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