#include <stm32f10x.h> u8 smgduan[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00}; u32 Tick_Tenms=0,Tick_Sec=0; u8 dispbuf[8]; void SysTick_Handler(void){ static u32 index=0; GPIOB->ODR = (GPIOB->ODR&0x0ff)|(smgduan[index]<<8); GPIOB->ODR = (GPIOB->ODR&0x0ffe3)|(index<<2); index++; index&=0x07; Tick_Tenms++; if((Tick_Tenms%100)==0) Tick_Sec++; } void InitGPIO(){ RCC->APB2ENR|= (1<<3) + (1<<2); GPIOB->CRH = 0x33333333; GPIOB->CRL = (GPIOB->CRL&0xfff000ff)|0x33300; RCC->APB2ENR |= 0x01; AFIO->MAPR |= 0x02000000; } void Init_NVIC(void) { u32 * pReg; u8 *pbReg; pReg=(u32*)0xE000E014; pReg[0]=7200000; pReg=(u32*)0xE000E010; pReg[0]=0x07; pbReg=(u8*)0xE000ED23; pbReg[0]=0xff; } int main(){ extern u32 Tick_Tenms,Tick_Sec; u32 i; Init_NVIC(); InitGPIO(); for(i=0;i<8;i++) if(i==0) dispbuf[i]=2; else if(i==1) dispbuf[i]=1; else if(i==2) dispbuf[i]=0; else if(i==3) dispbuf[i]=1; else if(i==4) dispbuf[i]=1; else if(i==5) dispbuf[i]=7; else if(i==6) dispbuf[i]=2; else dispbuf[i]=9; while(1); }
时间: 2024-04-26 20:21:47 浏览: 12
这段代码是一个控制数码管显示的程序,使用了STM32F10x单片机,其中包含了SysTick定时器中断和GPIO口控制数码管显示。在main函数中,给dispbuf数组赋值,然后通过GPIO口控制数码管的显示。在SysTick_Handler中,通过循环控制index变量在0到7之间循环,然后通过GPIO口控制数码管的显示。Tick_Tenms和Tick_Sec变量分别记录了经过的毫秒数和秒数。InitGPIO函数初始化了GPIO口的设置,Init_NVIC函数初始化了NVIC中断控制器的设置。需要注意的是,这段代码中只给了dispbuf数组的前8个元素赋值,后面的元素没有赋值。
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#include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <stdio.h> #include <unistd.h> #include <string.h> #include <sys/mman.h> //德国国旗 int main(void) { int fd_lcd; int lcd_buf[800*480]; //显存。int -- 4B int j,i; fd_lcd = open("/dev/fb0", O_WRONLY); if(fd_lcd == -1) { perror("open lcd"); return -1; } printf("fd_lcd = %d\n", fd_lcd); for(i=0;i<800*160;i++) lcd_buf[i]=0x00000000; for(i=800*160;i<800*320;i++) lcd_buf[i]=0x00FF0000; for(i=800*320;i<800*480;i++) lcd_buf[i]=0x00FFD700; write(fd_lcd,lcd_buf,sizeof(lcd_buf)); close(fd_lcd); return 0; }仿照以上代码绘制瑞士国旗
以下是一个使用C语言在Linux系统下实现瑞士国旗的代码示例:
```c
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/mman.h>
int main(void)
{
int fd_lcd;
int lcd_buf[800*480]; // 显存。int -- 4B
int j, i;
fd_lcd = open("/dev/fb0", O_WRONLY);
if (fd_lcd == -1)
{
perror("open lcd");
return -1;
}
printf("fd_lcd = %d\n", fd_lcd);
// 绘制红色背景
for (i = 0; i < 800*480; i++)
{
lcd_buf[i] = 0x00FF0000;
}
// 绘制白色十字
int center_x = 400;
int center_y = 240;
int width = 100;
int height = 20;
// 绘制横向条纹
for (i = center_x - width/2; i < center_x + width/2; i++)
{
for (j = 0; j < 480; j++)
{
lcd_buf[j*800 + i] = 0x00FFFFFF;
}
}
// 绘制纵向条纹
for (i = center_y - height/2; i < center_y + height/2; i++)
{
for (j = 0; j < 800; j++)
{
lcd_buf[i*800 + j] = 0x00FFFFFF;
}
}
write(fd_lcd, lcd_buf, sizeof(lcd_buf));
close(fd_lcd);
return 0;
}
```
这段代码与之前的德国国旗代码类似,使用了 `/dev/fb0` 设备文件来进行屏幕绘制。首先将整个屏幕填充为红色背景,然后在屏幕中央绘制一个白色的十字。通过调整 `center_x`、`center_y`、`width` 和 `height` 变量的值,可以调整十字的位置和大小。
请注意,在运行该代码之前,确保你有适当的权限来访问 `/dev/fb0` 设备文件。同时,屏幕分辨率和显示模式可能会影响国旗的显示效果。
#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <fcntl.h> #include <sys/ioctl.h> #include <linux/can.h> #include <linux/can/raw.h> #define CAN_INTERFACE "can0" // CAN接口名称 #define CAN_ID 0x123 // CAN ID int main(void) { int s; // socket描述符 struct sockaddr_can addr; struct ifreq ifr; struct can_frame frame; int nbytes; // 创建socket s = socket(PF_CAN, SOCK_RAW, CAN_RAW); if(s < 0) { perror("socket PF_CAN failed"); return 1; } // 设置CAN接口 strcpy(ifr.ifr_name, CAN_INTERFACE); ioctl(s, SIOCGIFINDEX, &ifr); addr.can_family = PF_CAN; addr.can_ifindex = ifr.ifr_ifindex; bind(s, (struct sockaddr *)&addr, sizeof(addr)); // 发送CAN数据 frame.can_id = CAN_ID; frame.can_dlc = 2; frame.data[0] = 0x01; frame.data[1] = 0x02; nbytes = write(s, &frame, sizeof(struct can_frame)); if(nbytes != sizeof(struct can_frame)) { perror("write failed"); close(s); return 1; } // 接收CAN数据 nbytes = read(s, &frame, sizeof(struct can_frame)); if(nbytes < 0) { perror("read failed"); close(s); return 1; } printf("can_id = 0x%X, can_dlc = %d, data = %02X %02X\n", frame.can_id, frame.can_dlc, frame.data[0], frame.data[1]); close(s); return 0; }这个代码gcc编译不过,重新写一下呢?
这段代码的问题在于缺少头文件的引用,需要添加以下头文件:
```c
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
```
另外,建议在使用 ioctl 函数时加上错误处理,修改后的代码如下:
```c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <linux/can.h>
#include <linux/can/raw.h>
#define CAN_INTERFACE "can0" // CAN接口名称
#define CAN_ID 0x123 // CAN ID
int main(void) {
int s; // socket描述符
struct sockaddr_can addr;
struct ifreq ifr;
struct can_frame frame;
int nbytes;
// 创建socket
s = socket(PF_CAN, SOCK_RAW, CAN_RAW);
if(s < 0) {
perror("socket PF_CAN failed");
return 1;
}
// 设置CAN接口
strcpy(ifr.ifr_name, CAN_INTERFACE);
if(ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
perror("ioctl failed");
close(s);
return 1;
}
addr.can_family = PF_CAN;
addr.can_ifindex = ifr.ifr_ifindex;
if(bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
perror("bind failed");
close(s);
return 1;
}
// 发送CAN数据
frame.can_id = CAN_ID;
frame.can_dlc = 2;
frame.data[0] = 0x01;
frame.data[1] = 0x02;
nbytes = write(s, &frame, sizeof(struct can_frame));
if(nbytes != sizeof(struct can_frame)) {
perror("write failed");
close(s);
return 1;
}
// 接收CAN数据
nbytes = read(s, &frame, sizeof(struct can_frame));
if(nbytes < 0) {
perror("read failed");
close(s);
return 1;
}
printf("can_id = 0x%X, can_dlc = %d, data = %02X %02X\n",
frame.can_id, frame.can_dlc, frame.data[0], frame.data[1]);
close(s);
return 0;
}
```