mirror of
https://github.com/felis/USB_Host_Shield_2.0.git
synced 2024-03-22 11:31:26 +01:00
74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
/* Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Contact information
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-------------------
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Circuits At Home, LTD
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Web : http://www.circuitsathome.com
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e-mail : support@circuitsathome.com
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UHS2_GPIO implements "wiring" style GPIO access. Implemented by Brian Walton brian@riban.co.uk
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*/
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#include "UHS2_gpio.h"
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/** @brief Implement an instance of a UHS2_GPIO object
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* @param pUSB Pointer to a UHS2 USB object
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*/
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UHS2_GPIO::UHS2_GPIO(USB *pUsb) : m_pUsb(pUsb)
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{
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}
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/** @brief Set a GPIO output value
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* @param pin GPIO output pin on USB Host Shield to set
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* @param val Value to set the pin to (zero value will clear output, non-zero value will assert output)
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*/
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void UHS2_GPIO::digitalWrite(uint8_t pin, uint8_t val) {
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if(pin > 7)
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return;
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uint8_t nValue = m_pUsb->gpioRdOutput();
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uint8_t nMask = 1 << pin;
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nValue &= (~nMask);
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if(val)
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nValue |= (nMask);
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m_pUsb->gpioWr(nValue);
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}
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/** @brief Read the value from a GPIO input pin
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* @param pin GPIO input pin on USB Host Shield to read
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* @retval int Value of GPIO input (-1 on fail)
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*/
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int UHS2_GPIO::digitalRead(uint8_t pin) {
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if(pin > 7)
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return -1;
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uint8_t nMask = 1 << pin;
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uint8_t nValue = m_pUsb->gpioRd();
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return ((nValue & nMask)?1:0);
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}
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/** @brief Read the value from a GPIO output pin
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* @param pin GPIO output pin on USB Host Shield to read
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* @retval int Value of GPIO output (-1 on fail)
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* @note Value of MAX3421E output register, i.e. what the device has been set to, not the physical value on the pin
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*/
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int UHS2_GPIO::digitalReadOutput(uint8_t pin) {
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if(pin > 7)
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return -1;
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uint8_t nMask = 1 << pin;
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uint8_t nValue = m_pUsb->gpioRdOutput();
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return ((nValue & nMask)?1:0);
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}
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