Diff: lcd_2wire.cpp

Revision:

0:23e6b8ed8dbd

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lcd_2wire.cpp	Sun Dec 25 17:33:53 2011 +0000
@@ -0,0 +1,192 @@
+#include "mbed.h"
+#include "lcd_2wire.h"
+
+
+lcd_2wire::lcd_2wire (PinName pinc, PinName pind ): _pinc(pinc),  _pind(pind) {
+    _pinc = 0;//clock signal
+    _pind = 0;// data signal
+}
+//-----------------------------
+void lcd_2wire::LCD_SET_CLK(void) {
+    _pinc = 1;
+}
+//---------------------------------
+void lcd_2wire::LCD_CLR_CLK(void) {
+    _pinc = 0;
+}
+//----------------------------------
+void lcd_2wire::LCD_SET_DATA(void) {
+    _pind = 1;
+}
+//----------------------------------
+void lcd_2wire::LCD_CLR_DATA(void) {
+    _pind = 0;
+}
+//----------------------------------
+int LCD_ROW_TABLE[4] = {  //Display row addresses
+    0x80,
+    0xC0,
+    0x80 + LCD_COLS,
+    0xC0 + LCD_COLS
+};
+//----------------------------------------
+void lcd_2wire::lcd_delay(void) { 
+    wait_us(100);
+}
+//-------------------------------------------
+void lcd_2wire::lcd_init_shift_reg(int mode) {   //Clear shift register, set E and RS
+    int n;
+
+    LCD_CLR_DATA(); //clear data signal
+    lcd_delay();
+
+//clear all outputs of shift register
+    for (n=7; n; n--) {
+        LCD_SET_CLK();
+        lcd_delay();
+        LCD_CLR_CLK();
+    }
+
+//Set high level for E at Q7
+    LCD_SET_DATA();
+    lcd_delay();
+    LCD_SET_CLK();
+    lcd_delay();
+    LCD_CLR_CLK();
+
+//Set level for RS at Q6
+    if (mode == LCD_DATA_MODE) {
+        LCD_SET_DATA();
+    } else {
+        LCD_CLR_DATA();
+    }
+    lcd_delay();
+    LCD_SET_CLK();
+    lcd_delay();
+    LCD_CLR_CLK();
+}
+//----------------------------------------------
+void lcd_2wire::lcd_shift_nibble(int data) { //Clock in 4 bits of data
+    int n, mask= 0x08;
+    for (n =4; n; n--) {   //do this for 4 databits
+        if (data & mask) {  // set or reset data signal
+            LCD_SET_DATA();
+        } else {
+            LCD_CLR_DATA();
+        }
+        LCD_SET_CLK();
+        lcd_delay();
+        LCD_CLR_CLK();
+        mask >>= 1;  // shift right
+    }
+    LCD_SET_CLK();
+    lcd_delay();
+    LCD_CLR_CLK();
+}
+//-------------------------------------------------
+
+void lcd_2wire::lcd_shift_byte(int data , int mode) {
+    lcd_init_shift_reg(mode);
+    lcd_shift_nibble(data >> 4);
+    LCD_SET_DATA();
+    lcd_delay();
+    if (mode != LCD_INIT_MODE) {
+        lcd_init_shift_reg(mode);
+        lcd_shift_nibble(data);
+        LCD_SET_DATA();
+        lcd_delay();
+    }
+    LCD_CLR_DATA();
+    lcd_delay();
+}
+//-------------------------------------------------
+void lcd_2wire::lcd_write_command(int command) {
+    lcd_shift_byte(command,LCD_CMD_MODE);
+}
+//---------------------------------------------------
+void lcd_2wire::lcd_write_data(int data) {
+    lcd_shift_byte(data,LCD_DATA_MODE);
+}
+//----------------------------------------------
+//Functions flags - Bit 0  0: 5x7 Dots   1:5x10 Dots
+//                  Bit 1  0: 1 Row      1: 2 Rows
+//                  Bit 2  0: 4-Bit Intf 1: 8-Bit Intf
+void lcd_2wire::lcd_function_mode(int function_mode) {
+    function_mode =((function_mode & 7) << 2) + 0x20;
+    lcd_write_command(function_mode);
+}
+//-------------------------------------------------
+void lcd_2wire::lcd_display_mode(int display_mode) {
+    display_mode =(display_mode & 7) + 0x08;
+    lcd_write_command(display_mode);
+}
+//-------------------------------------------------
+void lcd_2wire::lcd_entry_mode(int entry_mode) {
+    entry_mode =(entry_mode & 3) + 0x04;
+    lcd_write_command(entry_mode);
+}
+//-------------------------------------------------
+void lcd_2wire::lcd_clear(void) {
+    lcd_write_command(LCD_CLR);
+}
+//--------------------------------------------------
+void lcd_2wire::lcd_home(void) {
+    lcd_write_command(LCD_HOME);
+}
+//--------------------------------------------------
+void lcd_2wire::lcd_goto_xy(int xpos, int ypos) {
+    if (xpos < LCD_COLS && ypos <LCD_ROWS) {
+        lcd_write_command(LCD_ROW_TABLE[ypos] + xpos);
+    }
+}
+//---------------------------------------------------
+void lcd_2wire::lcd_write_char(int chr) {
+    lcd_write_data(chr);
+}
+//--------------------------------------------------
+void lcd_2wire::lcd_write_char_xy(int x, int y, int chr) {
+    lcd_goto_xy(x,y);
+    lcd_write_data(chr);
+}
+//------------------------------------------------
+void lcd_2wire::lcd_write_str(const char *sp) {
+    while (*sp) {
+        lcd_write_data(*sp++);
+    }
+}
+//----------------------------------------------------
+void lcd_2wire::lcd_write_str_xy(int x, int y, const char *sp) {
+    lcd_goto_xy(x,y);
+    lcd_write_data(*sp++);
+}
+//----------------------------------------------------
+void lcd_2wire::lcd_init(void) {
+    LCD_CLR_CLK();
+    LCD_CLR_DATA();
+
+    wait_ms(LCD_POWER_UP_DELAY_MS);
+
+//Startinitialisation
+
+    lcd_shift_byte(LCD_FUNCTION_8BIT_1LINE,LCD_INIT_MODE);
+    wait_ms(LCD_INIT_DELAY_MS);
+    lcd_shift_byte(LCD_FUNCTION_8BIT_1LINE,LCD_INIT_MODE);
+    wait_ms(LCD_INIT_DELAY_MS);
+    lcd_shift_byte(LCD_FUNCTION_8BIT_1LINE,LCD_INIT_MODE);
+    wait_ms(LCD_INIT_DELAY_MS);
+    lcd_shift_byte(LCD_FUNCTION_4BIT_1LINE,LCD_INIT_MODE);
+    wait_ms(LCD_INIT_DELAY_MS);
+//Display is in 4 bit I/O mode now
+#if (LCD_ROWS > 1)
+    lcd_write_command(LCD_FUNCTION_4BIT_2LINE);
+#else
+    lcd_write_command(LCD_FUNCTION_4BIT_1LINE);
+#endif
+    wait_ms(LCD_INIT_DELAY_MS);
+    lcd_write_command(LCD_DISP_ON);
+    wait_ms(LCD_INIT_DELAY_MS);
+    lcd_write_command(LCD_CLR);
+    lcd_write_command(LCD_HOME);
+    wait_ms(LCD_INIT_DELAY_MS);
+}
+