嵌入式系统实验10

1、嵌入式系统应用教程嵌入式系统应用教程Date:16 October 20211实验10 7段LED和点阵式LED实验嵌入式系统应用教程嵌入式系统应用教程Date:16 October 2021211.9.1 11.9.1 实验目的实验目的 熟悉熟悉LED的相关知识的相关知识 了解了解SPI接口的相关知识接口的相关知识 编程实现编程实现7段段LED数码管显示功能数码管显示功能 编程实现点阵编程实现点阵LED显示功能显示功能嵌入式系统应用教程嵌入式系统应用教程Date:16 October 2021311.9.2 11.9.2 实验设备实验设备 1台安装台安装Linux虚拟机的虚拟机的PC机（上位

2、机）机（上位机） 1台已烧写台已烧写ARM Lnux的博创经典的博创经典UP-TECH-S2410/270-DVP实验箱（下位机）实验箱（下位机）嵌入式系统应用教程嵌入式系统应用教程Date:16 October 2021411.9.3 11.9.3 实验内容实验内容 学习学习LED相关知识相关知识 掌握掌握7段段LED和点阵和点阵LED的显示原理的显示原理 编程实现两位编程实现两位7段段LED数字显示数字显示 编程实现点阵编程实现点阵LED内容显示内容显示嵌入式系统应用教程嵌入式系统应用教程Date:16 October 2021511.9.4 11.9.4 实验原理实验原理1.LED1.L

3、ED显示控制原理显示控制原理（1 1）7 7段段LEDLED嵌入式系统应用教程嵌入式系统应用教程Date:16 October 20216（2 2）试验箱上）试验箱上7 7段驱动链接段驱动链接输出数据显示字符0 xc000 xf910 xa420 xb030 x9940 x9250 x8260 xf870 x8080 x9097 7段段LEDLED段码表段码表嵌入式系统应用教程嵌入式系统应用教程Date:16 October 20217（3 3）点阵式）点阵式LEDLED嵌入式系统应用教程嵌入式系统应用教程Date:16 October 20218（4 4）试验箱点阵驱动链接）试验箱点阵驱动链

4、接嵌入式系统应用教程嵌入式系统应用教程Date:16 October 20219（5 5）显示效果）显示效果嵌入式系统应用教程嵌入式系统应用教程Date:16 October 202110LED应用程序：/basic/10_led/test_led.cLED设备文件：/dev/led/0rawLED驱动程序：/basic/10_led/s3c2410-led.o11.9.5 11.9.5 实验程序实验程序嵌入式系统应用教程嵌入式系统应用教程Date:16 October 202111#include #include #include #include #include #include /#

5、include #define TUBE_IOCTROL 0 x11#define DOT_IOCTROL 0 x12void jmdelay(int n) int i,j,k; for (i=0;in;i+) for (j=0;j100;j+) for (k=0;k100;k+);应用程序应用程序test_led.ctest_led.c嵌入式系统应用教程嵌入式系统应用教程Date:16 October 202112int main() int fd; int i,j,k; unsigned int LEDWORD; unsigned int MLEDA8; unsigned char LED

6、CODE10=0 xc0,0 xf9,0 xa4,0 xb0,0 x99,0 x92,0 x82,0 xf8,0 x80,0 x90; unsigned char dd_data1610=0 xff,0,0,0,0,0,0,0,0,0,0,0 xff,0,0,0,0,0,0,0,0,0,0,0 xff,0,0,0,0,0,0,0,0,0,0,0 xff,0,0,0,0,0,0,0,0,0,0,0 xff,0,0,0,0,0,0,0,0,0,0,0 xff,0,0,0,0,0,0,0,0,0,0,0 xff,0,0,0,0,0,0,0,0,0,0,0 xff,0,0,0 x1,0 x1,0 x1

7、,0 x1,0 x1,0 x1,0 x1,0 x1,0,0,0 x2,0 x2,0 x2,0 x2,0 x2,0 x2,0 x2,0 x2,0,0,0 x4,0 x4,0 x4,0 x4,0 x4,0 x4,0 x4,0 x4,0,0,0 x8,0 x8,0 x8,0 x8,0 x8,0 x8,0 x8,0 x8,0,0,0 x10,0 x10,0 x10,0 x10,0 x10,0 x10,0 x10,0 x10,0,0,0 x20,0 x20,0 x20,0 x20,0 x20,0 x20,0 x20,0 x20,0,0,0 x40,0 x40,0 x40,0 x40,0 x40,0 x4

8、0,0 x40,0 x40,0,0,0 x80,0 x80,0 x80,0 x80,0 x80,0 x80,0 x80,0 x80,0,0, ;嵌入式系统应用教程嵌入式系统应用教程Date:16 October 202113 fd=open(/dev/led/0raw,O_RDWR); if (fd 0) printf(#Led device open fail#n); return (-1); LEDWORD=0 xff00; printf(will enter TUBE LED ,please waiting . n); LEDWORD=0 xff00; ioctl(fd,0 x12,LE

9、DWORD); sleep(1); for (j=0;j2;j+) for (i=0;i10;i+) LEDWORD=(LEDCODEi8)|LEDCODE9-i; ioctl(fd,0 x12,LEDWORD); jmdelay(1500); printf(will enter DIG LED ,please waiting . n); sleep(1);嵌入式系统应用教程嵌入式系统应用教程Date:16 October 202114 for (i=0;i16;i+) write(fd,dd_datai,10);jmdelay(1000); while(1)unsigned char a10

10、; for (i=0;i10;i+)ai = rand() % 255;write(fd,a,10);jmdelay(500); close(fd); return 0;嵌入式系统应用教程嵌入式系统应用教程Date:16 October 2021151、阅读理解源码、阅读理解源码/root/basic/10_led/ test_led.c2、编译应用程序（在开发主机虚拟机、编译应用程序（在开发主机虚拟机Linux上）上）root linux#cd /basic/10_ledroot linux#makeroot linux#ls /应能看到绿色 test_led的可执行文件 3、运行（在超级终端上）、运行（在超级终端上）mnt/yaffsmount -t nfs o nolock 192.168.0.120:/root /hostmnt/yaffscd /host/basic/10_ledhost/basic/10_ledinsmod s3c2410-led.ohost/basic/10_ledinsmod ./test_led11.9.6 11.9.6 实验步骤实验步骤嵌入式系统应用教程嵌入式系统应用教程Date:16 October 202116 编写应用程序，实现用电位器输入的模拟量直接控制直流电机的转速和旋转方向。 编写应用