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[[Android Hardware Programming for RK3399|English]]
 
  
==简介==
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{{RockchipUnbrick|NanoPC-T4}}
友善电子开发了一个名为libfriendlyarm-hardware.so的函数库,用于Android应用程序访问开发板上的硬件资源,该函数库基于Android-NDK技术开发,提供便利的硬件访问接口,开发者无需掌握过多的嵌入式知识便可使用,有效提高开发进度。<br /><br />
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本篇文章仅适用于RK3399开发板,包括 NanoPi-NEO4, NanoPi-M4 和 NanoPC-T4。<br />
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其他平台也有相应的支持,请移步这里查看:[[Android Hardware Access APIs/zh]]
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==支持如下RK3399官方Android BSP==
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* Android 7.1.2
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* Android 8.1
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==支持如下RK3399硬件资源==
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* Serial Port
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* GPIO
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* ADC
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* PWM
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* I2C
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* RTC
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* Watch dog
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* SPI
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等等, 接口包括I2C, SPI, GPIO常用的接口。<br />
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[[File:NanoPC-T4+OLED.jpg|frameless|450px|Smart4418SDK+OLED]]
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==支持的开发板==
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* NanoPi-NEO4
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* NanoPi-M4
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* NanoPC-T4
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* 其他开发板请移步这里查看:[[Android Hardware Access APIs/zh]]
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==开源Android示例==
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所有硬件访问的示例程序均已集成到 Android 的源代码当中,位于 Android7.1.2 和 Android8.1 源代码的以下目录:vendor/friendlyelec/apps,也可以单独网上下载,下表中列出各个 Demo 的源代码地址:
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{{libfriendlyarm-hardware.so Android8 Demos}}
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{{libfriendlyarm-hardware.so Android7 Demos}}
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{{libfriendlyarm-hardware.so Installation Guide/zh}}
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==RK3399平台Android硬件资源的程序访问==
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===Serial Port===
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目前可用的串口是UART4,设备名称为/dev/ttyS4,其他串口资源如下表所示,你也可以使用USB转串口来扩展:
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::{| class="wikitable"
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|-
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|串口设备 || 串口资源占用情况
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|-
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|UART0  || 已被蓝牙占用
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|-
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|UART1  ||  已被千兆以太网占用 
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|-
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|UART2  ||  已被作为调试串口
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|-
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|UART3  ||  已被千兆以太网占用
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|-
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|UART4  ||  空闲,设备名称为 /dev/ttyS4 (注:需使用20180618之后的ROM)
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|}
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Android硬件库为串口API:
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::{| class="wikitable"
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|-
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| style="background: PaleTurquoise; color: black" | '''接口名称'''
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| style="background: PaleTurquoise; color: black" |'''参数与返回值说明'''
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| style="background: PaleTurquoise; color: black" |'''功能说明'''
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|-
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|
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<syntaxhighlight lang="java">
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int openSerialPortEx(
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String devName,
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long baud,
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int dataBits,
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int stopBits,
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String parityBit,
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String flowCtrl
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)
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</syntaxhighlight>
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||
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参数说明:<br />
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devName: 串口设备文件名,可选的值有:<br />
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/dev/ttyS4<br />
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baud:    波特率 <br />
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dataBits: 数据位 (取值 5~8,一般用8 )<br />
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stopBits: 停止位 (取值 1~2,一般用1 )<br />
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parityBit: 奇偶校验位(取值为单个字母,O表示奇校验,E表示偶校验,N表示无校验)<br />
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flowCtrl: 数据流控制(取值为单个字母,H表示硬件流控制,S表示软件流控制,N表示不使用数据流控制)<br />
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返回值说明:<br />
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成功打开串口时,将返回串口的文件描述符,用该描述符可进行 read、write和select等操作,如果打开失败,则返回 -1<br />
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||
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打开指定的串口设备,并返回文件描述符。
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|-
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|}
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串口的读写使用以下通用接口:
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<syntaxhighlight lang="c">
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HardwareControler.select  //轮询串口是否有数据可写或可读
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HardwareControler.read    //读取串口数据
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HardwareControler.write    //写数据到串口
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HardwareControler.close    //关闭设备
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</syntaxhighlight>
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===GPIO===
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===ADC===
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===PWM===
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===I2C===
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===RTC===
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可以直接使用cat和echo操作/sys/class/rtc/rtc0/下面的接口。
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比如查看当前RTC的日期和时间:
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<syntaxhighlight lang="bash">
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cat /sys/class/rtc/rtc0/date
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# 2018-10-20                                                             
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cat /sys/class/rtc/rtc0/time                                           
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# 08:20:14
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</syntaxhighlight>
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设置开机时间,如设置120秒后开机:
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<syntaxhighlight lang="bash">
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#120秒后定时开机
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echo +120 >  /sys/class/rtc/rtc0/wakealarm
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</syntaxhighlight>
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===Watch dog===
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===SPI===
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==函数库(libfriendlyarm-hardware.so)接口说明==
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请参考这份WiKi文档:[[Android Hardware Access APIs/zh]]
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Latest revision as of 09:23, 4 June 2024

1 Unbricking Method

If the ROM is not installed correctly, causing the development board to become bricked, and you might not have the opportunity to reinstall the ROM via an SD card, you need to enter Maskrom mode to unbrick it by erasing the storage device.

1.1 Windows Users

1.1.1 Download Required Files

  • Get the necessary tools: Visit here, find RKDevTool_v3.19_for_window.zip and DriverAssitant_v5.12.zip in the 05_Tools directory, and download them to your local machine.
  • Install Rockchip USB driver and RKDevTool: Extract DriverAssitant_v5.12.zip to install the Rockchip USB driver, and extract RKDevTool_v3.19_for_window.zip to obtain the Rockchip flashing tool RKDevTool.
  • Get the loader: Visit here, enter the tools directory corresponding to your CPU model, and download MiniLoaderAll.bin.

1.1.2 Enter Maskrom Mode to Erase the Storage Device

  • Connect NanoPC-T4 to your computer using a USB data cable.
  • Start RKDevTool on your computer.
  • Disconnect the power from NanoPC-T4, hold down the MASK button, connect the power, and release the button when you see Found One MASKROM Device displayed at the bottom of the interface, as shown below:

Rkdevtool found one maskrom device.png

  • Click the Advanced Function tab in the RKDevTool interface.
  • In the Boot text box, select MiniLoaderAll.bin, then click the Download button.
  • Select EMMC, click Switch Storage, then click the EraseAll button to erase the eMMC.

Rkdevtool erase emmc.png

  • At this point, NanoPC-T4 is restored to its initial state and can be normally booted via SD card or eMMC.

1.2 Linux/Mac Users

1.2.1 Download the Required Files

  • Get the necessary tools: Visit here and find upgrade_tool_v2.30_for_linux.tgz (or for Mac users, select upgrade_tool_v2.25_for_mac.tgz) in the 05_Tools directory and download it locally.
  • Get the loader: Visit here, enter the tools directory corresponding to your CPU model, and download MiniLoaderAll.bin.

1.2.2 Installation for upgrade_tool

The following commands are for Linux, with only slight differences in file and directory names for Mac users:

tar xzf upgrade_tool_v2.30_for_linux.tgz
cd upgrade_tool_v2.30_for_linux
sudo cp upgrade_tool /usr/local/sbin/
sudo chmod 755 /usr/local/sbin/upgrade_tool

1.2.3 Enter Maskrom Mode to Erase the Storage Device

  • Connect NanoPC-T4 to the computer using a USB data cable.
  • Disconnect the power from NanoPC-T4, hold down the MASK button, connect the power, and release the button after 4 seconds.
  • Check the connection with the following command:
upgrade_tool LD

A result similar to "DevNo=1 Vid=0x2207,Pid=0x350b,LocationID=13 Mode=Maskrom SerialNo=" indicates that the device has been detected.

  • Erase the eMMC with the following command:
upgrade_tool EF MiniLoaderAll.bin
  • At this point, NanoPC-T4 has been restored to its initial state and can boot the system normally via SD card or eMMC.