// GPIO services using PWM outputs // Copyright (C)2018-2023, Philip Munts dba Munts Technologies. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are met: // // * Redistributions of source code must retain the above copyright notice, // this list of conditions and the following disclaimer. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE // POSSIBILITY OF SUCH DAMAGE. // Use cases for this package include on/off things like an LED or a solenoid // valve driven from a PWM output. // WARNING: Depending on the PWM hardware implementation, the off duty cycle // may be slightly greater than 0 % and/or the on duty cycle may be slightly // less than 100 %. #include #include using namespace GPIO::PWM; // GPIO pin constructor Pin_Class::Pin_Class(Interfaces::PWM::Output pwmout, bool state, double dutycycle) { // Validate parameters if (dutycycle < Interfaces::PWM::DUTYCYCLE_MIN) THROW_MSG("The dutycycle parameter is out of range"); if (dutycycle > Interfaces::PWM::DUTYCYCLE_MAX) THROW_MSG("The dutycycle parameter is out of range"); this->myoutput = pwmout; this->myduty = dutycycle; this->mystate = state; } // GPIO pin methods bool Pin_Class::read(void) { return this->mystate; } void Pin_Class::write(bool state) { if (state) this->myoutput->write(this->myduty); else this->myoutput->write(Interfaces::PWM::DUTYCYCLE_MIN); this->mystate = state; }