Difference between revisions of "Android Thing: Android Hardware Programming"
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− | == | + | ==Code Samples== |
− | * | + | * Here is a github address for code samples: https://github.com/friendlyarm/AndroidHardwareAccess |
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==Andorid示例源代码编译与部署(以SerialPortDemo进行说明) == | ==Andorid示例源代码编译与部署(以SerialPortDemo进行说明) == | ||
===1) eclipse导入源代码,以SerialPortDemo为例=== | ===1) eclipse导入源代码,以SerialPortDemo为例=== |
Revision as of 08:01, 18 December 2017
Contents
1 Introduction
FriendlyElec developed a library called “libfriendlyarm-hardware.so”, for android developer to access the hardware resources on the development board in their android apps, the library is based on Android NDK.
2 Accessible Interfaces & Ports
- Serial Port
- PWM
- EEPROM
- ADC
- LED
- LCD 1602 (I2C)
- OLED (SPI)
I2C, SPI, GPIO are accessible.
3 Available OS & Boards
- Android 2.3: Mini6410, Tiny6410
- Android 4.2: Mini210S, Smart210 with SDK, Tiny210 with SDK, Tiny4412 with SDK
- Android 4.4: NanoPi M2, NanoPi S2, NanoPC-T2, Smart4418 with SDK
- Android 5: NanoPi M3, NanoPi-T3, Tiny4412 with SDK
4 Code Samples
- Here is a github address for code samples: https://github.com/friendlyarm/AndroidHardwareAccess
5 Andorid示例源代码编译与部署(以SerialPortDemo进行说明)
5.1 1) eclipse导入源代码,以SerialPortDemo为例
然后打开eclipse,在eclipse菜单File上选择Import导入项目,选择Existing Android Code Into Workspace,
我们把项目名称改为 SerialPortDemo:
5.2 2) 编辑源代码,根据需要更改串口设备文件名称
DEMO要访问的串口设备写死在以下源代码文件的:src/com/friendlyarm/SerialPortDemo/SerialPortDataProcessView.java
你需要根据实际情况更改:
5.2.1 各个平台开发板的串口设备名称
- Allwinner H3/H5平台开发板 (NanoPi M1/NanoPi M1 Plus等)
UART1-> /dev/ttyS1
UART2 -> /dev/ttyS2
UART3 -> /dev/ttyS3 (仅NanoPi M1, NanoPi K1, NanoPi K1 Plus可用)
- S5P4418平台开发板 (NanoPi Fire2A/NanoPi M2A/NanoPi S2/NanoPC-T2等)
UART1 -> /dev/ttyAMA1 [注1]
UART2 -> /dev/ttyAMA2 [注1]
UART3 -> /dev/ttyAMA3
UART4 -> /dev/ttyAMA4
- S5P6818平台开发板 (NanoPi M3/NanoPC-T3等)
UART1 -> /dev/ttySAC1 [注1]
UART2 -> /dev/ttySAC2 [注1]
UART3 -> /dev/ttySAC3
UART4 -> /dev/ttySAC4
注1: 仅部分板子可用,具体请查看原理图.
5.3 3) 编译DEMO源代码,并导出apk文件
在Package Explorer上点击项目名称,保证其处于选中状态:
在eclipse菜单File上选择Export...:
选择Export Android Application:
选择项目SerialPortDemo:
这一步,Eclipse要求我们创建或选择自已的签名,这里我们选择Create new keystore, 填写key生成后保存的路径和密码,然后点next:
继续参考下图完善签名信息,然后点next:
接着选择APK文件的保存位置,这里我们选择保存到 signapk-files子目录下,以方便我们稍后要进行的签名操作:
点Finish完成APK的导出:
5.4 4) 使用系统证书对APK进行重新签名
因为访问硬件需要APK有system权限,所以需要使用系统证对APK进行重新签名,
在命令行下进入signapk-files子目录,然后执行以下命令签名即可:
cd signapk-files/ java -jar ./signapk.jar platform.x509.pem platform.pk8 ./SerialPortDemo.apk SerialPortDemo-Signed.apk
其中,signapk.jar以及签名文件platform.x509.pem和platform.pk8可在开发板资源下载目录的android-platform-key-files目录下找到。
5.5 5) 运行与调试
5.1) 安装APK,用microUSB线将电脑与开发板连接,用adb命令安装SerialPortDemo-Signed.apk:
adb install SerialPortDemo-Signed.apk
5.2) 调试: 运行 SerialPortDemo后,在adb shell命令行模式下执行:
ps -Z
然后找到com.friendlyarm.SerialPortDemo这个进程,如果前面的权限是如下所示,表明程序已经获得了 system 权限:
u:r:system_app:s0 system 1610 112 com.friendlyarm.SerialPortDemo
以上是Android4的,如果是Android5,则略有不同,不过都表示已经是 system 权限:
u:r:platform_app:s0 u0_a60 1905 138 com.friendlyarm.SerialPortDemo
如果程序没有获得 system 权限,则打开串口设备会失败。
6 Resources
- Code Samples: https://github.com/friendlyarm/AndroidHardwareAccess
- Guide to API in Chinese: https://github.com/friendlyarm/AndroidHardwareAccess/blob/master/友善电子Android硬件开发指南.pdf
7 Update Log
7.1 March-2-2017
- Released English version