USB Serial application
Fork of USBSerial_HelloWorld by
mbed-dev/targets/TARGET_Maxim/TARGET_MAX32600/sleep.c
- Committer:
- Zaitsev
- Date:
- 2017-01-10
- Revision:
- 10:41552d038a69
File content as of revision 10:41552d038a69:
/******************************************************************************* * Copyright (C) 2015 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 "cmsis.h" #include "pwrman_regs.h" #include "pwrseq_regs.h" #include "ioman_regs.h" #include "rtc_regs.h" static mxc_uart_regs_t *stdio_uart = (mxc_uart_regs_t*)STDIO_UART; // Normal wait mode void sleep(void) { // Normal sleep mode for ARM core SCB->SCR = 0; __DSB(); __WFI(); } // Work-around for issue of clearing power sequencer I/O flag static void clearAllGPIOWUD(void) { uint32_t wud_req0 = MXC_IOMAN->wud_req0; uint32_t wud_req1 = MXC_IOMAN->wud_req1; // I/O must be a wakeup detect to clear MXC_IOMAN->wud_req0 = 0xffffffff; MXC_IOMAN->wud_req1 = 0xffffffff; // Clear all WUDs 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; MXC_PWRMAN->wud_pulse0 = 1; // Restore WUD requests MXC_IOMAN->wud_req0 = wud_req0; MXC_IOMAN->wud_req1 = wud_req1; } // Low-power stop mode void deepsleep(void) { __disable_irq(); // Wait for all STDIO characters to be sent. The UART clock will stop. while (stdio_uart->status & MXC_F_UART_STATUS_TX_BUSY); // Prepare for LP1 uint32_t reg0 = MXC_PWRSEQ->reg0; reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_SVM3EN_SLP; // disable VDD3 SVM during sleep mode reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_SVM1EN_SLP; // disable VREG18 SVM during sleep mode if (reg0 & MXC_F_PWRSEQ_REG0_PWR_RTCEN_RUN) { // if real-time clock enabled during run reg0 |= MXC_F_PWRSEQ_REG0_PWR_RTCEN_SLP; // enable real-time clock during sleep mode } else { reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_RTCEN_SLP; // disable real-time clock during sleep mode } reg0 |= MXC_F_PWRSEQ_REG0_PWR_CHZYEN_SLP; // enable CHZY regulator during sleep mode reg0 |= MXC_F_PWRSEQ_REG0_PWR_LP1; // go into LP1 reg0 &= ~MXC_F_PWRSEQ_REG0_PWR_FIRST_BOOT; // clear first boot flag MXC_PWRSEQ->reg0 = reg0; MXC_PWRSEQ->reg3 = (MXC_PWRSEQ->reg3 & ~MXC_F_PWRSEQ_REG3_PWR_ROSEL_QUICK) | (3 << MXC_F_PWRSEQ_REG3_PWR_ROSEL_QUICK_POS); // Deep sleep for ARM core SCB->SCR = SCB_SCR_SLEEPDEEP_Msk; // clear latches for wakeup detect MXC_PWRSEQ->flags = MXC_PWRSEQ->flags; if (MXC_PWRSEQ->flags & MXC_F_PWRSEQ_FLAGS_PWR_IO_WAKEUP) { // attempt work-around for I/O flag clearing issue clearAllGPIOWUD(); MXC_PWRSEQ->flags = MXC_F_PWRSEQ_FLAGS_PWR_IO_WAKEUP; } // Wait for pending RTC transaction while (MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING); // Ensure that the event register is clear __SEV(); // set event __WFE(); // clear event // Enter LP1 __WFE(); // Woke up from LP1 // The RTC timer does not update until the next tick uint32_t temp = MXC_RTCTMR->timer; while (MXC_RTCTMR->timer == temp); __enable_irq(); }