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api/AnalogOut.h@10:3bc89ef62ce7, 2013-06-14 (annotated)

Committer:
emilmont
Date:
Fri Jun 14 17:49:17 2013 +0100
Revision:
10:3bc89ef62ce7
Parent:
9:0ce32e54c9a7
Child:
13:0645d8841f51
Unify mbed library sources

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 10:3bc89ef62ce7 1 /* mbed Microcontroller Library
emilmont 10:3bc89ef62ce7 2 * Copyright (c) 2006-2013 ARM Limited
emilmont 10:3bc89ef62ce7 3 *
emilmont 10:3bc89ef62ce7 4 * Licensed under the Apache License, Version 2.0 (the "License");
emilmont 10:3bc89ef62ce7 5 * you may not use this file except in compliance with the License.
emilmont 10:3bc89ef62ce7 6 * You may obtain a copy of the License at
emilmont 10:3bc89ef62ce7 7 *
emilmont 10:3bc89ef62ce7 8 * http://www.apache.org/licenses/LICENSE-2.0
emilmont 10:3bc89ef62ce7 9 *
emilmont 10:3bc89ef62ce7 10 * Unless required by applicable law or agreed to in writing, software
emilmont 10:3bc89ef62ce7 11 * distributed under the License is distributed on an "AS IS" BASIS,
emilmont 10:3bc89ef62ce7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
emilmont 10:3bc89ef62ce7 13 * See the License for the specific language governing permissions and
emilmont 10:3bc89ef62ce7 14 * limitations under the License.
emilmont 10:3bc89ef62ce7 15 */
emilmont 10:3bc89ef62ce7 16 #ifndef MBED_ANALOGOUT_H
emilmont 10:3bc89ef62ce7 17 #define MBED_ANALOGOUT_H
emilmont 10:3bc89ef62ce7 18
emilmont 10:3bc89ef62ce7 19 #include "platform.h"
emilmont 10:3bc89ef62ce7 20
emilmont 10:3bc89ef62ce7 21 #if DEVICE_ANALOGOUT
emilmont 10:3bc89ef62ce7 22
emilmont 10:3bc89ef62ce7 23 #include "analogout_api.h"
emilmont 10:3bc89ef62ce7 24
emilmont 10:3bc89ef62ce7 25 namespace mbed {
emilmont 10:3bc89ef62ce7 26
emilmont 10:3bc89ef62ce7 27 /** An analog output, used for setting the voltage on a pin
emilmont 10:3bc89ef62ce7 28 *
emilmont 10:3bc89ef62ce7 29 * Example:
emilmont 10:3bc89ef62ce7 30 * @code
emilmont 10:3bc89ef62ce7 31 * // Make a sawtooth output
emilmont 10:3bc89ef62ce7 32 *
emilmont 10:3bc89ef62ce7 33 * #include "mbed.h"
emilmont 10:3bc89ef62ce7 34 *
emilmont 10:3bc89ef62ce7 35 * AnalogOut tri(p18);
emilmont 10:3bc89ef62ce7 36 * int main() {
emilmont 10:3bc89ef62ce7 37 * while(1) {
emilmont 10:3bc89ef62ce7 38 * tri = tri + 0.01;
emilmont 10:3bc89ef62ce7 39 * wait_us(1);
emilmont 10:3bc89ef62ce7 40 * if(tri == 1) {
emilmont 10:3bc89ef62ce7 41 * tri = 0;
emilmont 10:3bc89ef62ce7 42 * }
emilmont 10:3bc89ef62ce7 43 * }
emilmont 10:3bc89ef62ce7 44 * }
emilmont 10:3bc89ef62ce7 45 * @endcode
emilmont 10:3bc89ef62ce7 46 */
emilmont 10:3bc89ef62ce7 47 class AnalogOut {
emilmont 10:3bc89ef62ce7 48
emilmont 10:3bc89ef62ce7 49 public:
emilmont 10:3bc89ef62ce7 50
emilmont 10:3bc89ef62ce7 51 /** Create an AnalogOut connected to the specified pin
emilmont 10:3bc89ef62ce7 52 *
emilmont 10:3bc89ef62ce7 53 * @param AnalogOut pin to connect to (18)
emilmont 10:3bc89ef62ce7 54 */
emilmont 10:3bc89ef62ce7 55 AnalogOut(PinName pin) {
emilmont 10:3bc89ef62ce7 56 analogout_init(&_dac, pin);
emilmont 10:3bc89ef62ce7 57 }
emilmont 10:3bc89ef62ce7 58
emilmont 10:3bc89ef62ce7 59 /** Set the output voltage, specified as a percentage (float)
emilmont 10:3bc89ef62ce7 60 *
emilmont 10:3bc89ef62ce7 61 * @param value A floating-point value representing the output voltage,
emilmont 10:3bc89ef62ce7 62 * specified as a percentage. The value should lie between
emilmont 10:3bc89ef62ce7 63 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
emilmont 10:3bc89ef62ce7 64 * Values outside this range will be saturated to 0.0f or 1.0f.
emilmont 10:3bc89ef62ce7 65 */
emilmont 10:3bc89ef62ce7 66 void write(float value) {
emilmont 10:3bc89ef62ce7 67 analogout_write(&_dac, value);
emilmont 10:3bc89ef62ce7 68 }
emilmont 10:3bc89ef62ce7 69
emilmont 10:3bc89ef62ce7 70 /** Set the output voltage, represented as an unsigned short in the range [0x0, 0xFFFF]
emilmont 10:3bc89ef62ce7 71 *
emilmont 10:3bc89ef62ce7 72 * @param value 16-bit unsigned short representing the output voltage,
emilmont 10:3bc89ef62ce7 73 * normalised to a 16-bit value (0x0000 = 0v, 0xFFFF = 3.3v)
emilmont 10:3bc89ef62ce7 74 */
emilmont 10:3bc89ef62ce7 75 void write_u16(unsigned short value) {
emilmont 10:3bc89ef62ce7 76 analogout_write_u16(&_dac, value);
emilmont 10:3bc89ef62ce7 77 }
emilmont 10:3bc89ef62ce7 78
emilmont 10:3bc89ef62ce7 79 /** Return the current output voltage setting, measured as a percentage (float)
emilmont 10:3bc89ef62ce7 80 *
emilmont 10:3bc89ef62ce7 81 * @returns
emilmont 10:3bc89ef62ce7 82 * A floating-point value representing the current voltage being output on the pin,
emilmont 10:3bc89ef62ce7 83 * measured as a percentage. The returned value will lie between
emilmont 10:3bc89ef62ce7 84 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
emilmont 10:3bc89ef62ce7 85 *
emilmont 10:3bc89ef62ce7 86 * @note
emilmont 10:3bc89ef62ce7 87 * This value may not match exactly the value set by a previous write().
emilmont 10:3bc89ef62ce7 88 */
emilmont 10:3bc89ef62ce7 89 float read() {
emilmont 10:3bc89ef62ce7 90 return analogout_read(&_dac);
emilmont 10:3bc89ef62ce7 91 }
emilmont 10:3bc89ef62ce7 92
emilmont 10:3bc89ef62ce7 93 #ifdef MBED_OPERATORS
emilmont 10:3bc89ef62ce7 94 /** An operator shorthand for write()
emilmont 10:3bc89ef62ce7 95 */
emilmont 10:3bc89ef62ce7 96 AnalogOut& operator= (float percent) {
emilmont 10:3bc89ef62ce7 97 write(percent);
emilmont 10:3bc89ef62ce7 98 return *this;
emilmont 10:3bc89ef62ce7 99 }
emilmont 10:3bc89ef62ce7 100
emilmont 10:3bc89ef62ce7 101 AnalogOut& operator= (AnalogOut& rhs) {
emilmont 10:3bc89ef62ce7 102 write(rhs.read());
emilmont 10:3bc89ef62ce7 103 return *this;
emilmont 10:3bc89ef62ce7 104 }
emilmont 10:3bc89ef62ce7 105
emilmont 10:3bc89ef62ce7 106 /** An operator shorthand for read()
emilmont 10:3bc89ef62ce7 107 */
emilmont 10:3bc89ef62ce7 108 operator float() {
emilmont 10:3bc89ef62ce7 109 return read();
emilmont 10:3bc89ef62ce7 110 }
emilmont 10:3bc89ef62ce7 111 #endif
emilmont 10:3bc89ef62ce7 112
emilmont 10:3bc89ef62ce7 113 protected:
emilmont 10:3bc89ef62ce7 114 dac_t _dac;
emilmont 10:3bc89ef62ce7 115 };
emilmont 10:3bc89ef62ce7 116
emilmont 10:3bc89ef62ce7 117 } // namespace mbed
emilmont 10:3bc89ef62ce7 118
emilmont 10:3bc89ef62ce7 119 #endif
emilmont 10:3bc89ef62ce7 120
emilmont 10:3bc89ef62ce7 121 #endif