main.cpp

00001 /* mbed Example Program
00002  * Copyright (c) 2006-2015 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include "mbed.h"
00018 
00019 // Initialize a pins to perform analog and digital output fucntions
00020 AnalogOut  aout(p18);
00021 DigitalOut dout(LED1);
00022 
00023 int main(void)
00024 {
00025     while (1) {
00026         // change the voltage on the digital output pin by 0.1 * VCC
00027         //  and print what the measured voltage should be (assuming VCC = 3.3v)
00028         for (float i = 0.0f; i < 1.0f; i += 0.1f) {
00029             aout = i;
00030             printf("aout = %1.2f volts\n", aout.read() * 3.3f);
00031             // turn on the led if the voltage is greater than 0.5f * VCC
00032             dout = (aout > 0.5f) ? 1 : 0;
00033             wait(1.0f);
00034         }
00035     }
00036 }