Diff: I2CLCD.cpp

Revision:

0:b069b7027af2

Child:

1:bf21aa3f7cdc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/I2CLCD.cpp	Thu Oct 14 14:45:30 2010 +0000
@@ -0,0 +1,174 @@
+/*
+ * mbed library to use a I2C LCD
+ * Copyright (c) 2010 Hiroshi Suga
+ * Released under the MIT License: http://mbed.org/license/mit
+ */
+
+#include "mbed.h"
+#include "I2CLCD.h"
+
+#define I2CLCD_ADDR 0x7c
+
+
+int I2CLCD::_putc (int value) {
+
+    if (value == '\n') {
+        x = 0;
+        y ++;
+        if (y >= rows()) {
+            y = 0;
+            lcd_out(address(x, y), 0);
+        }
+
+    } else {
+
+        lcd_out(address(x, y), 0);
+        lcd_out(value, 1);
+        x ++;
+        if (x >= cols()) {
+            x = 0;
+            y ++;
+            if (y >= rows()) {
+                y = 0;
+                lcd_out(address(x, y), 0);
+            }
+        }
+    }
+
+    return value;
+}
+
+int I2CLCD::_getc() {
+    return lcd_in(0);
+}
+
+
+I2CLCD::I2CLCD (PinName p_sda, PinName p_scl, I2CLCDType p_type, I2CLCDConfig p_config) : i2c(p_sda, p_scl) {
+    init(p_type, p_config);
+}
+
+I2CLCD::I2CLCD (I2C& p_i2c, I2CLCDType p_type, I2CLCDConfig p_config) : i2c(p_i2c) {
+    init(p_type, p_config);
+}
+
+void I2CLCD::init (I2CLCDType p_type, I2CLCDConfig p_config) {
+
+    type = p_type;
+
+    lcd_cfg(p_config);
+
+    wait(0.5);
+    lcd_out(0x30, 0);
+    wait(0.005);
+    lcd_out(0x30, 0);
+    wait(0.002);
+    lcd_out(0x30, 0);
+
+    lcd_out(0x38, 0); // func 
+    lcd_out(0x10, 0); // shift
+    lcd_out(0x0c, 0); // display
+    lcd_out(0x06, 0); // entry mode
+    cls();
+}
+
+void I2CLCD::cls() {
+    lcd_out(0x01, 0); // clear
+    wait(0.002);
+    lcd_out(0x02, 0); // home
+    wait(0.002);
+    locate(0, 0);
+}
+
+void I2CLCD::locate(int col, int row) {
+    x = col;
+    y = row;
+    lcd_out(address(x, y), 0);
+}
+
+int I2CLCD::address(int col, int row) {
+    switch (type) {
+        case LCD16x1:
+            return (col < 8 ? 0x80 : 0xc0) + (col & 0x03);
+        case LCD16x4:
+        case LCD20x4:
+            switch (row) {
+                case 0:
+                    return 0x80 + col;
+                case 1:
+                    return 0xc0 + col;
+                case 2:
+                    return 0x94 + col;
+                case 3:
+                    return 0xd4 + col;
+            }
+        case LCD16x2B:
+            return 0x80 + (row * 40) + col;
+        case LCD8x2:
+        case LCD16x2:
+        case LCD20x2:
+        default:
+            return 0x80 + (row * 0x40) + col;
+    }
+}
+
+int I2CLCD::cols() {
+    switch (type) {
+        case LCD8x2:
+            return 8;
+        case LCD20x4:
+        case LCD20x2:
+            return 20;
+        case LCD16x1:
+        case LCD16x2:
+        case LCD16x2B:
+        case LCD16x4:
+        default:
+            return 16;
+    }
+}
+
+int I2CLCD::rows() {
+    switch (type) {
+        case LCD16x1:
+            return 1;
+        case LCD16x4:
+        case LCD20x4:
+            return 4;
+        case LCD8x2:
+        case LCD16x2:
+        case LCD16x2B:
+        case LCD20x2:
+        default:
+            return 2;
+    }
+}
+
+void I2CLCD::lcd_cfg (I2CLCDConfig cfg) {
+    i2c.start();
+    i2c.write(I2CLCD_ADDR);
+    i2c.write(LCDCFG_ENABLE | (cfg & 0x1f));
+    i2c.stop();
+}
+
+void I2CLCD::lcd_out (int dat, int rs) {
+    i2c.start();
+    i2c.write(I2CLCD_ADDR);
+    i2c.write(rs ? 0x40 : 0);
+    i2c.write(dat);
+    i2c.stop();
+}
+
+int I2CLCD::lcd_in (int rs) {
+    int i;
+
+    i2c.start();
+    i2c.write(I2CLCD_ADDR);
+    i2c.write(rs ? 0x40 : 0);
+
+    i2c.start();
+    i2c.write(I2CLCD_ADDR | 0x01);
+    i = i2c.read(0);
+    i2c.stop();
+
+    return i;
+}