142 lines
3.3 KiB
C
142 lines
3.3 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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* Source and all credit goes to
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* http://raspberrycompote.blogspot.com/
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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 <mysql.h>
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#include "fblib.h"
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#define WIDTH 240
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#define HEIGHT 320
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char *fbp = 0;
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void draw() {
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clear_screen(fbp);
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// horizontal spacersint x_space = 10;
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int y_step_width = HEIGHT / 4;
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for (int i = 1; i < 4; i++) {
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int x0 = 15;
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int x1 = WIDTH - x0;
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int y = y_step_width * 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(fbp, x0, y-1, x1, y-1, r, g, b);
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draw_line(fbp, x0, y , x1, y , r, g, b);
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draw_line(fbp, x0, y+1, x1, y+1, r, g, b);
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}
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/*
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char *text = "Hell O_o!";
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render_string(fbp, ubuntu_mono_48, text, 15, 0, 255, 255, 255);
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render_string(fbp, ubuntu_mono_24, text, 15, 50, 255, 255, 255);
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render_string(fbp, basic_8, text, 15, 100, 255, 255, 255);
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*/
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}
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void finish_with_error(MYSQL *con)
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{
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fprintf(stderr, "%s\n", mysql_error(con));
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mysql_close(con);
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exit(1);
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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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{
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printf("MySQL client version: %s\n", mysql_get_client_info());
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MYSQL *con = mysql_init(NULL);
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if (con == NULL) {
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fprintf(stderr, "%s\n", mysql_error(con));
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exit(1);
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}
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if (mysql_real_connect(con, "web-pi", "root", "root_passwd", NULL, 0, NULL, 0) == NULL) {
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fprintf(stderr, "%s\n", mysql_error(con));
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mysql_close(con);
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exit(1);
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}
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if (mysql_query(con, "SELECT * FROM grafanaData.readings ORDER BY time DESC LIMIT 1")) {
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finish_with_error(con);
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}
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MYSQL_RES *result = mysql_store_result(con);
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if (result == NULL) {
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finish_with_error(con);
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}
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int num_fields = mysql_num_fields(result);
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MYSQL_ROW row;
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while ((row = mysql_fetch_row(result))) {
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for(int i = 0; i < num_fields; i++) {
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printf("%s ", row[i] ? row[i] : "NULL");
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}
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printf("\n");
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}
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mysql_free_result(result);
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mysql_close(con);
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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("/dev/fb1", 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*2;
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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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// draw...
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draw();
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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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