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+/*
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+ * sn3218.c:
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+ * Extend wiringPi with the SN3218 I2C LEd Driver
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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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+
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+#include <wiringPi.h>
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+#include <wiringPiI2C.h>
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+
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+#include "sn3218.h"
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+
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+/*
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+ * myAnalogWrite:
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+ * Write analog value on the given pin
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+ *********************************************************************************
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+ */
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+
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+static void myAnalogWrite (struct wiringPiNodeStruct *node, int pin, int value)
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+{
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+ int fd = node->fd ;
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+ int chan = 0x01 + (pin - node->pinBase) ;
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+
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+ wiringPiI2CWriteReg8 (fd, chan, value & 0xFF) ; // Value
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+ wiringPiI2CWriteReg8 (fd, 0x16, 0x00) ; // Update
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+}
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+
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+/*
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+ * sn3218Setup:
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+ * Create a new wiringPi device node for an sn3218 on the Pi's
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+ * SPI interface.
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+ *********************************************************************************
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+ */
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+
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+int sn3218Setup (const int pinBase)
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+{
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+ int fd ;
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+ struct wiringPiNodeStruct *node ;
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+
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+ if ((fd = wiringPiI2CSetup (0x54)) < 0)
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+ return fd ;
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+
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+// Setup the chip - initialise all 18 LEDs to off
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+
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+//wiringPiI2CWriteReg8 (fd, 0x17, 0) ; // Reset
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+ wiringPiI2CWriteReg8 (fd, 0x00, 1) ; // Not Shutdown
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+ wiringPiI2CWriteReg8 (fd, 0x13, 0x3F) ; // Enable LEDs 0- 5
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+ wiringPiI2CWriteReg8 (fd, 0x14, 0x3F) ; // Enable LEDs 6-11
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+ wiringPiI2CWriteReg8 (fd, 0x15, 0x3F) ; // Enable LEDs 12-17
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+ wiringPiI2CWriteReg8 (fd, 0x16, 0x00) ; // Update
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+
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+ node = wiringPiNewNode (pinBase, 18) ;
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+
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+ node->fd = fd ;
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+ node->analogWrite = myAnalogWrite ;
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+
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+ return 0 ;
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+}
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