效果展示：
由于摄像头拍摄帧率的缘故，正好可以在视频中看到逐行刷新的效果。
本代码已经在KST-51 v1.3.2开发板验证通过，代码如下：
#include <reg52.h>
sbit ADDR0 = P1^0;
sbit ADDR1 = P1^1;
sbit ADDR2 = P1^2;
sbit ADDR3 = P1^3;
sbit ENLED = P1^4;
//图片帧
unsigned char code images[6][8] = {
{0x00,0x7E,0x7E,0x7E,0x7E,0x7E,0x7E,0x00}, //8x8点阵从外圈数第1圈显示的图片帧
{0xFF,0x81,0xBD,0xBD,0xBD,0xBD,0x81,0xFF}, //8x8点阵从外圈数第2圈显示的图片帧
{0xFF,0xFF,0xC3,0xDB,0xDB,0xC3,0xFF,0xFF}, //8x8点阵从外圈数第3圈显示的图片帧
{0xFF,0xFF,0xFF,0xE7,0xE7,0xFF,0xFF,0xFF}, //8x8点阵从外圈数第4圈显示的图片帧
{0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF}, //8x8点阵全部不显示的图片帧
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00} //8x8点阵全部显示的图片帧
};
bit flagcnt50ms = 0; //50ms的标志位变量
bit flagcnt3s = 0; //3s的标志位变量
unsigned char index = 0; //图片帧索引变量
void main() {
bit dir = 1; //图片帧播放方向变量
unsigned char cyclecnt = 0; //图片帧播放次数变量
EA = 1; //使能总中断
ENLED = 0; //使能U4，选择LED点阵
ADDR3 = 0;
TMOD &= 0xF0; //设置Timer0为模式1
TMOD |= 0x01;
TH0 = 0xFC; //为Timer0赋初值0xFC67，定义1ms
TL0 = 0x67;
ET0 = 1; //使能Timer0中断
TR0 = 1; //启动Timer0
while(1){
if(flagcnt50ms){ //如果50ms标志位置1，即50ms到
flagcnt50ms = 0; //50ms标志位清零
if(dir){ //如果dir = 1
index++; //图片帧播放索引每次加1，图片帧正向播放
if(index >= 4){ //图片帧播放到第4帧
dir = 0; //dir置0
}
}
else{
index--; //如果dir = 0，图片帧索引每次减1，图片反向播放
if(index <= 0){ //图片索引播放到第0帧
dir = 1; //dir置1
cyclecnt++; //循环播放变量加1，也就是说正向播放后又反向播放了1次后加1。
}
}
}
if(cyclecnt >= 5){ //如果图片帧循环播放了5次
index = 5; //图片播放第5帧，即LED点阵全部点亮
if(flagcnt3s){ //当前帧播放3s时长到
flagcnt3s = 0; //3s标志位置0
index = 0; //图片帧播放索引置0
cyclecnt = 0; //图片帧循环播放次数置0
dir = 1; //播放方向从正向开始
}
}
}
}
void interruptTimer0() interrupt 1 {
static unsigned int i = 0;
static unsigned int cnt1ms_1 = 0;
static unsigned int cnt1ms_2 = 0;
TH0 = 0xFC; //重新加载Timer0初值
TL0 = 0x67;
cnt1ms_1++; //中断次数计数值加1
if(cnt1ms_1 >= 50){ //中断进入50次，即计时50ms
cnt1ms_1 = 0; //中断进入次数置零
flagcnt50ms = 1; //50ms标志位置1
}
if(index == 5){ //图片刷新最后1帧时
cnt1ms_2++; //中断进入次数开始每次加1
if(cnt1ms_2 >= 3000){ //中断进入3000次，即计时3s
cnt1ms_2 = 0; //中断进入次数置零
flagcnt3s = 1; //3s标志位置1
}
}
//以下代码完成LED点阵的动态扫描刷新
P0 = 0xFF;
switch(i){
case 0: ADDR2 = 0; ADDR1 = 0; ADDR0 = 0; i++; P0 = images[index][0]; break;
case 1: ADDR2 = 0; ADDR1 = 0; ADDR0 = 1; i++; P0 = images[index][1]; break;
case 2: ADDR2 = 0; ADDR1 = 1; ADDR0 = 0; i++; P0 = images[index][2]; break;
case 3: ADDR2 = 0; ADDR1 = 1; ADDR0 = 1; i++; P0 = images[index][3]; break;
case 4: ADDR2 = 1; ADDR1 = 0; ADDR0 = 0; i++; P0 = images[index][4]; break;
case 5: ADDR2 = 1; ADDR1 = 0; ADDR0 = 1; i++; P0 = images[index][5]; break;
case 6: ADDR2 = 1; ADDR1 = 1; ADDR0 = 0; i++; P0 = images[index][6]; break;
case 7: ADDR2 = 1; ADDR1 = 1; ADDR0 = 1; i = 0; P0 = images[index][7]; break;
}
}
另一种方法：也可将图片帧播放过程放进中断：
#include <reg52.h>
sbit ADDR0 = P1^0;
sbit ADDR1 = P1^1;
sbit ADDR2 = P1^2;
sbit ADDR3 = P1^3;
sbit ENLED = P1^4;
//图片帧
unsigned char code images[6][8] = {
{0x00,0x7E,0x7E,0x7E,0x7E,0x7E,0x7E,0x00}, //8x8点阵从外圈数第1圈显示的图片帧
{0xFF,0x81,0xBD,0xBD,0xBD,0xBD,0x81,0xFF}, //8x8点阵从外圈数第2圈显示的图片帧
{0xFF,0xFF,0xC3,0xDB,0xDB,0xC3,0xFF,0xFF}, //8x8点阵从外圈数第3圈显示的图片帧
{0xFF,0xFF,0xFF,0xE7,0xE7,0xFF,0xFF,0xFF}, //8x8点阵从外圈数第4圈显示的图片帧
{0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF}, //8x8点阵全部不显示的图片帧
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00} //8x8点阵全部显示的图片帧
};
void main() {
EA = 1; //使能总中断
ENLED = 0; //使能U4，选择LED点阵
ADDR3 = 0;
TMOD &= 0xF0; //设置Timer0为模式1
TMOD |= 0x01;
TH0 = 0xFC; //为Timer0赋初值0xFC67，定义1ms
TL0 = 0x67;
ET0 = 1; //使能Timer0中断
TR0 = 1; //启动Timer0
while(1){
}
}
void interruptTimer0() interrupt 1 {
static unsigned int i = 0;
static unsigned char index = 0; //图片帧索引变量
static unsigned int cnt1ms_1 = 0;
static unsigned int cnt1ms_2 = 0;
static bit dir = 1; //图片帧播放方向变量
static unsigned char cyclecnt = 0; //图片帧播放次数变量
static bit flagcnt50ms = 0; //50ms的标志位变量
static bit flagcnt3s = 0; //3s的标志位变量
TH0 = 0xFC; //重新加载Timer0初值
TL0 = 0x67;
cnt1ms_1++; //中断次数计数值加1
if(cnt1ms_1 >= 50){ //中断进入50次，即计时50ms
cnt1ms_1 = 0; //中断进入次数置零
flagcnt50ms = 1; //50ms标志位置1
}
if(index == 5){ //图片刷新最后1帧时
cnt1ms_2++; //中断进入次数开始每次加1
if(cnt1ms_2 >= 3000){ //中断进入3000次，即计时3s
cnt1ms_2 = 0; //中断进入次数置零
flagcnt3s = 1; //3s标志位置1
}
}
if(flagcnt50ms){ //如果50ms标志位置1，即50ms到
flagcnt50ms = 0; //50ms标志位清零
if(dir){ //如果dir = 1
index++; //图片帧播放索引每次加1，图片帧正向播放
if(index >= 4){ //图片帧播放到第4帧
dir = 0; //dir置0
}
}
else{
index--; //如果dir = 0，图片帧索引每次减1，图片反向播放
if(index <= 0){ //图片索引播放到第0帧
dir = 1; //dir置1
cyclecnt++; //循环播放变量加1，也就是说正向播放后又反向播放了1次后加1。
}
}
}
if(cyclecnt >= 5){ //如果图片帧循环播放了5次
index = 5; //图片播放第5帧，即LED点阵全部点亮
if(flagcnt3s){ //当前帧播放3s时长到
flagcnt3s = 0; //3s标志位置0
index = 0; //图片帧播放索引置0
cyclecnt = 0; //图片帧循环播放次数置0
dir = 1; //播放方向从正向开始
}
}
//以下代码完成LED点阵的动态扫描刷新
P0 = 0xFF;
switch(i){
case 0: ADDR2 = 0; ADDR1 = 0; ADDR0 = 0; i++; P0 = images[index][0]; break;
case 1: ADDR2 = 0; ADDR1 = 0; ADDR0 = 1; i++; P0 = images[index][1]; break;
case 2: ADDR2 = 0; ADDR1 = 1; ADDR0 = 0; i++; P0 = images[index][2]; break;
case 3: ADDR2 = 0; ADDR1 = 1; ADDR0 = 1; i++; P0 = images[index][3]; break;
case 4: ADDR2 = 1; ADDR1 = 0; ADDR0 = 0; i++; P0 = images[index][4]; break;
case 5: ADDR2 = 1; ADDR1 = 0; ADDR0 = 1; i++; P0 = images[index][5]; break;
case 6: ADDR2 = 1; ADDR1 = 1; ADDR0 = 0; i++; P0 = images[index][6]; break;
case 7: ADDR2 = 1; ADDR1 = 1; ADDR0 = 1; i = 0; P0 = images[index][7]; break;
}
}