custom chars support

1 files changed, 50 insertions, 0 deletions

diff --git a/src/custom_char.rs b/src/custom_char.rs
new file mode 100644
index 0000000..47f99f5
--- /dev/null
+++ b/src/custom_char.rs
@@ -0,0 +1,50 @@
+/// X axis mirror of a custom LCD character
+pub const fn mirror_x(src: [u8; 8]) -> [u8; 8] {
+    // const fn do not support for loops currently, hence manual unroll
+    [
+        src[0].reverse_bits() >> 3,
+        src[1].reverse_bits() >> 3,
+        src[2].reverse_bits() >> 3,
+        src[3].reverse_bits() >> 3,
+        src[4].reverse_bits() >> 3,
+        src[5].reverse_bits() >> 3,
+        src[6].reverse_bits() >> 3,
+        src[7].reverse_bits() >> 3,
+    ]
+}
+
+/// Y axis mirror of a custom LCD character
+pub const fn mirror_y(src: [u8; 8]) -> [u8; 8] {
+    // const fn do not support for loops currently, hence manual unroll
+    [
+        src[7], src[6], src[5], src[4], src[3], src[2], src[1], src[0],
+    ]
+}
+
+#[cfg_attr(rustfmt, rustfmt_skip)]
+pub const RIGHT_ARROW: [u8; 8] = [
+    0b00000,
+    0b01000,
+    0b01100,
+    0b01110,
+    0b01100,
+    0b01000,
+    0b00000,
+    0b00000,
+];
+
+pub const LEFT_ARROW: [u8; 8] = mirror_x(RIGHT_ARROW);
+
+#[cfg_attr(rustfmt, rustfmt_skip)]
+pub const UP_ARROW: [u8; 8] = [
+    0b00000,
+    0b00000,
+    0b00100,
+    0b01110,
+    0b11111,
+    0b00000,
+    0b00000,
+    0b00000,
+];
+
+pub const DOWN_ARROW: [u8; 8] = mirror_y(UP_ARROW);