136 lines
2.5 KiB
C
136 lines
2.5 KiB
C
/*
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* lcd_emulator.c
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*
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* Created on: Apr 1, 2019
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <ctype.h>
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#include "lcd.h"
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#define CR 13 // \r
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#define TAB 9 // \n
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static uint8_t lcd_row, lcd_col;
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static char lcd_buf[MAX_ROWS][MAX_CHARS_PER_LINE];
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const char* get_lcd_buf(void){
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return &lcd_buf[0][0];
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}
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void print_lcd(void){
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printf("(row,col)=(%d,%d)\n", lcd_row, lcd_col);
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printf("|---|---|---|---|\n");
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for (int i = 0; i < MAX_ROWS; i++){
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printf("|");
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for (int j = 0; j < MAX_CHARS_PER_LINE; j++){
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printf("%c", lcd_buf[i][j]);
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}
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printf("\n");
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}
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printf("|---|---|---|---|\n");
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}
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void LCD_Open(void){
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LCD_Clear();
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}
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void LCD_Clear(void){
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for (int i = 0; i < MAX_ROWS; i++){
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for (int j = 0; j < MAX_CHARS_PER_LINE; j++){
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lcd_buf[i][j] = ' ';
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}
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}
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lcd_row=0;
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lcd_col=0;
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}
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void LCD_GoTo(uint8_t row, uint8_t col){
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if (row < MAX_ROWS && col < MAX_CHARS_PER_LINE){
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lcd_row = row;
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lcd_col = col;
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} else {
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printf("LCD_GoTo(%u, %u) out of range\n", lcd_row, lcd_col);
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}
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}
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static void to_row(unsigned char row_to){
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if (row_to == 0){
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lcd_row = 0;
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} else {
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lcd_row = 1;
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}
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lcd_col = 0;
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}
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void LCD_OutString(const char *string, uint8_t max_chars) {
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const char *s;
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for (s = string; *s && max_chars > 0; s++, max_chars--) {
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TERMIO_PutChar(*s);
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}
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}
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static int is_valid_character(char letter){
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if (isdigit(letter)){
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return 1;
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} else if(letter == CGRAM_EXP || letter == CGRAM_EXP_NEG){
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return 1;
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} else if(letter == '.' || letter == ' ' || letter == '-'){
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return 1;
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}
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return 0;
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}
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short TERMIO_PutChar(unsigned char letter) {
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if (letter == CR || letter == '\n') {
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LCD_Clear();
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} else if (letter == TAB || letter == '\t') {
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if (lcd_row == 0) {
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to_row(1);
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} else {
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to_row(0);
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}
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}
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//warn if unknown character
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if (!is_valid_character(letter)) {
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printf("\nerror @%d,%d, invalid character %d\n",
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lcd_row, lcd_col, letter);
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}
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//add character to buf
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if (letter == CGRAM_EXP){
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lcd_buf[lcd_row][lcd_col] = 'E';
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} else if (letter == CGRAM_EXP_NEG) {
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lcd_buf[lcd_row][lcd_col] = '-';
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} else {
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lcd_buf[lcd_row][lcd_col] = letter;
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}
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lcd_col++;
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//check if new line
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if (lcd_col >= MAX_CHARS_PER_LINE) {
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if (lcd_row == 0) {
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to_row(1);
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} else {
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to_row(0);
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}
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}
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return 1;
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}
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void LCD_ClearToEnd(uint8_t curr_row){
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while (lcd_col != 0 && lcd_row == curr_row){
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TERMIO_PutChar(' ');
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}
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}
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void LCD_OutNibble(uint8_t x){
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x &= 0xf; //ensure only bottom nibble
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if (x <= 9){
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TERMIO_PutChar(x + '0');
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} else {
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TERMIO_PutChar(x - 10 + 'a');
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}
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}
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