jhd1313m1: Initial C implementation

Signed-off-by: Jon Trulson <jtrulson@ics.com>

src/jhd1313m1/hd44780_bits.h

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+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2015 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#pragma once
+
+// This file contains bit definitions for the HD44780 and compatible
+// LCD controllers.  It is used primarily my the lcm1602 driver and
+// it's derivatives.
+//
+// Those values (DATA, CMD) are specific to the implementation of the
+// i2C expander in use, so may not be appropriate for inclusion into
+// this file.  But for now, we will leave them here.
+
+#include <stdint.h>
+
+// commands
+const uint8_t HD44780_CLEARDISPLAY = 0x01;
+const uint8_t HD44780_RETURNHOME = 0x02;
+const uint8_t HD44780_ENTRYMODESET = 0x04;
+const uint8_t HD44780_DISPLAYCONTROL = 0x08;
+const uint8_t HD44780_CURSORSHIFT = 0x10;
+const uint8_t HD44780_FUNCTIONSET = 0x20;
+
+// flags for display entry mode
+const uint8_t HD44780_ENTRYRIGHT = 0x00;
+const uint8_t HD44780_ENTRYLEFT = 0x02;
+const uint8_t HD44780_ENTRYSHIFTINCREMENT = 0x01;
+const uint8_t HD44780_ENTRYSHIFTDECREMENT = 0x00;
+
+// flags for display on/off control
+const uint8_t HD44780_DISPLAYON = 0x04;
+const uint8_t HD44780_DISPLAYOFF = 0x00;
+const uint8_t HD44780_CURSORON = 0x02;
+const uint8_t HD44780_CURSOROFF = 0x00;
+const uint8_t HD44780_BLINKON = 0x01;
+const uint8_t HD44780_BLINKOFF = 0x00;
+
+// flags for display/cursor shift
+const uint8_t HD44780_DISPLAYMOVE = 0x08;
+const uint8_t HD44780_MOVERIGHT = 0x04;
+const uint8_t HD44780_MOVELEFT = 0x00;
+
+// flags for function set
+const uint8_t HD44780_8BITMODE = 0x10;
+const uint8_t HD44780_4BITMODE = 0x00;
+const uint8_t HD44780_2LINE = 0x08;
+const uint8_t HD44780_1LINE = 0x00;
+const uint8_t HD44780_5x10DOTS = 0x04;
+const uint8_t HD44780_5x8DOTS = 0x00;
+
+// flags for CGRAM
+const uint8_t HD44780_SETCGRAMADDR = 0x40;
+
+// may be implementation specific
+const uint8_t HD44780_EN = 0x04; // Enable bit
+const uint8_t HD44780_RW = 0x02; // Read/Write bit
+const uint8_t HD44780_RS = 0x01; // Register select bit
+const uint8_t HD44780_DATA = 0x40;
+const uint8_t HD44780_CMD = 0x80;
+
+const uint8_t HD44780_BACKLIGHT = 0x08;
+const uint8_t HD44780_NOBACKLIGHT = 0x00;