Git-Mirrors/OpenModem
1
0
Fork 0
mirror of https://github.com/markqvist/OpenModem.git synced 2025-07-31 02:48:40 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Working

Browse source
This commit is contained in:
Mark Qvist 2014-04-03 22:21:37 +02:00
commit c898b090dd
1049 changed files with 288572 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

79
bertos/drv/mcp41.c Normal file
View file

@ -0,0 +1,79 @@
/**
* \file
* <!--
* This file is part of BeRTOS.
*
* Bertos is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As a special exception, you may use this file as part of a free software
* library without restriction. Specifically, if other files instantiate
* templates or use macros or inline functions from this file, or you compile
* this file and link it with other files to produce an executable, this
* file does not by itself cause the resulting executable to be covered by
* the GNU General Public License. This exception does not however
* invalidate any other reasons why the executable file might be covered by
* the GNU General Public License.
*
* Copyright 2005 Develer S.r.l. (http://www.develer.com/)
* -->
*
*
* \brief MCP41xxx digital potentiomenter driver (implementation)
*
* \author Francesco Sacchi <batt@develer.com>
*/
#include "hw/hw_mcp41.h"
#include <cfg/macros.h>
#include <cfg/compiler.h>
#include <drv/timer.h>
#include <drv/mcp41.h>
#include <io/kfile.h>
static KFile *ch;
/**
* Set resitance for digital pot \a dev
*/
void mcp41_setResistance(Mcp41Dev dev, mcp41_res_t res)
{
MCP41_ON(dev);
/* send command byte */
kfile_putc(MCP41_WRITE_DATA, ch);
kfile_putc(((MCP41_HW_MAX * (uint32_t)res) + (MCP41_MAX / 2)) / MCP41_MAX, ch);
kfile_flush(ch);
MCP41_OFF(dev);
}
/**
* Initialize mcp41 potentiometer driver
*/
void mcp41_init(KFile *_ch)
{
Mcp41Dev dev;
/* Init all potentiometer ports */
for (dev = 0; dev < MCP41_CNT; dev++)
{
SET_MCP41_DDR(dev);
MCP41_OFF(dev);
}
ch = _ch;
}