main.cpp

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#include "main.h"
 
#include <Adafruit_LIS3DH.h>
#include <Adafruit_Sensor.h>
#include <Arduino.h>
#include <SPI.h>
 
static SPIClass lis_spi(FSPI);
static Adafruit_LIS3DH lis(LIS3DH_CS_PIN, &lis_spi);
static volatile bool g_interrupt_flag = false;
 
void IRAM_ATTR onInterrupt() {
    g_interrupt_flag = true;
}
 
void setup() {
    Serial.begin(115200);
    while (!Serial)
        delay(10);
 
    Serial.println("LIS3DH firmware starting...");
 
    lis_spi.begin(LIS3DH_CLK_PIN, LIS3DH_MISO_PIN, LIS3DH_MOSI_PIN,
                  LIS3DH_CS_PIN);
 
    if (!lis.begin()) {
        Serial.println("ERROR: LIS3DH not found. Check wiring!");
        while (1)
            delay(100);
    }
 
    lis.setDataRate(ACCEL_ODR);
    lis.setRange(ACCEL_RANGE);
 
    lis.configureHighGInterrupt(INT1_THS_VALUE, INT1_DUR_VALUE);
 
    pinMode(LIS3DH_INT1_PIN, INPUT);
    attachInterrupt(digitalPinToInterrupt(LIS3DH_INT1_PIN), onInterrupt,
                    RISING);
 
    Serial.println("-----------------------------------");
    Serial.print("Range:         ±");
    switch (ACCEL_RANGE) {
        case LIS3DH_RANGE_2_G:
            Serial.println("2g");
            break;
        case LIS3DH_RANGE_4_G:
            Serial.println("4g");
            break;
        case LIS3DH_RANGE_8_G:
            Serial.println("8g");
            break;
        case LIS3DH_RANGE_16_G:
            Serial.println("16g");
            break;
    }
    Serial.print("INT threshold: ");
    Serial.print(INTERRUPT_THRESHOLD_G);
    Serial.print("g  (INT1_THS = 0x");
    Serial.print(INT1_THS_VALUE, HEX);
    Serial.println(")");
    Serial.print("INT duration:  ");
    Serial.print(INTERRUPT_DURATION_COUNTS);
    Serial.print(" ODR cycles (INT1_DUR = 0x");
    Serial.print(INT1_DUR_VALUE, HEX);
    Serial.println(")");
    Serial.print("INT1 GPIO:     ");
    Serial.println(LIS3DH_INT1_PIN);
    Serial.println("-----------------------------------");
    Serial.println("X_g,Y_g,Z_g");
}
 
void loop() {
    if (g_interrupt_flag) {
        g_interrupt_flag = false;
        uint8_t src = lis.readAndClearInterrupt();
        if (src & 0x40) {  // IA bit — confirmed active interrupt
            Serial.print("[INTERRUPT] High-G event detected! INT1_SRC=0x");
            Serial.print(src, HEX);
            Serial.print("  axes:");
            if (src & 0x02)
                Serial.print(" XH");
            if (src & 0x08)
                Serial.print(" YH");
            if (src & 0x20)
                Serial.print(" ZH");
            Serial.println();
        }
    }
 
    lis.read();
    sensors_event_t event;
    lis.getEvent(&event);
 
    Serial.print(event.acceleration.x / 9.80665f, 3);
    Serial.print(",");
    Serial.print(event.acceleration.y / 9.80665f, 3);
    Serial.print(",");
    Serial.println(event.acceleration.z / 9.80665f, 3);
 
    delay(10);
}