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112 lines
3.2 KiB
112 lines
3.2 KiB
/* |
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* piFace.: |
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* This file to interface with the PiFace peripheral device which |
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* has an MCP23S17 GPIO device connected via the SPI bus. |
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* |
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* Copyright (c) 2012-2013 Gordon Henderson |
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*********************************************************************** |
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* This file is part of wiringPi: |
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* https://projects.drogon.net/raspberry-pi/wiringpi/ |
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* |
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* wiringPi is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as |
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* published by the Free Software Foundation, either version 3 of the |
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* License, or (at your option) any later version. |
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* |
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* wiringPi 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 Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with wiringPi. |
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* If not, see <http://www.gnu.org/licenses/>. |
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*********************************************************************** |
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*/ |
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#include <stdio.h> |
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#include <stdint.h> |
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#include <wiringPi.h> |
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#include <mcp23s17.h> |
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#include "piFace.h" |
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/* |
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* myDigitalWrite: |
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* Perform the digitalWrite function on the PiFace board |
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********************************************************************************* |
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*/ |
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void myDigitalWrite (struct wiringPiNodeStruct *node, int pin, int value) |
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{ |
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digitalWrite (pin + 16, value) ; |
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} |
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/* |
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* myDigitalRead: |
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* Perform the digitalRead function on the PiFace board |
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* With a slight twist - if we read from base + 8, then we |
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* read from the output latch... |
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********************************************************************************* |
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*/ |
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int myDigitalRead (struct wiringPiNodeStruct *node, int pin) |
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{ |
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if ((pin - node->pinBase) >= 8) |
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return digitalRead (pin + 8) ; |
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else |
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return digitalRead (pin + 16 + 8) ; |
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} |
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/* |
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* myPullUpDnControl: |
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* Perform the pullUpDnControl function on the PiFace board |
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********************************************************************************* |
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*/ |
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void myPullUpDnControl (struct wiringPiNodeStruct *node, int pin, int pud) |
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{ |
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pullUpDnControl (pin + 16 + 8, pud) ; |
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} |
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/* |
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* piFaceSetup |
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* We're going to create an instance of the mcp23s17 here, then |
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* provide our own read/write routines on-top of it... |
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* The supplied PiFace code (in Pithon) treats it as an 8-bit device |
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* where you write the output ports and read the input port using the |
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* same pin numbers, however I have had a request to be able to read |
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* the output port, so reading 8..15 will read the output latch. |
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********************************************************************************* |
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*/ |
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int piFaceSetup (const int pinBase) |
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{ |
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int i ; |
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struct wiringPiNodeStruct *node ; |
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// Create an mcp23s17 instance: |
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mcp23s17Setup (pinBase + 16, 0, 0) ; |
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// Set the direction bits |
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for (i = 0 ; i < 8 ; ++i) |
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{ |
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pinMode (pinBase + 16 + i, OUTPUT) ; // Port A is the outputs |
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pinMode (pinBase + 16 + 8 + i, INPUT) ; // Port B inputs. |
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} |
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node = wiringPiNewNode (pinBase, 16) ; |
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node->digitalRead = myDigitalRead ; |
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node->digitalWrite = myDigitalWrite ; |
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node->pullUpDnControl = myPullUpDnControl ; |
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return 0 ; |
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}
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