[11U68]fix P0_11 to use GPIO
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AnalogOut.h
00001 /* mbed Microcontroller Library 00002 * Copyright (c) 2006-2013 ARM Limited 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http://www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 #ifndef MBED_ANALOGOUT_H 00017 #define MBED_ANALOGOUT_H 00018 00019 #include "platform.h" 00020 00021 #if DEVICE_ANALOGOUT 00022 00023 #include "analogout_api.h" 00024 00025 namespace mbed { 00026 00027 /** An analog output, used for setting the voltage on a pin 00028 * 00029 * Example: 00030 * @code 00031 * // Make a sawtooth output 00032 * 00033 * #include "mbed.h" 00034 * 00035 * AnalogOut tri(p18); 00036 * int main() { 00037 * while(1) { 00038 * tri = tri + 0.01; 00039 * wait_us(1); 00040 * if(tri == 1) { 00041 * tri = 0; 00042 * } 00043 * } 00044 * } 00045 * @endcode 00046 */ 00047 class AnalogOut { 00048 00049 public: 00050 00051 /** Create an AnalogOut connected to the specified pin 00052 * 00053 * @param AnalogOut pin to connect to (18) 00054 */ 00055 AnalogOut(PinName pin) { 00056 analogout_init(&_dac, pin); 00057 } 00058 00059 /** Set the output voltage, specified as a percentage (float) 00060 * 00061 * @param value A floating-point value representing the output voltage, 00062 * specified as a percentage. The value should lie between 00063 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%). 00064 * Values outside this range will be saturated to 0.0f or 1.0f. 00065 */ 00066 void write(float value) { 00067 analogout_write(&_dac, value); 00068 } 00069 00070 /** Set the output voltage, represented as an unsigned short in the range [0x0, 0xFFFF] 00071 * 00072 * @param value 16-bit unsigned short representing the output voltage, 00073 * normalised to a 16-bit value (0x0000 = 0v, 0xFFFF = 3.3v) 00074 */ 00075 void write_u16(unsigned short value) { 00076 analogout_write_u16(&_dac, value); 00077 } 00078 00079 /** Return the current output voltage setting, measured as a percentage (float) 00080 * 00081 * @returns 00082 * A floating-point value representing the current voltage being output on the pin, 00083 * measured as a percentage. The returned value will lie between 00084 * 0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%). 00085 * 00086 * @note 00087 * This value may not match exactly the value set by a previous write(). 00088 */ 00089 float read() { 00090 return analogout_read(&_dac); 00091 } 00092 00093 #ifdef MBED_OPERATORS 00094 /** An operator shorthand for write() 00095 */ 00096 AnalogOut& operator= (float percent) { 00097 write(percent); 00098 return *this; 00099 } 00100 00101 AnalogOut& operator= (AnalogOut& rhs) { 00102 write(rhs.read()); 00103 return *this; 00104 } 00105 00106 /** An operator shorthand for read() 00107 */ 00108 operator float() { 00109 return read(); 00110 } 00111 #endif 00112 00113 protected: 00114 dac_t _dac; 00115 }; 00116 00117 } // namespace mbed 00118 00119 #endif 00120 00121 #endif
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