Sun, 08 Nov 2015 17:49:29 +0100
Basic ideas to write to the simulated LCD display are in place.
/***************************************************************************** * Copyright (C) 2014 * * Michiel Broek <mbroek at mbse dot eu> * * This file is part of the mbsePi-apps * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2, or (at your option) any * later version. * * mbsePi-apps is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with mbsePi-apps; see the file COPYING. If not, write to the Free * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. *****************************************************************************/ #include "thermferm.h" #include "lcd-buffer.h" #include "lcd-pcf8574.h" #include "panel.h" #ifdef HAVE_WIRINGPI_H int current_lines = 0; int current_offset = 0; lcd_rows *my_lcd_rows = NULL; extern int lcdHandle; extern sys_config Config; /* * Reset the LCD screens chain, it will automatic rebuild. */ void lcd_buf_reset(void) { lcd_rows *tmp, *old; for (tmp = my_lcd_rows; tmp; tmp = old) { old = tmp->next; tmp->next = NULL; free(tmp); } current_lines = current_offset = 0; my_lcd_rows = NULL; } /* * Write to buffer array. Allocate more lines if needed. */ void lcd_buf_write(int row, const char *format, ...) { char buf[81 * sizeof(char)]; va_list va_ptr; lcd_rows *tmp, *newrow; int i = 0; va_start(va_ptr, format); vsnprintf(buf, (Config.lcd_cols + 1) * sizeof(char), format, va_ptr); va_end(va_ptr); /* * Check if the line in row is allocated. If not, do it * and make sure the chain is valid. */ while (row > current_lines) { syslog(LOG_NOTICE, "lcd_buf_write(%d, ...) allocate new row", row); newrow = (lcd_rows *)malloc(sizeof(lcd_rows)); newrow->next = NULL; snprintf(newrow->row, (Config.lcd_cols + 1) * sizeof(char), " "); if (my_lcd_rows == NULL) { my_lcd_rows = newrow; } else { for (tmp = my_lcd_rows; tmp; tmp = tmp->next) { if (tmp->next == NULL) { tmp->next = newrow; current_lines++; break; } } } } /* * Now update the text */ for (tmp = my_lcd_rows; tmp; tmp = tmp->next) { i++; if (i == row) { snprintf(tmp->row, Config.lcd_cols + 1, "%s", buf); return; } } syslog(LOG_NOTICE, "lcd_buf_write(%d, ...) could not find row, i=%d", row, i); } void lcd_buf_step(int key) { if (key == KEY_DOWN) { if (current_offset < (current_lines - Config.lcd_rows)) current_offset += Config.lcd_rows; else current_offset = 0; syslog(LOG_NOTICE, "lcd_buf_step(KEY_DOWN) current_lines=%d current_offset=%d", current_lines, current_offset); lcd_buf_show(); } if (key == KEY_UP) { if (current_offset >= Config.lcd_rows) current_offset -= Config.lcd_rows; else current_offset = (current_lines - Config.lcd_rows); syslog(LOG_NOTICE, "lcd_buf_step(KEY_UP) current_lines=%d current_offset=%d", current_lines, current_offset); lcd_buf_show(); } } /* * This will be called from the main thread every second. */ void lcd_buf_show(void) { int i = 0, r = 0; lcd_rows *tmp; for (tmp = my_lcd_rows; tmp; tmp = tmp->next) { if (i == current_offset) break; i++; } if (tmp == NULL) { syslog(LOG_NOTICE, "lcd_buf_show: search after last record, current_offset=%d current_lines=%d i=%d", current_offset, current_lines, i); return; } lcdPosition(lcdHandle, 0, r); lcdPuts(lcdHandle, tmp->row); r++; if (r < Config.lcd_rows) { if (tmp->next != NULL) tmp = tmp->next; else tmp = my_lcd_rows; lcdPosition(lcdHandle, 0, r); lcdPuts(lcdHandle, tmp->row); } } #endif