Hi Everyone,
I’m encountering an issue where my device fails to stay in deep sleep mode. Immediately after entering deep sleep, the MCU wakes up again, despite there being no motion detected. The reset reason displayed is: 09:49:13.485 → 65536 (0x10000).
Currently, nothing is connected to the MCU; I’m using just the bare XIAO NRF SENSE board.
My setup includes a XIAO NRF running mbed 2.9.0 and a double tap example. Any insights on what might be causing this behavior would be greatly appreciated.
Thank you!
/*****************************************************************************/
// IMU Interrupt Example for XIAO BLE Sense
// This example shows how to configure LMSD6S3TR-C on XIAO BLE SENSE to interrupt
// on INT1 after a "Double Tap" was recognized.
// Additionally, the device goes into System OFF state, after 5 interrupts were
// received. Another "Double Tap" will wake up the device again.
//
// Original by chuck
//poatched and toasted by pjg
/*******************************************************************************/
#include "LSM6DS3.h"
#include "Wire.h"
LSM6DS3 myIMU(I2C_MODE, 0x6A); // IMU
#define int1Pin PIN_LSM6DS3TR_C_INT1
// OLEDs without Reset of the Display
const int buttonPin = 1; // the number of the pushbutton pin
int buttonState = 0; // variable for reading the pushbutton status
int BuzzerPin = A3;
uint8_t interruptCount = 0; // Amount of received interrupts
uint8_t prevInterruptCount = 0; // Interrupt Counter from last loop
void setup() {
Serial.begin(9600);
delay(1000); //relax...
Serial.println("Processor came out of reset.\n");
pinMode(LED_BUILTIN, OUTPUT);// initialize the LED pin as an output:
pinMode(buttonPin, INPUT_PULLUP);// initialize the pushbutton pin as an input:
pinMode(BuzzerPin, OUTPUT);
pinMode(LEDR, OUTPUT);
pinMode(LEDG, OUTPUT);
pinMode(LEDB, OUTPUT);
setLedRGB(false, false, true); // set blue led
myIMU.settings.gyroEnabled = 0; // Gyro currently not used, disabled to save power
if (myIMU.begin() != 0) {
Serial.println("IMU error");
} else {
Serial.println("IMU OK!");
}
setupDoubleTapInterrupt();
pinMode(int1Pin, INPUT);
attachInterrupt(digitalPinToInterrupt(int1Pin), int1ISR, RISING);
/*
WATCHDOG TIMER FOR AUTO RESET
NRF_WDT->CONFIG = (WDT_CONFIG_HALT_Pause << WDT_CONFIG_HALT_Pos) | ( WDT_CONFIG_SLEEP_Run << WDT_CONFIG_SLEEP_Pos);
NRF_WDT->CRV = 60*32768; // 2 sec. timout
NRF_WDT->TASKS_START = 1;
NRF_WDT->RR[0] = WDT_RR_RR_Reload; //Reload watchdog register 0.
*/
}
int i = 0;
void loop() {
delay(5000);
int32_t reset_reason = 0;
reset_reason = NRF_POWER->RESETREAS;
Serial.println(reset_reason);
if(i == 2)
{
NRF_POWER->RESETREAS = 0xFFFFFFFF; // Write to clear the reset reasons
}
setLedRGB(false, false, true); // reset led to blue only
Serial.print("\Iterrupt Counter: ");
Serial.println(interruptCount);
// if interrupt was received in this cycle
if (interruptCount > prevInterruptCount) {
Serial.println("\Interrupt received!");
setLedRGB(false, true, false); // set green only
}
prevInterruptCount = interruptCount;
if (interruptCount >= 5) {
// Trigger System OFF after 5 interrupts
goToPowerOff();
}
delay(500);
}
// -------------------- System ------------------------- //
void goToPowerOff() {
setLedRGB(false, false, false);
Serial.println("Going to System OFF");
setupDoubleTapInterrupt(); // not needed here, if already applied..
delay(1000); // delay seems important to apply settings, before going to System OFF
//Ensure interrupt pin from IMU is set to wake up device
nrf_gpio_cfg_sense_input(digitalPinToInterrupt(int1Pin), NRF_GPIO_PIN_PULLDOWN, NRF_GPIO_PIN_SENSE_HIGH);
// Trigger System OFF
NRF_POWER->SYSTEMOFF = 1;
}
// -------------------- Interrupts ------------------------- //
void setupDoubleTapInterrupt() {
uint8_t error = 0;
uint8_t dataToWrite = 0;
// Double Tap Config
myIMU.writeRegister(LSM6DS3_ACC_GYRO_CTRL1_XL, 0x60); //* Acc = 416Hz (High-Performance mode)// Turn on the accelerometer
// ODR_XL = 416 Hz, FS_XL = 2g
myIMU.writeRegister(LSM6DS3_ACC_GYRO_TAP_CFG1, 0x8E);// INTERRUPTS_ENABLE, SLOPE_FDS// Enable interrupts and tap detection on X, Y, Z-axis
myIMU.writeRegister(LSM6DS3_ACC_GYRO_TAP_THS_6D, 0x85);// Set tap threshold 8C
myIMU.writeRegister(LSM6DS3_ACC_GYRO_INT_DUR2, 0x7F);// Set Duration, Quiet and Shock time windows 7F
myIMU.writeRegister(LSM6DS3_ACC_GYRO_WAKE_UP_THS, 0x80);// Single & double-tap enabled (SINGLE_DOUBLE_TAP = 1)
myIMU.writeRegister(LSM6DS3_ACC_GYRO_MD1_CFG, 0x08);// Double-tap interrupt driven to INT1 pin
}
void int1ISR()
{
interruptCount++;
;
}
// -------------------- Utilities ------------------------- //
void setLedRGB(bool red, bool green, bool blue) {
if (!blue) { digitalWrite(LEDB, HIGH); } else { digitalWrite(LEDB, LOW); }
if (!green) { digitalWrite(LEDG, HIGH); } else { digitalWrite(LEDG, LOW); }
if (!red) { digitalWrite(LEDR, HIGH); } else { digitalWrite(LEDR, LOW); }
}```