USB Serial application
Fork of USBSerial_HelloWorld by
Diff: mbed-dev/targets/TARGET_Maxim/TARGET_MAX32610/sleep.c
- Revision:
- 10:41552d038a69
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/targets/TARGET_Maxim/TARGET_MAX32610/sleep.c Tue Jan 10 20:42:26 2017 +0000 @@ -0,0 +1,123 @@ +/******************************************************************************* + * 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(); +}