3 * Access routines for the SPI devices on the Gertboard
4 * Copyright (c) 2012 Gordon Henderson
6 * The Gertboard has an MCP4802 dual-channel D to A convertor
7 * connected to the SPI bus, selected via chip-select B.
9 ***********************************************************************
10 * This file is part of wiringPi:
11 * https://projects.drogon.net/raspberry-pi/wiringpi/
13 * wiringPi is free software: you can redistribute it and/or modify
14 * it under the terms of the GNU Lesser General Public License as
15 * published by the Free Software Foundation, either version 3 of the
16 * License, or (at your option) any later version.
18 * wiringPi is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU Lesser General Public License for more details.
23 * You should have received a copy of the GNU Lesser General Public
24 * License along with wiringPi.
25 * If not, see <http://www.gnu.org/licenses/>.
26 ***********************************************************************
35 extern void gertboardAnalogWrite (const int chan, const int value) ;
36 extern int gertboardAnalogRead (const int chan) ;
37 extern int gertboardSPISetup (void) ;
41 extern int gertboardAnalogSetup (const int pinBase) ;