sn3218.c
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/*
* sn3218.c:
* Extend wiringPi with the SN3218 I2C LEd Driver
* Copyright (c) 2012-2013 Gordon Henderson
***********************************************************************
* 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 <wiringPi.h>
#include <wiringPiI2C.h>
#include "sn3218.h"
/*
* myAnalogWrite:
* Write analog value on the given pin
*********************************************************************************
*/
static void myAnalogWrite (struct wiringPiNodeStruct *node, int pin, int value)
{
int fd = node->fd ;
int chan = 0x01 + (pin - node->pinBase) ;
wiringPiI2CWriteReg8 (fd, chan, value & 0xFF) ; // Value
wiringPiI2CWriteReg8 (fd, 0x16, 0x00) ; // Update
}
/*
* sn3218Setup:
* Create a new wiringPi device node for an sn3218 on the Pi's
* SPI interface.
*********************************************************************************
*/
int sn3218Setup (const int pinBase)
{
int fd ;
struct wiringPiNodeStruct *node ;
if ((fd = wiringPiI2CSetup (0x54)) < 0)
return fd ;
// Setup the chip - initialise all 18 LEDs to off
//wiringPiI2CWriteReg8 (fd, 0x17, 0) ; // Reset
wiringPiI2CWriteReg8 (fd, 0x00, 1) ; // Not Shutdown
wiringPiI2CWriteReg8 (fd, 0x13, 0x3F) ; // Enable LEDs 0- 5
wiringPiI2CWriteReg8 (fd, 0x14, 0x3F) ; // Enable LEDs 6-11
wiringPiI2CWriteReg8 (fd, 0x15, 0x3F) ; // Enable LEDs 12-17
wiringPiI2CWriteReg8 (fd, 0x16, 0x00) ; // Update
node = wiringPiNewNode (pinBase, 18) ;
node->fd = fd ;
node->analogWrite = myAnalogWrite ;
return 0 ;
}