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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

api/AnalogOut.h@635:a11c0372f0ba, 2015-09-30 (annotated)

Committer:
mbed_official
Date:
Wed Sep 30 17:00:09 2015 +0100
Revision:
635:a11c0372f0ba
Parent:
13:0645d8841f51 
Synchronized with git revision d29c98dae61be0946ddf3a3c641c7726056f9452



Full URL: https://github.com/mbedmicro/mbed/commit/d29c98dae61be0946ddf3a3c641c7726056f9452/



Added support for SAMW25

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 13:0645d8841f51 1 /* mbed Microcontroller Library
bogdanm 13:0645d8841f51 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 13:0645d8841f51 3 *
bogdanm 13:0645d8841f51 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 13:0645d8841f51 5 * you may not use this file except in compliance with the License.
bogdanm 13:0645d8841f51 6 * You may obtain a copy of the License at
bogdanm 13:0645d8841f51 7 *
bogdanm 13:0645d8841f51 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 13:0645d8841f51 9 *
bogdanm 13:0645d8841f51 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 13:0645d8841f51 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 13:0645d8841f51 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 13:0645d8841f51 13 * See the License for the specific language governing permissions and
bogdanm 13:0645d8841f51 14 * limitations under the License.
bogdanm 13:0645d8841f51 15 */
bogdanm 13:0645d8841f51 16 #ifndef MBED_ANALOGOUT_H
bogdanm 13:0645d8841f51 17 #define MBED_ANALOGOUT_H
bogdanm 13:0645d8841f51 18
bogdanm 13:0645d8841f51 19 #include "platform.h"
bogdanm 13:0645d8841f51 20
bogdanm 13:0645d8841f51 21 #if DEVICE_ANALOGOUT
bogdanm 13:0645d8841f51 22
bogdanm 13:0645d8841f51 23 #include "analogout_api.h"
bogdanm 13:0645d8841f51 24
bogdanm 13:0645d8841f51 25 namespace mbed {
bogdanm 13:0645d8841f51 26
bogdanm 13:0645d8841f51 27 /** An analog output, used for setting the voltage on a pin
bogdanm 13:0645d8841f51 28 *
bogdanm 13:0645d8841f51 29 * Example:
bogdanm 13:0645d8841f51 30 * @code
bogdanm 13:0645d8841f51 31 * // Make a sawtooth output
bogdanm 13:0645d8841f51 32 *
bogdanm 13:0645d8841f51 33 * #include "mbed.h"
bogdanm 13:0645d8841f51 34 *
bogdanm 13:0645d8841f51 35 * AnalogOut tri(p18);
bogdanm 13:0645d8841f51 36 * int main() {
bogdanm 13:0645d8841f51 37 * while(1) {
bogdanm 13:0645d8841f51 38 * tri = tri + 0.01;
bogdanm 13:0645d8841f51 39 * wait_us(1);
bogdanm 13:0645d8841f51 40 * if(tri == 1) {
bogdanm 13:0645d8841f51 41 * tri = 0;
bogdanm 13:0645d8841f51 42 * }
bogdanm 13:0645d8841f51 43 * }
bogdanm 13:0645d8841f51 44 * }
bogdanm 13:0645d8841f51 45 * @endcode
bogdanm 13:0645d8841f51 46 */
bogdanm 13:0645d8841f51 47 class AnalogOut {
bogdanm 13:0645d8841f51 48
bogdanm 13:0645d8841f51 49 public:
bogdanm 13:0645d8841f51 50
bogdanm 13:0645d8841f51 51 /** Create an AnalogOut connected to the specified pin
bogdanm 13:0645d8841f51 52 *
bogdanm 13:0645d8841f51 53 * @param AnalogOut pin to connect to (18)
bogdanm 13:0645d8841f51 54 */
bogdanm 13:0645d8841f51 55 AnalogOut(PinName pin) {
bogdanm 13:0645d8841f51 56 analogout_init(&_dac, pin);
bogdanm 13:0645d8841f51 57 }
bogdanm 13:0645d8841f51 58
bogdanm 13:0645d8841f51 59 /** Set the output voltage, specified as a percentage (float)
bogdanm 13:0645d8841f51 60 *
bogdanm 13:0645d8841f51 61 * @param value A floating-point value representing the output voltage,
bogdanm 13:0645d8841f51 62 * specified as a percentage. The value should lie between
bogdanm 13:0645d8841f51 63 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
bogdanm 13:0645d8841f51 64 * Values outside this range will be saturated to 0.0f or 1.0f.
bogdanm 13:0645d8841f51 65 */
bogdanm 13:0645d8841f51 66 void write(float value) {
bogdanm 13:0645d8841f51 67 analogout_write(&_dac, value);
bogdanm 13:0645d8841f51 68 }
bogdanm 13:0645d8841f51 69
bogdanm 13:0645d8841f51 70 /** Set the output voltage, represented as an unsigned short in the range [0x0, 0xFFFF]
bogdanm 13:0645d8841f51 71 *
bogdanm 13:0645d8841f51 72 * @param value 16-bit unsigned short representing the output voltage,
bogdanm 13:0645d8841f51 73 * normalised to a 16-bit value (0x0000 = 0v, 0xFFFF = 3.3v)
bogdanm 13:0645d8841f51 74 */
bogdanm 13:0645d8841f51 75 void write_u16(unsigned short value) {
bogdanm 13:0645d8841f51 76 analogout_write_u16(&_dac, value);
bogdanm 13:0645d8841f51 77 }
bogdanm 13:0645d8841f51 78
bogdanm 13:0645d8841f51 79 /** Return the current output voltage setting, measured as a percentage (float)
bogdanm 13:0645d8841f51 80 *
bogdanm 13:0645d8841f51 81 * @returns
bogdanm 13:0645d8841f51 82 * A floating-point value representing the current voltage being output on the pin,
bogdanm 13:0645d8841f51 83 * measured as a percentage. The returned value will lie between
bogdanm 13:0645d8841f51 84 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
bogdanm 13:0645d8841f51 85 *
bogdanm 13:0645d8841f51 86 * @note
bogdanm 13:0645d8841f51 87 * This value may not match exactly the value set by a previous write().
bogdanm 13:0645d8841f51 88 */
bogdanm 13:0645d8841f51 89 float read() {
bogdanm 13:0645d8841f51 90 return analogout_read(&_dac);
bogdanm 13:0645d8841f51 91 }
bogdanm 13:0645d8841f51 92
bogdanm 13:0645d8841f51 93 #ifdef MBED_OPERATORS
bogdanm 13:0645d8841f51 94 /** An operator shorthand for write()
bogdanm 13:0645d8841f51 95 */
bogdanm 13:0645d8841f51 96 AnalogOut& operator= (float percent) {
bogdanm 13:0645d8841f51 97 write(percent);
bogdanm 13:0645d8841f51 98 return *this;
bogdanm 13:0645d8841f51 99 }
bogdanm 13:0645d8841f51 100
bogdanm 13:0645d8841f51 101 AnalogOut& operator= (AnalogOut& rhs) {
bogdanm 13:0645d8841f51 102 write(rhs.read());
bogdanm 13:0645d8841f51 103 return *this;
bogdanm 13:0645d8841f51 104 }
bogdanm 13:0645d8841f51 105
bogdanm 13:0645d8841f51 106 /** An operator shorthand for read()
bogdanm 13:0645d8841f51 107 */
bogdanm 13:0645d8841f51 108 operator float() {
bogdanm 13:0645d8841f51 109 return read();
bogdanm 13:0645d8841f51 110 }
bogdanm 13:0645d8841f51 111 #endif
bogdanm 13:0645d8841f51 112
bogdanm 13:0645d8841f51 113 protected:
bogdanm 13:0645d8841f51 114 dac_t _dac;
bogdanm 13:0645d8841f51 115 };
bogdanm 13:0645d8841f51 116
bogdanm 13:0645d8841f51 117 } // namespace mbed
bogdanm 13:0645d8841f51 118
bogdanm 13:0645d8841f51 119 #endif
bogdanm 13:0645d8841f51 120
bogdanm 13:0645d8841f51 121 #endif