From 55c3b0f80ac1cc4e15e1af496ab80c69014e975f Mon Sep 17 00:00:00 2001
From: Martin Brodbeck <martin@brodbeck-online.de>
Date: Mon, 30 May 2022 16:09:09 +0200
Subject: [PATCH] LCD class introduced

---
 lcd.cpp | 31 +++++++++++++++++++++++++++++++
 lcd.h   | 20 ++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 lcd.cpp
 create mode 100644 lcd.h

diff --git a/lcd.cpp b/lcd.cpp
new file mode 100644
index 0000000..54c0577
--- /dev/null
+++ b/lcd.cpp
@@ -0,0 +1,31 @@
+#include "lcd.h"
+
+constexpr uint8_t SHIFT_BACKLIGHT = 3;
+
+LCD::LCD(i2c_inst_t *i2c, const uint gpio_sda, const uint gpio_scl,
+         const uint8_t i2c_addr, uint8_t num_cols, uint8_t num_lines)
+    : i2c_addr{i2c_addr}, num_cols{num_cols}, num_lines{num_lines} {
+  i2c_init(i2c1, 100 * 1000);
+  gpio_set_function(gpio_sda, GPIO_FUNC_I2C);
+  gpio_set_function(gpio_scl, GPIO_FUNC_I2C);
+  gpio_pull_up(gpio_sda);
+  gpio_pull_up(gpio_scl);
+}
+
+int LCD::backlight_off() {
+  uint8_t data = 0;
+  int ret{0};
+
+  ret = i2c_write_blocking(i2c1, i2c_addr, &data, 1, false);
+
+  return ret;
+}
+
+int LCD::backlight_on() {
+  uint8_t data = 1 << SHIFT_BACKLIGHT;
+  int ret{0};
+
+  ret = i2c_write_blocking(i2c1, i2c_addr, &data, 1, false);
+
+  return ret;
+}
\ No newline at end of file
diff --git a/lcd.h b/lcd.h
new file mode 100644
index 0000000..72d173b
--- /dev/null
+++ b/lcd.h
@@ -0,0 +1,20 @@
+#ifndef LCD_H
+#define LCD_H
+
+#include "hardware/i2c.h"
+#include "pico/stdlib.h"
+
+class LCD {
+public:
+  LCD(i2c_inst_t *i2c, const uint gpio_sda, const uint gpio_scl,
+      const uint8_t i2c_addr, uint8_t num_cols = 16, uint8_t num_lines = 2);
+  int backlight_off();
+  int backlight_on();
+
+private:
+  uint8_t i2c_addr;
+  uint8_t num_cols;
+  uint8_t num_lines;
+};
+
+#endif
\ No newline at end of file