From 6c8ac87c7d649c1f403de198c24e345ae15be3fc Mon Sep 17 00:00:00 2001
From: BuggStream <buggstream@tuta.io>
Date: Sun, 7 Feb 2021 01:19:30 +0100
Subject: [PATCH] Ensure device is ready to receive data when updating frame

---
 src/epd1in54c/mod.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/epd1in54c/mod.rs b/src/epd1in54c/mod.rs
index 6ca626a..d453bfe 100644
--- a/src/epd1in54c/mod.rs
+++ b/src/epd1in54c/mod.rs
@@ -99,6 +99,8 @@ where
     }
 
     fn update_achromatic_frame(&mut self, spi: &mut SPI, black: &[u8]) -> Result<(), SPI::Error> {
+        self.wait_until_idle();
+
         self.interface
             .cmd(spi, Command::DATA_START_TRANSMISSION_1)?;
         self.interface.data(spi, black)?;
@@ -110,6 +112,8 @@ where
         spi: &mut SPI,
         chromatic: &[u8],
     ) -> Result<(), SPI::Error> {
+        self.wait_until_idle();
+
         self.interface
             .cmd(spi, Command::DATA_START_TRANSMISSION_2)?;
         self.interface.data(spi, chromatic)?;