P8b ATCwatch SC7A20 , no interrupt, no pedometer.

accl.cpp

#define ACCL_ADDR (0x18)
#define ACCL_REG_WHOAMI (0x0F)

#define ACCL_REG_CTRL1 (0x20)
#define ACCL_REG_CTRL3 (0x22)
#define ACCL_REG_CTRL4 (0x23)
#define ACCL_REG_CTRL5 (0x24)
#define ACCL_REG_STATUS (0x27)

#define ACCL_OUT_X_L (0x28)
#define ACCL_OUT_X_H (0x29)
#define ACCL_OUT_Y_L (0x2A)
#define ACCL_OUT_Y_H (0x2B)
#define ACCL_OUT_Z_L (0x2C)
#define ACCL_OUT_Z_H (0x2D)

#define ACCL_REG_INT1SRC (0x31)

#define ACCL_REG_TEMPCFG (0x1F)
#define ACCL_OUT_TEMP_L (0x0C)
#define ACCL_OUT_TEMP_H (0x0D)

#define ACCL_MAX_G (980)

void init_accl() {
    pinMode(BMA421_INT, INPUT);

//    // Check device ID.
//    if (accl_read_reg(ACCL_REG_WHOAMI) == 0x11) {
//    }
    //Enable all axes, normal mode, 50Hz.
    accl_write_reg(ACCL_REG_CTRL1, 0x47);
    //BDU & BLE enabled.
    accl_write_reg(ACCL_REG_CTRL4, 0x80);
    //Enable temperature sensor.
//    accl_write_reg(ACCL_REG_TEMPCFG, 0x40);
    //Latch interrupt for INT1
//    accl_write_reg(ACCL_REG_CTRL5, 0x08);

}

uint32_t get_accl_temperature() {
    uint32_t temp = 0;
    uint8_t dl = accl_read_reg(ACCL_OUT_TEMP_L);
    temp = (uint32_t)((accl_read_reg(ACCL_OUT_TEMP_H) << 8) | dl);
    //TODO: scale
    return temp;
}

void update_accl_data() {
    uint8_t dl;
    // check ACCL_REG_STATUS
    if (accl_read_reg(ACCL_REG_STATUS) & 0x0F == 0x0F) {
        dl = accl_read_reg(ACCL_OUT_X_L);
        accl_data.x = (int16_t)((accl_read_reg(ACCL_OUT_X_H) << 8) | dl);
        dl = accl_read_reg(ACCL_OUT_Y_L);
        accl_data.y = (int16_t)((accl_read_reg(ACCL_OUT_Y_H) << 8) | dl);
        dl = accl_read_reg(ACCL_OUT_Z_L);
        accl_data.z = (int16_t)((accl_read_reg(ACCL_OUT_Z_H) << 8) | dl);

        accl_data.x = accl_data.x >> 4;
        accl_data.y = accl_data.y >> 4;
        accl_data.z = accl_data.z >> 4;
    }
}