DigitalInOut Hello World
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Use
The DigitalInOut API can be used to both read and write a digital pin. Use the output() and input() function calls to switch modes and then use just like you would DigitalIn or DigitalOut.
API
API reference.
Import librarymbed
main.cpp@5:65ab82bfa4a6, 2015-03-27 (annotated)
- Committer:
- mbedAustin
- Date:
- Fri Mar 27 22:05:54 2015 +0000
- Revision:
- 5:65ab82bfa4a6
- Parent:
- 4:3f69262115b3
it works!!!;
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbedAustin | 4:3f69262115b3 | 1 | /* mbed Example Program |
mbedAustin | 4:3f69262115b3 | 2 | * Copyright (c) 2006-2014 ARM Limited |
mbedAustin | 4:3f69262115b3 | 3 | * |
mbedAustin | 4:3f69262115b3 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
mbedAustin | 4:3f69262115b3 | 5 | * you may not use this file except in compliance with the License. |
mbedAustin | 4:3f69262115b3 | 6 | * You may obtain a copy of the License at |
mbedAustin | 4:3f69262115b3 | 7 | * |
mbedAustin | 4:3f69262115b3 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
mbedAustin | 4:3f69262115b3 | 9 | * |
mbedAustin | 4:3f69262115b3 | 10 | * Unless required by applicable law or agreed to in writing, software |
mbedAustin | 4:3f69262115b3 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
mbedAustin | 4:3f69262115b3 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
mbedAustin | 4:3f69262115b3 | 13 | * See the License for the specific language governing permissions and |
mbedAustin | 4:3f69262115b3 | 14 | * limitations under the License. |
mbedAustin | 4:3f69262115b3 | 15 | */ |
mbed_official | 0:0d0417932681 | 16 | #include "mbed.h" |
mbedAustin | 5:65ab82bfa4a6 | 17 | |
mbedAustin | 5:65ab82bfa4a6 | 18 | DigitalInOut mypin(LED1); |
mbedAustin | 5:65ab82bfa4a6 | 19 | |
mbedAustin | 5:65ab82bfa4a6 | 20 | int main() |
mbedAustin | 5:65ab82bfa4a6 | 21 | { |
mbedAustin | 5:65ab82bfa4a6 | 22 | // check that mypin object is initialized and connected to a pin |
mbedAustin | 5:65ab82bfa4a6 | 23 | if(mypin.is_connected()) { |
mbedAustin | 5:65ab82bfa4a6 | 24 | printf("mypin is initialized and connected!\n\r"); |
mbedAustin | 5:65ab82bfa4a6 | 25 | } |
mbedAustin | 5:65ab82bfa4a6 | 26 | |
mbedAustin | 5:65ab82bfa4a6 | 27 | // Optional: set mode as PullUp/PullDown/PullNone/OpenDrain |
mbedAustin | 5:65ab82bfa4a6 | 28 | mypin.mode(PullNone); |
mbedAustin | 5:65ab82bfa4a6 | 29 | |
mbedAustin | 5:65ab82bfa4a6 | 30 | while(1) { |
mbedAustin | 5:65ab82bfa4a6 | 31 | // write to pin as output |
mbedAustin | 5:65ab82bfa4a6 | 32 | mypin.output(); |
mbedAustin | 5:65ab82bfa4a6 | 33 | mypin = !mypin; // toggle output |
mbedAustin | 5:65ab82bfa4a6 | 34 | wait(0.5); |
mbedAustin | 5:65ab82bfa4a6 | 35 | |
mbedAustin | 5:65ab82bfa4a6 | 36 | // read from pin as input |
mbedAustin | 5:65ab82bfa4a6 | 37 | mypin.input(); |
mbedAustin | 5:65ab82bfa4a6 | 38 | printf("mypin.read() = %d \n\r",mypin.read()); |
mbedAustin | 5:65ab82bfa4a6 | 39 | wait(0.5); |
mbedAustin | 5:65ab82bfa4a6 | 40 | } |
mbed_official | 0:0d0417932681 | 41 | } |