From 461c4d178f20ee963c46b303a4f28fe6d462a9fa Mon Sep 17 00:00:00 2001
From: jonas <@DISTRIB_ID=Pop.com>
Date: Fri, 24 Nov 2023 19:01:35 +0100
Subject: [PATCH 1/4] Implement mapping for char -> u8

u8 in this case will be the byte, that can be displayed.
The mappings come from this this picture: https://www.meine-schaltung.de/notizbuch/anzeige/sieben_segment_zeichen/img/alphabet_a_z.jpg
---
 src/lib.rs | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 66be25f..a1fa5ae 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -157,3 +157,35 @@ const DIGITS: [u8; 16] = [
     0x7f, 0x6f, 0x77, 0x7c, //
     0x39, 0x5e, 0x79, 0x71, //
 ];
+
+fn char_to_raw(c: char) -> u8 {
+    match c {
+        'a' | 'A' => 0x77,
+        'b' | 'B' => 0x7c,
+        'c' | 'C' => 0x58,
+        'd' | 'D' => 0x5e,
+        'e' | 'E' => 0x79,
+        'f' | 'F' => 0x71,
+        'g' | 'G' => 0x3d,
+        'h' | 'H' => 0x74,
+        'i' | 'I' => 0x30,
+        'j' | 'J' => 0x1e,
+        'k' | 'K' => 0x75,
+        'l' | 'L' => 0x38,
+        'm' | 'M' => 0x55,
+        'n' | 'N' => 0x54,
+        'o' | 'O' => 0x5c,
+        'p' | 'P' => 0x73,
+        'q' | 'Q' => 0x67,
+        'r' | 'R' => 0x50,
+        's' | 'S' => 0x6d,
+        't' | 'T' => 0x78,
+        'u' | 'U' => 0x3e,
+        'v' | 'V' => 0x3e,
+        'w' | 'W' => 0x6a,
+        'x' | 'X' => 0x14,
+        'y' | 'Y' => 0x6e,
+        'z' | 'Z' => 0x5b,
+        _ => 0x00,
+    }
+}

From 2d9927d50a391495e170329830518c782b35cca3 Mon Sep 17 00:00:00 2001
From: jonas <@DISTRIB_ID=Pop.com>
Date: Fri, 24 Nov 2023 19:03:53 +0100
Subject: [PATCH 2/4] Implement function for printing chars

---
 src/lib.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index a1fa5ae..8deff49 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -57,6 +57,11 @@ where
         self.print_raw_iter(address, bytes.iter().map(|b| *b))
     }
 
+    pub fn print_chars(&mut self, address: u8, chars: &[char]) -> Res<E> {
+        self.print_raw_iter(address, chars.iter().map(|b| char_to_raw(*b)))?;
+        Ok(())
+    }
+
     pub fn print_hex(&mut self, address: u8, digits: &[u8]) -> Res<E> {
         self.print_raw_iter(
             address,

From 067ef6b2d60d0a954fff4bb1e9c0478b6f24788f Mon Sep 17 00:00:00 2001
From: jonas <@DISTRIB_ID=Pop.com>
Date: Sat, 25 Nov 2023 12:23:38 +0100
Subject: [PATCH 3/4] Update README

---
 README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/README.md b/README.md
index 78241b8..43e3847 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@
 [![Released API docs](https://docs.rs/tm1637/badge.svg)](https://docs.rs/tm1637)
 
 ## Features
+- Printing Chars, HEX digits and RAW digits
 - Formatting number as HEX-digits
 - Controlling each particular segment using a bitmask
 - Brightness control

From 15a62b20e71de9ad560739d5f8c4fa39aced4cec Mon Sep 17 00:00:00 2001
From: jonas <@DISTRIB_ID=Pop.com>
Date: Sat, 23 Dec 2023 11:39:48 +0100
Subject: [PATCH 4/4] Introduce feature flag `chars`

---
 Cargo.toml | 4 ++++
 src/lib.rs | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index 44aedf2..babd205 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -35,3 +35,7 @@ codegen-units = 1
 debug = true
 lto = true
 opt-level = 'z'
+
+[features]
+default = []
+chars = []
diff --git a/src/lib.rs b/src/lib.rs
index 8deff49..92a7315 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -57,6 +57,7 @@ where
         self.print_raw_iter(address, bytes.iter().map(|b| *b))
     }
 
+    #[cfg(feature = "chars")]
     pub fn print_chars(&mut self, address: u8, chars: &[char]) -> Res<E> {
         self.print_raw_iter(address, chars.iter().map(|b| char_to_raw(*b)))?;
         Ok(())
@@ -163,6 +164,7 @@ const DIGITS: [u8; 16] = [
     0x39, 0x5e, 0x79, 0x71, //
 ];
 
+#[cfg(feature = "chars")]
 fn char_to_raw(c: char) -> u8 {
     match c {
         'a' | 'A' => 0x77,