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hd44780: Use two separate text framebuffers 

There is concern that some lcd boards that emulate the hd44780 don't
support text updates that wrap the two text framebuffers.  Update the
code to treat the two text areas as two separate framebuffers.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-12-01 19:11:03 -05:00
parent 41dd53f62c
commit 2e7f38eadd
1 changed files with 10 additions and 9 deletions
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19
klippy/extras/display/hd44780.py
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@ -28,11 +28,12 @@ class HD44780:
self.mcu.register_config_callback(self.build_config)
self.send_data_cmd = self.send_cmds_cmd = None
# framebuffers
self.text_framebuffer = bytearray(' '*80)
self.text_framebuffers = [bytearray(' '*40), bytearray(' '*40)]
self.glyph_framebuffer = bytearray(64)
self.all_framebuffers = [
# Text framebuffer
(self.text_framebuffer, bytearray('~'*80), 0x80),
# Text framebuffers
(self.text_framebuffers[0], bytearray('~'*40), 0x80),
(self.text_framebuffers[1], bytearray('~'*40), 0xc0),
# Glyph framebuffer
(self.glyph_framebuffer, bytearray('~'*64), 0x40) ]
def build_config(self):
@ -71,8 +72,6 @@ class HD44780:
# Transmit changes
for pos, count in diffs:
chip_pos = pos
if fb_id == 0x80 and pos >= 40:
chip_pos += 0x40 - 40
self.send([fb_id + chip_pos])
self.send(new_data[pos:pos+count], is_data=True)
old_data[:] = new_data
@ -89,13 +88,13 @@ class HD44780:
# Add custom fonts
self.glyph_framebuffer[:len(HD44780_chars)] = HD44780_chars
for i in range(len(self.glyph_framebuffer)):
self.all_framebuffers[1][1][i] = self.glyph_framebuffer[i] ^ 1
self.all_framebuffers[2][1][i] = self.glyph_framebuffer[i] ^ 1
self.flush()
def write_text(self, x, y, data):
if x + len(data) > 20:
data = data[:20 - min(x, 20)]
pos = [0, 40, 20, 60][y] + x
self.text_framebuffer[pos:pos+len(data)] = data
pos = x + ((y & 0x02) >> 1) * 20
self.text_framebuffers[y & 1][pos:pos+len(data)] = data
def write_glyph(self, x, y, glyph_name):
char = TextGlyphs.get(glyph_name)
if char is not None:
@ -104,7 +103,9 @@ class HD44780:
return 1
return 0
def clear(self):
self.text_framebuffer[:] = ' '*80
spaces = ' ' * 40
self.text_framebuffers[0][:] = spaces
self.text_framebuffers[1][:] = spaces
def get_dimensions(self):
return (20, 4)