From 96e25dfb342367afd9f334e6c53e94caa391aa44 Mon Sep 17 00:00:00 2001
From: peterhinch <peter@hinch.me.uk>
Date: Tue, 14 Mar 2023 17:00:32 +0000
Subject: [PATCH] Add pico_epaper_42_part partial update driver.

---
 DRIVERS.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/DRIVERS.md b/DRIVERS.md
index c4eaa24..e56ac46 100644
--- a/DRIVERS.md
+++ b/DRIVERS.md
@@ -1239,6 +1239,17 @@ following constructor args:
  * `busy=None` A `Pin` instance defined as `Pin.IN, Pin.PULL_UP`.
  * `asyn=False` Set `True` for asynchronous applications.
 
+An alternative driver supporting partial updates is `pico_epaper_42_part.py`.
+Usage is as above, but the driver supports two methods:
+ * `set_partial()`
+ * `set_full()`
+After issuing `set_partial()`, subsequent updates will be partial. Normal
+updates are restored by issuing `set_full()`. These should not be issued while
+an update is in progress.
+
+Partial updates are fast and visually unobtrusive but they are prone to
+ghosting.
+
 ###### [Contents](./DRIVERS.md#contents)
 
 # 6. EPD Asynchronous support