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mbed/drivers/AnalogOut.h@0:c88c3b616c00, 2020-03-16 (annotated)

Committer:
IKobayashi
Date:
Mon Mar 16 23:37:42 2020 +0900
Revision:
0:c88c3b616c00
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IKobayashi 0:c88c3b616c00 1 /* mbed Microcontroller Library
IKobayashi 0:c88c3b616c00 2 * Copyright (c) 2006-2013 ARM Limited
IKobayashi 0:c88c3b616c00 3 *
IKobayashi 0:c88c3b616c00 4 * Licensed under the Apache License, Version 2.0 (the "License");
IKobayashi 0:c88c3b616c00 5 * you may not use this file except in compliance with the License.
IKobayashi 0:c88c3b616c00 6 * You may obtain a copy of the License at
IKobayashi 0:c88c3b616c00 7 *
IKobayashi 0:c88c3b616c00 8 * http://www.apache.org/licenses/LICENSE-2.0
IKobayashi 0:c88c3b616c00 9 *
IKobayashi 0:c88c3b616c00 10 * Unless required by applicable law or agreed to in writing, software
IKobayashi 0:c88c3b616c00 11 * distributed under the License is distributed on an "AS IS" BASIS,
IKobayashi 0:c88c3b616c00 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
IKobayashi 0:c88c3b616c00 13 * See the License for the specific language governing permissions and
IKobayashi 0:c88c3b616c00 14 * limitations under the License.
IKobayashi 0:c88c3b616c00 15 */
IKobayashi 0:c88c3b616c00 16 #ifndef MBED_ANALOGOUT_H
IKobayashi 0:c88c3b616c00 17 #define MBED_ANALOGOUT_H
IKobayashi 0:c88c3b616c00 18
IKobayashi 0:c88c3b616c00 19 #include "platform/platform.h"
IKobayashi 0:c88c3b616c00 20
IKobayashi 0:c88c3b616c00 21 #if DEVICE_ANALOGOUT
IKobayashi 0:c88c3b616c00 22
IKobayashi 0:c88c3b616c00 23 #include "hal/analogout_api.h"
IKobayashi 0:c88c3b616c00 24 #include "platform/PlatformMutex.h"
IKobayashi 0:c88c3b616c00 25
IKobayashi 0:c88c3b616c00 26 namespace mbed {
IKobayashi 0:c88c3b616c00 27 /** \addtogroup drivers */
IKobayashi 0:c88c3b616c00 28 /** @{*/
IKobayashi 0:c88c3b616c00 29
IKobayashi 0:c88c3b616c00 30 /** An analog output, used for setting the voltage on a pin
IKobayashi 0:c88c3b616c00 31 *
IKobayashi 0:c88c3b616c00 32 * @Note Synchronization level: Thread safe
IKobayashi 0:c88c3b616c00 33 *
IKobayashi 0:c88c3b616c00 34 * Example:
IKobayashi 0:c88c3b616c00 35 * @code
IKobayashi 0:c88c3b616c00 36 * // Make a sawtooth output
IKobayashi 0:c88c3b616c00 37 *
IKobayashi 0:c88c3b616c00 38 * #include "mbed.h"
IKobayashi 0:c88c3b616c00 39 *
IKobayashi 0:c88c3b616c00 40 * AnalogOut tri(p18);
IKobayashi 0:c88c3b616c00 41 * int main() {
IKobayashi 0:c88c3b616c00 42 * while(1) {
IKobayashi 0:c88c3b616c00 43 * tri = tri + 0.01;
IKobayashi 0:c88c3b616c00 44 * wait_us(1);
IKobayashi 0:c88c3b616c00 45 * if(tri == 1) {
IKobayashi 0:c88c3b616c00 46 * tri = 0;
IKobayashi 0:c88c3b616c00 47 * }
IKobayashi 0:c88c3b616c00 48 * }
IKobayashi 0:c88c3b616c00 49 * }
IKobayashi 0:c88c3b616c00 50 * @endcode
IKobayashi 0:c88c3b616c00 51 */
IKobayashi 0:c88c3b616c00 52 class AnalogOut {
IKobayashi 0:c88c3b616c00 53
IKobayashi 0:c88c3b616c00 54 public:
IKobayashi 0:c88c3b616c00 55
IKobayashi 0:c88c3b616c00 56 /** Create an AnalogOut connected to the specified pin
IKobayashi 0:c88c3b616c00 57 *
IKobayashi 0:c88c3b616c00 58 * @param AnalogOut pin to connect to (18)
IKobayashi 0:c88c3b616c00 59 */
IKobayashi 0:c88c3b616c00 60 AnalogOut(PinName pin) {
IKobayashi 0:c88c3b616c00 61 analogout_init(&_dac, pin);
IKobayashi 0:c88c3b616c00 62 }
IKobayashi 0:c88c3b616c00 63
IKobayashi 0:c88c3b616c00 64 /** Set the output voltage, specified as a percentage (float)
IKobayashi 0:c88c3b616c00 65 *
IKobayashi 0:c88c3b616c00 66 * @param value A floating-point value representing the output voltage,
IKobayashi 0:c88c3b616c00 67 * specified as a percentage. The value should lie between
IKobayashi 0:c88c3b616c00 68 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
IKobayashi 0:c88c3b616c00 69 * Values outside this range will be saturated to 0.0f or 1.0f.
IKobayashi 0:c88c3b616c00 70 */
IKobayashi 0:c88c3b616c00 71 void write(float value) {
IKobayashi 0:c88c3b616c00 72 lock();
IKobayashi 0:c88c3b616c00 73 analogout_write(&_dac, value);
IKobayashi 0:c88c3b616c00 74 unlock();
IKobayashi 0:c88c3b616c00 75 }
IKobayashi 0:c88c3b616c00 76
IKobayashi 0:c88c3b616c00 77 /** Set the output voltage, represented as an unsigned short in the range [0x0, 0xFFFF]
IKobayashi 0:c88c3b616c00 78 *
IKobayashi 0:c88c3b616c00 79 * @param value 16-bit unsigned short representing the output voltage,
IKobayashi 0:c88c3b616c00 80 * normalised to a 16-bit value (0x0000 = 0v, 0xFFFF = 3.3v)
IKobayashi 0:c88c3b616c00 81 */
IKobayashi 0:c88c3b616c00 82 void write_u16(unsigned short value) {
IKobayashi 0:c88c3b616c00 83 lock();
IKobayashi 0:c88c3b616c00 84 analogout_write_u16(&_dac, value);
IKobayashi 0:c88c3b616c00 85 unlock();
IKobayashi 0:c88c3b616c00 86 }
IKobayashi 0:c88c3b616c00 87
IKobayashi 0:c88c3b616c00 88 /** Return the current output voltage setting, measured as a percentage (float)
IKobayashi 0:c88c3b616c00 89 *
IKobayashi 0:c88c3b616c00 90 * @returns
IKobayashi 0:c88c3b616c00 91 * A floating-point value representing the current voltage being output on the pin,
IKobayashi 0:c88c3b616c00 92 * measured as a percentage. The returned value will lie between
IKobayashi 0:c88c3b616c00 93 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
IKobayashi 0:c88c3b616c00 94 *
IKobayashi 0:c88c3b616c00 95 * @note
IKobayashi 0:c88c3b616c00 96 * This value may not match exactly the value set by a previous write().
IKobayashi 0:c88c3b616c00 97 */
IKobayashi 0:c88c3b616c00 98 float read() {
IKobayashi 0:c88c3b616c00 99 lock();
IKobayashi 0:c88c3b616c00 100 float ret = analogout_read(&_dac);
IKobayashi 0:c88c3b616c00 101 unlock();
IKobayashi 0:c88c3b616c00 102 return ret;
IKobayashi 0:c88c3b616c00 103 }
IKobayashi 0:c88c3b616c00 104
IKobayashi 0:c88c3b616c00 105 /** An operator shorthand for write()
IKobayashi 0:c88c3b616c00 106 */
IKobayashi 0:c88c3b616c00 107 AnalogOut& operator= (float percent) {
IKobayashi 0:c88c3b616c00 108 // Underlying write call is thread safe
IKobayashi 0:c88c3b616c00 109 write(percent);
IKobayashi 0:c88c3b616c00 110 return *this;
IKobayashi 0:c88c3b616c00 111 }
IKobayashi 0:c88c3b616c00 112
IKobayashi 0:c88c3b616c00 113 AnalogOut& operator= (AnalogOut& rhs) {
IKobayashi 0:c88c3b616c00 114 // Underlying write call is thread safe
IKobayashi 0:c88c3b616c00 115 write(rhs.read());
IKobayashi 0:c88c3b616c00 116 return *this;
IKobayashi 0:c88c3b616c00 117 }
IKobayashi 0:c88c3b616c00 118
IKobayashi 0:c88c3b616c00 119 /** An operator shorthand for read()
IKobayashi 0:c88c3b616c00 120 */
IKobayashi 0:c88c3b616c00 121 operator float() {
IKobayashi 0:c88c3b616c00 122 // Underlying read call is thread safe
IKobayashi 0:c88c3b616c00 123 return read();
IKobayashi 0:c88c3b616c00 124 }
IKobayashi 0:c88c3b616c00 125
IKobayashi 0:c88c3b616c00 126 virtual ~AnalogOut() {
IKobayashi 0:c88c3b616c00 127 // Do nothing
IKobayashi 0:c88c3b616c00 128 }
IKobayashi 0:c88c3b616c00 129
IKobayashi 0:c88c3b616c00 130 protected:
IKobayashi 0:c88c3b616c00 131
IKobayashi 0:c88c3b616c00 132 virtual void lock() {
IKobayashi 0:c88c3b616c00 133 _mutex.lock();
IKobayashi 0:c88c3b616c00 134 }
IKobayashi 0:c88c3b616c00 135
IKobayashi 0:c88c3b616c00 136 virtual void unlock() {
IKobayashi 0:c88c3b616c00 137 _mutex.unlock();
IKobayashi 0:c88c3b616c00 138 }
IKobayashi 0:c88c3b616c00 139
IKobayashi 0:c88c3b616c00 140 dac_t _dac;
IKobayashi 0:c88c3b616c00 141 PlatformMutex _mutex;
IKobayashi 0:c88c3b616c00 142 };
IKobayashi 0:c88c3b616c00 143
IKobayashi 0:c88c3b616c00 144 } // namespace mbed
IKobayashi 0:c88c3b616c00 145
IKobayashi 0:c88c3b616c00 146 #endif
IKobayashi 0:c88c3b616c00 147
IKobayashi 0:c88c3b616c00 148 #endif
IKobayashi 0:c88c3b616c00 149
IKobayashi 0:c88c3b616c00 150 /** @}*/