999 157
<> 149:156823d33999 158 // The SLEEPDEEP bit will cause a WFE() to trigger LP0/LP1 (depending on ..._REG0_PWR_LP1 state)
<> 149:156823d33999 159 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
<> 149:156823d33999 160
<> 149:156823d33999 161 if (part_rev == REVISION_A4) {
<> 149:156823d33999 162 // WORKAROUND: Toggle SVM bits, which send extra clocks to the power sequencer to fix retention controller
<> 149:156823d33999 163 MXC_PWRSEQ->msk_flags |= MXC_F_PWRSEQ_MSK_FLAGS_PWR_TVDD12_RST_BAD;
<> 149:156823d33999 164 MXC_PWRSEQ->reg0 &= ~(MXC_F_PWRSEQ_REG0_PWR_SVMTVDD12EN_RUN);
<> 149:156823d33999 165 MXC_PWRSEQ->reg0 |= MXC_F_PWRSEQ_REG0_PWR_SVMTVDD12EN_RUN;
<> 149:156823d33999 166 MXC_PWRSEQ->msk_flags &= ~MXC_F_PWRSEQ_MSK_FLAGS_PWR_TVDD12_RST_BAD;
<> 149:156823d33999 167 }
<> 149:156823d33999 168
<> 149:156823d33999 169 // Enable Retention controller
<> 149:156823d33999 170 MXC_PWRSEQ->retn_ctrl0 |= MXC_F_PWRSEQ_RETN_CTRL0_RETN_CTRL_EN;
<> 149:156823d33999 171
<> 149:156823d33999 172 // Clear the firstboot bit, which is generated by a POR event and locks out LPx modes
<> 149:156823d33999 173 MXC_PWRSEQ->reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_FIRST_BOOT;
<> 149:156823d33999 174
<> 149:156823d33999 175 // Freeze GPIO using MBUS so that it doesn't flail while digital core is asleep
<> 149:156823d33999 176 MXC_PWRSEQ->reg1 |= MXC_F_PWRSEQ_REG1_PWR_MBUS_GATE;
<> 149:156823d33999 177
<> 149:156823d33999 178 // Dummy read to make sure SSB writes are complete
<> 149:156823d33999 179 MXC_PWRSEQ->reg0 = MXC_PWRSEQ->reg0;
<> 149:156823d33999 180
<> 149:156823d33999 181 if (part_rev == REVISION_A4) {
<> 149:156823d33999 182 // Note: ARM deep-sleep requires a specific sequence to clear event latches,
<> 149:156823d33999 183 // otherwise the CPU will not enter sleep.
<> 149:156823d33999 184 __SEV();
<> 149:156823d33999 185 __WFE();
<> 149:156823d33999 186 __WFI();
<> 149:156823d33999 187 } else {
<> 149:156823d33999 188 // Note: ARM deep-sleep requires a specific sequence to clear event latches,
<> 149:156823d33999 189 // otherwise the CPU will not enter sleep.
<> 149:156823d33999 190 __SEV();
<> 149:156823d33999 191 __WFE();
<> 149:156823d33999 192 __WFE();
<> 149:156823d33999 193 }
<> 149:156823d33999 194
<> 149:156823d33999 195 // We'll wakeup here ...
<> 149:156823d33999 196
<> 149:156823d33999 197 // Unfreeze the GPIO by clearing MBUS_GATE
<> 149:156823d33999 198 MXC_PWRSEQ->reg1 &= ~MXC_F_PWRSEQ_REG1_PWR_MBUS_GATE;
<> 149:156823d33999 199
<> 149:156823d33999 200 usb_wakeup();
<> 149:156823d33999 201
<> 149:156823d33999 202 // Clear power sequencer event flags (write-1-to-clear)
<> 149:156823d33999 203 // RTC and GPIO flags are cleared in their interrupts handlers
<> 149:156823d33999 204 // NOTE: We are ignoring all of these potential wake up types
<> 149:156823d33999 205 MXC_PWRSEQ->flags = (MXC_F_PWRSEQ_FLAGS_PWR_POWER_FAIL |
<> 149:156823d33999 206 MXC_F_PWRSEQ_FLAGS_PWR_BOOT_FAIL |
<> 149:156823d33999 207 MXC_F_PWRSEQ_FLAGS_PWR_FLASH_DISCHARGE |
<> 149:156823d33999 208 MXC_F_PWRSEQ_FLAGS_PWR_VDD12_RST_BAD |
<> 149:156823d33999 209 MXC_F_PWRSEQ_FLAGS_PWR_VDD18_RST_BAD |
<> 149:156823d33999 210 MXC_F_PWRSEQ_FLAGS_PWR_VRTC_RST_BAD |
<> 149:156823d33999 211 MXC_F_PWRSEQ_FLAGS_PWR_VDDB_RST_BAD |
<> 149:156823d33999 212 MXC_F_PWRSEQ_FLAGS_PWR_TVDD12_RST_BAD |
<> 149:156823d33999 213 MXC_F_PWRSEQ_FLAGS_PWR_POR18Z_FAIL_LATCH |
<> 149:156823d33999 214 MXC_F_PWRSEQ_FLAGS_PWR_USB_PLUG_WAKEUP |
<> 149:156823d33999 215 MXC_F_PWRSEQ_FLAGS_PWR_USB_REMOVE_WAKEUP |
<> 149:156823d33999 216 MXC_F_PWRSEQ_FLAGS_PWR_TVDD12_BAD);
<> 149:156823d33999 217
<> 149:156823d33999 218 __enable_irq();
<> 149:156823d33999 219 }