Yihui Xiong / Seeed_nRF51822_MPU9250

Use MPU9250 with nRF51822

Dependencies:   eMPL_MPU

Fork of Seeed_Tiny_BLE_Flash by Darren Huang

mbed-src/api/AnalogOut.h@5:9b240c1d5251, 2015-12-10 (annotated)

Committer:
yihui
Date:
Thu Dec 10 08:00:18 2015 +0000
Revision:
5:9b240c1d5251
get 9dof data from mpu9250

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yihui 5:9b240c1d5251 1 /* mbed Microcontroller Library
yihui 5:9b240c1d5251 2 * Copyright (c) 2006-2013 ARM Limited
yihui 5:9b240c1d5251 3 *
yihui 5:9b240c1d5251 4 * Licensed under the Apache License, Version 2.0 (the "License");
yihui 5:9b240c1d5251 5 * you may not use this file except in compliance with the License.
yihui 5:9b240c1d5251 6 * You may obtain a copy of the License at
yihui 5:9b240c1d5251 7 *
yihui 5:9b240c1d5251 8 * http://www.apache.org/licenses/LICENSE-2.0
yihui 5:9b240c1d5251 9 *
yihui 5:9b240c1d5251 10 * Unless required by applicable law or agreed to in writing, software
yihui 5:9b240c1d5251 11 * distributed under the License is distributed on an "AS IS" BASIS,
yihui 5:9b240c1d5251 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
yihui 5:9b240c1d5251 13 * See the License for the specific language governing permissions and
yihui 5:9b240c1d5251 14 * limitations under the License.
yihui 5:9b240c1d5251 15 */
yihui 5:9b240c1d5251 16 #ifndef MBED_ANALOGOUT_H
yihui 5:9b240c1d5251 17 #define MBED_ANALOGOUT_H
yihui 5:9b240c1d5251 18
yihui 5:9b240c1d5251 19 #include "platform.h"
yihui 5:9b240c1d5251 20
yihui 5:9b240c1d5251 21 #if DEVICE_ANALOGOUT
yihui 5:9b240c1d5251 22
yihui 5:9b240c1d5251 23 #include "analogout_api.h"
yihui 5:9b240c1d5251 24
yihui 5:9b240c1d5251 25 namespace mbed {
yihui 5:9b240c1d5251 26
yihui 5:9b240c1d5251 27 /** An analog output, used for setting the voltage on a pin
yihui 5:9b240c1d5251 28 *
yihui 5:9b240c1d5251 29 * Example:
yihui 5:9b240c1d5251 30 * @code
yihui 5:9b240c1d5251 31 * // Make a sawtooth output
yihui 5:9b240c1d5251 32 *
yihui 5:9b240c1d5251 33 * #include "mbed.h"
yihui 5:9b240c1d5251 34 *
yihui 5:9b240c1d5251 35 * AnalogOut tri(p18);
yihui 5:9b240c1d5251 36 * int main() {
yihui 5:9b240c1d5251 37 * while(1) {
yihui 5:9b240c1d5251 38 * tri = tri + 0.01;
yihui 5:9b240c1d5251 39 * wait_us(1);
yihui 5:9b240c1d5251 40 * if(tri == 1) {
yihui 5:9b240c1d5251 41 * tri = 0;
yihui 5:9b240c1d5251 42 * }
yihui 5:9b240c1d5251 43 * }
yihui 5:9b240c1d5251 44 * }
yihui 5:9b240c1d5251 45 * @endcode
yihui 5:9b240c1d5251 46 */
yihui 5:9b240c1d5251 47 class AnalogOut {
yihui 5:9b240c1d5251 48
yihui 5:9b240c1d5251 49 public:
yihui 5:9b240c1d5251 50
yihui 5:9b240c1d5251 51 /** Create an AnalogOut connected to the specified pin
yihui 5:9b240c1d5251 52 *
yihui 5:9b240c1d5251 53 * @param AnalogOut pin to connect to (18)
yihui 5:9b240c1d5251 54 */
yihui 5:9b240c1d5251 55 AnalogOut(PinName pin) {
yihui 5:9b240c1d5251 56 analogout_init(&_dac, pin);
yihui 5:9b240c1d5251 57 }
yihui 5:9b240c1d5251 58
yihui 5:9b240c1d5251 59 /** Set the output voltage, specified as a percentage (float)
yihui 5:9b240c1d5251 60 *
yihui 5:9b240c1d5251 61 * @param value A floating-point value representing the output voltage,
yihui 5:9b240c1d5251 62 * specified as a percentage. The value should lie between
yihui 5:9b240c1d5251 63 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
yihui 5:9b240c1d5251 64 * Values outside this range will be saturated to 0.0f or 1.0f.
yihui 5:9b240c1d5251 65 */
yihui 5:9b240c1d5251 66 void write(float value) {
yihui 5:9b240c1d5251 67 analogout_write(&_dac, value);
yihui 5:9b240c1d5251 68 }
yihui 5:9b240c1d5251 69
yihui 5:9b240c1d5251 70 /** Set the output voltage, represented as an unsigned short in the range [0x0, 0xFFFF]
yihui 5:9b240c1d5251 71 *
yihui 5:9b240c1d5251 72 * @param value 16-bit unsigned short representing the output voltage,
yihui 5:9b240c1d5251 73 * normalised to a 16-bit value (0x0000 = 0v, 0xFFFF = 3.3v)
yihui 5:9b240c1d5251 74 */
yihui 5:9b240c1d5251 75 void write_u16(unsigned short value) {
yihui 5:9b240c1d5251 76 analogout_write_u16(&_dac, value);
yihui 5:9b240c1d5251 77 }
yihui 5:9b240c1d5251 78
yihui 5:9b240c1d5251 79 /** Return the current output voltage setting, measured as a percentage (float)
yihui 5:9b240c1d5251 80 *
yihui 5:9b240c1d5251 81 * @returns
yihui 5:9b240c1d5251 82 * A floating-point value representing the current voltage being output on the pin,
yihui 5:9b240c1d5251 83 * measured as a percentage. The returned value will lie between
yihui 5:9b240c1d5251 84 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
yihui 5:9b240c1d5251 85 *
yihui 5:9b240c1d5251 86 * @note
yihui 5:9b240c1d5251 87 * This value may not match exactly the value set by a previous write().
yihui 5:9b240c1d5251 88 */
yihui 5:9b240c1d5251 89 float read() {
yihui 5:9b240c1d5251 90 return analogout_read(&_dac);
yihui 5:9b240c1d5251 91 }
yihui 5:9b240c1d5251 92
yihui 5:9b240c1d5251 93 #ifdef MBED_OPERATORS
yihui 5:9b240c1d5251 94 /** An operator shorthand for write()
yihui 5:9b240c1d5251 95 */
yihui 5:9b240c1d5251 96 AnalogOut& operator= (float percent) {
yihui 5:9b240c1d5251 97 write(percent);
yihui 5:9b240c1d5251 98 return *this;
yihui 5:9b240c1d5251 99 }
yihui 5:9b240c1d5251 100
yihui 5:9b240c1d5251 101 AnalogOut& operator= (AnalogOut& rhs) {
yihui 5:9b240c1d5251 102 write(rhs.read());
yihui 5:9b240c1d5251 103 return *this;
yihui 5:9b240c1d5251 104 }
yihui 5:9b240c1d5251 105
yihui 5:9b240c1d5251 106 /** An operator shorthand for read()
yihui 5:9b240c1d5251 107 */
yihui 5:9b240c1d5251 108 operator float() {
yihui 5:9b240c1d5251 109 return read();
yihui 5:9b240c1d5251 110 }
yihui 5:9b240c1d5251 111 #endif
yihui 5:9b240c1d5251 112
yihui 5:9b240c1d5251 113 protected:
yihui 5:9b240c1d5251 114 dac_t _dac;
yihui 5:9b240c1d5251 115 };
yihui 5:9b240c1d5251 116
yihui 5:9b240c1d5251 117 } // namespace mbed
yihui 5:9b240c1d5251 118
yihui 5:9b240c1d5251 119 #endif
yihui 5:9b240c1d5251 120
yihui 5:9b240c1d5251 121 #endif