From d892d1c6b09613e95faaaa27640a2b17a0768cb1 Mon Sep 17 00:00:00 2001
From: "Andres O. Vela" <andresovela@gmail.com>
Date: Sun, 14 Feb 2021 15:10:52 +0100
Subject: [PATCH 1/2] Return DCError instead of BusWriteError on DC signal
 assertion errors

---
 CHANGELOG.md             | 4 ++++
 parallel-gpio/src/lib.rs | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b65de5e..c9db1e8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+### Changed
+
+- Return `DCError` instead of `BusWriteError` on errors (de-)asserting the DC signal in 8-bit GPIO interfaces
+
 ## [v0.4.0] - 2020-05-25
 
 ### Added
diff --git a/parallel-gpio/src/lib.rs b/parallel-gpio/src/lib.rs
index 43b6a77..cf5fe32 100644
--- a/parallel-gpio/src/lib.rs
+++ b/parallel-gpio/src/lib.rs
@@ -187,7 +187,7 @@ where
 {
     fn send_commands(&mut self, cmds: DataFormat<'_>) -> Result<(), DisplayError> {
         use byte_slice_cast::*;
-        self.dc.set_low().map_err(|_| DisplayError::BusWriteError)?;
+        self.dc.set_low().map_err(|_| DisplayError::DCError)?;
         match cmds {
             DataFormat::U8(slice) => slice.iter().try_for_each(|cmd| {
                 self.wr.set_low().map_err(|_| DisplayError::BusWriteError)?;
@@ -240,7 +240,7 @@ where
         use byte_slice_cast::*;
         self.dc
             .set_high()
-            .map_err(|_| DisplayError::BusWriteError)?;
+            .map_err(|_| DisplayError::DCError)?;
         match buf {
             DataFormat::U8(slice) => slice.iter().try_for_each(|d| {
                 self.wr.set_low().map_err(|_| DisplayError::BusWriteError)?;

From f5973903e3fb8286ea0e9c94e5a573dfbcfe7d4f Mon Sep 17 00:00:00 2001
From: "Andres O. Vela" <andresovela@gmail.com>
Date: Sun, 14 Feb 2021 15:29:12 +0100
Subject: [PATCH 2/2] Ran cargo fmt

---
 parallel-gpio/src/lib.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/parallel-gpio/src/lib.rs b/parallel-gpio/src/lib.rs
index cf5fe32..82a4d3e 100644
--- a/parallel-gpio/src/lib.rs
+++ b/parallel-gpio/src/lib.rs
@@ -238,9 +238,7 @@ where
 
     fn send_data(&mut self, buf: DataFormat<'_>) -> Result<(), DisplayError> {
         use byte_slice_cast::*;
-        self.dc
-            .set_high()
-            .map_err(|_| DisplayError::DCError)?;
+        self.dc.set_high().map_err(|_| DisplayError::DCError)?;
         match buf {
             DataFormat::U8(slice) => slice.iter().try_for_each(|d| {
                 self.wr.set_low().map_err(|_| DisplayError::BusWriteError)?;