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Fix #115: wake from light sleep if a character arrives on the serial port

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Note - we do this not by using the uart wake feature, but by the lower
power GPIO edge feature.  Recommend sending "Z" 0x5A - because that has
many edges.  Send the character 4 times to make sure the device is awake
This commit is contained in:
geeksville 2020-06-10 14:36:11 -07:00
parent ddfdae64bf
commit 8ccd59a7d8
3 changed files with 20 additions and 1 deletions
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5
src/PowerFSM.cpp
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@ -62,8 +62,13 @@ static void lsIdle()
secsSlept += sleepTime;
// DEBUG_MSG("sleeping, flash led!\n");
}
if (wakeCause == ESP_SLEEP_WAKEUP_UART) {
// Not currently used (because uart triggers in hw have problems)
powerFSM.trigger(EVENT_SERIAL_CONNECTED);
} else {
// We woke for some other reason (button press, uart, device interrupt)
//uint64_t status = esp_sleep_get_ext1_wakeup_status();
DEBUG_MSG("wakeCause %d\n", wakeCause);
#ifdef BUTTON_PIN

3
src/configuration.h
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@ -258,7 +258,10 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#ifdef NO_ESP32
#define USE_SEGGER
#else
#define SERIAL0_RX_GPIO 3 // Always GPIO3 on ESP32
#endif
#ifdef USE_SEGGER
#include "SEGGER_RTT.h"
#define DEBUG_MSG(...) SEGGER_RTT_printf(0, __VA_ARGS__)

13
src/sleep.cpp
View File

@ -14,6 +14,7 @@
#include "esp_pm.h"
#include "rom/rtc.h"
#include <driver/rtc_io.h>
#include <driver/uart.h>
#include "BluetoothUtil.h"
@ -111,7 +112,6 @@ void initDeepSleep()
#endif
}
bool doPreflightSleep()
{
if (preflightSleep.notifyObservers(NULL) != 0)
@ -257,6 +257,17 @@ esp_sleep_wakeup_cause_t doLightSleep(uint64_t sleepMsec) // FIXME, use a more r
gpio_pullup_en((gpio_num_t)BUTTON_PIN);
#endif
#ifdef SERIAL0_RX_GPIO
// We treat the serial port as a GPIO for a fast/low power way of waking, if we see a rising edge that means
// someone started to send something
// Alas - doesn't work reliably, instead need to use the uart specific version (which burns a little power)
// FIXME: gpio 3 is RXD for serialport 0 on ESP32
// Send a few Z characters to wake the port
gpio_wakeup_enable((gpio_num_t)SERIAL0_RX_GPIO, GPIO_INTR_LOW_LEVEL);
// uart_set_wakeup_threshold(UART_NUM_0, 3);
// esp_sleep_enable_uart_wakeup(0);
#endif
#ifdef BUTTON_PIN
gpio_wakeup_enable((gpio_num_t)BUTTON_PIN, GPIO_INTR_LOW_LEVEL); // when user presses, this button goes low
#endif