Zoltan Hudak / UsbHostMAX3421E

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Dependents:   UsbHostMAX3421E_Hello

UHS2_gpio.cpp@0:84353c479782, 2020-07-12 (annotated)

Committer:
hudakz
Date:
Sun Jul 12 20:39:26 2020 +0000
Revision:
0:84353c479782
Child:
1:2263e77400e9
MAX3421E-based USB Host Shield Library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hudakz 0:84353c479782 1 /* Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
hudakz 0:84353c479782 2
hudakz 0:84353c479782 3 This program is free software; you can redistribute it and/or modify
hudakz 0:84353c479782 4 it under the terms of the GNU General Public License as published by
hudakz 0:84353c479782 5 the Free Software Foundation; either version 2 of the License, or
hudakz 0:84353c479782 6 (at your option) any later version.
hudakz 0:84353c479782 7
hudakz 0:84353c479782 8 This program is distributed in the hope that it will be useful,
hudakz 0:84353c479782 9 but WITHOUT ANY WARRANTY; without even the implied warranty of
hudakz 0:84353c479782 10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
hudakz 0:84353c479782 11 GNU General Public License for more details.
hudakz 0:84353c479782 12
hudakz 0:84353c479782 13 You should have received a copy of the GNU General Public License
hudakz 0:84353c479782 14 along with this program; if not, write to the Free Software
hudakz 0:84353c479782 15 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
hudakz 0:84353c479782 16
hudakz 0:84353c479782 17 Contact information
hudakz 0:84353c479782 18 -------------------
hudakz 0:84353c479782 19
hudakz 0:84353c479782 20 Circuits At Home, LTD
hudakz 0:84353c479782 21 Web : http://www.circuitsathome.com
hudakz 0:84353c479782 22 e-mail : support@circuitsathome.com
hudakz 0:84353c479782 23
hudakz 0:84353c479782 24 UHS2_GPIO implements "wiring" style GPIO access. Implemented by Brian Walton brian@riban.co.uk
hudakz 0:84353c479782 25 */
hudakz 0:84353c479782 26
hudakz 0:84353c479782 27 #include "UHS2_gpio.h"
hudakz 0:84353c479782 28
hudakz 0:84353c479782 29 /** @brief Implement an instance of a UHS2_GPIO object
hudakz 0:84353c479782 30 * @param pUSB Pointer to a UHS2 USB object
hudakz 0:84353c479782 31 */
hudakz 0:84353c479782 32 UHS2_GPIO::UHS2_GPIO(USB *pUsb) : m_pUsb(pUsb)
hudakz 0:84353c479782 33 {
hudakz 0:84353c479782 34 }
hudakz 0:84353c479782 35
hudakz 0:84353c479782 36 /** @brief Set a GPIO output value
hudakz 0:84353c479782 37 * @param pin GPIO output pin on USB Host Shield to set
hudakz 0:84353c479782 38 * @param val Value to set the pin to (zero value will clear output, non-zero value will assert output)
hudakz 0:84353c479782 39 */
hudakz 0:84353c479782 40 void UHS2_GPIO::digitalWrite(uint8_t pin, uint8_t val) {
hudakz 0:84353c479782 41 if(pin > 7)
hudakz 0:84353c479782 42 return;
hudakz 0:84353c479782 43 uint8_t nValue = m_pUsb->gpioRdOutput();
hudakz 0:84353c479782 44 uint8_t nMask = 1 << pin;
hudakz 0:84353c479782 45 nValue &= (~nMask);
hudakz 0:84353c479782 46 if(val)
hudakz 0:84353c479782 47 nValue |= (nMask);
hudakz 0:84353c479782 48 m_pUsb->gpioWr(nValue);
hudakz 0:84353c479782 49 }
hudakz 0:84353c479782 50
hudakz 0:84353c479782 51 /** @brief Read the value from a GPIO input pin
hudakz 0:84353c479782 52 * @param pin GPIO input pin on USB Host Shield to read
hudakz 0:84353c479782 53 * @retval int Value of GPIO input (-1 on fail)
hudakz 0:84353c479782 54 */
hudakz 0:84353c479782 55 int UHS2_GPIO::digitalRead(uint8_t pin) {
hudakz 0:84353c479782 56 if(pin > 7)
hudakz 0:84353c479782 57 return -1;
hudakz 0:84353c479782 58 uint8_t nMask = 1 << pin;
hudakz 0:84353c479782 59 uint8_t nValue = m_pUsb->gpioRd();
hudakz 0:84353c479782 60 return ((nValue & nMask)?1:0);
hudakz 0:84353c479782 61 }
hudakz 0:84353c479782 62
hudakz 0:84353c479782 63 /** @brief Read the value from a GPIO output pin
hudakz 0:84353c479782 64 * @param pin GPIO output pin on USB Host Shield to read
hudakz 0:84353c479782 65 * @retval int Value of GPIO output (-1 on fail)
hudakz 0:84353c479782 66 * @note Value of MAX3421E output register, i.e. what the device has been set to, not the physical value on the pin
hudakz 0:84353c479782 67 */
hudakz 0:84353c479782 68 int UHS2_GPIO::digitalReadOutput(uint8_t pin) {
hudakz 0:84353c479782 69 if(pin > 7)
hudakz 0:84353c479782 70 return -1;
hudakz 0:84353c479782 71 uint8_t nMask = 1 << pin;
hudakz 0:84353c479782 72 uint8_t nValue = m_pUsb->gpioRdOutput();
hudakz 0:84353c479782 73 return ((nValue & nMask)?1:0);
hudakz 0:84353c479782 74 }