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#include "i2c.h"
#include "lcd.h"
#include <glib.h>
#include <string.h>
#include <stdlib.h>
#define LCD_ENABLE 0x03 /* the 4x40 LCDs have two enable lines - 0x03 enables both at the same time */
#define LCD_DATA_RAM 128 /* display RAM, in the LCD ICs */
#define LCD_CG_RAM 64 /* custom character RAM, in the LCD ICs */
#define LCD_chars_total 160
#define LCD_cols 40
#define LCD_rows 4 /* 4x40 LCD */
char LCD_Data[LCD_rows][LCD_cols]; /* shadow copy of LCD display in local RAM, to minimize slow I2C writes */
/*** EndHeader */
static void break_up_string (char *in_string, int N, char **str1, char **str2, char **str3)
{
#define SUBSTRING_CNT 3
int input_length;
int j, k, copypos;
int n;
char *copy_input;
char *p;
j=k=copypos=0;
input_length=strlen(in_string);
copy_input = g_strdup(in_string);
for (j=0; j<SUBSTRING_CNT; j++) {
gchar *interm_str = g_strnfill (N, 0);
for (k=0; k<N; k++) {
copypos++; // next symbol
if (copypos>input_length) {
break;
}
if ((*(copy_input+k)==' ')&&(copypos<input_length)) { // space found
//find next space
p=strchr(copy_input+k+1,' ');
if (p!=NULL) {
// next space is beyond N char limit for one line
if((p-copy_input)/sizeof(char)>=N) {
break;
}
} else {
// No more spaces. Does the last chunk of text fit?
if (strlen(copy_input+k+1)>N-k) {
break;
}
}
}
// valid character, copy to output string
*(interm_str+k)=*(copy_input+k);
}
// remove processed part from the input
if (copypos<=input_length) {
strcpy(copy_input, in_string+copypos);
}
n = strlen(interm_str);
for (k=n-1; k=0; k--) { //trim space
if (*(interm_str+k)==' ') {
*(interm_str+k)=0;
} else {
break;
}
}
switch (j) {
case 0:
*str1 = g_strdup(interm_str);
break;
case 1:
*str2 = g_strdup(interm_str);
break;
case 2:
*str3 = g_strdup(interm_str);
break;
}
g_free(interm_str);
}
g_free(copy_input);
}
void LCD_clear()
{
char i;
char j;
I2C_Write(PCF8574A+LCD_Port, 0x00 | LCD_ENABLE);
I2C_Write(PCF8574A+LCD_Port, 0x00);
I2C_Write(PCF8574A+LCD_Port, 0x10 | LCD_ENABLE);
I2C_Write(PCF8574A+LCD_Port, 0x10);
/* wait 1.64ms */
g_usleep(1640);
for (i=0; i<4; ++i)
for (j=0; j<40; ++j) {
LCD_Data[i][j]=0;
}
return;
}
static void LCD_RAM_write(int RAM_start,int row, int col, char *LCD_string)
{
/* rows: 0-3, cols: 0-39 */
#define data_level 0x04
int i;
int cur_row, cur_col;
int String_length;
char char_out, enable_one_lcd;
int ram_location;
char last_op_a_write;
if (!LCD_string) return;
String_length=strlen(LCD_string);
enable_one_lcd=0x02;
last_op_a_write=0;
cur_row=row;
cur_col=col;
if (cur_row<2) {
enable_one_lcd=0x02;
} else {
enable_one_lcd=0x01;
}
/* write out the string */
for (i=0; i<String_length; ++i) {
if (cur_row<2) {
enable_one_lcd=0x02;
} else {
enable_one_lcd=0x01;
}
if (LCD_string[i]!=LCD_Data[cur_row][cur_col]) {
if (!last_op_a_write) {
/* move to new position */
ram_location = (cur_row & 1) * 64 + cur_col + RAM_start;
char_out=ram_location & 0xf0;
I2C_Write(PCF8574A+LCD_Port, char_out | enable_one_lcd);
I2C_Write(PCF8574A+LCD_Port, char_out);
char_out=ram_location << 4;
I2C_Write(PCF8574A+LCD_Port, char_out | enable_one_lcd);
I2C_Write(PCF8574A+LCD_Port, char_out);
}
LCD_Data[cur_row][cur_col]=LCD_string[i];
char_out=LCD_string[i] & 0xf0;
I2C_Write(PCF8574A+LCD_Port, char_out | enable_one_lcd | data_level);
I2C_Write(PCF8574A+LCD_Port, char_out | data_level);
char_out=LCD_string[i] << 4;
I2C_Write(PCF8574A+LCD_Port, char_out | enable_one_lcd | data_level);
I2C_Write(PCF8574A+LCD_Port, char_out | data_level);
last_op_a_write=1;
} else {
last_op_a_write=0;
}
++cur_col;
if (cur_col==40) {
cur_col=0;
++cur_row;
}
}
return;
}
void LCD_write(int row, int col, char *LCD_string)
{
LCD_RAM_write(LCD_DATA_RAM, row, col, LCD_string);
return;
}
static void LCD_make_custom_chars()
{
/* define custom LCD characters 2 and 3 (up arrow and down arrow).*/
/* The up arrow is stored in one LCD controller (for rows 0 and 1) */
/* The down arrow is stored in the other LCD controller (for rows 2 and 3) */
LCD_RAM_write(LCD_CG_RAM,0,16,"\x4");
LCD_RAM_write(LCD_CG_RAM,0,17,"\xe");
LCD_RAM_write(LCD_CG_RAM,0,18,"\x15");
LCD_RAM_write(LCD_CG_RAM,0,19,"\x4");
LCD_RAM_write(LCD_CG_RAM,0,20,"\x4");
LCD_RAM_write(LCD_CG_RAM,0,21,"\x4");
LCD_RAM_write(LCD_CG_RAM,0,22,"\x4");
LCD_RAM_write(LCD_CG_RAM,0,23,"\x4");
LCD_RAM_write(LCD_CG_RAM,2,24,"\x4");
LCD_RAM_write(LCD_CG_RAM,2,25,"\x4");
LCD_RAM_write(LCD_CG_RAM,2,26,"\x4");
LCD_RAM_write(LCD_CG_RAM,2,27,"\x4");
LCD_RAM_write(LCD_CG_RAM,2,28,"\x4");
LCD_RAM_write(LCD_CG_RAM,2,29,"\x15");
LCD_RAM_write(LCD_CG_RAM,2,30,"\xe");
LCD_RAM_write(LCD_CG_RAM,2,31,"\x4");
// prove that it works - debug only
// LCD_RAM_write(LCD_DATA_RAM,0,39,"\x2");
// LCD_RAM_write(LCD_DATA_RAM,3,39,"\x3");
return;
}
void LCD_initialize(void)
{
/* Wait 15ms */
g_usleep(15000);
I2C_Write(PCF8574A+LCD_Port, 0x30 | LCD_ENABLE);
I2C_Write(PCF8574A+LCD_Port, 0x30);
/* wait 4.1ms */
g_usleep(4100);
I2C_Write(PCF8574A+LCD_Port, 0x30 | LCD_ENABLE);
I2C_Write(PCF8574A+LCD_Port, 0x30);
/* wait 100us */
g_usleep(100);
I2C_Write(PCF8574A+LCD_Port, 0x30 | LCD_ENABLE);
I2C_Write(PCF8574A+LCD_Port, 0x30);
/* wait 4.1ms */
g_usleep(4100);
I2C_Write(PCF8574A+LCD_Port, 0x20 | LCD_ENABLE);
I2C_Write(PCF8574A+LCD_Port, 0x20);
/*wait 40us */
g_usleep(40);
I2C_Write(PCF8574A+LCD_Port, 0x20 | LCD_ENABLE);
I2C_Write(PCF8574A+LCD_Port, 0x20);
I2C_Write(PCF8574A+LCD_Port, 0x80 | LCD_ENABLE);
I2C_Write(PCF8574A+LCD_Port, 0x80);
/* wait 40us */
g_usleep(40);
LCD_clear();
I2C_Write(PCF8574A+LCD_Port, 0x00 | LCD_ENABLE);
I2C_Write(PCF8574A+LCD_Port, 0x00);
I2C_Write(PCF8574A+LCD_Port, 0x60 | LCD_ENABLE);
I2C_Write(PCF8574A+LCD_Port, 0x60);
/* wait 40us */
g_usleep(40);
I2C_Write(PCF8574A+LCD_Port, 0x00 | LCD_ENABLE);
I2C_Write(PCF8574A+LCD_Port, 0x00);
I2C_Write(PCF8574A+LCD_Port, 0xc0 | LCD_ENABLE);
I2C_Write(PCF8574A+LCD_Port, 0xc0);
LCD_make_custom_chars();
return;
}
void LCD_display_error_message(char *response)
{
char *row0 = NULL;
char *row1 = NULL;
char *row2 = NULL;
// Error_Screen=1; //FIXME
break_up_string (response, LCD_cols, &row0, &row1, &row2);
LCD_clear();
LCD_write(0,0,row0);
LCD_write(1,0,row1);
LCD_write(2,0,row2);
LCD_write(3,0,Press_Change_Message);
g_free (row0);
g_free (row1);
g_free (row2);
return;
}
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