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Merge pull request #420 from newtonick/larger-spidev-buffer

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Update ST7789 to support writing to larger SPIDEV buffer
This commit is contained in:
Nick Klockenga
2023-08-04 13:28:43 -04:00
committed by GitHub
parent b7e5252fab 3276628e2f
commit 886391bbf0
3 changed files with 10 additions and 5 deletions
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docs/manual_installation.md
+7
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@@ -215,6 +215,13 @@ workon seedsigner-env
pwd pwd
``` ```
### Optional: increase spidev buffer size
This allows `ST7789.py` to update the LCD without performing multiple write operations because the default buffer size is 4096 bytes. The default can be changed via the `/boot/cmdline.txt` file. You will need to add `spidev.bufsiz=131072` to the end of this single lined file command.
Example `cmdline.txt` contents:
```
console=serial0,115200 console=tty1 root=PARTUUID=2fa4ba7e-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait modules-load=dwc2,g_ether spidev.bufsiz=131072
```
### Configure `systemd` to run SeedSigner at boot: ### Configure `systemd` to run SeedSigner at boot:
src/seedsigner/gui/screens/scan_screens.py
+1 -1
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@@ -44,7 +44,7 @@ class ScanScreen(BaseScreen):
decoder: DecodeQR = None decoder: DecodeQR = None
instructions_text: str = "< back | Scan a QR code" instructions_text: str = "< back | Scan a QR code"
resolution: tuple[int,int] = (480, 480) resolution: tuple[int,int] = (480, 480)
framerate: int = 5 # TODO: alternate optimization for Pi Zero 2W? framerate: int = 6 # TODO: alternate optimization for Pi Zero 2W?
render_rect: tuple[int,int,int,int] = None render_rect: tuple[int,int,int,int] = None
src/seedsigner/hardware/ST7789.py
+2 -4
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@@ -159,13 +159,11 @@ class ST7789(object):
pix = arr.tobytes() pix = arr.tobytes()
self.SetWindows ( 0, 0, self.width, self.height) self.SetWindows ( 0, 0, self.width, self.height)
GPIO.output(self._dc,GPIO.HIGH) GPIO.output(self._dc,GPIO.HIGH)
for i in range(0,len(pix),4096): self._spi.writebytes2(pix)
self._spi.writebytes(pix[i:i+4096])
def clear(self): def clear(self):
"""Clear contents of image buffer""" """Clear contents of image buffer"""
_buffer = [0xff]*(self.width * self.height * 2) _buffer = [0xff]*(self.width * self.height * 2)
self.SetWindows ( 0, 0, self.width, self.height) self.SetWindows ( 0, 0, self.width, self.height)
GPIO.output(self._dc,GPIO.HIGH) GPIO.output(self._dc,GPIO.HIGH)
for i in range(0,len(_buffer),4096): self._spi.writebytes2(_buffer)
self._spi.writebytes(_buffer[i:i+4096])