76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
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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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#include <wiringPi.h>
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#include <wiringPiI2C.h>
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#include "sn3218.h"
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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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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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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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* 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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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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if ((fd = wiringPiI2CSetup (0x54)) < 0)
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return FALSE ;
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// Setup the chip - initialise all 18 LEDs to off
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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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node = wiringPiNewNode (pinBase, 18) ;
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node->fd = fd ;
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node->analogWrite = myAnalogWrite ;
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return TRUE ;
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}
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