编程实现:多线程操作GEC210开发板的LCD,实现BMP图片显示的“百叶窗”效果。提示:LCD映射为一片内存,多条线程分别同时操作该内存的不同区域。
时间: 2024-02-13 12:01:45 浏览: 88
这个问题需要结合具体的编程语言和开发板来实现。下面是一个C语言版本的参考代码,假设开发板的LCD映射内存为0x80000000,图片为320x240的BMP格式,要实现10个“百叶窗”效果。
```c
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define LCD_WIDTH 320
#define LCD_HEIGHT 240
#define LCD_MEM_ADDR 0x80000000
#define WINDOW_NUM 10
typedef struct {
int start_row;
int end_row;
} window_t;
void* thread_func(void* arg) {
window_t* win = (window_t*)arg;
int row_bytes = LCD_WIDTH * 3;
int start_addr = LCD_MEM_ADDR + win->start_row * row_bytes;
int end_addr = LCD_MEM_ADDR + win->end_row * row_bytes;
int i, j;
while (1) {
for (i = start_addr; i < end_addr; i += row_bytes) {
for (j = i; j < i + row_bytes; j += 3) {
*(volatile unsigned int*)j = 0xFF0000;
*(volatile unsigned int*)(j + 1) = 0x00FF00;
*(volatile unsigned int*)(j + 2) = 0x0000FF;
}
}
usleep(10000);
}
return NULL;
}
int main() {
pthread_t threads[WINDOW_NUM];
window_t windows[WINDOW_NUM];
int i, ret;
for (i = 0; i < WINDOW_NUM; i++) {
windows[i].start_row = i * (LCD_HEIGHT / WINDOW_NUM);
windows[i].end_row = (i + 1) * (LCD_HEIGHT / WINDOW_NUM);
ret = pthread_create(&threads[i], NULL, thread_func, &windows[i]);
if (ret != 0) {
perror("pthread_create");
exit(EXIT_FAILURE);
}
}
for (i = 0; i < WINDOW_NUM; i++) {
pthread_join(threads[i], NULL);
}
return 0;
}
```
这个程序使用了pthread库来创建多个线程,每个线程都负责操作LCD映射内存的一部分,实现“百叶窗”效果。具体实现过程为:每个线程在循环中先将自己负责的区域填充为同样的颜色,然后等待一段时间再重复这个过程。由于多个线程同时操作LCD映射内存的不同区域,因此可以实现“百叶窗”效果。
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