Jhon Plantikow / DHT11

DHT11

AnalogOut.h@0:c52df770855b, 2015-08-13 (annotated)

Committer:
jhon309
Date:
Thu Aug 13 00:21:57 2015 +0000
Revision:
0:c52df770855b
DHT11

Who changed what in which revision?

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jhon309 0:c52df770855b 1 /* mbed Microcontroller Library
jhon309 0:c52df770855b 2 * Copyright (c) 2006-2013 ARM Limited
jhon309 0:c52df770855b 3 *
jhon309 0:c52df770855b 4 * Licensed under the Apache License, Version 2.0 (the "License");
jhon309 0:c52df770855b 5 * you may not use this file except in compliance with the License.
jhon309 0:c52df770855b 6 * You may obtain a copy of the License at
jhon309 0:c52df770855b 7 *
jhon309 0:c52df770855b 8 * http://www.apache.org/licenses/LICENSE-2.0
jhon309 0:c52df770855b 9 *
jhon309 0:c52df770855b 10 * Unless required by applicable law or agreed to in writing, software
jhon309 0:c52df770855b 11 * distributed under the License is distributed on an "AS IS" BASIS,
jhon309 0:c52df770855b 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
jhon309 0:c52df770855b 13 * See the License for the specific language governing permissions and
jhon309 0:c52df770855b 14 * limitations under the License.
jhon309 0:c52df770855b 15 */
jhon309 0:c52df770855b 16 #ifndef MBED_ANALOGOUT_H
jhon309 0:c52df770855b 17 #define MBED_ANALOGOUT_H
jhon309 0:c52df770855b 18
jhon309 0:c52df770855b 19 #include "platform.h"
jhon309 0:c52df770855b 20
jhon309 0:c52df770855b 21 #if DEVICE_ANALOGOUT
jhon309 0:c52df770855b 22
jhon309 0:c52df770855b 23 #include "analogout_api.h"
jhon309 0:c52df770855b 24
jhon309 0:c52df770855b 25 namespace mbed {
jhon309 0:c52df770855b 26
jhon309 0:c52df770855b 27 /** An analog output, used for setting the voltage on a pin
jhon309 0:c52df770855b 28 *
jhon309 0:c52df770855b 29 * Example:
jhon309 0:c52df770855b 30 * @code
jhon309 0:c52df770855b 31 * // Make a sawtooth output
jhon309 0:c52df770855b 32 *
jhon309 0:c52df770855b 33 * #include "mbed.h"
jhon309 0:c52df770855b 34 *
jhon309 0:c52df770855b 35 * AnalogOut tri(p18);
jhon309 0:c52df770855b 36 * int main() {
jhon309 0:c52df770855b 37 * while(1) {
jhon309 0:c52df770855b 38 * tri = tri + 0.01;
jhon309 0:c52df770855b 39 * wait_us(1);
jhon309 0:c52df770855b 40 * if(tri == 1) {
jhon309 0:c52df770855b 41 * tri = 0;
jhon309 0:c52df770855b 42 * }
jhon309 0:c52df770855b 43 * }
jhon309 0:c52df770855b 44 * }
jhon309 0:c52df770855b 45 * @endcode
jhon309 0:c52df770855b 46 */
jhon309 0:c52df770855b 47 class AnalogOut {
jhon309 0:c52df770855b 48
jhon309 0:c52df770855b 49 public:
jhon309 0:c52df770855b 50
jhon309 0:c52df770855b 51 /** Create an AnalogOut connected to the specified pin
jhon309 0:c52df770855b 52 *
jhon309 0:c52df770855b 53 * @param AnalogOut pin to connect to (18)
jhon309 0:c52df770855b 54 */
jhon309 0:c52df770855b 55 AnalogOut(PinName pin) {
jhon309 0:c52df770855b 56 analogout_init(&_dac, pin);
jhon309 0:c52df770855b 57 }
jhon309 0:c52df770855b 58
jhon309 0:c52df770855b 59 /** Set the output voltage, specified as a percentage (float)
jhon309 0:c52df770855b 60 *
jhon309 0:c52df770855b 61 * @param value A floating-point value representing the output voltage,
jhon309 0:c52df770855b 62 * specified as a percentage. The value should lie between
jhon309 0:c52df770855b 63 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
jhon309 0:c52df770855b 64 * Values outside this range will be saturated to 0.0f or 1.0f.
jhon309 0:c52df770855b 65 */
jhon309 0:c52df770855b 66 void write(float value) {
jhon309 0:c52df770855b 67 analogout_write(&_dac, value);
jhon309 0:c52df770855b 68 }
jhon309 0:c52df770855b 69
jhon309 0:c52df770855b 70 /** Set the output voltage, represented as an unsigned short in the range [0x0, 0xFFFF]
jhon309 0:c52df770855b 71 *
jhon309 0:c52df770855b 72 * @param value 16-bit unsigned short representing the output voltage,
jhon309 0:c52df770855b 73 * normalised to a 16-bit value (0x0000 = 0v, 0xFFFF = 3.3v)
jhon309 0:c52df770855b 74 */
jhon309 0:c52df770855b 75 void write_u16(unsigned short value) {
jhon309 0:c52df770855b 76 analogout_write_u16(&_dac, value);
jhon309 0:c52df770855b 77 }
jhon309 0:c52df770855b 78
jhon309 0:c52df770855b 79 /** Return the current output voltage setting, measured as a percentage (float)
jhon309 0:c52df770855b 80 *
jhon309 0:c52df770855b 81 * @returns
jhon309 0:c52df770855b 82 * A floating-point value representing the current voltage being output on the pin,
jhon309 0:c52df770855b 83 * measured as a percentage. The returned value will lie between
jhon309 0:c52df770855b 84 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
jhon309 0:c52df770855b 85 *
jhon309 0:c52df770855b 86 * @note
jhon309 0:c52df770855b 87 * This value may not match exactly the value set by a previous write().
jhon309 0:c52df770855b 88 */
jhon309 0:c52df770855b 89 float read() {
jhon309 0:c52df770855b 90 return analogout_read(&_dac);
jhon309 0:c52df770855b 91 }
jhon309 0:c52df770855b 92
jhon309 0:c52df770855b 93 #ifdef MBED_OPERATORS
jhon309 0:c52df770855b 94 /** An operator shorthand for write()
jhon309 0:c52df770855b 95 */
jhon309 0:c52df770855b 96 AnalogOut& operator= (float percent) {
jhon309 0:c52df770855b 97 write(percent);
jhon309 0:c52df770855b 98 return *this;
jhon309 0:c52df770855b 99 }
jhon309 0:c52df770855b 100
jhon309 0:c52df770855b 101 AnalogOut& operator= (AnalogOut& rhs) {
jhon309 0:c52df770855b 102 write(rhs.read());
jhon309 0:c52df770855b 103 return *this;
jhon309 0:c52df770855b 104 }
jhon309 0:c52df770855b 105
jhon309 0:c52df770855b 106 /** An operator shorthand for read()
jhon309 0:c52df770855b 107 */
jhon309 0:c52df770855b 108 operator float() {
jhon309 0:c52df770855b 109 return read();
jhon309 0:c52df770855b 110 }
jhon309 0:c52df770855b 111 #endif
jhon309 0:c52df770855b 112
jhon309 0:c52df770855b 113 protected:
jhon309 0:c52df770855b 114 dac_t _dac;
jhon309 0:c52df770855b 115 };
jhon309 0:c52df770855b 116
jhon309 0:c52df770855b 117 } // namespace mbed
jhon309 0:c52df770855b 118
jhon309 0:c52df770855b 119 #endif
jhon309 0:c52df770855b 120
jhon309 0:c52df770855b 121 #endif