求助：12864液晶显示MPU6050数据
先上代码#include "Wire.h"// I2Cdev and MPU6050 must be installed as libraries, or else the .cpp/.h files
// for both classes must be in the include path of your project
#include "I2Cdev.h"
#include "MPU6050.h"
#include "ST7920.h"
// class default I2C address is 0x68
// specific I2C addresses may be passed as a parameter here
// AD0 low = 0x68 (default for InvenSense evaluation board)
// AD0 high = 0x69
MPU6050 accelgyro;
ST7920 lcd;
int16_t ax, ay, az;
int16_t gx, gy, gz;
#define LED_PIN 13
bool blinkState = false;
char str;//define variable
float gx1;
void setup() {
// join I2C bus (I2Cdev library doesn't do this automatically)
Wire.begin();
// initialize serial communication
// (38400 chosen because it works as well at 8MHz as it does at 16MHz, but
// it's really up to you depending on your project)
Serial.begin(38400);
// initialize device
Serial.println("Initializing I2C devices...");
accelgyro.initialize();
// verify connection
Serial.println("Testing device connections...");
Serial.println(accelgyro.testConnection() ? "MPU6050 connection successful" : "MPU6050 connection failed");
// configure Arduino LED for
pinMode(LED_PIN, OUTPUT);
//LCD initialize
lcd.LCD_Init();
lcd.LCD_ClearRam();
}
void loop() {
// read raw accel/gyro measurements from device
accelgyro.getMotion6(&ax, &ay, &az, &gx, &gy, &gz);
// these methods (and a few others) are also available
//accelgyro.getAcceleration(&ax, &ay, &az);
//accelgyro.getRotation(&gx, &gy, &gz);
// display tab-separated accel/gyro x/y/z values
Serial.print("a/g:\t");
Serial.print(ax); Serial.print("\t");
Serial.print(ay); Serial.print("\t");
Serial.print(az); Serial.print("\t");
Serial.print(gx); Serial.print("\t");
Serial.print(gy); Serial.print("\t");
Serial.println(gz);
// blink LED to indicate activity
blinkState = !blinkState;
digitalWrite(LED_PIN, blinkState);
gx1=gx/131.0;//x axis gyro data after converting to international unit
sprintf(str,"%2d",gx1);//convert float to string
lcd.LCD_DisplayStrings(0,0,str);//LCD display converted data
delay(1000);
Arduino1.0.1没法写汉语，只好用英语注释了，请见谅。
其中 gx1=gx/131.0;//x axis gyro data after converting to international unit 这一行，读取的gx1数据正常，是x轴角速度
我想把它显示到12864液晶上，但是显示上去后却是正负变化无常的6位整数（陀螺仪静止时正常的gx1数据在0.01左右）
若把“%2d”改为“%2f” 则屏幕上会显示一个问号
请问怎样才能在12864上显示浮点数？
百思不得其解啊 请大家指教
谢谢 应该是有个类似库的东西，？的原因是因为不直持浮点。我用其它的IDE 也是这样的问题，后来加了浮点库。
但arduino的浮点库不会加。
同样请高人指点。 帮忙顶一下这个贴子。
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