1.14. LED点阵滚动显示文字¶
1.14.2. 编程学习¶
打开main.py文件开始编写代码: 导入库文件:
from machine import Pin from micropython import const import time import ustruct import framebuf from pyb import Pin
之后开始初始化引脚，代码为：
r=[Pin(i, Pin.OUT_PP) for i in ['X2','X1','X3','X4','X5','X6','X8','X7']] for i in range (8): r[i].high() c=[Pin(i, Pin.OUT_PP) for i in ['Y2','Y1','Y3','Y4','Y5','Y6','Y8','Y7']] for i in range (8): c[i].high()
注解
通过两个循环把行，列的所有引脚拉高，熄灭LED点阵，只有行列的引脚同时为低电平时灯才能亮。
设置完毕后，即可编写函数实现各种功能，代码如下：
- 全局变量初始化：
png=[#第一次初始化 "00000000", "", "", "", "", "", "", "" ] Letter=[#第一次初始化 [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]] ]
- 代码实现：
def line(row,colDisp):#负责一行灯的亮与灭，row行号，colDisp为列号数组 r[row-1].low() #打开某行 for j in colDisp: if (j>=0 and j<=7): c[j].low()#开启 pyb.delay(1) c[j].high()#熄灭 r[row-1].high()#关闭行 def reser_Letter():#重置Letter global Letter global l l=0 Letter=[ [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]], [[1,2,3,4,5,6,7,8],[[0,0,0,0,0,0,0,0,],[],[],[],[],[],[],[],]] ] def reset_png():#重置png global png png=[ "00000000", "", "", "", "", "", "", "" ] def char( char, x, y, color=0xffff, background=0x0000):#通过framebuf取出字模 global png global Letter global l w = 16 buffer = bytearray(int(w*w/8)) framebuffer = framebuf.FrameBuffer(buffer, w, w, framebuf.MONO_HLSB) print(char, bytearray(char)) print("buf before", buffer) framebuffer.text(char, 0, 0) print("buf after", buffer) k=1 for i in range(13): if i%2==0: print("buf ", i, buffer[i]) a=(bin( buffer[i]))[2:] b=7-len(a) print(b) c='0' for i in range(b):#补0 c=c+'0' a=c+a #print(a) png[k]=png[k]+a k=k+1 def show_png(a):#改为line函数使用的格式 global Letter global l temp=list(a) b=a[0] a=[] for i in range(8): for j in range(8): if temp[i][j]=="1": Letter[l][1][i].append(j) l=l+1 def init():#右移 global Letter temp=Letter #更改数组内的值并赋给temp for i in range(len(temp)):# 2 loops 选择字母 for j in range(8):#8 loops 选择行 for k in range(len(temp[i][1][j])):#每行的每个点加8 temp[i][1][j][k]=temp[i][1][j][k]+8*i #值更改完毕，开始左移，每显示一个，左移一个单位，即所有的数字减一 #还需加上判断，小于0则灭，等于0为亮，大于7位灭，等于7位亮 def move():#每次左移一列 global Letter temp=Letter for i in range(len(temp)):# 2 loops 选择字母 for j in range(8):#8 loops 选择行 for k in range(len(temp[i][1][j])): temp[i][1][j][k]=temp[i][1][j][k]-1 #一个循环后，某行的所有的点向左移动一位 #8个循环后，一个字母的所有点向左一位 #show_LED(temp) def show_word(temp_show):#显示当前情况 #temp = Letter[] for k in range(25): for i in range(len(temp_show)): for l in range(8): line(temp_show[i][0][l],temp_show[i][1][l]) def show_LED(word): global png lword=list(word) for i in range(len(lword)):#给Letter赋值 char(lword[i],100,100) show_png(png) reset_png() Letter[1]=[#在第二位加入心形 [1,2,3,4,5,6,7, 8], [[], [1,2,4,5], [0,3,6], [0,6], [1,5], [2,4], [3], []] ] init()#右移 for i in range(len(lword)*8+4):#将Letter按顺序右移 move()#左移一列 show_word(Letter)#显示 pyb.delay(20) reser_Letter()#重置Letter
- 使用循环调用函数：
while True: show_LED("I NEUAI")#最多输入8位
