From 0d9ef55b449f003ca6aa0ec4adec1781c9c80aa7 Mon Sep 17 00:00:00 2001
From: Savanni D'Gerinel <savanni@luminescent-dreams.com>
Date: Sun, 26 Jun 2022 13:28:23 -0400
Subject: [PATCH] Add multi-line support

---
 display/display.c | 10 ++++++++--
 display/display.h |  2 ++
 lcd/main.c        |  5 +++--
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/display/display.c b/display/display.c
index 77bec1d..26c09b3 100644
--- a/display/display.c
+++ b/display/display.c
@@ -38,7 +38,7 @@ void display_init(display_t *disp) {
     sr_initialize(&disp->reg);
     set_line_direction(&disp->register_select, LINE_OUT);
     set_line_direction(&disp->enable, LINE_OUT);
-    write_instruction(disp, 0b00111100);
+    write_instruction(disp, 0b00111000);
 }
 
 void display_clear(display_t *disp) {
@@ -47,7 +47,13 @@ void display_clear(display_t *disp) {
 }
 
 void display_enable(display_t *disp) {
-    write_instruction(disp, 0x0e);
+    // write_instruction(disp, 0x0e);
+    write_instruction(disp, 0b00001100);
+}
+
+void display_set_location(display_t *disp, size_t column, size_t row) {
+    size_t addr = row * 40 + column;
+    write_instruction(disp, 0b10000000 | addr);
 }
 
 void display_write_message(display_t *disp, const char *msg) {
diff --git a/display/display.h b/display/display.h
index 4c373f5..dc60a0a 100644
--- a/display/display.h
+++ b/display/display.h
@@ -56,6 +56,8 @@ void display_clear(display_t *);
 
 void display_enable(display_t *);
 
+void display_set_location(display_t *, size_t, size_t);
+
 void display_write_message(display_t *, const char *);
 
 #endif
diff --git a/lcd/main.c b/lcd/main.c
index ff01164..037cff6 100644
--- a/lcd/main.c
+++ b/lcd/main.c
@@ -37,8 +37,9 @@ int main(void) {
     display_clear(&display);
     _delay_ms(500);
 
-    const char msg[] = "Hello, my bat";
-    display_write_message(&display, msg);
+    display_write_message(&display, "Hello, my bat");
+    display_set_location(&display, 0, 1);
+    display_write_message(&display, "  -- Savanni");
     display_enable(&display);
 
     set_line(&light);