From Ben Katz mbed-dev library. Removed unnecessary target files to reduce the overall size by a factor of 10 to make it easier to import into the online IDE.
Dependents: motor_driver motor_driver_screaming_fix
Diff: drivers/AnalogIn.h
- Revision:
- 0:083111ae2a11
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/drivers/AnalogIn.h Thu Nov 26 04:08:56 2020 +0000 @@ -0,0 +1,130 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 ARM Limited + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#ifndef MBED_ANALOGIN_H +#define MBED_ANALOGIN_H + +#include "platform/platform.h" + +#if defined (DEVICE_ANALOGIN) || defined(DOXYGEN_ONLY) + +#include "hal/analogin_api.h" +#include "platform/SingletonPtr.h" +#include "platform/PlatformMutex.h" + +namespace mbed { +/** \addtogroup drivers */ + +/** An analog input, used for reading the voltage on a pin + * + * @note Synchronization level: Thread safe + * + * Example: + * @code + * // Print messages when the AnalogIn is greater than 50% + * + * #include "mbed.h" + * + * AnalogIn temperature(p20); + * + * int main() { + * while(1) { + * if(temperature > 0.5) { + * printf("Too hot! (%f)", temperature.read()); + * } + * } + * } + * @endcode + * @ingroup drivers + */ +class AnalogIn { + +public: + + /** Create an AnalogIn, connected to the specified pin + * + * @param pin AnalogIn pin to connect to + */ + AnalogIn(PinName pin) { + lock(); + analogin_init(&_adc, pin); + unlock(); + } + + /** Read the input voltage, represented as a float in the range [0.0, 1.0] + * + * @returns A floating-point value representing the current input voltage, measured as a percentage + */ + float read() { + lock(); + float ret = analogin_read(&_adc); + unlock(); + return ret; + } + + /** Read the input voltage, represented as an unsigned short in the range [0x0, 0xFFFF] + * + * @returns + * 16-bit unsigned short representing the current input voltage, normalised to a 16-bit value + */ + unsigned short read_u16() { + lock(); + unsigned short ret = analogin_read_u16(&_adc); + unlock(); + return ret; + } + + /** An operator shorthand for read() + * + * The float() operator can be used as a shorthand for read() to simplify common code sequences + * + * Example: + * @code + * float x = volume.read(); + * float x = volume; + * + * if(volume.read() > 0.25) { ... } + * if(volume > 0.25) { ... } + * @endcode + */ + operator float() { + // Underlying call is thread safe + return read(); + } + + virtual ~AnalogIn() { + // Do nothing + } + +protected: + + virtual void lock() { + _mutex->lock(); + } + + virtual void unlock() { + _mutex->unlock(); + } + + analogin_t _adc; + static SingletonPtr<PlatformMutex> _mutex; +}; + +} // namespace mbed + +#endif + +#endif +