from micropython import const import framebuf import time
SET_BIAS =const(0xA2)
POWER_CTRL=const(0x28)
SET_BOOST =const(0xF8)
SOFT_RST =const(0xE2)
SEG_DIR =const(0xA0)
COM_DIR =const(0xC0)
REGU_RATIO=const(0x20)
EVSET_MODE=const(0x81)
DISP_ONOFF=const(0xAE)
INV_DISP =const(0xA6)#0:normal display 1:inverse
ALL_PIX_ON=const(0xA4)
SRTLIN_SET=const(0x40)#407F
PAGEAD_SET=const(0xB0)#b0b8
COLHAD_SET=const(0x10)#0x100x1F
COLLAD_SET=const(0x00)#0x000x0F
class ST7567(framebuf.FrameBuffer): def init(self,spi,dc,cs,rst,elecvolt=0x1F,regratio=0x03,invX=0x00,invY=0x00,invdisp=0x00): dc.init(dc.OUT,value=0) cs.init(cs.OUT,value=1)#disable device port rst.init(rst.OUT,value=0)#reset device self.dc=dc self.cs=cs self.rst=rst self.spi=spi
self.EV=elecvolt
self.RR=regratio
self.invX=0x00 if(invX==0) else 0x01#0x00:MX=0 normal dir, 0x01:MX=1 reverse dir
self.invY=0x00 if(invY==0) else 0x08#0x00:MY=0 0x08:MY=1
self.invdisp=0x00 if(invdisp==0) else 0x01
self.buffer=bytearray(128*64//8)
super().__init__(self.buffer,128,64,framebuf.MONO_VLSB)
time.sleep_ms(1)
self.rst.value(1)
time.sleep_ms(1)#reset done
self.initscreen()
time.sleep_ms(50)
self.fill(0)
self.show()
self.write_cmd(DISP_ONOFF|0x01)#1:display on normal display mode
def initscreen(self):
self.write_cmd(SOFT_RST)#optional, I think it's useless
self.write_cmd(SET_BOOST)#set booster mode
self.write_cmd(0x00)#boost: 0x00:x4 0x01:x5
self.write_cmd(SET_BIAS|0x01)# 0:1/9 1:1/7
self.write_cmd(EVSET_MODE)#put device into EV setting mode
self.write_cmd(self.EV)#0x00~0x3F set contrast to 0x1f with last command
self.write_cmd(REGU_RATIO|self.RR)#0x00~0x07 3.0~6.5
self.write_cmd(POWER_CTRL|0x07)#7:{booster on,regulator on,follower on}
self.write_cmd(INV_DISP|self.invdisp)#normal display
self.write_cmd(ALL_PIX_ON|0x00)#0x00:normal display 0x01:all pixel on
self.write_cmd(SEG_DIR|self.invX)#0:MX=0 normal dir, 1:MX=1 reverse dir
self.write_cmd(COM_DIR|self.invY)#0x00:MY=0 0x08:MY=1 (may change to reverse y)
def write_cmd(self,cmd):
self.cs.value(0)#enable device port
self.dc.value(0)#cmd mode
self.spi.write(bytearray([cmd]))
#time.sleep_ms(1)
self.cs.value(1)#disable device port
def write_data(self,data):
self.cs.value(0)#enable device port
self.dc.value(1)#display data mode
self.spi.write(data)
#time.sleep_ms(1)
self.cs.value(1)#disable device port
def show(self):
self.write_cmd(DISP_ONOFF|0x00)
self.write_cmd(SRTLIN_SET|0x00)
colcnt=0
pagcnt=0
while (pagcnt<9):
self.write_cmd(PAGEAD_SET|pagcnt)
self.write_cmd(COLHAD_SET|0x00)
self.write_cmd(COLLAD_SET|0x00)
if(pagcnt<8):
self.write_data(self.buffer[(128*pagcnt):(128*pagcnt+128)])
else:
while (colcnt<128):
colcnt+=1
self.write_data(b"\x00")
pagcnt+=1
self.write_cmd(DISP_ONOFF|0x01)
def clear(self):
self.fill(0)
self.show()
**六、字库程序**
ufont.py
version = 3
import time import struct
import framebuf
DEBUG = False
def timeit(f, *args, **kwargs): try: myname = str(f).split(' ')[1] except: myname = "UNKONW"
def new_func(*args, **kwargs):
if DEBUG:
try:
t = time.ticks_us()
result = f(*args, **kwargs)
delta = time.ticks_diff(time.ticks_us(), t)
print('Function {} Time = {:6.3f}ms'.format(myname, delta / 1000))
except AttributeError:
t = time.perf_counter_ns()
result = f(*args, **kwargs)
delta = time.perf_counter_ns() - t
print('Function {} Time = {:6.3f}ms'.format(myname, delta / 1000000))
return result
else:
return f(*args, **kwargs)
return new_func
class BMFont: @staticmethod def _list_to_byte(arr): b = 0 for a in arr: b = (b << 1) + a return bytes([b])
@timeit
def _bit_list_to_byte_data(self, bit_list):
"""将点阵转换为字节数据
Args:
bit_list:
Returns:
"""
byte_data = b''
for _col in bit_list:
for i in range(0, len(_col), 8):
byte_data += self._list_to_byte(_col[i:i + 8])
return byte_data
@timeit
def __init__(self, font_file):
self.font_file = font_file
self.font = open(font_file, "rb", buffering=0xff)
self.bmf_info = self.font.read(16)
if self.bmf_info[0:2] != b"BM":
raise TypeError("字体文件格式不正确: " + font_file)
self.version = self.bmf_info[2]
if self.version != 3:
raise TypeError("字体文件版本不正确: " + str(self.version))
self.map_mode = self.bmf_info[3] # 映射方式
self.start_bitmap = struct.unpack(">I", b'\x00' + self.bmf_info[4:7])[0] # 位图开始字节
self.font_size = self.bmf_info[7] # 字体大小
self.bitmap_size = self.bmf_info[8] # 点阵所占字节
@timeit
def _to_bit_list(self, byte_data, font_size, *, _height=None, _width=None):
"""将字节数据转换为点阵数据
Args:
byte_data: 字节数据
font_size: 字号大小
_height: 字体原高度
_width: 字体原宽度
Returns:
"""
_height = _height or self.font_size
_width = _width or self.bitmap_size // self.font_size * 8
new_bitarray = [[0 for j in range(font_size)] for i in range(font_size)]
for _col in range(len(new_bitarray)):
for _row in range(len(new_bitarray[_col])):
_index = int(_col / (font_size / _height)) * _width + int(_row / (font_size / _width))
new_bitarray[_col][_row] = byte_data[_index // 8] >> (7 - _index % 8) & 1
return new_bitarray
@timeit
def _color_render(self, bit_list, color):
"""将二值点阵图像转换为 RGB565 彩色字节图像
Args:
bit_list:
color:
Returns:
"""
color_array = b""
for _col in range(len(bit_list)):
for _row in range(len(bit_list)):
color_array += struct.pack("<H", color) if bit_list[_col][_row] else b'\x00\x00'
return color_array
@timeit
def _get_index(self, word):
"""获取索引
Args:
word: 字符
Returns:
"""
word_code = ord(word)
start = 0x10
end = self.start_bitmap
while start <= end:
mid = ((start + end) // 4) * 2
self.font.seek(mid, 0)
target_code = struct.unpack(">H", self.font.read(2))[0]
if word_code == target_code:
return (mid - 16) >> 1
elif word_code < target_code:
end = mid - 2
else:
start = mid + 2
return -1
@timeit
def get_bitmap(self, word):
"""获取点阵图
Args:
word: 字符
Returns:
bytes 字符点阵
"""
index = self._get_index(word)
if index == -1:
return b'\xff\xff\xff\xff\xff\xff\xff\xff\xf0\x0f\xcf\xf3\xcf\xf3\xff\xf3\xff\xcf\xff?\xff?\xff\xff\xff' \
b'?\xff?\xff\xff\xff\xff'
self.font.seek(self.start_bitmap + index * self.bitmap_size, 0)
return self.font.read(self.bitmap_size)
@timeit
def text(self, display, string, x, y, color=1, *, font_size=None, reverse=False, clear=False, show=False,
half_char=True, auto_wrap=False, **kwargs):
"""通过显示屏显示文字
使用此函数显示文字，必须先确认显示对象是否继承与 framebuf.FrameBuffer。
如果显示对象没有 clear 方法，需要自行调用 fill 清屏
Args:
display: 显示实例
string: 字符串
x: 字体左上角 x 轴
y: 字体左上角 y 轴
color: 颜色
font_size: 字号
reverse: 是否反转背景
clear: 是否清除之前显示的内容
show: 是否立刻显示
half_char: 是否半字节显示 ASCII 字符
auto_wrap: 自动换行
**kwargs:
Returns:
None
"""
font_size = font_size or self.font_size
initial_x = x
# 清屏
try:
display.clear() if clear else 0
except AttributeError:
print("请自行调用 display.fill(*) 清屏")
for char in range(len(string)):
# 是否自动换行
if auto_wrap:
if auto_wrap and ((x + font_size // 2 >= 128 and ord(string[char]) < 128 and half_char) or
(x + font_size >= 128 and (not half_char or ord(string[char]) > 128))):
y += font_size
x = initial_x
# 回车
if string[char] == '\n':
y += font_size
x = initial_x
continue
# Tab
elif string[char] == '\t':
x = ((x // font_size) + 1) * font_size + initial_x % font_size
continue
# 其它的控制字符不显示
elif ord(string[char]) < 16:
continue
# 超过范围的字符不会显示*
if x > 128 or y > 64:
continue
byte_data = list(self.get_bitmap(string[char]))
# 反转
if reverse:
for _pixel in range(len(byte_data)):
byte_data[_pixel] = ~byte_data[_pixel] & 0xff
# 缩放和色彩*
if color > 1 or font_size != self.font_size:
bit_data = self._to_bit_list(byte_data, font_size)
if color > 1:
display.blit(
framebuf.FrameBuffer(bytearray(self._color_render(bit_data, color)), font_size, font_size,
framebuf.RGB565), x, y)
else:
display.blit(
framebuf.FrameBuffer(bytearray(self._bit_list_to_byte_data(bit_data)), font_size, font_size,
framebuf.MONO_HLSB), x, y)
else:
display.blit(framebuf.FrameBuffer(bytearray(byte_data), font_size, font_size, framebuf.MONO_HLSB), x, y)
# 英文字符半格显示
if ord(string[char]) < 128 and half_char:
x += font_size // 2
else:
x += font_size
收集整理了一份《2024年最新物联网嵌入式全套学习资料》，初衷也很简单，就是希望能够帮助到想自学提升的朋友。
一个人可以走的很快，但一群人才能走的更远！不论你是正从事IT行业的老鸟或是对IT行业感兴趣的新人
都欢迎加入我们的的圈子（技术交流、学习资源、职场吐槽、大厂内推、面试辅导），让我们一起学习成长！
