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esp8266: Implement basic deep-sleep capabilities.

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Use the machine.deepsleep() function to enter the sleep mode.  Use the
RTC to configure the alarm to wake the device.

Basic use is the following:

    import machine

    # configure RTC's ALARM0 to wake device from deep sleep
    rtc = machine.RTC()
    rtc.irq(trigger=rtc.ALARM0, wake=machine.DEEPSLEEP)

    # do other things
    # ...

    # set ALARM0's alarm to wake after 10 seconds
    rtc.alarm(rtc.ALARM0, 10000)

    # enter deep-sleep state (system is reset upon waking)
    machine.deepsleep()

To detect if the system woke from a deep sleep use:

    if machine.reset_cause() == machine.DEEPSLEEP_RESET:
        print('woke from deep sleep')
This commit is contained in:
Damien George
2016-04-21 11:43:37 +01:00
parent 2a51f72ed1
commit 32d7cf6e44
3 changed files with 101 additions and 0 deletions
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50
esp8266/modmachine.c
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@@ -33,14 +33,20 @@
#include "extmod/machine_i2c.h"
#include "utils.h"
#include "modpyb.h"
#include "modpybrtc.h"
#include "os_type.h"
#include "osapi.h"
#include "etshal.h"
#include "ets_alt_task.h"
#include "user_interface.h"
#if MICROPY_PY_MACHINE
//#define MACHINE_WAKE_IDLE (0x01)
//#define MACHINE_WAKE_SLEEP (0x02)
#define MACHINE_WAKE_DEEPSLEEP (0x04)
STATIC mp_obj_t machine_freq(mp_uint_t n_args, const mp_obj_t *args) {
if (n_args == 0) {
// get
@@ -75,6 +81,40 @@ STATIC mp_obj_t machine_unique_id(void) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_unique_id_obj, machine_unique_id);
STATIC mp_obj_t machine_deepsleep(void) {
// default to sleep forever
uint32_t sleep_us = 0;
// see if RTC.ALARM0 should wake the device
if (pyb_rtc_alarm0_wake & MACHINE_WAKE_DEEPSLEEP) {
uint64_t t = pyb_rtc_get_us_since_2000();
if (pyb_rtc_alarm0_expiry <= t) {
sleep_us = 1; // alarm already expired so wake immediately
} else {
uint64_t delta = pyb_rtc_alarm0_expiry - t;
if (delta <= 0xffffffff) {
// sleep for the desired time
sleep_us = delta;
} else {
// overflow, just set to maximum sleep time
sleep_us = 0xffffffff;
}
}
}
// put the device in a deep-sleep state
system_deep_sleep_set_option(0); // default power down mode; TODO check this
system_deep_sleep(sleep_us);
for (;;) {
// we must not return
ets_loop_iter();
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_deepsleep_obj, machine_deepsleep);
typedef struct _esp_timer_obj_t {
mp_obj_base_t base;
os_timer_t timer;
@@ -160,7 +200,9 @@ STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR_reset), MP_ROM_PTR(&machine_reset_obj) },
{ MP_ROM_QSTR(MP_QSTR_reset_cause), MP_ROM_PTR(&machine_reset_cause_obj) },
{ MP_ROM_QSTR(MP_QSTR_unique_id), MP_ROM_PTR(&machine_unique_id_obj) },
{ MP_ROM_QSTR(MP_QSTR_deepsleep), MP_ROM_PTR(&machine_deepsleep_obj) },
{ MP_ROM_QSTR(MP_QSTR_RTC), MP_ROM_PTR(&pyb_rtc_type) },
{ MP_ROM_QSTR(MP_QSTR_Timer), MP_ROM_PTR(&esp_timer_type) },
{ MP_ROM_QSTR(MP_QSTR_Pin), MP_ROM_PTR(&pyb_pin_type) },
{ MP_ROM_QSTR(MP_QSTR_PWM), MP_ROM_PTR(&pyb_pwm_type) },
@@ -168,6 +210,14 @@ STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&pyb_uart_type) },
{ MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&machine_i2c_type) },
{ MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&pyb_spi_type) },
// wake abilities
{ MP_ROM_QSTR(MP_QSTR_DEEPSLEEP), MP_ROM_INT(MACHINE_WAKE_DEEPSLEEP) },
// reset causes
{ MP_ROM_QSTR(MP_QSTR_PWR_ON_RESET), MP_ROM_INT(REASON_EXT_SYS_RST) },
{ MP_ROM_QSTR(MP_QSTR_HARD_RESET), MP_ROM_INT(REASON_EXT_SYS_RST) },
{ MP_ROM_QSTR(MP_QSTR_DEEPSLEEP_RESET), MP_ROM_INT(REASON_DEEP_SLEEP_AWAKE) },
};
STATIC MP_DEFINE_CONST_DICT(machine_module_globals, machine_module_globals_table);