|
@@ -1,178 +0,0 @@
|
|
|
-/*
|
|
|
- * piFace.:
|
|
|
- * Arduino compatable (ish) Wiring library for the Raspberry Pi
|
|
|
- * Copyright (c) 2012-2013 Gordon Henderson
|
|
|
- *
|
|
|
- * This file to interface with the PiFace peripheral device which
|
|
|
- * has an MCP23S17 GPIO device connected via the SPI bus.
|
|
|
- ***********************************************************************
|
|
|
- * This file is part of wiringPi:
|
|
|
- * https://projects.drogon.net/raspberry-pi/wiringpi/
|
|
|
- *
|
|
|
- * wiringPi is free software: you can redistribute it and/or modify
|
|
|
- * it under the terms of the GNU Lesser General Public License as
|
|
|
- * published by the Free Software Foundation, either version 3 of the
|
|
|
- * License, or (at your option) any later version.
|
|
|
- *
|
|
|
- * wiringPi 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 Lesser General Public License for more details.
|
|
|
- *
|
|
|
- * You should have received a copy of the GNU Lesser General Public
|
|
|
- * License along with wiringPi.
|
|
|
- * If not, see <http://www.gnu.org/licenses/>.
|
|
|
- ***********************************************************************
|
|
|
- */
|
|
|
-
|
|
|
-
|
|
|
-#include <stdio.h>
|
|
|
-#include <stdint.h>
|
|
|
-
|
|
|
-#include <wiringPi.h>
|
|
|
-#include <wiringPiSPI.h>
|
|
|
-
|
|
|
-#include "../wiringPi/mcp23x0817.h"
|
|
|
-
|
|
|
-#include "piFace.h"
|
|
|
-
|
|
|
-#define PIFACE_SPEED 4000000
|
|
|
-#define PIFACE_DEVNO 0
|
|
|
-
|
|
|
-
|
|
|
-
|
|
|
-/*
|
|
|
- * writeByte:
|
|
|
- * Write a byte to a register on the MCP23S17 on the SPI bus.
|
|
|
- *********************************************************************************
|
|
|
- */
|
|
|
-
|
|
|
-static void writeByte (uint8_t reg, uint8_t data)
|
|
|
-{
|
|
|
- uint8_t spiData [4] ;
|
|
|
-
|
|
|
- spiData [0] = CMD_WRITE ;
|
|
|
- spiData [1] = reg ;
|
|
|
- spiData [2] = data ;
|
|
|
-
|
|
|
- wiringPiSPIDataRW (PIFACE_DEVNO, spiData, 3) ;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * readByte:
|
|
|
- * Read a byte from a register on the MCP23S17 on the SPI bus.
|
|
|
- *********************************************************************************
|
|
|
- */
|
|
|
-
|
|
|
-static uint8_t readByte (uint8_t reg)
|
|
|
-{
|
|
|
- uint8_t spiData [4] ;
|
|
|
-
|
|
|
- spiData [0] = CMD_READ ;
|
|
|
- spiData [1] = reg ;
|
|
|
-
|
|
|
- wiringPiSPIDataRW (PIFACE_DEVNO, spiData, 3) ;
|
|
|
-
|
|
|
- return spiData [2] ;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-/*
|
|
|
- * myDigitalWrite:
|
|
|
- * Perform the digitalWrite function on the PiFace board
|
|
|
- *********************************************************************************
|
|
|
- */
|
|
|
-
|
|
|
-void myDigitalWrite (struct wiringPiNodeStruct *node, int pin, int value)
|
|
|
-{
|
|
|
- uint8_t mask, old ;
|
|
|
-
|
|
|
- pin -= node->pinBase ;
|
|
|
- mask = 1 << pin ;
|
|
|
- old = readByte (MCP23x17_GPIOA) ;
|
|
|
-
|
|
|
- if (value == 0)
|
|
|
- old &= (~mask) ;
|
|
|
- else
|
|
|
- old |= mask ;
|
|
|
-
|
|
|
- writeByte (MCP23x17_GPIOA, old) ;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-/*
|
|
|
- * myDigitalRead:
|
|
|
- * Perform the digitalRead function on the PiFace board
|
|
|
- *********************************************************************************
|
|
|
- */
|
|
|
-
|
|
|
-int myDigitalRead (struct wiringPiNodeStruct *node, int pin)
|
|
|
-{
|
|
|
- uint8_t mask, reg ;
|
|
|
-
|
|
|
- mask = 1 << ((pin - node->pinBase) & 7) ;
|
|
|
-
|
|
|
- if (pin < 8)
|
|
|
- reg = MCP23x17_GPIOB ; // Input regsiter
|
|
|
- else
|
|
|
- reg = MCP23x17_OLATA ; // Output latch regsiter
|
|
|
-
|
|
|
- if ((readByte (reg) & mask) != 0)
|
|
|
- return HIGH ;
|
|
|
- else
|
|
|
- return LOW ;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-/*
|
|
|
- * myPullUpDnControl:
|
|
|
- * Perform the pullUpDnControl function on the PiFace board
|
|
|
- *********************************************************************************
|
|
|
- */
|
|
|
-
|
|
|
-void myPullUpDnControl (struct wiringPiNodeStruct *node, int pin, int pud)
|
|
|
-{
|
|
|
- uint8_t mask, old ;
|
|
|
-
|
|
|
- mask = 1 << (pin - node->pinBase) ;
|
|
|
- old = readByte (MCP23x17_GPPUB) ;
|
|
|
-
|
|
|
- if (pud == 0)
|
|
|
- old &= (~mask) ;
|
|
|
- else
|
|
|
- old |= mask ;
|
|
|
-
|
|
|
- writeByte (MCP23x17_GPPUB, old) ;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-/*
|
|
|
- * piFaceSetup
|
|
|
- * Setup the SPI interface and initialise the MCP23S17 chip
|
|
|
- * We create one node with 16 pins - each if the first 8 pins being read
|
|
|
- * and write - although the operations actually go to different
|
|
|
- * hardware ports. The top 8 let you read the state of the output register.
|
|
|
- *********************************************************************************
|
|
|
- */
|
|
|
-
|
|
|
-int piFaceSetup (const int pinBase)
|
|
|
-{
|
|
|
- int x ;
|
|
|
- struct wiringPiNodeStruct *node ;
|
|
|
-
|
|
|
- if ((x = wiringPiSPISetup (PIFACE_DEVNO, PIFACE_SPEED)) < 0)
|
|
|
- return x ;
|
|
|
-
|
|
|
-// Setup the MCP23S17
|
|
|
-
|
|
|
- writeByte (MCP23x17_IOCON, IOCON_INIT) ;
|
|
|
- writeByte (MCP23x17_IODIRA, 0x00) ; // Port A -> Outputs
|
|
|
- writeByte (MCP23x17_IODIRB, 0xFF) ; // Port B -> Inputs
|
|
|
-
|
|
|
- node = wiringPiNewNode (pinBase, 16) ;
|
|
|
- node->digitalRead = myDigitalRead ;
|
|
|
- node->digitalWrite = myDigitalWrite ;
|
|
|
- node->pullUpDnControl = myPullUpDnControl ;
|
|
|
-
|
|
|
- return 0 ;
|
|
|
-}
|