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st7920: Simplify framebuffer access 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2018-09-20 14:04:34 -04:00 committed by KevinOConnor
parent 05ba62600c
commit 742d6481a9
1 changed files with 18 additions and 13 deletions
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31
klippy/extras/display/st7920.py
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@ -34,12 +34,17 @@ class ST7920:
self.send_data_cmd = self.send_cmds_cmd = None
self.is_extended = False
# framebuffers
self.text_framebuffer = (bytearray(' '*64), bytearray('~'*64), 0x80)
self.glyph_framebuffer = (bytearray(128), bytearray('~'*128), 0x40)
self.graphics_framebuffers = [(bytearray(32), bytearray('~'*32), i)
for i in range(32)]
self.framebuffers = ([self.text_framebuffer, self.glyph_framebuffer]
+ self.graphics_framebuffers)
self.text_framebuffer = bytearray(' '*64)
self.glyph_framebuffer = bytearray(128)
self.graphics_framebuffers = [bytearray(32) for i in range(32)]
self.all_framebuffers = [
# Text framebuffer
(self.text_framebuffer, bytearray('~'*64), 0x80),
# Glyph framebuffer
(self.glyph_framebuffer, bytearray('~'*128), 0x40),
# Graphics framebuffers
] + [(self.graphics_framebuffers[i], bytearray('~'*32), i)
for i in range(32)]
self.cached_glyphs = {}
def build_config(self):
self.mcu.add_config_cmd(
@ -67,7 +72,7 @@ class ST7920:
#logging.debug("st7920 %d %s", is_data, repr(cmds))
def flush(self):
# Find all differences in the framebuffers and send them to the chip
for new_data, old_data, fb_id in self.framebuffers:
for new_data, old_data, fb_id in self.all_framebuffers:
if new_data == old_data:
continue
# Find the position of all changed bytes in this framebuffer
@ -114,13 +119,13 @@ class ST7920:
for i, bits in enumerate(icon):
pos = glyph_id*32 + i*2
data = [(bits >> 8) & 0xff, bits & 0xff]
self.glyph_framebuffer[0][pos:pos+len(data)] = data
self.glyph_framebuffer[pos:pos+len(data)] = data
self.cached_glyphs[glyph_name] = (0, glyph_id*2)
def write_text(self, x, y, data):
if x + len(data) > 16:
data = data[:16 - min(x, 16)]
pos = [0, 32, 16, 48][y] + x
self.text_framebuffer[0][pos:pos+len(data)] = data
self.text_framebuffer[pos:pos+len(data)] = data
def write_graphics(self, x, y, row, data):
if x + len(data) > 16:
data = data[:16 - min(x, 16)]
@ -128,7 +133,7 @@ class ST7920:
if gfx_fb >= 32:
gfx_fb -= 32
x += 16
self.graphics_framebuffers[gfx_fb][0][x:x+len(data)] = data
self.graphics_framebuffers[gfx_fb][x:x+len(data)] = data
def write_glyph(self, x, y, glyph_name):
glyph_id = self.cached_glyphs.get(glyph_name)
if glyph_id is not None and x & 1 == 0:
@ -154,7 +159,7 @@ class ST7920:
return 1
return 0
def clear(self):
self.text_framebuffer[0][:] = ' '*64
self.text_framebuffer[:] = ' '*64
zeros = bytearray(32)
for new_data, old_data, fb_id in self.graphics_framebuffers:
new_data[:] = zeros
for gfb in self.graphics_framebuffers:
gfb[:] = zeros