USB Serial application
Fork of USBSerial_HelloWorld by
mbed-dev/targets/TARGET_Maxim/TARGET_MAX32620/sleep.c
- Committer:
- Zaitsev
- Date:
- 2017-01-10
- Revision:
- 10:41552d038a69
File content as of revision 10:41552d038a69:
/******************************************************************************* * Copyright (C) 2016 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 "sleep_api.h" #include "pwrman_regs.h" #include "pwrseq_regs.h" #include "clkman_regs.h" #include "ioman_regs.h" #include "rtc_regs.h" #include "usb_regs.h" #define REVISION_A3 2 #define REVISION_A4 3 // USB state to be restored upon wakeup typedef struct { uint32_t dev_cn; uint32_t dev_inten; uint32_t ep_base; uint32_t ep[MXC_USB_NUM_EP]; } usb_state_t; static mxc_uart_regs_t *stdio_uart = (mxc_uart_regs_t*)STDIO_UART; static int restore_usb; static usb_state_t usb_state; void sleep(void) { // Normal sleep mode for ARM core SCB->SCR = 0; __DSB(); __WFI(); } static void usb_sleep(void) { int i; if (MXC_USB->cn & MXC_F_USB_CN_USB_EN) { // The USB module will not survive Deep Sleep. // Save the USB state to restore it upon wakeup usb_state.dev_cn = MXC_USB->dev_cn; usb_state.dev_inten = MXC_USB->dev_inten; usb_state.ep_base = MXC_USB->ep_base; for (i = 0; i < MXC_USB_NUM_EP; i++) { 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); } restore_usb = 1; // Shut down the USB module. MXC_USB->dev_inten = 0; MXC_USB->dev_cn = 0; MXC_USB->cn = 0; restore_usb = 1; // USB should be restored upon wakeup } else { restore_usb = 0; } } // Restore the USB module state. static void usb_wakeup(void) { int i; if (restore_usb) { MXC_USB->cn = MXC_F_USB_CN_USB_EN; MXC_USB->dev_cn = MXC_F_USB_DEV_CN_URST; MXC_USB->dev_cn = 0; for (i = 0; i < MXC_USB_NUM_EP; i++) { MXC_USB->ep[i] = usb_state.ep[i]; } MXC_USB->ep_base = usb_state.ep_base; MXC_USB->dev_cn = usb_state.dev_cn; MXC_USB->dev_inten = usb_state.dev_inten; restore_usb = 0; } } // Low-power stop mode void deepsleep(void) { unsigned int part_rev = MXC_PWRMAN->mask_id0 & MXC_F_PWRMAN_MASK_ID0_REVISION_ID; // Deep Sleep is not working properly on Revisions A3 and earlier if (part_rev <= REVISION_A3) { sleep(); return; } // Wait for all STDIO characters to be sent. The UART clock will stop. while ((stdio_uart->tx_fifo_ctrl & MXC_F_UART_TX_FIFO_CTRL_FIFO_ENTRY) || !(stdio_uart->intfl & MXC_F_UART_INTFL_TX_DONE)); __disable_irq(); // Do not enter Deep Sleep if connected to VBUS if (MXC_USB->dev_intfl & MXC_F_USB_DEV_INTFL_VBUS_ST) { __enable_irq(); sleep(); return; } // The USB module will not survive Deep Sleep. Shut it down. usb_sleep(); // Make sure RTC is not pending before sleeping, if its still synchronizing // we might not wake up. while (MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING); // Clear any active GPIO Wake Up Events if (MXC_PWRSEQ->flags & MXC_F_PWRSEQ_FLAGS_PWR_IOWAKEUP) { // NOTE: These must be cleared before clearing IOWAKEUP MXC_PWRSEQ->reg1 |= MXC_F_PWRSEQ_REG1_PWR_CLR_IO_EVENT_LATCH; MXC_PWRSEQ->reg1 &= ~MXC_F_PWRSEQ_REG1_PWR_CLR_IO_EVENT_LATCH; MXC_PWRSEQ->flags |= MXC_F_PWRSEQ_FLAGS_PWR_IOWAKEUP; } // Set the LP1 select bit so CPU goes to LP1 during SLEEPDEEP if (part_rev == REVISION_A4) { MXC_PWRSEQ->reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_LP1; // A4 requires part to go to pseudo LP0 } else { MXC_PWRSEQ->reg0 |= MXC_F_PWRSEQ_REG0_PWR_LP1; } // The SLEEPDEEP bit will cause a WFE() to trigger LP0/LP1 (depending on ..._REG0_PWR_LP1 state) SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk; if (part_rev == REVISION_A4) { // WORKAROUND: Toggle SVM bits, which send extra clocks to the power sequencer to fix retention controller MXC_PWRSEQ->msk_flags |= MXC_F_PWRSEQ_MSK_FLAGS_PWR_TVDD12_RST_BAD; MXC_PWRSEQ->reg0 &= ~(MXC_F_PWRSEQ_REG0_PWR_SVMTVDD12EN_RUN); MXC_PWRSEQ->reg0 |= MXC_F_PWRSEQ_REG0_PWR_SVMTVDD12EN_RUN; MXC_PWRSEQ->msk_flags &= ~MXC_F_PWRSEQ_MSK_FLAGS_PWR_TVDD12_RST_BAD; } // Enable Retention controller MXC_PWRSEQ->retn_ctrl0 |= MXC_F_PWRSEQ_RETN_CTRL0_RETN_CTRL_EN; // Clear the firstboot bit, which is generated by a POR event and locks out LPx modes MXC_PWRSEQ->reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_FIRST_BOOT; // Freeze GPIO using MBUS so that it doesn't flail while digital core is asleep MXC_PWRSEQ->reg1 |= MXC_F_PWRSEQ_REG1_PWR_MBUS_GATE; // Dummy read to make sure SSB writes are complete MXC_PWRSEQ->reg0 = MXC_PWRSEQ->reg0; if (part_rev == REVISION_A4) { // Note: ARM deep-sleep requires a specific sequence to clear event latches, // otherwise the CPU will not enter sleep. __SEV(); __WFE(); __WFI(); } else { // Note: ARM deep-sleep requires a specific sequence to clear event latches, // otherwise the CPU will not enter sleep. __SEV(); __WFE(); __WFE(); } // We'll wakeup here ... // Unfreeze the GPIO by clearing MBUS_GATE MXC_PWRSEQ->reg1 &= ~MXC_F_PWRSEQ_REG1_PWR_MBUS_GATE; usb_wakeup(); // Clear power sequencer event flags (write-1-to-clear) // RTC and GPIO flags are cleared in their interrupts handlers // NOTE: We are ignoring all of these potential wake up types MXC_PWRSEQ->flags = (MXC_F_PWRSEQ_FLAGS_PWR_POWER_FAIL | MXC_F_PWRSEQ_FLAGS_PWR_BOOT_FAIL | MXC_F_PWRSEQ_FLAGS_PWR_FLASH_DISCHARGE | MXC_F_PWRSEQ_FLAGS_PWR_VDD12_RST_BAD | MXC_F_PWRSEQ_FLAGS_PWR_VDD18_RST_BAD | MXC_F_PWRSEQ_FLAGS_PWR_VRTC_RST_BAD | MXC_F_PWRSEQ_FLAGS_PWR_VDDB_RST_BAD | MXC_F_PWRSEQ_FLAGS_PWR_TVDD12_RST_BAD | MXC_F_PWRSEQ_FLAGS_PWR_POR18Z_FAIL_LATCH | MXC_F_PWRSEQ_FLAGS_PWR_USB_PLUG_WAKEUP | MXC_F_PWRSEQ_FLAGS_PWR_USB_REMOVE_WAKEUP | MXC_F_PWRSEQ_FLAGS_PWR_TVDD12_BAD); __enable_irq(); }