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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* This is an example to display text on the SparkFun OLED
* Display panel.
*/
#include <eboled.h>
#include <mraa.hpp>
#include <getopt.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <string>
#define DEFAULT_DISPLAY_TEXT "hello world"
// Structure to hold the decoded command line options
struct pgm_options {
uint8_t invert_color;
std::string display_text;
};
// Be sure to keep the options for longopts and shortopts in the same order
// so that Usage() is correct.
static struct option longopts[] = {
{"help", no_argument, NULL, '?'},
{"text", required_argument, NULL, 't'},
{"invert",no_argument, NULL, 'i'},
{NULL, 0, NULL, 0 }
};
static char shortopts[] = "?t:i";
// Describes the options for this program.
void Usage(char *pgm_name) {
printf("Usage: %s [options...]\n", pgm_name);
printf("Prints a message on the SparkFun OLED Display\n");
printf("Options:\n");
for (int i = 0, j = 0; longopts[i].name; i++, j++) {
if (shortopts[j] == ':')
j++;
printf(" --%-6s or -%c\n", longopts[i].name, shortopts[j]);
}
return;
}
// Processes all command line options.
// sets the options members for commnd line options
// returns (0) on success, -1 otherwise.
int ReadOpts(int argc, char **argv, struct pgm_options *options) {
int ch = 0;
while ((ch = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1) {
switch (ch) {
case 'i':
options->invert_color = true;
break;
case 't':
options->display_text = optarg;
break;
default:
Usage(argv[0]);
return -1;
}
}
argc -= optind;
argv += optind;
if (options->display_text.length() == 0)
options->display_text = DEFAULT_DISPLAY_TEXT;
return 0;
}
int main(int argc, char* argv[]) {
pgm_options options = {false, ""};
if (ReadOpts(argc, argv, &options) < 0)
return 1;
upm::EBOLED *display = new upm::EBOLED(
mraa_get_default_i2c_bus(MRAA_MAIN_PLATFORM_OFFSET),
EBOLED_DEFAULT_CD, EBOLED_DEFAULT_RESET);
if (options.invert_color) {
display->setTextColor(upm::COLOR_BLACK);
display->fillScreen(upm::COLOR_WHITE);
}
display->write(options.display_text);
display->refresh();
sleep(5);
delete display;
return 0;
}
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