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Pico ePaper drivers: add code comment.

pull/80/head
Peter Hinch 2024-10-12 10:24:44 +01:00
rodzic 66e1ab6459
commit 4e27b3469a
2 zmienionych plików z 10 dodań i 7 usunięć
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2
drivers/epaper/pico_epaper_42_v2.py
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@ -37,6 +37,8 @@
# Another wiki: https://www.waveshare.com/wiki/4.2inch_e-Paper_Module_Manual#Introduction # Another wiki: https://www.waveshare.com/wiki/4.2inch_e-Paper_Module_Manual#Introduction
# Code: https://github.com/waveshareteam/Pico_ePaper_Code/blob/main/python/Pico-ePaper-4.2_V2.py # Code: https://github.com/waveshareteam/Pico_ePaper_Code/blob/main/python/Pico-ePaper-4.2_V2.py
# Chip appears to be SSD1683.
from machine import Pin, SPI from machine import Pin, SPI
import framebuf import framebuf
import time import time

15
drivers/epaper/pico_epaper_42_v2_gs.py
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@ -28,7 +28,8 @@
# LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE. # THE SOFTWARE.
#
# Chip appears to be SSD1683.
from machine import Pin, SPI from machine import Pin, SPI
import framebuf import framebuf
@ -55,7 +56,7 @@ _DC_PIN = const(8)
_CS_PIN = const(9) _CS_PIN = const(9)
_BUSY_PIN = const(13) _BUSY_PIN = const(13)
_WHITE = 0xff # white _WHITE = 0xFF # white
_LIGHT_GREY = 0xC0 _LIGHT_GREY = 0xC0
_DARK_GREY = 0x80 # gray _DARK_GREY = 0x80 # gray
_BLACK = 0x00 # Blackest _BLACK = 0x00 # Blackest
@ -96,7 +97,7 @@ def _lmap(dest: ptr8, source: ptr8, pattern: int, length: int):
class EPD(framebuf.FrameBuffer): class EPD(framebuf.FrameBuffer):
MAXBLOCK = 25 # Max async blocking time in ms MAXBLOCK = 25 # Max async blocking time in ms
# A monochrome approach should be used for coding this. The rgb method ensures # A monochrome approach should be used for coding this. The rgb method ensures
# nothing breaks if users specify colors. # nothing breaks if users specify colors.
@staticmethod @staticmethod
@ -108,9 +109,7 @@ class EPD(framebuf.FrameBuffer):
self._busy_pin = Pin(_BUSY_PIN, Pin.IN, Pin.PULL_UP) if busy is None else busy self._busy_pin = Pin(_BUSY_PIN, Pin.IN, Pin.PULL_UP) if busy is None else busy
self._cs = Pin(_CS_PIN, Pin.OUT) if cs is None else cs self._cs = Pin(_CS_PIN, Pin.OUT) if cs is None else cs
self._dc = Pin(_DC_PIN, Pin.OUT) if dc is None else dc self._dc = Pin(_DC_PIN, Pin.OUT) if dc is None else dc
self._spi = ( self._spi = SPI(1, sck=Pin(10), mosi=Pin(11), miso=Pin(28)) if spi is None else spi
SPI(1, sck=Pin(10), mosi=Pin(11), miso=Pin(28)) if spi is None else spi
)
self._spi.init(baudrate=4_000_000) self._spi.init(baudrate=4_000_000)
# Busy flag: set immediately on .show(). Cleared when busy pin is logically false. # Busy flag: set immediately on .show(). Cleared when busy pin is logically false.
self._busy = False self._busy = False
@ -216,7 +215,7 @@ class EPD(framebuf.FrameBuffer):
time.sleep_ms(100) time.sleep_ms(100)
def set_partial(self): def set_partial(self):
pass pass
def set_full(self): def set_full(self):
pass pass
@ -242,6 +241,7 @@ class EPD(framebuf.FrameBuffer):
nbytes = len(self._ibuf) # Bytes to send nbytes = len(self._ibuf) # Bytes to send
didx = nbytes * 2 # Increment of framebuf index didx = nbytes * 2 # Increment of framebuf index
nleft = len(self._buf) # Size of framebuf nleft = len(self._buf) # Size of framebuf
def inner(): def inner():
nonlocal fbidx nonlocal fbidx
nonlocal nbytes nonlocal nbytes
@ -256,6 +256,7 @@ class EPD(framebuf.FrameBuffer):
if asyn and time.ticks_diff(time.ticks_ms(), ts) > EPD.MAXBLOCK: if asyn and time.ticks_diff(time.ticks_ms(), ts) > EPD.MAXBLOCK:
return nbytes # Probably not all done; quit and call again return nbytes # Probably not all done; quit and call again
return 0 # All done return 0 # All done
return inner return inner
async def _as_show(self): async def _as_show(self):