LPLD V3.10库MPU6050例程输出都是-1，求解

信田

各位大神，有没有用LPLD V3.10的库，里面新出的MPU6050例程是有什么问题么？
我用串口输出采的数据都是-1，求指导哪里有问题

#include "common.h"
#include "DEV_MPU6050.h"

int16 accel_x,accel_y,accel_z,gyro_x,gyro_y,gyro_z;
float32 temperature;

void main()
{
  MPU6050_Init();

  while(1)
  {
    accel_x = MPU6050_GetResult(ACCEL_XOUT_H);
    accel_y = MPU6050_GetResult(ACCEL_YOUT_H);
    accel_z = MPU6050_GetResult(ACCEL_ZOUT_H);
    gyro_x  = MPU6050_GetResult(GYRO_XOUT_H);
    gyro_y  = MPU6050_GetResult(GYRO_YOUT_H);
    gyro_z  = MPU6050_GetResult(GYRO_ZOUT_H);
    temperature = MPU6050_GetResult(TEMP_OUT_H)/340+36.53;

    LPLD_SYSTICK_DelayMs(10);

    printf("ax = %d",accel_x);  printf("  ");
    printf("ay = %d",accel_y);  printf("  ");
    printf("az = %d",accel_z);  printf("  ");
    printf("gx = %d",gyro_x);   printf("  ");
    printf("gy = %d",gyro_y);   printf("  ");
    printf("gz = %d",gyro_z);   printf("  ");
    printf("T  = %d", temperature); printf("\r\n"); printf("\r\n");

    LPLD_SYSTICK_DelayMs(10);
  }
}