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int_to_bytes length fix for cat printer protocol

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NaitLee 2023-11-10 21:15:58 +08:00
parent 58077d4ca5
commit 87e5118229
1 changed files with 10 additions and 11 deletions
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21
printer_lib/commander.py
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@ -45,17 +45,16 @@ def reverse_bits(i: int):
i = ((i & 0b11001100) >> 2) | ((i & 0b00110011) << 2) i = ((i & 0b11001100) >> 2) | ((i & 0b00110011) << 2)
return ((i & 0b11110000) >> 4) | ((i & 0b00001111) << 4) return ((i & 0b11110000) >> 4) | ((i & 0b00001111) << 4)
def int_to_bytes(i: int, big_endian=False): def int_to_bytes(i: int, length=1, big_endian=False) -> bytes:
''' Turn `int` into `bytearray`, that have b = bytearray(length)
least bytes possible to represent the int p = 0
'''
result = bytearray()
while i != 0: while i != 0:
result.append(i & 0xff) b[p] = i & 0xff
i >>= 8 i >>= 8
p += 1
if big_endian: if big_endian:
result.reverse() b = reversed(b)
return result return bytes(b)
class Commander(metaclass=ABCMeta): class Commander(metaclass=ABCMeta):
''' Semi-abstract class, to be inherited by `PrinterDriver` ''' Semi-abstract class, to be inherited by `PrinterDriver`
@ -122,11 +121,11 @@ class Commander(metaclass=ABCMeta):
def retract_paper(self, pixels: int): def retract_paper(self, pixels: int):
'Retract the paper for some pixels' 'Retract the paper for some pixels'
self.send( self.make_command(0xa0, int_to_bytes(pixels)) ) self.send( self.make_command(0xa0, int_to_bytes(pixels, length=2)) )
def feed_paper(self, pixels: int): def feed_paper(self, pixels: int):
'Feed the paper for some pixels' 'Feed the paper for some pixels'
self.send( self.make_command(0xa1, int_to_bytes(pixels)) ) self.send( self.make_command(0xa1, int_to_bytes(pixels, length=2)) )
def set_speed(self, value: int): def set_speed(self, value: int):
''' Set how quick to feed/retract paper. **The lower, the quicker.** ''' Set how quick to feed/retract paper. **The lower, the quicker.**
@ -140,7 +139,7 @@ class Commander(metaclass=ABCMeta):
''' Set thermal energy, max to `0xffff` ''' Set thermal energy, max to `0xffff`
By default, it's seems around `0x3000` (1 / 5) By default, it's seems around `0x3000` (1 / 5)
''' '''
self.send( self.make_command(0xaf, int_to_bytes(amount)) ) self.send( self.make_command(0xaf, int_to_bytes(amount, length=2)) )
def draw_bitmap(self, bitmap_data: bytearray): def draw_bitmap(self, bitmap_data: bytearray):
'Print `bitmap_data`. Also does the bit-reversing job.' 'Print `bitmap_data`. Also does the bit-reversing job.'