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fix i2c, add deep sleep

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This commit is contained in:
Thaddeus Hughes
2026-04-28 12:43:43 -05:00
parent ef1f3e4e85
commit 666750f710
25 changed files with 2163 additions and 1196 deletions
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83
main/rtc.c
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@@ -19,6 +19,7 @@
#include "esp_timer.h"
#include "i2c.h"
#include "driver/gpio.h"
#include "driver/rtc_io.h"
#include "rtc_wdt.h"
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
@@ -33,6 +34,9 @@
#define PIN_BTN_INTERRUPT GPIO_NUM_13
#define RTC_NVS_NAMESPACE "hw"
#define RTC_NVS_KEY "rtc_time"
// Return microseconds from the RTC hardware timer.
// Used ONLY in rtc_restore_time() for crash-recovery (survives panics/WDT via RTC domain).
// RC oscillator drift (~150 kHz, ±5%) is negligible over a <30s crash restart (~1.5s worst case).
@@ -104,6 +108,82 @@ void soft_idle_exit(void)
rtc_reset_shutdown_timer();
}
void hibernate_enter(void)
{
ESP_LOGI("RTC", "Entering hibernate (deep sleep, EXT0 button wake, RTC discarded)");
/* Reuse the soft-idle teardown:
* - sets in_soft_idle = true, which gates the main-task LED loop and
* the FSM's drive_relays() so neither overwrites our pre-sleep
* output state during the wait-for-button-release window;
* - stops webserver + BT;
* - drives LEDs to 0 and writes i2c_relays_sleep() (sensor rail off,
* all bridges off). */
soft_idle_enter();
/* Discard saved RTC time so the next boot comes up with rtc_set=false.
* RTC slow memory keeps its contents across deep sleep on ESP32 (the
* RTC clock and slow-mem domain stay alive for EXT0 to work), so we
* also zero the RTC_DATA_ATTR globals here. Together with the NVS
* erase, this guarantees the next boot has no surviving time state. */
nvs_handle_t h;
if (nvs_open(RTC_NVS_NAMESPACE, NVS_READWRITE, &h) == ESP_OK) {
nvs_erase_key(h, RTC_NVS_KEY);
nvs_commit(h);
nvs_close(h);
}
rtc_set = false;
sync_unix_us = 0;
sync_rtc_us = 0;
next_alarm_time_s = -1;
/* If the operator is still pressing the button (web-UI path: they
* shouldn't be; cmd-line path: maybe), wait for release. The button
* is on NCA9535 P00; GPIO13 is the chip's INT line, which only
* pulses low on input changes — so we MUST read the actual button
* state via I2C, not the GPIO level. Capped so we don't loop forever. */
int waited_ms = 0;
while (i2c_button_held_raw(0) && waited_ms < 5000) {
vTaskDelay(pdMS_TO_TICKS(50));
waited_ms += 50;
}
vTaskDelay(pdMS_TO_TICKS(100));
/* Final TCA9555/NCA9535 write right before we halt the CPU — covers
* any stale-state edge cases (e.g. a write that snuck in before the
* FSM gate latched). */
i2c_set_led1(0);
i2c_relays_sleep();
/* Read NCA9535 INPUT0 to clear any pending INT (which would hold
* GPIO13 low and instantly satisfy our EXT0 wake-on-zero condition).
* i2c_button_held_raw() does the read as a side effect. */
(void)i2c_button_held_raw(0);
/* Clear any lingering wake sources from earlier configuration before
* enabling the only one we want. */
esp_sleep_disable_wakeup_source(ESP_SLEEP_WAKEUP_ALL);
/* GPIO13 carries the NCA9535 INT line (open-drain, asserts low on any
* input change, clears on INPUT0 read). EXT0 wake on level=0 fires
* the moment the user presses the button — INT pulls low, ESP wakes,
* the post-boot i2c_poll_buttons() read clears INT. */
esp_sleep_enable_ext0_wakeup(PIN_BTN_INTERRUPT, 0);
rtc_gpio_pullup_en(PIN_BTN_INTERRUPT);
rtc_gpio_pulldown_dis(PIN_BTN_INTERRUPT);
/* Note: we deliberately do NOT call esp_sleep_pd_config(... OFF). On
* ESP-IDF v5.3 that path is reference-counted and asserts when the
* counter would go negative; since nothing has previously called ON
* for these domains, OFF would abort. ESP-IDF picks the deepest
* compatible power state automatically given the wake source we set. */
ESP_LOGI("RTC", "esp_deep_sleep_start int_level=%d btn=%d",
gpio_get_level(PIN_BTN_INTERRUPT),
(int)i2c_button_held_raw(0));
esp_deep_sleep_start(); /* never returns */
}
int64_t rtc_get_s(void)
{
if (!rtc_set) return 0;
@@ -132,9 +212,6 @@ void rtc_set_s(int64_t tv_sec)
(long long)(esp_timer_get_time() / 1000000ULL));
}
#define RTC_NVS_NAMESPACE "hw"
#define RTC_NVS_KEY "rtc_time"
void rtc_save_time(void)
{
if (!rtc_set) return;