https://github.com/lc044/mcu
使用microPython开发单片机
https://github.com/lc044/mcu
esp32 mcu micropython
Last synced: 3 months ago
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使用microPython开发单片机
- Host: GitHub
- URL: https://github.com/lc044/mcu
- Owner: LC044
- License: gpl-3.0
- Created: 2022-07-19T15:56:47.000Z (almost 3 years ago)
- Default Branch: main
- Last Pushed: 2023-04-04T09:24:48.000Z (about 2 years ago)
- Last Synced: 2025-03-24T18:21:37.479Z (3 months ago)
- Topics: esp32, mcu, micropython
- Language: Python
- Homepage:
- Size: 29.1 MB
- Stars: 33
- Watchers: 2
- Forks: 12
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# 单片机实现utf-8转gb2312
我们在单片机开发中常会遇到需要将UTF-8转换为GBK编码的需求。在了解各种编码格式的情况下可知， UFT-8不能直接转成GBK，需中转成unicode再转换为gbk。而unicode和gbk之间没有算法可以直接计算，需要查表方式获取。
网上有一些C语言实现的代码，我这里分享一种microPython的实现代码
接下来就是要考虑表的存储方式了，刚开始我想着把表存到代码里直接通过索引实现编码转换。但是gb2312有七千多个字符全部存储要耗费很大内存，即使是32位的esp32也只有512k的内存，加上其他资源的消耗，剩余的内存不足以存储编码转换表。
于是只能将表保存成一个文件（转化成bin文件会比较好，方法类似），通过读写文件来减少内存开销。
具体的查表就是简单的二分法
## 代码实现：
```python
class utf8_gb2312(object):
def __init__(self):
self.f = open('font.txt', 'r', encoding='utf-8')
def b2i(self, byte): # bytes转int
r = 0
for i in range(len(byte)):
r = (r << 8) + byte[i]
return r
def i2b(self, num): # int转bytes
num = int(num, 16)
return num.to_bytes(2, 'big')
def one_char(self, char): # 将一个字符转化成gb2312
utf_byte = char.encode('utf-8')
r = self.B_S(0, 7296, self.b2i(utf_byte))
gb2312_byte = self.i2b(r)
# print(gb2312_byte)
return gb2312_byte
def str(self, st): # 将字符串转化成gb2312
r = b''
for s in st:
# print(s.encode('utf-8'))
if len(s.encode('utf-8')) <= 1:
r += s.encode('utf-8')
else:
r += self.one_char(s)
return r
def B_S(self, low, high, m): # 二分查找
if 0 <= low <= high <= 7296:
mid = (low + high) // 2
self.f.seek(mid * 12)
data = self.f.read(12)
utf = data[0:6]
if int(utf, 16) < m:
return self.B_S(mid + 1, high, m)
elif int(utf, 16) > m:
return self.B_S(low, mid - 1, m)
else:
return data[7:-1]
def __del__(self):
self.f.close()
if __name__ == '__main__':
font = utf8_gb2312()
r = font.one_char('起')
print(r.decode('gb2312'))
r = font.str('起风了Abc123-')
print(r)
print(r.decode('gb2312'))
```
## 附件下载地址：
https://github.com/LC044/MCU