148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/*
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* fbdash.c
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*
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* Adapted by Florian Klemenz for use in the fb_dash project
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*
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* Credit for most of the framebuffer-related source code goes to
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* http://raspberrycompote.blogspot.com/
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* Thanks for providing an excellent tutorial!
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* --------------------------------------------------------------------------------------------
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*
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* http://raspberrycompote.blogspot.ie/2014/03/low-level-graphics-on-raspberry-pi-part_14.html
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*
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* Original work by J-P Rosti (a.k.a -rst- and 'Raspberry Compote')
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*
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* Licensed under the Creative Commons Attribution 3.0 Unported License
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* (http://creativecommons.org/licenses/by/3.0/deed.en_US)
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*
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* Distributed in the hope that this will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <float.h>
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#include "fblib.h"
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#include "fbdata.h"
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#define DEVICE "/dev/fb1"
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#define WIDTH 240
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#define HEIGHT 320
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#define BITS_PER_PIXEL 16
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void updateSlot(screen fb, sourcedata data, int x_offset, int y_offset, color c) {
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render_string(fb, ubuntu_mono_24, data.text, x_offset, y_offset, c.r, c.g, c.b);
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if (data.temperature) render_string(fb, ubuntu_mono_48, data.temperature, x_offset + 115, y_offset - 9, c.r, c.g, c.b);
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render_string(fb, ubuntu_mono_48, "C", x_offset + 195, y_offset - 9, c.r, c.g, c.b);
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if (data.humidity) render_string(fb, ubuntu_mono_48, data.humidity, x_offset + 115, y_offset + 26, c.r, c.g, c.b);
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render_string(fb, ubuntu_mono_48, "%", x_offset + 195, y_offset + 26, c.r, c.g, c.b);
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}
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void draw(screen fb) {
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clear_screen(fb);
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int slot_height = fb.height / 4;
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// horizontal spacersint x_space = 10;
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for (int i = 1; i < 4; i++) {
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int x0 = 15;
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int x1 = fb.width - x0;
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int y = slot_height * i;
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int r = 225;
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int g = 32;
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int b = 32;
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draw_line(fb, x0, y-1, x1, y-1, r, g, b);
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draw_line(fb, x0, y , x1, y , r, g, b);
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draw_line(fb, x0, y+1, x1, y+1, r, g, b);
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}
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// define what to display
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sourcedata data[4] = {
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// text | temperature | humidity
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{ "Esszimmer" , NULL, NULL },
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{ "Wohnzimmer" , NULL, NULL },
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{ "Schlafzimmer" , NULL, NULL },
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{ "Abstellkammer" , NULL, NULL }
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};
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// fetch data from database and update screen
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printf("Fetching data...\n");
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updateData(data);
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// update dashboard
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printf("Updating dashboard...\n");
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for (int i = 0; i < 4; i++) {
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color c = {255,125 + 25*i,25 + 25*i};
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updateSlot(fb, data[i], 15, 7 + slot_height * i, c);
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// release allocated memory for values
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free(data[i].temperature);
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free(data[i].humidity);
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}
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}
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// application entry point
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int main(int argc, char* argv[]) {
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char *fbp = 0;
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int fbfd = 0;
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long int screensize = 0;
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// Open the framebuffer file for reading and writing
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fbfd = open(DEVICE, O_RDWR);
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if (fbfd == -1) {
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printf("Error: cannot open framebuffer device.\n");
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return(1);
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}
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printf("The framebuffer device was opened successfully.\n");
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// map fb to user mem
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screensize = WIDTH * HEIGHT * (BITS_PER_PIXEL / 8);
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fbp = (char*)mmap(0,
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screensize,
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PROT_READ | PROT_WRITE,
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MAP_SHARED,
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fbfd,
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0);
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if ((int)fbp == -1) {
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printf("Failed to mmap.\n");
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}
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else {
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// define the screen object
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screen fb = {
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.buffer = fbp,
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.width = WIDTH,
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.height = HEIGHT,
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.bpp = BITS_PER_PIXEL,
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.step = (BITS_PER_PIXEL / 8),
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.line = (BITS_PER_PIXEL / 8) * WIDTH,
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.screensize = screensize,
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};
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// draw...
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draw(fb);
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}
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// cleanup
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//clear_screen(fbp);
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munmap(fbp, screensize);
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close(fbfd);
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return 0;
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}
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