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75 lines
2.3 KiB
75 lines
2.3 KiB
/* |
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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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