玩转RP2040之使用Python在LCD上显示多类型字体
<div class='showpostmsg'> 本帖最后由 DDZZ669 于 2022-12-4 14:32 编辑<p cid="n0" mdtype="paragraph">上篇文章:<a href="https://bbs.eeworld.com.cn/thread-1227388-1-1.html" target="_blank">玩转RP2040之使用Python在LCD上显示图片</a>，介绍了使用一个开源的Python固件后，可以方便的在微雪RP2040上显示图片。此开源项目中，使用这个固件，还可以方便的显示多种不同的字体，并可以定义多种不同的字体大小，本篇就来测试下不同字体的显示情况。</p>
<h2 cid="n2" mdtype="heading">1 随机位置随机颜色显示字体-hello.py</h2>
<p cid="n3" mdtype="paragraph">实测效果如下图，由于字体位置在快速变动，拍照效果有些糊，可看下后面的视频效果。</p>
<p> </p>
<p cid="n4" mdtype="paragraph"></p>
<p cid="n5" mdtype="paragraph">对应的程序如下：</p>
<pre>
<code class="language-python">import random
from machine import Pin, SPI
import gc9a01
import vga1_bold_16x32 as font
DC = 8
CS = 9
SCK = 10
MOSI = 11
RST = 12
BL = 25
def main():
spi = SPI(1, baudrate=60000000, sck=Pin(SCK), mosi=Pin(MOSI))
tft = gc9a01.GC9A01(
spi,
240,
240,
reset=Pin(RST, Pin.OUT),
cs=Pin(CS, Pin.OUT),
dc=Pin(DC, Pin.OUT),
backlight=Pin(BL, Pin.OUT),
rotation=0)
tft.init()
while True:
for rotation in range(4):
tft.rotation(rotation)
tft.fill(0)
col_max = tft.width() - font.WIDTH*6
row_max = tft.height() - font.HEIGHT
for _ in range(128):
tft.text(
font,
"Hello!",
random.randint(0, col_max),
random.randint(0, row_max),
gc9a01.color565(
random.getrandbits(8),
random.getrandbits(8),
random.getrandbits(8)),
gc9a01.color565(
random.getrandbits(8),
random.getrandbits(8),
random.getrandbits(8))
)
main()</code></pre>
<p cid="n7" mdtype="paragraph">分析主函数，在屏幕的随机位置，使用随机的函数，在一个LCD屏幕上，显示128个Hello字体</p>
<p cid="n7" mdtype="paragraph">动态效果：</p>
<p cid="n7" mdtype="paragraph">e97dcba7602205ffd2c196d8bc15942d<br />
</p>
<h2 cid="n10" mdtype="heading">2 指定位置指定颜色显示字符串-hershey.py</h2>
<p> </p>
<p cid="n11" mdtype="paragraph">实测效果如下图</p>
<p> </p>
<p cid="n12" mdtype="paragraph"></p>
<p> </p>
<p cid="n13" mdtype="paragraph">对应的程序如下：</p>
<pre>
<code class="language-python">import utime
from machine import Pin, SPI
import gc9a01
# Load several frozen fonts from flash
import greeks
import italicc
import italiccs
import meteo
import romanc
import romancs
import romand
import romanp
import romans
import scriptc
import scripts
DC = 8
CS = 9
SCK = 10
MOSI = 11
RST = 12
BL = 25
def cycle(p):
'''
return the next item in a list
'''
try:
len(p)
except TypeError:
cache = []
for i in p:
yield i
cache.append(i)
p = cache
while p:
yield from p
COLORS = cycle()
FONTS = cycle([
greeks, italicc, italiccs, meteo, romanc, romancs,
romand, romanp, romans, scriptc, scripts])
GREETINGS = cycle([
"bonjour", "buenas noches", "buenos dias",
"good day", "good morning", "hey",
"hi-ya", "hi", "how are you", "how goes it",
"howdy-do", "howdy", "shalom", "welcome",
"what's happening", "what's up"])
def main():
'''
Draw greetings on display cycling thru hershey fonts and colors
'''
# configure display
spi = SPI(1, baudrate=60000000, sck=Pin(SCK), mosi=Pin(MOSI))
tft = gc9a01.GC9A01(
spi,
240,
240,
reset=Pin(RST, Pin.OUT),
cs=Pin(CS, Pin.OUT),
dc=Pin(DC, Pin.OUT),
backlight=Pin(BL, Pin.OUT),
rotation=0)
tft.init()
tft.fill(gc9a01.BLACK)
width = tft.width()
while True:
for line in range(1, 7):
row = line * 32
color = next(COLORS)
tft.fill_rect(0, row-16, width, 38, gc9a01.BLACK)
tft.draw(next(FONTS), next(GREETINGS), 0, row, color)
utime.sleep(0.25)
main()</code></pre>
<p cid="n15" mdtype="paragraph">分析主程序，在LCD上的7行位置，显示指定颜色的指定字符串</p>
<p cid="n16" mdtype="paragraph">动态效果：</p>
<p>99c8d10cba6a4d492720b12834d7dda2<br />
</p>
<h2 cid="n17" mdtype="heading">3 scroll.py滚动字体</h2>
<p cid="n18" mdtype="paragraph">实测效果如下图，由于字体位置在快速变动，拍照效果有些糊，可看下后面的视频效果。</p>
<p> </p>
<p cid="n19" mdtype="paragraph"></p>
<p> </p>
<p cid="n20" mdtype="paragraph">对应的程序如下：</p>
<pre>
<code class="language-python">import utime
from machine import Pin, SPI
import gc9a01
import vga1_bold_16x16 as font
DC = 8
CS = 9
SCK = 10
MOSI = 11
RST = 12
BL = 25
def cycle(p):
try:
len(p)
except TypeError:
cache = []
for i in p:
yield i
cache.append(i)
p = cache
while p:
yield from p
def main():
spi = SPI(1, baudrate=60000000, sck=Pin(SCK), mosi=Pin(MOSI))
tft = gc9a01.GC9A01(
spi,
240,
240,
reset=Pin(RST, Pin.OUT),
cs=Pin(CS, Pin.OUT),
dc=Pin(DC, Pin.OUT),
backlight=Pin(BL, Pin.OUT),
rotation=0)
colors = cycle()
foreground = next(colors)
background = gc9a01.BLACK
tft.init()
tft.fill(background)
utime.sleep(1)
height = tft.height()
width = tft.width()
last_line = height - font.HEIGHT
tfa = 0 # top free area
tfb = 0 # bottom free area
tft.vscrdef(tfa, height, tfb)
scroll = 0
character = font.FIRST
while True:
# clear top line before scrolling off display
tft.fill_rect(0, scroll, width, 1, background)
# Write new line when we have scrolled the height of a character
if scroll % font.HEIGHT == 0:
line = (scroll + last_line) % height
# write character hex value as a string
tft.text(
font,
'x{:02x}'.format(character),
16,
line,
foreground,
background)
# write character using a integer (could be > 0x7f)
tft.text(
font,
character,
90,
line,
foreground,
background)
# change color for next line
foreground = next(colors)
# next character with rollover at 256
character += 1
if character > font.LAST:
character = font.FIRST
# scroll the screen up 1 row
tft.vscsad(scroll+tfa)
scroll += 1
scroll %= height
utime.sleep(0.01)
main()</code></pre>
<p cid="n22" mdtype="paragraph">分析主程序，在LCD上滚动显示不同颜色的字符</p>
<p> </p>
<p cid="n23" mdtype="paragraph">动态效果：</p>
<p>f6ef7734554cff1d3289876252a5681d<br />
</p>
<h2 cid="n24" mdtype="heading">4 noto_fonts.py</h2>
<p cid="n25" mdtype="paragraph">实测效果如下图</p>
<p cid="n26" mdtype="paragraph"></p>
<p> </p>
<p cid="n27" mdtype="paragraph">对应的程序如下：</p>
<pre>
<code class="language-python">from machine import SPI, Pin
import gc9a01
import NotoSans_32 as noto_sans
import NotoSerif_32 as noto_serif
import NotoSansMono_32 as noto_mono
DC = 8
CS = 9
SCK = 10
MOSI = 11
RST = 12
BL = 25
def main():
def center(font, s, row, color=gc9a01.WHITE):
screen = tft.width() # get screen width
width = tft.write_len(font, s) # get the width of the string
if width and width < screen: # if the string < display
col = tft.width() // 2 - width // 2# find the column to center
else: # otherwise
col = 0 # left justify
tft.write(font, s, col, row, color) # and write the string
try:
spi = SPI(1, baudrate=60000000, sck=Pin(SCK), mosi=Pin(MOSI))
tft = gc9a01.GC9A01(
spi,
240,
240,
reset=Pin(RST, Pin.OUT),
cs=Pin(CS, Pin.OUT),
dc=Pin(DC, Pin.OUT),
backlight=Pin(BL, Pin.OUT),
rotation=0)
tft.init()
# enable display and clear screen
tft.init()
tft.fill(gc9a01.BLACK)
# center the name of the first font, using the font
row = 16
center(noto_sans, "NotoSans", row, gc9a01.RED)
row += noto_sans.HEIGHT
# center the name of the second font, using the font
center(noto_serif, "NotoSerif", row, gc9a01.GREEN)
row += noto_serif.HEIGHT
# center the name of the third font, using the font
center(noto_mono, "NotoSansMono", row, gc9a01.BLUE)
row += noto_mono.HEIGHT
finally:
# shutdown spi
if 'spi' in locals():
spi.deinit()
main()</code></pre>
<h2 cid="n29" mdtype="heading">5 mono_fonts.py</h2>
<p cid="n30" mdtype="paragraph">实测效果如下图</p>
<p> </p>
<p cid="n31" mdtype="paragraph"></p>
<p> </p>
<p cid="n32" mdtype="paragraph">对应的程序如下：</p>
<pre>
<code class="language-python">import time
from machine import Pin, SPI
import gc9a01
from mono_font import inconsolata_16 as font_16
from mono_font import inconsolata_32 as font_32
from mono_font import inconsolata_64 as font_64
DC = 8
CS = 9
SCK = 10
MOSI = 11
RST = 12
BL = 25
def main():
fast = False
def display_font(font):
tft.fill(gc9a01.BLUE)
column = 0
row = 0
for char in font.MAP:
tft.bitmap(font, column, row, font.MAP.index(char))
column += font.WIDTH
if column >= tft.width() - font.WIDTH:
row += font.HEIGHT
column = 0
if row > tft.height() - font.HEIGHT:
row = 0
if not fast:
time.sleep(0.05)
spi = SPI(1, baudrate=60000000, sck=Pin(SCK), mosi=Pin(MOSI))
tft = gc9a01.GC9A01(
spi,
240,
240,
reset=Pin(RST, Pin.OUT),
cs=Pin(CS, Pin.OUT),
dc=Pin(DC, Pin.OUT),
backlight=Pin(BL, Pin.OUT),
rotation=0)
tft.init()
while True:
for font in :
display_font(font)
fast = not fast
main()</code></pre>
<p cid="n34" mdtype="paragraph">分析主程序，在LCD上依次显示3中不同大小的字体</p>
<p cid="n35" mdtype="paragraph">动态效果：</p>
<p cid="n35" mdtype="paragraph">4be0a16fc47605cbd7faac3371f3e454<br />
</p>
<h2 cid="n36" mdtype="heading">6 changp.py</h2>
<p cid="n37" mdtype="paragraph">实测效果如下图</p>
<p cid="n38" mdtype="paragraph"></p>
<p> </p>
<p cid="n39" mdtype="paragraph">对应的程序如下：</p>
<pre>
<code class="language-python">from machine import Pin, SPI
import gc9a01
from prop_font import chango_16 as font_16
from prop_font import chango_32 as font_32
from prop_font import chango_64 as font_64
DC = 8
CS = 9
SCK = 10
MOSI = 11
RST = 12
BL = 25
def main():
spi = SPI(1, baudrate=60000000, sck=Pin(SCK), mosi=Pin(MOSI))
tft = gc9a01.GC9A01(
spi,
240,
240,
reset=Pin(RST, Pin.OUT),
cs=Pin(CS, Pin.OUT),
dc=Pin(DC, Pin.OUT),
backlight=Pin(BL, Pin.OUT),
rotation=0)
# enable display and clear screen
tft.init()
tft.fill(gc9a01.BLACK)
row = 0
tft.write(font_16, "abcdefghijklmnopqrstuvwxyz", 0, row)
row += font_16.HEIGHT
tft.write(font_32, "abcdefghijklm", 0, row)
row += font_32.HEIGHT
tft.write(font_32, "nopqrstuvwxy", 0, row)
row += font_32.HEIGHT
tft.write(font_64, "abcdef", 0, row)
row += font_64.HEIGHT
tft.write(font_64, "ghijkl", 0, row)
row += font_64.HEIGHT
main()</code></pre>
<p cid="n41" mdtype="paragraph">分析主程序，在LCD上显示4中不同大小的字体</p>
<h2 cid="n42" mdtype="heading">总结</h2>
<p cid="n43" mdtype="paragraph">本篇介绍了使用MicroPython在RP2040的LCD屏幕上进行多种字体的显示测试，使用一个开源的Python固件后，可以方便地在LCD上显示多种类型、多种颜色、多种大小的字体。</p>
<p> </p>
<p> </p>
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<p>随机位置随机颜色显示字体-hello.py测试的不错</p>
可以做个手表玩的。
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