===== NK-R39S2A1 =====
==== 主板框架图 ====
{{:pasted:20221214-220552.png}}
==== 接口定义 ====

{{page>:template:R39S2_hw}}

=== 插针pin定义 ===

{{page>:template:R39S2p_hw_pin}}

=== Jump_sel ===
{{page>:template:R39S2_hw_jump}}
==== 硬件特性 ====
{{page>:template:temp_hwspec}}

==== 快速上手 ====
=== 系统烧录 ===
{{page>:template:temp_burn}}
=== Debug串口调试 ===
{{page>:template:temp_debug}}
=== Android ADB ===
{{page>:template:temp_adb}}
=== Linux SSH ===
{{page>:template:temp_ssh}}

==== Android 使用指南  ====
=== 接口功能测试 ===
== UART ==
{{page>:template:temp_android_uart}}
== LAN ==
{{page>:template:temp_android_lan}}
== WIFI ==
{{page>:template:temp_android_wifi}}
== 4G/5G ==
{{page>:template:temp_android_4g5g}}
== Can ==
{{page>:template:temp_android_can}}
== GPIO/DIO ==
{{page>:template:temp_android_gpio}}
== Audio ==
{{page>:template:temp_android_audio}}
== Mic ==
{{page>:template:temp_android_mic}}
== USB ==
{{page>:template:temp_android_usb}}
== SDCARD ==
{{page>:template:temp_android_sdcard}}
== Bluetooth ==
{{page>:template:temp_android_bluetooch}}
== WatchDog ==
{{page>:template:temp_android_watchdog}}
== Key ==
{{page>:template:temp_android_key}}
== LCD ==
{{page>:template:temp_android_lcd}}
== PowerManager ==
{{page>:template:temp_android_pm}}
== RTC ==
{{page>:template:temp_android_rtc}}
=== 系统基本功能设置 ===
{{page>:template:temp_android_system}}
=== 系统性能测试 ===
{{page>:template:temp_android_perf}}
==== Android API 使用说明 ====
{{page>:template:temp_android_api}}

==== Linux 使用指南  ====
=== 接口功能测试 ===
== GPIO ==
{{page>:template:temp_linux_gpio11}}
== UART ==
{{page>:template:temp_linux_uart}}
== LAN ==
{{page>:template:temp_linux_lan}}
== WIFI ==
{{page>:template:temp_linux_wifi}}
== 4G/5G ==
{{page>:template:temp_linux_4g5g}}
== Can ==
{{page>:template:temp_linux_can}}
== GPIO/DIO ==
1. IO 控制节点都在/sys/class/io_control/	 
 		 	
{{:arm:rk3399:linux:r39s2a1-linux-io.png?600|}}	 
	 
2. IO 对应表如下：	 
^ 功能   ^ 主板丝印  ^ 节点名    ^	 
^ 输入   | IO1       | gpio_ip0  |	 
| :::    | IO2       | gpio_ip1  |	 
| :::    | IO3       | gpio_ip2  |	 
| :::    | IO4       | gpio_ip3  |	
^  输出  | IO5       | gpio_op0  |	 
| :::    | IO6       | gpio_op1  |	 
| :::    | IO7       | gpio_op2  |	 
| :::    | IO8       | gpio_op3  |	 
 
	 	 
3. IO控制方法：

  *输出低电平：

  echo 0 >/sys/class/io_control/gpio_op0
  
  
*输出高电平：

  
  echo 1 >/sys/class/io_control/gpio_op0
  
  
*查看输入电平：

  
  cat /sys/class/io_control/gpio_ip0
{{page>:template:temp_linux_gpio}}
== Audio ==
{{page>:template:temp_linux_audio}}
== Mic ==
{{page>:template:temp_linux_mic}}
== USB ==
{{page>:template:temp_linux_usb}}
== SDCARD ==
{{page>:template:temp_linux_sdcard}}
== Bluetooth ==
{{page>:template:temp_linux_bluetooch}}
== WatchDog ==
{{page>:template:temp_linux_watchdog}}
== Key ==
{{page>:template:temp_linux_key}}
== LCD/Backlight ==
{{page>:template:temp_linux_lcd}}
== PowerManager ==
{{page>:template:temp_linux_pm}}
== RTC/Timezone ==
{{page>:template:temp_linux_rtc}}
== CPU ==
{{page>:template:temp_linux_cpu}}
== Memory ==
{{page>:template:temp_linux_mem}}
== EMMC ==
{{page>:template:temp_linux_emmc}}
==== Linux 编程指南 ====

=== GPIO 应用编程 ===

C参考代码如下：
<code C>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
 
 
static char gpio_path[100];
static int gpio_config(const char *attr, const char *val)
{
    char file_path[100];
    int len;
    int fd;
    sprintf(file_path, "%s/%s", gpio_path, attr);
    if (0 > (fd = open(file_path, O_WRONLY))) {
        perror("open error");
        return fd;
    }
    len = strlen(val);
    if (len != write(fd, val, len)) {
        perror("write error");
        close(fd);
        return -1;
    }
    close(fd); //关闭文件
    return 0;
}
 
int main(int argc, char *argv[])
{
    char file_path[100];
    char val;
    int fd;
    /* 校验传参 */
    if (2 != argc) {
        fprintf(stderr, "usage: %s <gpio>\n", argv[0]);
        exit(-1);
    }
    /* 判断指定编号的 GPIO 是否导出 */
    sprintf(gpio_path, "/sys/class/gpio/gpio%s", argv[1]);
    if (access(gpio_path, F_OK)) {//如果目录不存在 则需要导出
        int len;
        if (0 > (fd = open("/sys/class/gpio/export", O_WRONLY))) {
        perror("open error");
        exit(-1);
        }
    len = strlen(argv[1]);
    if (len != write(fd, argv[1], len)) {//导出 gpio
        perror("write error");
        close(fd);
        exit(-1);
        }
    close(fd); //关闭文件
    }
 
    /* 配置为输入模式 */
    if (gpio_config("direction", "in"))
    exit(-1);
    /* 极性设置 */
    if (gpio_config("active_low", "0"))
    exit(-1);
    /* 配置为非中断方式 */
    if (gpio_config("edge", "none"))
    exit(-1);
    /* 读取 GPIO 电平状态 */
    sprintf(file_path, "%s/%s", gpio_path, "value");
    if (0 > (fd = open(file_path, O_RDONLY))) {
        perror("open error");
        exit(-1);
    }
 
    if (0 > read(fd, &val, 1)) {
        perror("read error");
        close(fd);
        exit(-1);
    }
    printf("value: %c\n", val);
    /* 退出程序 */
    close(fd);
    exit(0);
}
</code>
交叉编译源码：

  aarch64-linux-gnu-gcc -o gpio gpio.c

将编译好的gpio程序使用scp拷贝到 r39s2 主板上，执行测试：

使用方法：

0：./gpio 3

1:./gpio 1
  
{{:arm:rk3399:linux:r39s2_gpio.c.png?600|}}


=== UART 应用编程 ===

系统下操作 UART 的测试串口，以 J_RS232 TX3\RX3 测试为例：

J_RS232 TX3\RX3 设备节点为：

 /dev/ttysWK2

C参考UART高低电平输入代码如下：

<code C>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <errno.h>
int set_opt(int,int,int,char,int);

void main(){
	int fd,nByte;
	char *uart3 = "/dev/ttyS2";
	char bufferR[2];
	char bufferW[2];	

	memset(bufferR, '\0', 2);
	memset(bufferW, '\0', 2);

	if((fd=open(uart3,O_RDWR,0777))<0)
	{
		printf("failed\n");
	}
	else{
		printf("success\n");
		set_opt(fd, 115200, 8, 'N', 1); 

	}


	while(1){	

			nByte = 0;

				memset(bufferR, '\0', 2);
				memset(bufferW, '\0', 2);

	         // printf("hello\n");
			  if((nByte = read(fd, bufferR, 1)) == 1){      //MCU串口发送接收都是单字节(单字符)函数


			    printf("receive:%c\n",bufferR[0]);
				
				bufferW[0] = 'A';

				write(fd,bufferW,1);                    //串口发送单字节（单字符）  buffer[0] = data


				memset(bufferR, '\0', 2);
			    memset(bufferW, '\0', 2);
				
				nByte = 0;
			  }

		}

	close(fd);
	
}

//串口通用初始化函数
int set_opt(int fd,int nSpeed, int nBits, char nEvent, int nStop)
{
	struct termios newtio,oldtio;//定义结构体newtio和oldtio
	//将原串口的数据取到oldtio
	if  ( tcgetattr( fd,&oldtio)  !=  0) { 
		perror("SetupSerial 1");
		return -1;
	}
	//将newio清零和设置c_cflag
	bzero( &newtio, sizeof( newtio ) );
	newtio.c_cflag  |=  CLOCAL | CREAD;//使能接收和忽略控制线
	newtio.c_cflag &= ~CSIZE;
	//设置数据位
	switch( nBits )
	{
		case 7:
			newtio.c_cflag |= CS7;
			break;
		case 8:
			newtio.c_cflag |= CS8;
			break;
	}
	//设置校验位
	switch( nEvent )
	{
		//偶校验
		case 'O':
			newtio.c_cflag |= PARENB;//使能奇偶校验
			newtio.c_cflag |= PARODD;//偶校验
			newtio.c_iflag |= (INPCK | ISTRIP);//输入校验并忽略第八位
			break;
		case 'E': 
			newtio.c_iflag |= (INPCK | ISTRIP);
			newtio.c_cflag |= PARENB;
			newtio.c_cflag &= ~PARODD;//取消偶校验（置零偶校验位），开启奇校验
			break;
		case 'N':  
			newtio.c_cflag &= ~PARENB;//不进行奇偶校验
			break;
	}
	//设置波特率
	switch( nSpeed )
	{
		case 2400:
			cfsetispeed(&newtio, B2400);
			cfsetospeed(&newtio, B2400);
			break;
		case 4800:
			cfsetispeed(&newtio, B4800);
			cfsetospeed(&newtio, B4800);
			break;
		case 9600:
			cfsetispeed(&newtio, B9600);
			cfsetospeed(&newtio, B9600);
			break;
		case 115200:
			cfsetispeed(&newtio, B115200);
			cfsetospeed(&newtio, B115200);
			break;
		case 460800:
			cfsetispeed(&newtio, B460800);
			cfsetospeed(&newtio, B460800);
			break;
		default:
			cfsetispeed(&newtio, B9600);
			cfsetospeed(&newtio, B9600);
			break;
	}
	//设置停止位
	if( nStop == 1 )
		newtio.c_cflag &=  ~CSTOPB;//一位停止位
	else if ( nStop == 2 )
		newtio.c_cflag |=  CSTOPB;//两位停止位

	newtio.c_cc[VTIME]  = 0;//不设置读取超时
	newtio.c_cc[VMIN] = 0;//读取最小字符数为0

	tcflush(fd,TCIFLUSH);//清空缓冲区
	
	//使配置生效
	if((tcsetattr(fd,TCSANOW,&newtio))!=0)
	{
		perror("com set error");
		return -1;
	}
	//	printf("set done!\n\r");
	return 0;
}

</code>

交叉编译源码：

  aarch64-linux-gnu-gcc -o uart uart.c

将编译好的程序使用 scp 拷贝到 3399 主板上，执行测试:

{{:arm:rk3399:linux:r39s2_uart.c.png?600|}}


=== KEY 应用编程 ===

参考系统下操作Key的方法，获取到key的设备节点为
<code>
/dev/input/event2
</code>
C参考代码如下：

<code C>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <linux/input.h>
#include <sys/select.h>
#define INPUT_DEVICE "/dev/input/event2"
int main(int argc, char **argv){
	int fd;
	struct input_event event;
	ssize_t bytesRead;
	int ret;
	fd_set readfds;
	if ( 0 > (fd = open(INPUT_DEVICE,O_RDONLY)))
	{
		perror("open error"); 
		return fd; 
	}
	while(1){
		FD_ZERO(&readfds);
		FD_SET(fd,&readfds);
		ret = select(fd + 1, &readfds, NULL, NULL, NULL);
		if (ret == -1){
			fprintf(stderr,"select call on%s : an error ocurred",argv[1]);
		break;
		}	
		if(FD_ISSET(fd,&readfds)){
			bytesRead = read(fd, &event,sizeof(struct input_event));
			if(bytesRead == -1 )
				fprintf(stderr,"bytesRead :%ld : an error ocurred",bytesRead);
			}	
		if(event.type == EV_KEY && (event.value == 0 || event.value == 1))
		{
			printf("key %s\n",(event.value) ? "pressed" : "released");
		}
	}
	close(fd);
	return EXIT_SUCCESS;
}
</code>

交叉编译源码：

<code> 
aarch64-linux-gnu-gcc -o key key.c
</code>
将编译好的程序使用 scp 拷贝到 r39s2 主板上，执行测试，按动 key 打印如下：

{{:arm:rk3399:linux:key编程.png?600|}}

  *按下按键时显示：key pressed
  *松开按键时显示：key released




==== Linux 应用支持 ====
=== QT交叉编译环境 ===
{{page>:template:temp_Linux_qt}}
=== QT Creator ===
{{page>:template:temp_Linux_qt_creator}}
=== 高清硬解码 ===
{{page>:template:temp_Linux_dec}}
=== Docker ===
{{page>:template:temp_Linux_docker}}

===OpenCL===
  * 系统已经支持OpenCL,输入命令clinfo即可查看支持详情:

{{:arm:rk3399:linux:opencl.png?600|}}

==== Linux OTA 在线升级 ====
{{page>:template:temp_Linux_upgrade}}

终端输入 ota 进行固件在线升级

{{:arm:rk3399:linux:r39x2_ota.c.png?600|}}