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106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/*
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* Copyright (C) 2018 Gunar Schorcht
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_esp32
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* @ingroup drivers_periph_pm
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* @{
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*
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* @file
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* @brief Implementation of power management functions
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*
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* @author Gunar Schorcht <gunar@schorcht.net>
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* @}
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*/
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#define ENABLE_DEBUG (0)
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#include "debug.h"
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#include "esp_attr.h"
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#include "syscalls.h"
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#include "rom/rtc.h"
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#include "rom/uart.h"
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#include "soc/rtc.h"
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#include "soc/rtc_cntl_reg.h"
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void pm_set_lowest(void)
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{
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DEBUG ("%s enter to sleep @%u\n", __func__, system_get_time());
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#if !defined(QEMU)
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/* passive wait for interrupt to leave lowest power mode */
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__asm__ volatile ("waiti 0");
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/* reset system watchdog timer */
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system_wdt_feed();
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#endif
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DEBUG ("%s exit from sleep @%u\n", __func__, system_get_time());
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}
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void IRAM_ATTR pm_off(void)
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{
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DEBUG ("%s\n", __func__);
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/* suspend UARTs */
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for (int i = 0; i < 3; ++i) {
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REG_SET_BIT(UART_FLOW_CONF_REG(i), UART_FORCE_XOFF);
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uart_tx_wait_idle(i);
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}
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/* set all power down flags */
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uint32_t pd_flags = RTC_SLEEP_PD_DIG |
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RTC_SLEEP_PD_RTC_PERIPH |
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RTC_SLEEP_PD_RTC_SLOW_MEM |
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RTC_SLEEP_PD_RTC_FAST_MEM |
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RTC_SLEEP_PD_RTC_MEM_FOLLOW_CPU |
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RTC_SLEEP_PD_VDDSDIO;
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rtc_sleep_config_t config = RTC_SLEEP_CONFIG_DEFAULT(pd_flags);
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config.wifi_pd_en = 1;
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config.rom_mem_pd_en = 1;
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config.lslp_meminf_pd = 1;
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/* Save current frequency and switch to XTAL */
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rtc_cpu_freq_t cpu_freq = rtc_clk_cpu_freq_get();
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rtc_clk_cpu_freq_set(RTC_CPU_FREQ_XTAL);
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/* set deep sleep duration to forever */
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rtc_sleep_set_wakeup_time(rtc_time_get() + ~0x0UL);
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/* configure deep sleep */
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rtc_sleep_init(config);
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rtc_sleep_start(RTC_TIMER_TRIG_EN, 0);
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/* Restore CPU frequency */
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rtc_clk_cpu_freq_set(cpu_freq);
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/* resume UARTs */
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for (int i = 0; i < 3; ++i) {
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REG_CLR_BIT(UART_FLOW_CONF_REG(i), UART_FORCE_XOFF);
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REG_SET_BIT(UART_FLOW_CONF_REG(i), UART_FORCE_XON);
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REG_CLR_BIT(UART_FLOW_CONF_REG(i), UART_FORCE_XON);
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}
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}
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extern void esp_restart_noos(void) __attribute__ ((noreturn));
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void pm_reboot(void)
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{
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DEBUG ("%s\n", __func__);
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/* suspend and flush UARTs */
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for (int i = 0; i < 3; ++i) {
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REG_SET_BIT(UART_FLOW_CONF_REG(i), UART_FORCE_XOFF);
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uart_tx_wait_idle(i);
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}
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software_reset();
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}
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