Diff: UHS2_gpio.cpp

Revision:

0:84353c479782

Child:

1:2263e77400e9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/UHS2_gpio.cpp	Sun Jul 12 20:39:26 2020 +0000
@@ -0,0 +1,74 @@
+/* Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+Contact information
+-------------------
+
+Circuits At Home, LTD
+Web      :  http://www.circuitsathome.com
+e-mail   :  support@circuitsathome.com
+
+UHS2_GPIO implements "wiring" style GPIO access. Implemented by Brian Walton brian@riban.co.uk
+ */
+
+#include "UHS2_gpio.h"
+
+/** @brief  Implement an instance of a UHS2_GPIO object
+*   @param  pUSB Pointer to a UHS2 USB object
+*/
+UHS2_GPIO::UHS2_GPIO(USB *pUsb) : m_pUsb(pUsb)
+{
+}
+
+/** @brief  Set a GPIO output value
+*   @param  pin GPIO output pin on USB Host Shield to set
+*   @param  val Value to set the pin to (zero value will clear output, non-zero value will assert output)
+*/
+void UHS2_GPIO::digitalWrite(uint8_t pin, uint8_t val) {
+        if(pin > 7)
+                return;
+        uint8_t nValue = m_pUsb->gpioRdOutput();
+        uint8_t nMask = 1 << pin;
+        nValue &= (~nMask);
+        if(val)
+                nValue |= (nMask);
+        m_pUsb->gpioWr(nValue);
+}
+
+/** @brief  Read the value from a GPIO input pin
+*   @param  pin GPIO input pin on USB Host Shield to read
+*   @retval int Value of GPIO input (-1 on fail)
+*/
+int UHS2_GPIO::digitalRead(uint8_t pin) {
+        if(pin > 7)
+                return -1;
+        uint8_t nMask = 1 << pin;
+        uint8_t nValue = m_pUsb->gpioRd();
+        return ((nValue & nMask)?1:0);
+}
+
+/** @brief  Read the value from a GPIO output pin
+*   @param  pin GPIO output pin on USB Host Shield to read
+*   @retval int Value of GPIO output (-1 on fail)
+*   @note   Value of MAX3421E output register, i.e. what the device has been set to, not the physical value on the pin
+*/
+int UHS2_GPIO::digitalReadOutput(uint8_t pin) {
+        if(pin > 7)
+                return -1;
+        uint8_t nMask = 1 << pin;
+        uint8_t nValue = m_pUsb->gpioRdOutput();
+        return ((nValue & nMask)?1:0);
+}