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mbed/drivers/AnalogOut.h@0:d6c9b09b4042, 2020-12-02 (annotated)

Committer:
annieluo2
Date:
Wed Dec 02 18:02:03 2020 +0000
Revision:
0:d6c9b09b4042
boo

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annieluo2 0:d6c9b09b4042 1 /* mbed Microcontroller Library
annieluo2 0:d6c9b09b4042 2 * Copyright (c) 2006-2013 ARM Limited
annieluo2 0:d6c9b09b4042 3 *
annieluo2 0:d6c9b09b4042 4 * Licensed under the Apache License, Version 2.0 (the "License");
annieluo2 0:d6c9b09b4042 5 * you may not use this file except in compliance with the License.
annieluo2 0:d6c9b09b4042 6 * You may obtain a copy of the License at
annieluo2 0:d6c9b09b4042 7 *
annieluo2 0:d6c9b09b4042 8 * http://www.apache.org/licenses/LICENSE-2.0
annieluo2 0:d6c9b09b4042 9 *
annieluo2 0:d6c9b09b4042 10 * Unless required by applicable law or agreed to in writing, software
annieluo2 0:d6c9b09b4042 11 * distributed under the License is distributed on an "AS IS" BASIS,
annieluo2 0:d6c9b09b4042 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
annieluo2 0:d6c9b09b4042 13 * See the License for the specific language governing permissions and
annieluo2 0:d6c9b09b4042 14 * limitations under the License.
annieluo2 0:d6c9b09b4042 15 */
annieluo2 0:d6c9b09b4042 16 #ifndef MBED_ANALOGOUT_H
annieluo2 0:d6c9b09b4042 17 #define MBED_ANALOGOUT_H
annieluo2 0:d6c9b09b4042 18
annieluo2 0:d6c9b09b4042 19 #include "platform/platform.h"
annieluo2 0:d6c9b09b4042 20
annieluo2 0:d6c9b09b4042 21 #if DEVICE_ANALOGOUT
annieluo2 0:d6c9b09b4042 22
annieluo2 0:d6c9b09b4042 23 #include "hal/analogout_api.h"
annieluo2 0:d6c9b09b4042 24 #include "platform/PlatformMutex.h"
annieluo2 0:d6c9b09b4042 25
annieluo2 0:d6c9b09b4042 26 namespace mbed {
annieluo2 0:d6c9b09b4042 27 /** \addtogroup drivers */
annieluo2 0:d6c9b09b4042 28 /** @{*/
annieluo2 0:d6c9b09b4042 29
annieluo2 0:d6c9b09b4042 30 /** An analog output, used for setting the voltage on a pin
annieluo2 0:d6c9b09b4042 31 *
annieluo2 0:d6c9b09b4042 32 * @Note Synchronization level: Thread safe
annieluo2 0:d6c9b09b4042 33 *
annieluo2 0:d6c9b09b4042 34 * Example:
annieluo2 0:d6c9b09b4042 35 * @code
annieluo2 0:d6c9b09b4042 36 * // Make a sawtooth output
annieluo2 0:d6c9b09b4042 37 *
annieluo2 0:d6c9b09b4042 38 * #include "mbed.h"
annieluo2 0:d6c9b09b4042 39 *
annieluo2 0:d6c9b09b4042 40 * AnalogOut tri(p18);
annieluo2 0:d6c9b09b4042 41 * int main() {
annieluo2 0:d6c9b09b4042 42 * while(1) {
annieluo2 0:d6c9b09b4042 43 * tri = tri + 0.01;
annieluo2 0:d6c9b09b4042 44 * wait_us(1);
annieluo2 0:d6c9b09b4042 45 * if(tri == 1) {
annieluo2 0:d6c9b09b4042 46 * tri = 0;
annieluo2 0:d6c9b09b4042 47 * }
annieluo2 0:d6c9b09b4042 48 * }
annieluo2 0:d6c9b09b4042 49 * }
annieluo2 0:d6c9b09b4042 50 * @endcode
annieluo2 0:d6c9b09b4042 51 */
annieluo2 0:d6c9b09b4042 52 class AnalogOut {
annieluo2 0:d6c9b09b4042 53
annieluo2 0:d6c9b09b4042 54 public:
annieluo2 0:d6c9b09b4042 55
annieluo2 0:d6c9b09b4042 56 /** Create an AnalogOut connected to the specified pin
annieluo2 0:d6c9b09b4042 57 *
annieluo2 0:d6c9b09b4042 58 * @param AnalogOut pin to connect to (18)
annieluo2 0:d6c9b09b4042 59 */
annieluo2 0:d6c9b09b4042 60 AnalogOut(PinName pin) {
annieluo2 0:d6c9b09b4042 61 analogout_init(&_dac, pin);
annieluo2 0:d6c9b09b4042 62 }
annieluo2 0:d6c9b09b4042 63
annieluo2 0:d6c9b09b4042 64 /** Set the output voltage, specified as a percentage (float)
annieluo2 0:d6c9b09b4042 65 *
annieluo2 0:d6c9b09b4042 66 * @param value A floating-point value representing the output voltage,
annieluo2 0:d6c9b09b4042 67 * specified as a percentage. The value should lie between
annieluo2 0:d6c9b09b4042 68 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
annieluo2 0:d6c9b09b4042 69 * Values outside this range will be saturated to 0.0f or 1.0f.
annieluo2 0:d6c9b09b4042 70 */
annieluo2 0:d6c9b09b4042 71 void write(float value) {
annieluo2 0:d6c9b09b4042 72 lock();
annieluo2 0:d6c9b09b4042 73 analogout_write(&_dac, value);
annieluo2 0:d6c9b09b4042 74 unlock();
annieluo2 0:d6c9b09b4042 75 }
annieluo2 0:d6c9b09b4042 76
annieluo2 0:d6c9b09b4042 77 /** Set the output voltage, represented as an unsigned short in the range [0x0, 0xFFFF]
annieluo2 0:d6c9b09b4042 78 *
annieluo2 0:d6c9b09b4042 79 * @param value 16-bit unsigned short representing the output voltage,
annieluo2 0:d6c9b09b4042 80 * normalised to a 16-bit value (0x0000 = 0v, 0xFFFF = 3.3v)
annieluo2 0:d6c9b09b4042 81 */
annieluo2 0:d6c9b09b4042 82 void write_u16(unsigned short value) {
annieluo2 0:d6c9b09b4042 83 lock();
annieluo2 0:d6c9b09b4042 84 analogout_write_u16(&_dac, value);
annieluo2 0:d6c9b09b4042 85 unlock();
annieluo2 0:d6c9b09b4042 86 }
annieluo2 0:d6c9b09b4042 87
annieluo2 0:d6c9b09b4042 88 /** Return the current output voltage setting, measured as a percentage (float)
annieluo2 0:d6c9b09b4042 89 *
annieluo2 0:d6c9b09b4042 90 * @returns
annieluo2 0:d6c9b09b4042 91 * A floating-point value representing the current voltage being output on the pin,
annieluo2 0:d6c9b09b4042 92 * measured as a percentage. The returned value will lie between
annieluo2 0:d6c9b09b4042 93 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
annieluo2 0:d6c9b09b4042 94 *
annieluo2 0:d6c9b09b4042 95 * @note
annieluo2 0:d6c9b09b4042 96 * This value may not match exactly the value set by a previous write().
annieluo2 0:d6c9b09b4042 97 */
annieluo2 0:d6c9b09b4042 98 float read() {
annieluo2 0:d6c9b09b4042 99 lock();
annieluo2 0:d6c9b09b4042 100 float ret = analogout_read(&_dac);
annieluo2 0:d6c9b09b4042 101 unlock();
annieluo2 0:d6c9b09b4042 102 return ret;
annieluo2 0:d6c9b09b4042 103 }
annieluo2 0:d6c9b09b4042 104
annieluo2 0:d6c9b09b4042 105 /** An operator shorthand for write()
annieluo2 0:d6c9b09b4042 106 */
annieluo2 0:d6c9b09b4042 107 AnalogOut& operator= (float percent) {
annieluo2 0:d6c9b09b4042 108 // Underlying write call is thread safe
annieluo2 0:d6c9b09b4042 109 write(percent);
annieluo2 0:d6c9b09b4042 110 return *this;
annieluo2 0:d6c9b09b4042 111 }
annieluo2 0:d6c9b09b4042 112
annieluo2 0:d6c9b09b4042 113 AnalogOut& operator= (AnalogOut& rhs) {
annieluo2 0:d6c9b09b4042 114 // Underlying write call is thread safe
annieluo2 0:d6c9b09b4042 115 write(rhs.read());
annieluo2 0:d6c9b09b4042 116 return *this;
annieluo2 0:d6c9b09b4042 117 }
annieluo2 0:d6c9b09b4042 118
annieluo2 0:d6c9b09b4042 119 /** An operator shorthand for read()
annieluo2 0:d6c9b09b4042 120 */
annieluo2 0:d6c9b09b4042 121 operator float() {
annieluo2 0:d6c9b09b4042 122 // Underlying read call is thread safe
annieluo2 0:d6c9b09b4042 123 return read();
annieluo2 0:d6c9b09b4042 124 }
annieluo2 0:d6c9b09b4042 125
annieluo2 0:d6c9b09b4042 126 virtual ~AnalogOut() {
annieluo2 0:d6c9b09b4042 127 // Do nothing
annieluo2 0:d6c9b09b4042 128 }
annieluo2 0:d6c9b09b4042 129
annieluo2 0:d6c9b09b4042 130 protected:
annieluo2 0:d6c9b09b4042 131
annieluo2 0:d6c9b09b4042 132 virtual void lock() {
annieluo2 0:d6c9b09b4042 133 _mutex.lock();
annieluo2 0:d6c9b09b4042 134 }
annieluo2 0:d6c9b09b4042 135
annieluo2 0:d6c9b09b4042 136 virtual void unlock() {
annieluo2 0:d6c9b09b4042 137 _mutex.unlock();
annieluo2 0:d6c9b09b4042 138 }
annieluo2 0:d6c9b09b4042 139
annieluo2 0:d6c9b09b4042 140 dac_t _dac;
annieluo2 0:d6c9b09b4042 141 PlatformMutex _mutex;
annieluo2 0:d6c9b09b4042 142 };
annieluo2 0:d6c9b09b4042 143
annieluo2 0:d6c9b09b4042 144 } // namespace mbed
annieluo2 0:d6c9b09b4042 145
annieluo2 0:d6c9b09b4042 146 #endif
annieluo2 0:d6c9b09b4042 147
annieluo2 0:d6c9b09b4042 148 #endif
annieluo2 0:d6c9b09b4042 149
annieluo2 0:d6c9b09b4042 150 /** @}*/