mbed library sources: Modified to operate FRDM-KL25Z at 48MHz from internal 32kHz oscillator (nothing else changed).
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AnalogIn.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_ANALOGIN_H 00017 #define MBED_ANALOGIN_H 00018 00019 #include "platform.h" 00020 00021 #if DEVICE_ANALOGIN 00022 00023 #include "analogin_api.h" 00024 00025 namespace mbed { 00026 00027 /** An analog input, used for reading the voltage on a pin 00028 * 00029 * Example: 00030 * @code 00031 * // Print messages when the AnalogIn is greater than 50% 00032 * 00033 * #include "mbed.h" 00034 * 00035 * AnalogIn temperature(p20); 00036 * 00037 * int main() { 00038 * while(1) { 00039 * if(temperature > 0.5) { 00040 * printf("Too hot! (%f)", temperature.read()); 00041 * } 00042 * } 00043 * } 00044 * @endcode 00045 */ 00046 class AnalogIn { 00047 00048 public: 00049 00050 /** Create an AnalogIn, connected to the specified pin 00051 * 00052 * @param pin AnalogIn pin to connect to 00053 * @param name (optional) A string to identify the object 00054 */ 00055 AnalogIn(PinName pin) { 00056 analogin_init(&_adc, pin); 00057 } 00058 00059 /** Read the input voltage, represented as a float in the range [0.0, 1.0] 00060 * 00061 * @returns A floating-point value representing the current input voltage, measured as a percentage 00062 */ 00063 float read() { 00064 return analogin_read(&_adc); 00065 } 00066 00067 /** Read the input voltage, represented as an unsigned short in the range [0x0, 0xFFFF] 00068 * 00069 * @returns 00070 * 16-bit unsigned short representing the current input voltage, normalised to a 16-bit value 00071 */ 00072 unsigned short read_u16() { 00073 return analogin_read_u16(&_adc); 00074 } 00075 00076 #ifdef MBED_OPERATORS 00077 /** An operator shorthand for read() 00078 * 00079 * The float() operator can be used as a shorthand for read() to simplify common code sequences 00080 * 00081 * Example: 00082 * @code 00083 * float x = volume.read(); 00084 * float x = volume; 00085 * 00086 * if(volume.read() > 0.25) { ... } 00087 * if(volume > 0.25) { ... } 00088 * @endcode 00089 */ 00090 operator float() { 00091 return read(); 00092 } 00093 #endif 00094 00095 protected: 00096 analogin_t _adc; 00097 }; 00098 00099 } // namespace mbed 00100 00101 #endif 00102 00103 #endif
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