1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 /*
18 * This is an example to display text on the Grove
19 * LCD RGB Display panel.
20 */
21
22 #include <jhd1313m1.h>
23 #include <mraa.hpp>
24
25 #include <getopt.h>
26 #include <stdio.h>
27 #include <sys/types.h>
28 #include <unistd.h>
29 #include <string>
30
31 #define DEFAULT_COLOR_RED 255
32 #define DEFAULT_COLOR_GREEN 255
33 #define DEFAULT_COLOR_BLUE 255
34 #define DEFAULT_DISPLAY_TEXT "hello world"
35
36 // Structure to hold the decoded command line options
37 struct pgm_options {
38 uint8_t red, blue, green;
39 std::string display_text;
40 };
41
42 // Be sure to keep the options for longopts and shortopts in the same order
43 // so that Usage() is correct.
44 static struct option longopts[] = {
45 {"help", no_argument, NULL, '?'},
46 {"text", required_argument, NULL, 't'},
47 {"red", no_argument, NULL, 'r'},
48 {"green", no_argument, NULL, 'g'},
49 {"blue", no_argument, NULL, 'b'},
50 {NULL, 0, NULL, 0 }
51 };
52 static char shortopts[] = "?t:rgb";
53
54 // Describes the options for this program.
Usage(char * pgm_name)55 void Usage(char *pgm_name) {
56 printf("Usage: %s [options...]\n", pgm_name);
57 printf("Prints a message on the Grove LCD RGB Display\n");
58 printf("Options:\n");
59 for (int i = 0, j = 0; longopts[i].name; i++, j++) {
60 if (shortopts[j] == ':')
61 j++;
62 printf(" --%-6s or -%c\n", longopts[i].name, shortopts[j]);
63 }
64 return;
65 }
66
67 // Processes all command line options.
68 // sets the options members for commnd line options
69 // returns (0) on success, -1 otherwise.
ReadOpts(int argc,char ** argv,struct pgm_options * options)70 int ReadOpts(int argc, char **argv, struct pgm_options *options) {
71 int ch = 0;
72 bool color_specified = false;
73
74 while ((ch = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1) {
75 switch (ch) {
76 case 'r':
77 options->red = 255;
78 color_specified = true;
79 break;
80 case 'g':
81 options->green = 255;
82 color_specified = true;
83 break;
84 case 'b':
85 options->blue = 255;
86 color_specified = true;
87 break;
88 case 't':
89 options->display_text = optarg;
90 break;
91 default:
92 Usage(argv[0]);
93 return -1;
94 }
95 }
96 argc -= optind;
97 argv += optind;
98
99 if (!color_specified) {
100 options->red = DEFAULT_COLOR_RED;
101 options->green = DEFAULT_COLOR_GREEN;
102 options->blue = DEFAULT_COLOR_BLUE;
103 }
104 if (options->display_text.length() == 0)
105 options->display_text = DEFAULT_DISPLAY_TEXT;
106
107 return 0;
108 }
109
main(int argc,char * argv[])110 int main(int argc, char* argv[]) {
111 pgm_options options = {0, 0, 0, ""};
112
113 if (ReadOpts(argc, argv, &options) < 0)
114 return 1;
115
116 upm::Jhd1313m1 display(mraa_get_default_i2c_bus(MRAA_MAIN_PLATFORM_OFFSET));
117 display.write(options.display_text.c_str());
118 display.setColor(options.red, options.green, options.blue);
119 sleep(5);
120
121 display.displayOff();
122 return 0;
123 }
124