From 2e3f1afe90fb3ffd0a94d8056566c3336f9d7ddf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=A1=A9=E5=85=A5=E5=AD=94=E7=AB=A0?=
 <salty_good@icloud.com>
Date: Thu, 28 Feb 2019 15:56:00 +0800
Subject: [PATCH] udpate api en ja

---
 docs/en/api/button.md  |   8 +-
 docs/en/api/lcd.md     | 127 ++++++++--------
 docs/en/api/mpu9250.md | 318 ++++++++++++++++++++++-------------------
 docs/en/api/speaker.md |  26 ++--
 docs/en/api/system.md  |   6 +-
 docs/en/api/tf.md      |   4 +-
 docs/ja/api/mpu9250.md | 318 ++++++++++++++++++++++-------------------
 docs/ja/api/speaker.md |   6 +-
 8 files changed, 429 insertions(+), 384 deletions(-)

diff --git a/docs/en/api/button.md b/docs/en/api/button.md
index fbd797ea..c95d78c5 100644
--- a/docs/en/api/button.md
+++ b/docs/en/api/button.md
@@ -12,7 +12,7 @@ uint8_t read();
 
 This function returns reading the state of the button directly. 1: pressed, 0: released.
 
-**Sample:**
+**Example:**
 
 ```arduino
 #include <M5Stack.h>
@@ -40,7 +40,7 @@ uint8_t isPressed();
 
 This function returns the state of the button the last time Button.read() was called. 1: pressed, 0: released.
 
-**Sample:**
+**Example:**
 
 ```arduino
 #include <M5Stack.h>
@@ -72,7 +72,7 @@ uint8_t wasPressed();
 
 This function returns 1 only once each time the button is pressed. 1: pressed, 0: released.
 
-**Sample:**
+**Example:**
 
 ```arduino
 #include <M5Stack.h>
@@ -108,7 +108,7 @@ This function returns 1 if button has been pressed for more than specified time.
 | --- | --- | -- |
 | ms | pressing time (ms) | uint32_t |
 
-**Sample:**
+**Example:**
 
 ```arduino
 #include <M5Stack.h>
diff --git a/docs/en/api/lcd.md b/docs/en/api/lcd.md
index cb2d7aa3..eaac0729 100644
--- a/docs/en/api/lcd.md
+++ b/docs/en/api/lcd.md
@@ -2,11 +2,13 @@
 
 *The screen pixel is 320x240, with the top left corner of the screen as the origin (0,0)*
 
-### fillScreen()
+## fillScreen()
 
-**Function prototype:**
+**Syntax:**
 
-<mark>fillScreen(uint16_t color);</mark> // for arduino
+```arduino
+fillScreen(uint16_t color);
+```
 
 **Function: Fill the entire screen with the specified color.**
 
@@ -15,6 +17,7 @@
 | color | the color to be filled |
 
 **Example:**
+
 ```arduino
 #include <M5Stack.h>
 
@@ -30,15 +33,15 @@ from m5ui import *
 lcd.fillScreen(lcd.RED)
 ``` -->
 
-* * *
+<!-- ### ```arduinolcd.setColor(color [, background_color])</mark> -->
 
+## setTextColor()
 
-<!-- ### <mark>lcd.setColor(color [, background_color])</mark> -->
-### setTextColor()
+**Syntax:**
 
-**Function prototype:**
-
-<mark>setTextColor(uint16_t color, uint16_t backgroundcolor);</mark> // for arduino
+```arduino
+setTextColor(uint16_t color, uint16_t backgroundcolor);
+```
 
 **Function: Set the foreground color and background color of the displayed text.**
 
@@ -50,6 +53,7 @@ lcd.fillScreen(lcd.RED)
 *If backgroundcolor is not given, current background color is used*
 
 **Example:**
+
 ```arduino
 #include <M5Stack.h>
 
@@ -66,19 +70,20 @@ lcd.setTextColor(lcd.RED)
 lcd.setTextColor(lcd.ORANGE, lcd.DARKCYAN)
 ``` -->
 
-* * *
+## setCursor()
 
-### setCursor()
+**Syntax:**
 
-**Function prototype:**
+```arduino
+setCursor(uint16_t x0, uint16_t y0);
+```
 
-<mark>setCursor(uint16_t x0, uint16_t y0);</mark> // for arduino
-
-<!-- <mark>setCursor(x0, y0)</mark> # for micropython -->
+<!-- ```arduinosetCursor(x0, y0)</mark> # for micropython -->
 
 **Function: Move the cursor to (x0, y0).**
 
 **Example:**
+
 ```arduino
 #include <M5Stack.h>
 
@@ -95,13 +100,13 @@ from m5ui import *
 lcd.drawPixel(22,22,lcd.RED)
 ``` -->
 
-* * *
+## drawPixel()
 
-### drawPixel()
+**Syntax:**
 
-**Function prototype:**
-
-<mark>drawPixel(int16_t x, int16_t y, uint16_t color);</mark> // for arduino
+```arduino
+drawPixel(int16_t x, int16_t y, uint16_t color);
+```
 
 **Function: Draw a point at position (x, y).**
 
@@ -112,6 +117,7 @@ lcd.drawPixel(22,22,lcd.RED)
 *If color is not given, current background color is used*
 
 **Example:**
+
 ```arduino
 #include <M5Stack.h>
 
@@ -127,13 +133,13 @@ from m5ui import *
 lcd.drawPixel(22,22,lcd.RED)
 ``` -->
 
-* * *
+## drawLine()
 
-### drawLine()
+**Syntax:**
 
-**Function prototype:**
-
-<mark>drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color);</mark> // for arduino
+```arduino
+drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color);
+```
 
 **Function: Draw the line from point (x,y) to point (x1,y1).**
 
@@ -144,6 +150,7 @@ lcd.drawPixel(22,22,lcd.RED)
 *If color is not given, current background color is used*
 
 **Example:**
+
 ```arduino
 #include <M5Stack.h>
 
@@ -159,13 +166,13 @@ from m5ui import *
 lcd.drawLine(0,0,12,12,lcd.WHITE)
 ``` -->
 
-* * *
+## drawTriangle()
 
-### drawTriangle()
+**Syntax:**
 
-**Function prototype:**
-
-<mark>drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint16_t color);</mark> // for arduino
+```arduino
+drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint16_t color);
+```
 
 **Function: Draw the triangel between points (x,y), (x1,y1) and (x2,y2).**
 
@@ -176,6 +183,7 @@ lcd.drawLine(0,0,12,12,lcd.WHITE)
 *If color is not given, current background color is used*
 
 **Example:**
+
 ```arduino
 #include <M5Stack.h>
 
@@ -191,13 +199,13 @@ from m5ui import *
 lcd.drawLine(0,0,12,12,lcd.WHITE)
 ``` -->
 
-* * *
+## fillTriangle()
 
-### fillTriangle()
+**Syntax:**
 
-**Function prototype:**
-
-<mark>fillTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint16_t color);</mark> // for arduino
+```arduino
+fillTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint16_t color);
+```
 
 **Function: Fill the triangel between points (x,y), (x1,y1) and (x2,y2).**
 
@@ -208,6 +216,7 @@ lcd.drawLine(0,0,12,12,lcd.WHITE)
 *If color is not given, current background color is used*
 
 **Example:**
+
 ```arduino
 #include <M5Stack.h>
 
@@ -223,13 +232,13 @@ from m5ui import *
 lcd.drawLine(0,0,12,12,lcd.WHITE)
 ``` -->
 
-* * *
+## drawRect()
 
-### drawRect()
+**Syntax:**
 
-**Function prototype:**
-
-<mark>drawRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color);</mark> // for arduino
+```arduino
+drawRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color);
+```
 
 **Function: Draw the rectangle from the upper left point at (x,y) and width and height.**
 
@@ -242,6 +251,7 @@ lcd.drawLine(0,0,12,12,lcd.WHITE)
 *If color is not given, current background color is used*
 
 **Example:**
+
 ```arduino
 #include <M5Stack.h>
 
@@ -257,13 +267,13 @@ from m5ui import *
 lcd.drawLine(0,0,12,12,lcd.WHITE)
 ``` -->
 
-* * *
+## fillRect()
 
-### fillRect()
+**Syntax:**
 
-**Function prototype:**
-
-<mark>fillRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color);</mark> // for arduino
+```arduino
+fillRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color);
+```
 
 **Function: Fill the rectangle from the upper left point at (x,y) and width and height.**
 
@@ -276,6 +286,7 @@ lcd.drawLine(0,0,12,12,lcd.WHITE)
 *If color is not given, current background color is used*
 
 **Example:**
+
 ```arduino
 #include <M5Stack.h>
 
@@ -291,13 +302,13 @@ from m5ui import *
 lcd.drawLine(0,0,12,12,lcd.WHITE)
 ``` -->
 
-* * *
+## drawRoundRect()
 
-### drawRoundRect()
+**Syntax:**
 
-**Function prototype:**
-
-<mark>drawRoundRect(int16_t x0, int16_t y0, int16_t w, int16_t h, int16_t radius, uint16_t color);</mark> // for arduino
+```arduino
+drawRoundRect(int16_t x0, int16_t y0, int16_t w, int16_t h, int16_t radius, uint16_t color);
+```
 
 **Function: Draw the rectangle with rounded corners from the upper left point at (x,y) and width and height. Corner radius is given by radius argument.**
 
@@ -311,6 +322,7 @@ lcd.drawLine(0,0,12,12,lcd.WHITE)
 *If color is not given, current background color is used*
 
 **Example:**
+
 ```arduino
 #include <M5Stack.h>
 
@@ -326,19 +338,20 @@ from m5ui import *
 lcd.drawLine(0,0,12,12,lcd.WHITE)
 ``` -->
 
-* * *
+## print()
 
-### print()
+**Syntax:**
 
-**Function prototype:**
-
-<mark>print();</mark> // for arduino
+```arduino
+print();
+```
 
 **Function: Start printing text at the current position of the screen.**
 
 *The specified content is printed in the foreground color by default.*
 
 **Example:**
+
 ```arduino
 #include <M5Stack.h>
 
@@ -354,9 +367,7 @@ from m5ui import *
 lcd.drawLine(0,0,12,12,lcd.WHITE)
 ``` -->
 
-* * *
-
-### Usage {docsify-ignore}
+## Usage {docsify-ignore}
 
 ```arduino
 #include <M5Stack.h>
diff --git a/docs/en/api/mpu9250.md b/docs/en/api/mpu9250.md
index e3590a54..dd3c740a 100644
--- a/docs/en/api/mpu9250.md
+++ b/docs/en/api/mpu9250.md
@@ -1,259 +1,275 @@
-# 姿态传感器 MPU9250
+# IMU Sensor MPU9250
 
-*姿态传感器 MPU9250 是一款多芯片模块，集成两个芯片，一个芯片是 MPU6500，由 3 轴陀螺仪和 3 轴加速度计组成，另外一个是 AK8963 是 3 轴磁力计。*
+*IMU The MPU9250 is a multi-chip module that integrates two chips. One chip is the MPU6500, which consists of a 3-axis gyroscope and a 3-axis accelerometer. The other is the AK8963 is a 3-axis magnetometer.*
 
 ## initMPU9250()
 
-**函数原型：**
+**Syntax:**
 
-<mark>void initMPU9250();</mark>
+```arduino
+void initMPU9250();
+```
 
-<!-- <mark>fillScreen(color)</mark> # for micropython -->
+**Description:**
 
-**功能：初始化 MPU6500 芯片。**
+This function initialize MPU6500 chip.
+
+**Example:**
 
-**例程：**
 ```arduino
 #include <M5Stack.h>
 #include "utility/MPU9250.h"
 
 MPU9250 IMU; // new a MPU9250 object
 
-void setup(){
-    M5.begin();
-    Serial.begin(115200);
+void setup() {
+  M5.begin();
+  Wire.begin();
+  IMU.initMPU9250(); // this line must be after Wire.begin()
+}
 
-    IMU.initMPU9250();
-    byte c = IMU.readByte(MPU9250_ADDRESS, WHO_AM_I_MPU9250);
-    Serial.print("MPU9250 "); Serial.print("I AM "); Serial.print(c, HEX);
+void loop() {
 }
 ```
 
 ## initAK8963()
 
-**函数原型：**
+**Syntax:**
 
-<mark>void initAK8963(float * destination);</mark>
+```arduino
+void initAK8963(float * destination);
+```
 
-<!-- <mark>fillScreen(color)</mark> # for micropython -->
+**Description:**
 
-**功能：初始化 AK8963 芯片。**
+This function initialize AK8963 chip.
 
-| 参数 | 描述 |
-| --- | --- |
-| destination | 出厂预设于 AK8963 芯片内缺省值的数组指针 |
+| Argument | Description | Type |
+| --- | --- | -- |
+| destination | for AK8963 Calibration Value | float * |
+
+**Example:**
 
-**例程：**
 ```arduino
 #include <M5Stack.h>
 #include "utility/MPU9250.h"
 
 MPU9250 IMU; // new a MPU9250 object
 
-void setup(){
-    M5.begin();
-    Serial.begin(115200);
+void setup() {
+  M5.begin();
+  Wire.begin();
 
-    // "magCalibration[3] = {0};" was defined at file "MPU9250.h"
-    IMU.initAK8963(IMU.magCalibration);
-    Serial.println("AK8963 initialized for active data mode....");
-    if (Serial)
-    {
-      //  Serial.println("Calibration values: ");
-      Serial.print("X-Axis sensitivity adjustment value ");
-      Serial.println(IMU.magCalibration[0], 2);
-      Serial.print("Y-Axis sensitivity adjustment value ");
-      Serial.println(IMU.magCalibration[1], 2);
-      Serial.print("Z-Axis sensitivity adjustment value ");
-      Serial.println(IMU.magCalibration[2], 2);
-    }
+  IMU.initAK8963(IMU.magCalibration);
+  M5.Lcd.println("AK8963 initialized for active data mode....");
+  if (Serial)
+  {
+    M5.Lcd.println("Calibration values: ");
+    M5.Lcd.print("X-Axis sensitivity adjustment value ");
+    M5.Lcd.println(IMU.magCalibration[0], 2);
+    M5.Lcd.print("Y-Axis sensitivity adjustment value ");
+    M5.Lcd.println(IMU.magCalibration[1], 2);
+    M5.Lcd.print("Z-Axis sensitivity adjustment value ");
+    M5.Lcd.println(IMU.magCalibration[2], 2);
+  }
+}
+
+void loop() {
 }
 ```
 
 ## calibrateMPU9250()
 
-**函数原型：**
+**Syntax:**
 
-<mark>void calibrateMPU9250(float * gyroBias, float * accelBias);</mark>
+```arduino
+void calibrateMPU9250(float * gyroBias, float * accelBias);
+```
 
-<!-- <mark>fillScreen(color)</mark> # for micropython -->
+**Description:**
 
-**功能：初始化芯片后，执行该函数以读取静止状态下的陀螺仪和加速度值偏移，并保存到各自的偏移寄存器。**
+This function calcurate offset values of gyro and accelerometer.
 
-| 参数 | 描述 |
-| --- | --- |
-| gyroBias | 保存静止下陀螺仪值的数组的地址 |
-| accelBias | 保存静止下加速度值的数组的地址 |
+| Argument | Description | Type |
+| --- | --- | -- |
+| gyroBias | gyro offset | float * |
+| accelBias | accel offset | float * |
+
+**Example:**
 
-**例程：**
 ```arduino
 #include <M5Stack.h>
 #include "utility/MPU9250.h"
 
 MPU9250 IMU; // new a MPU9250 object
 
-void setup(){
-    M5.begin();
-    Serial.begin(115200);
+void setup() {
+  M5.begin();
+  Wire.begin();
 
-    IMU.initMPU9250();
-    byte c = IMU.readByte(MPU9250_ADDRESS, WHO_AM_I_MPU9250);
-    Serial.print("MPU9250 "); Serial.print("I AM "); Serial.print(c, HEX);
-    // "gyroBias[3] = {0};" was defined at file "MPU9250.h"
-    // "accelBias[3] = {0};" was defined at file "MPU9250.h"
-    IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);
-    M5.Lcd.fillScreen(BLACK);
-    M5.Lcd.setTextSize(1);
-    M5.Lcd.setCursor(0, 0); M5.Lcd.print("MPU9250 bias");
-    M5.Lcd.setCursor(0, 16); M5.Lcd.print(" x   y   z  ");
+  IMU.initMPU9250();
+  IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);
+  M5.Lcd.fillScreen(BLACK);
+  M5.Lcd.setTextSize(1);
+  M5.Lcd.setCursor(0, 0); M5.Lcd.print("MPU9250 bias");
+  M5.Lcd.setCursor(0, 16); M5.Lcd.print(" x   y   z  ");
 
-    M5.Lcd.setCursor(0,  32); M5.Lcd.print((int)(1000*IMU.accelBias[0]));
-    M5.Lcd.setCursor(32, 32); M5.Lcd.print((int)(1000*IMU.accelBias[1]));
-    M5.Lcd.setCursor(64, 32); M5.Lcd.print((int)(1000*IMU.accelBias[2]));
-    M5.Lcd.setCursor(96, 32); M5.Lcd.print("mg");
+  M5.Lcd.setCursor(0,  32); M5.Lcd.print((int)(1000 * IMU.accelBias[0]));
+  M5.Lcd.setCursor(32, 32); M5.Lcd.print((int)(1000 * IMU.accelBias[1]));
+  M5.Lcd.setCursor(64, 32); M5.Lcd.print((int)(1000 * IMU.accelBias[2]));
+  M5.Lcd.setCursor(96, 32); M5.Lcd.print("mg");
 
-    M5.Lcd.setCursor(0,  48); M5.Lcd.print(IMU.gyroBias[0], 1);
-    M5.Lcd.setCursor(32, 48); M5.Lcd.print(IMU.gyroBias[1], 1);
-    M5.Lcd.setCursor(64, 48); M5.Lcd.print(IMU.gyroBias[2], 1);
-    M5.Lcd.setCursor(96, 48); M5.Lcd.print("o/s");
+  M5.Lcd.setCursor(0,  48); M5.Lcd.print(IMU.gyroBias[0], 1);
+  M5.Lcd.setCursor(32, 48); M5.Lcd.print(IMU.gyroBias[1], 1);
+  M5.Lcd.setCursor(64, 48); M5.Lcd.print(IMU.gyroBias[2], 1);
+  M5.Lcd.setCursor(96, 48); M5.Lcd.print("o/s");
 }
 
-void loop(){
-
+void loop() {
 }
 ```
 
 ## readByte()
 
-**函数原型：**
+**Syntax:**
 
-<mark>uint8_t readByte(uint8_t address, uint8_t subAddress);</mark>
+```arduino
+uint8_t readByte(uint8_t address, uint8_t subAddress);
+```
 
-<!-- <mark>fillScreen(color)</mark> # for micropython -->
+**Description:**
 
-**功能：读取指定寄存器内数据。返回值：寄存器值，长度为8 位。**
+This function reads a byte data from specified register of MPU9250.
 
-| 参数 | 描述 |
-| --- | --- |
-| address | 芯片 (MPU9250/AK8963)地址 |
-| subAddress | 芯片内寄存器地址 |
+| Argument | Description | Type |
+| --- | --- | -- |
+| address | (MPU9250/AK8963) I2C address | uint8_t |
+| subAddress | register address | uint8_t |
+
+**Example:**
 
-**例程：**
 ```arduino
 #include <M5Stack.h>
 #include "utility/MPU9250.h"
 
 MPU9250 IMU; // new a MPU9250 object
 
-void setup(){
-    M5.begin();
-    Serial.begin(115200);
+void setup() {
+  M5.begin();
+  Wire.begin();
 
-    byte c = IMU.readByte(MPU9250_ADDRESS, WHO_AM_I_MPU9250);
-    Serial.print("MPU9250 "); Serial.print("I AM "); Serial.print(c, HEX);
+  uint8_t id = IMU.readByte(MPU9250_ADDRESS, WHO_AM_I_MPU9250);
+  M5.Lcd.print("MPU9250 I AM 0x"); M5.Lcd.print(id, HEX);
+}
+
+void loop() {
 }
 ```
 
 ## readGyroData()
 
-**函数原型：**
+**Syntax:**
 
-<mark>void readGyroData(int16_t * destination);</mark>
+```arduino
+void readGyroData(int16_t * destination);
+```
 
-<!-- <mark>fillScreen(color)</mark> # for micropython -->
+**Description:**
 
-**功能：读取三个方向的陀螺仪值。**
+This function reads the value of 3-axis gyro sensor.
 
-| 参数 | 描述 |
-| --- | --- |
-| destination | 保存陀螺仪值的数组的地址 |
+| Argument | Description | Type |
+| --- | --- | -- |
+| destination | read gyro values | int16_t * |
+
+**Example:**
 
-**例程：**
 ```arduino
 #include <M5Stack.h>
 #include "utility/MPU9250.h"
 
 MPU9250 IMU; // new a MPU9250 object
 
-void setup(){
-    M5.begin();
-    Serial.begin(115200);
-
-    IMU.initMPU9250();
-    byte c = IMU.readByte(MPU9250_ADDRESS, WHO_AM_I_MPU9250);
-    Serial.print("MPU9250 "); Serial.print("I AM "); Serial.print(c, HEX);
-    IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);
+void setup() {
+  M5.begin();
+  Wire.begin();
+  IMU.initMPU9250();
+  IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);
 }
 
-void loop(){
-    // If intPin goes high, all data registers have new data
-    // On interrupt, check if data ready interrupt
-    if (IMU.readByte(MPU9250_ADDRESS, INT_STATUS) & 0x01)
-    {
-        // "gyroCount[3] = {0};" was defined at file "MPU9250.h"
-        IMU.readGyroData(IMU.gyroCount);  // Read the x/y/z adc values
-        IMU.getGres(); // get Gyro scales saved to "gRes"
-        IMU.gx = (float)IMU.gyroCount[0]*IMU.gRes;
-        IMU.gy = (float)IMU.gyroCount[1]*IMU.gRes;
-        IMU.gz = (float)IMU.gyroCount[2]*IMU.gRes;
-        Serial.print("X-gyro rate: "); Serial.print(IMU.gx, 3);
-        Serial.print(" degrees/sec ");
-        Serial.print("Y-gyro rate: "); Serial.print(IMU.gy, 3);
-        Serial.print(" degrees/sec ");
-        Serial.print("Z-gyro rate: "); Serial.print(IMU.gz, 3);
-        Serial.println(" degrees/sec");
-    }
+void loop() {
+  // If intPin goes high, all data registers have new data
+  // On interrupt, check if data ready interrupt
+  if (IMU.readByte(MPU9250_ADDRESS, INT_STATUS) & 0x01)
+  {
+    M5.Lcd.clear();
+    M5.Lcd.setCursor(0, 0);
+    IMU.readGyroData(IMU.gyroCount);  // Read the x/y/z adc values
+    IMU.getGres(); // get Gyro scales saved to "gRes"
+    IMU.gx = (float)IMU.gyroCount[0] * IMU.gRes;
+    IMU.gy = (float)IMU.gyroCount[1] * IMU.gRes;
+    IMU.gz = (float)IMU.gyroCount[2] * IMU.gRes;
+    M5.Lcd.print("X-gyro rate: "); M5.Lcd.print(IMU.gx, 3);
+    M5.Lcd.println(" degrees/sec ");
+    M5.Lcd.print("Y-gyro rate: "); M5.Lcd.print(IMU.gy, 3);
+    M5.Lcd.println(" degrees/sec ");
+    M5.Lcd.print("Z-gyro rate: "); M5.Lcd.print(IMU.gz, 3);
+    M5.Lcd.println(" degrees/sec");
+  }
+  delay(500);
 }
 ```
 
 ## readAccelData()
 
-**函数原型：**
+**Syntax:**
 
-<mark>void readAccelData(int16_t * destination);</mark>
+```arduino
+void readAccelData(int16_t * destination);
+```
 
-<!-- <mark>fillScreen(color)</mark> # for micropython -->
+**Description:**
 
-**功能：读取三个方向的加速度值。**
+This function reads the value of 3-axis accelerate sensor.
 
-| 参数 | 描述 |
-| --- | --- |
-| destination | 保存加速度值的数组的地址 |
+| Argument | Description | Type |
+| --- | --- | -- |
+| destination | read accelerate values | int16_t * |
+
+**Example:**
 
-**例程：**
 ```arduino
 #include <M5Stack.h>
 #include "utility/MPU9250.h"
 
 MPU9250 IMU; // new a MPU9250 object
 
-void setup(){
-    M5.begin();
-    Serial.begin(115200);
-
-    IMU.initMPU9250();
-    byte c = IMU.readByte(MPU9250_ADDRESS, WHO_AM_I_MPU9250);
-    Serial.print("MPU9250 "); Serial.print("I AM "); Serial.print(c, HEX);
-    IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);
+void setup() {
+  M5.begin();
+  Wire.begin();
+  IMU.initMPU9250();
+  IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);
 }
 
-void loop(){
-    // If intPin goes high, all data registers have new data
-    // On interrupt, check if data ready interrupt
-    if (IMU.readByte(MPU9250_ADDRESS, INT_STATUS) & 0x01)
-    {
-        // "accelCount[3] = {0};" was defined at file "MPU9250.h"
-        IMU.readAccelData(IMU.accelCount);
-        IMU.getAres(); // get accelerometer scales saved to "aRes"
-        IMU.ax = (float)IMU.accelCount[0]*IMU.aRes; // - accelBias[0];
-        IMU.ay = (float)IMU.accelCount[1]*IMU.aRes; // - accelBias[1];
-        IMU.az = (float)IMU.accelCount[2]*IMU.aRes; // - accelBias[2];
-        Serial.print("X-acceleration: "); Serial.print(1000*IMU.ax);
-        Serial.print(" mg ");
-        Serial.print("Y-acceleration: "); Serial.print(1000*IMU.ay);
-        Serial.print(" mg ");
-        Serial.print("Z-acceleration: "); Serial.print(1000*IMU.az);
-        Serial.println(" mg ");
-    }
+void loop() {
+  // If intPin goes high, all data registers have new data
+  // On interrupt, check if data ready interrupt
+  if (IMU.readByte(MPU9250_ADDRESS, INT_STATUS) & 0x01)
+  {
+    M5.Lcd.clear();
+    M5.Lcd.setCursor(0, 0);
+    IMU.readAccelData(IMU.accelCount);
+    IMU.getAres(); // get accelerometer scales saved to "aRes"
+    IMU.ax = (float)IMU.accelCount[0] * IMU.aRes; // - accelBias[0];
+    IMU.ay = (float)IMU.accelCount[1] * IMU.aRes; // - accelBias[1];
+    IMU.az = (float)IMU.accelCount[2] * IMU.aRes; // - accelBias[2];
+    M5.Lcd.print("X-acceleration: "); M5.Lcd.print(1000 * IMU.ax);
+    M5.Lcd.println(" mg ");
+    M5.Lcd.print("Y-acceleration: "); M5.Lcd.print(1000 * IMU.ay);
+    M5.Lcd.println(" mg ");
+    M5.Lcd.print("Z-acceleration: "); M5.Lcd.print(1000 * IMU.az);
+    M5.Lcd.println(" mg ");
+  }
+  delay(500);
 }
 ```
\ No newline at end of file
diff --git a/docs/en/api/speaker.md b/docs/en/api/speaker.md
index 4d79b799..a94bcb0a 100644
--- a/docs/en/api/speaker.md
+++ b/docs/en/api/speaker.md
@@ -2,25 +2,25 @@
 
 ### tone
 
-**Function prototype:**
+**Syntax:**
 
-<mark>tone(uint16_t freq);</mark> // for arduino
+```arduino
+tone(uint16_t freq, [uint32_t duration]);
+```
 
-<mark>tone(uint16_t freq, uint32_t duration);</mark> // for arduino
-<!-- <mark>fillScreen(color)</mark> # for micropython -->
+**Description: Set the pitch of speaker.**
 
-**Function: Set the pitch of speaker.**
-
-| Param | Description |
-| --- | --- |
-| freq  | frequency |
-| duration | duration (unit: millisecond) |
+| Param | Description | type |
+| --- | --- | -- |
+| freq  | frequency | uint16_t |
+| duration | duration (unit: millisecond) | uint16_t |
 
 **Example**
 ```arduino
 #include <M5Stack.h>
 
-M5.begin();
-
-M5.Speaker.tone(900, 1000);
+void setup() {
+  M5.begin();
+  M5.Speaker.tone(900, 1000);
+}
 ```
\ No newline at end of file
diff --git a/docs/en/api/system.md b/docs/en/api/system.md
index d7881e83..f254a47a 100644
--- a/docs/en/api/system.md
+++ b/docs/en/api/system.md
@@ -34,7 +34,7 @@ void M5Stack::begin(bool LCDEnable, bool SDEnable, bool SerialEnable) {
 }
 ```
 
-**Sample:**
+**Example:**
 
 ```arduino
 #include <M5Stack.h>
@@ -71,7 +71,7 @@ void M5Stack::update() {
 }
 ```
 
-**Sample:**
+**Example:**
 
 ```arduino
 #include <M5Stack.h>
@@ -121,7 +121,7 @@ void M5Stack::powerOFF() {
 }
 ```
 
-**Sample:**
+**Example:**
 
 ```arduino
 #include <M5Stack.h>
diff --git a/docs/en/api/tf.md b/docs/en/api/tf.md
index 0f9acb1d..5512bd5a 100644
--- a/docs/en/api/tf.md
+++ b/docs/en/api/tf.md
@@ -16,7 +16,7 @@ This function initialize TF card.
 | --- | --- | -- |
 | cspin | chip select line (defaults SS line of SPI bus) | uint8_t |
 
-**Sample:**
+**Example:**
 
 ```arduino
 #include <M5Stack.h>
@@ -43,7 +43,7 @@ This function open the file.
 | filepath | path to file | const char * |
 | mode | read / write / rw (optional) | uint8_t |
 
-**Sample:**
+**Example:**
 
 ```arduino
 /*
diff --git a/docs/ja/api/mpu9250.md b/docs/ja/api/mpu9250.md
index e3590a54..a36526a2 100644
--- a/docs/ja/api/mpu9250.md
+++ b/docs/ja/api/mpu9250.md
@@ -1,259 +1,275 @@
-# 姿态传感器 MPU9250
+# IMU Sensor MPU9250
 
-*姿态传感器 MPU9250 是一款多芯片模块，集成两个芯片，一个芯片是 MPU6500，由 3 轴陀螺仪和 3 轴加速度计组成，另外一个是 AK8963 是 3 轴磁力计。*
+*IMUとして搭載されているMPU9250は２種類のチップを１つのモジュールに統合しています。ひとつはMPU6500という３軸のジャイロセンサーと3軸の加速度センサーのチップです。もうひとつはAK8963という3軸地磁気センサーのチップです。*
 
 ## initMPU9250()
 
-**函数原型：**
+**構文:**
 
-<mark>void initMPU9250();</mark>
+```arduino
+void initMPU9250();
+```
 
-<!-- <mark>fillScreen(color)</mark> # for micropython -->
+**説明:**
 
-**功能：初始化 MPU6500 芯片。**
+MPU6500チップを初期化します。
+
+**使用例:**
 
-**例程：**
 ```arduino
 #include <M5Stack.h>
 #include "utility/MPU9250.h"
 
 MPU9250 IMU; // new a MPU9250 object
 
-void setup(){
-    M5.begin();
-    Serial.begin(115200);
+void setup() {
+  M5.begin();
+  Wire.begin();
+  IMU.initMPU9250(); // this line must be after Wire.begin()
+}
 
-    IMU.initMPU9250();
-    byte c = IMU.readByte(MPU9250_ADDRESS, WHO_AM_I_MPU9250);
-    Serial.print("MPU9250 "); Serial.print("I AM "); Serial.print(c, HEX);
+void loop() {
 }
 ```
 
 ## initAK8963()
 
-**函数原型：**
+**構文:**
 
-<mark>void initAK8963(float * destination);</mark>
+```arduino
+void initAK8963(float * destination);
+```
 
-<!-- <mark>fillScreen(color)</mark> # for micropython -->
+**説明:**
 
-**功能：初始化 AK8963 芯片。**
+AK8963チップを初期化します。
 
-| 参数 | 描述 |
-| --- | --- |
-| destination | 出厂预设于 AK8963 芯片内缺省值的数组指针 |
+| 引数 | 説明 | 型 |
+| --- | --- | -- |
+| destination | AK8963補正用の値を保存する変数 | float * |
+
+**使用例:**
 
-**例程：**
 ```arduino
 #include <M5Stack.h>
 #include "utility/MPU9250.h"
 
 MPU9250 IMU; // new a MPU9250 object
 
-void setup(){
-    M5.begin();
-    Serial.begin(115200);
+void setup() {
+  M5.begin();
+  Wire.begin();
 
-    // "magCalibration[3] = {0};" was defined at file "MPU9250.h"
-    IMU.initAK8963(IMU.magCalibration);
-    Serial.println("AK8963 initialized for active data mode....");
-    if (Serial)
-    {
-      //  Serial.println("Calibration values: ");
-      Serial.print("X-Axis sensitivity adjustment value ");
-      Serial.println(IMU.magCalibration[0], 2);
-      Serial.print("Y-Axis sensitivity adjustment value ");
-      Serial.println(IMU.magCalibration[1], 2);
-      Serial.print("Z-Axis sensitivity adjustment value ");
-      Serial.println(IMU.magCalibration[2], 2);
-    }
+  IMU.initAK8963(IMU.magCalibration);
+  M5.Lcd.println("AK8963 initialized for active data mode....");
+  if (Serial)
+  {
+    M5.Lcd.println("Calibration values: ");
+    M5.Lcd.print("X-Axis sensitivity adjustment value ");
+    M5.Lcd.println(IMU.magCalibration[0], 2);
+    M5.Lcd.print("Y-Axis sensitivity adjustment value ");
+    M5.Lcd.println(IMU.magCalibration[1], 2);
+    M5.Lcd.print("Z-Axis sensitivity adjustment value ");
+    M5.Lcd.println(IMU.magCalibration[2], 2);
+  }
+}
+
+void loop() {
 }
 ```
 
 ## calibrateMPU9250()
 
-**函数原型：**
+**構文:**
 
-<mark>void calibrateMPU9250(float * gyroBias, float * accelBias);</mark>
+```arduino
+void calibrateMPU9250(float * gyroBias, float * accelBias);
+```
 
-<!-- <mark>fillScreen(color)</mark> # for micropython -->
+**説明:**
 
-**功能：初始化芯片后，执行该函数以读取静止状态下的陀螺仪和加速度值偏移，并保存到各自的偏移寄存器。**
+ジャイロと加速度センサーの補正値を計算します。
 
-| 参数 | 描述 |
-| --- | --- |
-| gyroBias | 保存静止下陀螺仪值的数组的地址 |
-| accelBias | 保存静止下加速度值的数组的地址 |
+| 引数 | 説明 | 型 |
+| --- | --- | -- |
+| gyroBias | gyro オフセット | float * |
+| accelBias | accel オフセット | float * |
+
+**使用例:**
 
-**例程：**
 ```arduino
 #include <M5Stack.h>
 #include "utility/MPU9250.h"
 
 MPU9250 IMU; // new a MPU9250 object
 
-void setup(){
-    M5.begin();
-    Serial.begin(115200);
+void setup() {
+  M5.begin();
+  Wire.begin();
 
-    IMU.initMPU9250();
-    byte c = IMU.readByte(MPU9250_ADDRESS, WHO_AM_I_MPU9250);
-    Serial.print("MPU9250 "); Serial.print("I AM "); Serial.print(c, HEX);
-    // "gyroBias[3] = {0};" was defined at file "MPU9250.h"
-    // "accelBias[3] = {0};" was defined at file "MPU9250.h"
-    IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);
-    M5.Lcd.fillScreen(BLACK);
-    M5.Lcd.setTextSize(1);
-    M5.Lcd.setCursor(0, 0); M5.Lcd.print("MPU9250 bias");
-    M5.Lcd.setCursor(0, 16); M5.Lcd.print(" x   y   z  ");
+  IMU.initMPU9250();
+  IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);
+  M5.Lcd.fillScreen(BLACK);
+  M5.Lcd.setTextSize(1);
+  M5.Lcd.setCursor(0, 0); M5.Lcd.print("MPU9250 bias");
+  M5.Lcd.setCursor(0, 16); M5.Lcd.print(" x   y   z  ");
 
-    M5.Lcd.setCursor(0,  32); M5.Lcd.print((int)(1000*IMU.accelBias[0]));
-    M5.Lcd.setCursor(32, 32); M5.Lcd.print((int)(1000*IMU.accelBias[1]));
-    M5.Lcd.setCursor(64, 32); M5.Lcd.print((int)(1000*IMU.accelBias[2]));
-    M5.Lcd.setCursor(96, 32); M5.Lcd.print("mg");
+  M5.Lcd.setCursor(0,  32); M5.Lcd.print((int)(1000 * IMU.accelBias[0]));
+  M5.Lcd.setCursor(32, 32); M5.Lcd.print((int)(1000 * IMU.accelBias[1]));
+  M5.Lcd.setCursor(64, 32); M5.Lcd.print((int)(1000 * IMU.accelBias[2]));
+  M5.Lcd.setCursor(96, 32); M5.Lcd.print("mg");
 
-    M5.Lcd.setCursor(0,  48); M5.Lcd.print(IMU.gyroBias[0], 1);
-    M5.Lcd.setCursor(32, 48); M5.Lcd.print(IMU.gyroBias[1], 1);
-    M5.Lcd.setCursor(64, 48); M5.Lcd.print(IMU.gyroBias[2], 1);
-    M5.Lcd.setCursor(96, 48); M5.Lcd.print("o/s");
+  M5.Lcd.setCursor(0,  48); M5.Lcd.print(IMU.gyroBias[0], 1);
+  M5.Lcd.setCursor(32, 48); M5.Lcd.print(IMU.gyroBias[1], 1);
+  M5.Lcd.setCursor(64, 48); M5.Lcd.print(IMU.gyroBias[2], 1);
+  M5.Lcd.setCursor(96, 48); M5.Lcd.print("o/s");
 }
 
-void loop(){
-
+void loop() {
 }
 ```
 
 ## readByte()
 
-**函数原型：**
+**構文:**
 
-<mark>uint8_t readByte(uint8_t address, uint8_t subAddress);</mark>
+```arduino
+uint8_t readByte(uint8_t address, uint8_t subAddress);
+```
 
-<!-- <mark>fillScreen(color)</mark> # for micropython -->
+**説明:**
 
-**功能：读取指定寄存器内数据。返回值：寄存器值，长度为8 位。**
+MPU9250の指定のレジスタから1バイト分のデータを取得します。
 
-| 参数 | 描述 |
-| --- | --- |
-| address | 芯片 (MPU9250/AK8963)地址 |
-| subAddress | 芯片内寄存器地址 |
+| 引数 | 説明 | 型 |
+| --- | --- | -- |
+| address | (MPU9250/AK8963) I2Cアドレス | uint8_t |
+| subAddress | レジスタアドレス | uint8_t |
+
+**使用例:**
 
-**例程：**
 ```arduino
 #include <M5Stack.h>
 #include "utility/MPU9250.h"
 
 MPU9250 IMU; // new a MPU9250 object
 
-void setup(){
-    M5.begin();
-    Serial.begin(115200);
+void setup() {
+  M5.begin();
+  Wire.begin();
 
-    byte c = IMU.readByte(MPU9250_ADDRESS, WHO_AM_I_MPU9250);
-    Serial.print("MPU9250 "); Serial.print("I AM "); Serial.print(c, HEX);
+  uint8_t id = IMU.readByte(MPU9250_ADDRESS, WHO_AM_I_MPU9250);
+  M5.Lcd.print("MPU9250 I AM 0x"); M5.Lcd.print(id, HEX);
+}
+
+void loop() {
 }
 ```
 
 ## readGyroData()
 
-**函数原型：**
+**構文:**
 
-<mark>void readGyroData(int16_t * destination);</mark>
+```arduino
+void readGyroData(int16_t * destination);
+```
 
-<!-- <mark>fillScreen(color)</mark> # for micropython -->
+**説明:**
 
-**功能：读取三个方向的陀螺仪值。**
+3軸ジャイロセンサーの値を取得します。
 
-| 参数 | 描述 |
-| --- | --- |
-| destination | 保存陀螺仪值的数组的地址 |
+| 引数 | 説明 | 型 |
+| --- | --- | -- |
+| destination | ジャイロセンサーの値 | int16_t * |
+
+**使用例:**
 
-**例程：**
 ```arduino
 #include <M5Stack.h>
 #include "utility/MPU9250.h"
 
 MPU9250 IMU; // new a MPU9250 object
 
-void setup(){
-    M5.begin();
-    Serial.begin(115200);
-
-    IMU.initMPU9250();
-    byte c = IMU.readByte(MPU9250_ADDRESS, WHO_AM_I_MPU9250);
-    Serial.print("MPU9250 "); Serial.print("I AM "); Serial.print(c, HEX);
-    IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);
+void setup() {
+  M5.begin();
+  Wire.begin();
+  IMU.initMPU9250();
+  IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);
 }
 
-void loop(){
-    // If intPin goes high, all data registers have new data
-    // On interrupt, check if data ready interrupt
-    if (IMU.readByte(MPU9250_ADDRESS, INT_STATUS) & 0x01)
-    {
-        // "gyroCount[3] = {0};" was defined at file "MPU9250.h"
-        IMU.readGyroData(IMU.gyroCount);  // Read the x/y/z adc values
-        IMU.getGres(); // get Gyro scales saved to "gRes"
-        IMU.gx = (float)IMU.gyroCount[0]*IMU.gRes;
-        IMU.gy = (float)IMU.gyroCount[1]*IMU.gRes;
-        IMU.gz = (float)IMU.gyroCount[2]*IMU.gRes;
-        Serial.print("X-gyro rate: "); Serial.print(IMU.gx, 3);
-        Serial.print(" degrees/sec ");
-        Serial.print("Y-gyro rate: "); Serial.print(IMU.gy, 3);
-        Serial.print(" degrees/sec ");
-        Serial.print("Z-gyro rate: "); Serial.print(IMU.gz, 3);
-        Serial.println(" degrees/sec");
-    }
+void loop() {
+  // If intPin goes high, all data registers have new data
+  // On interrupt, check if data ready interrupt
+  if (IMU.readByte(MPU9250_ADDRESS, INT_STATUS) & 0x01)
+  {
+    M5.Lcd.clear();
+    M5.Lcd.setCursor(0, 0);
+    IMU.readGyroData(IMU.gyroCount);  // Read the x/y/z adc values
+    IMU.getGres(); // get Gyro scales saved to "gRes"
+    IMU.gx = (float)IMU.gyroCount[0] * IMU.gRes;
+    IMU.gy = (float)IMU.gyroCount[1] * IMU.gRes;
+    IMU.gz = (float)IMU.gyroCount[2] * IMU.gRes;
+    M5.Lcd.print("X-gyro rate: "); M5.Lcd.print(IMU.gx, 3);
+    M5.Lcd.println(" degrees/sec ");
+    M5.Lcd.print("Y-gyro rate: "); M5.Lcd.print(IMU.gy, 3);
+    M5.Lcd.println(" degrees/sec ");
+    M5.Lcd.print("Z-gyro rate: "); M5.Lcd.print(IMU.gz, 3);
+    M5.Lcd.println(" degrees/sec");
+  }
+  delay(500);
 }
 ```
 
 ## readAccelData()
 
-**函数原型：**
+**構文:**
 
-<mark>void readAccelData(int16_t * destination);</mark>
+```arduino
+void readAccelData(int16_t * destination);
+```
 
-<!-- <mark>fillScreen(color)</mark> # for micropython -->
+**説明:**
 
-**功能：读取三个方向的加速度值。**
+３軸加速度センサーから値を取得します。
 
-| 参数 | 描述 |
-| --- | --- |
-| destination | 保存加速度值的数组的地址 |
+| 引数 | 説明 | 型 |
+| --- | --- | -- |
+| destination | 加速度センサーの値 | int16_t * |
+
+**使用例:**
 
-**例程：**
 ```arduino
 #include <M5Stack.h>
 #include "utility/MPU9250.h"
 
 MPU9250 IMU; // new a MPU9250 object
 
-void setup(){
-    M5.begin();
-    Serial.begin(115200);
-
-    IMU.initMPU9250();
-    byte c = IMU.readByte(MPU9250_ADDRESS, WHO_AM_I_MPU9250);
-    Serial.print("MPU9250 "); Serial.print("I AM "); Serial.print(c, HEX);
-    IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);
+void setup() {
+  M5.begin();
+  Wire.begin();
+  IMU.initMPU9250();
+  IMU.calibrateMPU9250(IMU.gyroBias, IMU.accelBias);
 }
 
-void loop(){
-    // If intPin goes high, all data registers have new data
-    // On interrupt, check if data ready interrupt
-    if (IMU.readByte(MPU9250_ADDRESS, INT_STATUS) & 0x01)
-    {
-        // "accelCount[3] = {0};" was defined at file "MPU9250.h"
-        IMU.readAccelData(IMU.accelCount);
-        IMU.getAres(); // get accelerometer scales saved to "aRes"
-        IMU.ax = (float)IMU.accelCount[0]*IMU.aRes; // - accelBias[0];
-        IMU.ay = (float)IMU.accelCount[1]*IMU.aRes; // - accelBias[1];
-        IMU.az = (float)IMU.accelCount[2]*IMU.aRes; // - accelBias[2];
-        Serial.print("X-acceleration: "); Serial.print(1000*IMU.ax);
-        Serial.print(" mg ");
-        Serial.print("Y-acceleration: "); Serial.print(1000*IMU.ay);
-        Serial.print(" mg ");
-        Serial.print("Z-acceleration: "); Serial.print(1000*IMU.az);
-        Serial.println(" mg ");
-    }
+void loop() {
+  // If intPin goes high, all data registers have new data
+  // On interrupt, check if data ready interrupt
+  if (IMU.readByte(MPU9250_ADDRESS, INT_STATUS) & 0x01)
+  {
+    M5.Lcd.clear();
+    M5.Lcd.setCursor(0, 0);
+    IMU.readAccelData(IMU.accelCount);
+    IMU.getAres(); // get accelerometer scales saved to "aRes"
+    IMU.ax = (float)IMU.accelCount[0] * IMU.aRes; // - accelBias[0];
+    IMU.ay = (float)IMU.accelCount[1] * IMU.aRes; // - accelBias[1];
+    IMU.az = (float)IMU.accelCount[2] * IMU.aRes; // - accelBias[2];
+    M5.Lcd.print("X-acceleration: "); M5.Lcd.print(1000 * IMU.ax);
+    M5.Lcd.println(" mg ");
+    M5.Lcd.print("Y-acceleration: "); M5.Lcd.print(1000 * IMU.ay);
+    M5.Lcd.println(" mg ");
+    M5.Lcd.print("Z-acceleration: "); M5.Lcd.print(1000 * IMU.az);
+    M5.Lcd.println(" mg ");
+  }
+  delay(500);
 }
 ```
\ No newline at end of file
diff --git a/docs/ja/api/speaker.md b/docs/ja/api/speaker.md
index cf698fd4..c36d8025 100644
--- a/docs/ja/api/speaker.md
+++ b/docs/ja/api/speaker.md
@@ -22,8 +22,10 @@ tone(uint16_t freq, [uint32_t duration]);
 ```arduino
 #include <M5Stack.h>
 
-M5.begin();
-M5.Speaker.tone(900, 1000);
+void setup() {
+  M5.begin();
+  M5.Speaker.tone(900, 1000);
+}
 ```
 
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