From e4d6284485d2350071d1fd77617cd928877e8b3d Mon Sep 17 00:00:00 2001
From: Thierry Carrard <thierry@carrard.org>
Date: Mon, 20 Jan 2025 12:46:01 +0100
Subject: [PATCH] add 8x5 font text print feature to pcd8544.py

Use 8x5 fonts for clearer and denser text on the PCD8544. font is the one found in various Arduino libraries and projects, just converted to a binary file and loaded upon class instanciation.
---
 pcd8544.py | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/pcd8544.py b/pcd8544.py
index bac58e8..3f89c22 100644
--- a/pcd8544.py
+++ b/pcd8544.py
@@ -199,3 +199,36 @@ def fill_rect(self, x, y, w, h, col):
 
 	def show(self):
 		self.data(self.buf)
+
+# for clearer and smaller text.
+# It uses the same 8x5 font as used in arduino libraries
+# the file font8x5.bin stores 5 bytes of data (for 5 pixels wide characters)
+# for each of 96 ASCII characters starting from character ' ' (ASCII code 32).
+# font8x5.bin can be found here :
+# https://github.com/carrardt/TiPiDuino/raw/refs/heads/main/tools/bitmap/font8x5.bin
+# Note: text printed with println function scrolls,
+# thanks to screen member storing previous text lines
+class PCD8544_BM8x5(PCD8544):
+  def __init__(self, spi, cs, dc, rst=None):
+    super().__init__(spi, cs, dc, rst)
+    self.font8x5 = open('font8x5.bin','rb').read()
+    self.screen = []
+
+  def text(self, col, row, s):
+    self.position(col,row)
+    for c in s:
+      ci = (ord(c)-ord(' '))*5
+      if (ci+5)>len(self.font8x5): ci = 0
+      cbm=bytearray(self.font8x5[ci:ci+5])
+      cbm.append(0x00)
+      self.data(cbm)
+
+  def println(self,s):
+    if len(self.screen)>=6:
+      self.screen.pop(0)
+    self.screen.append(s[:14])
+    r=0
+    self.clear()
+    for l in self.screen:
+      self.text(0,r,l)
+      r=r+1