105 lines
2.9 KiB
C
105 lines
2.9 KiB
C
/**
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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 2010 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \author Francesco Sacchi <batt@develer.com>
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*
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* Texas instrument TLV5618 DAC driver.
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*/
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#include "tlv5618.h"
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#include "hw/hw_tlv5618.h"
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#include <io/kfile.h>
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#include <string.h> //memset
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static void tlv5618_write(Tlv5618 *ctx, uint16_t val)
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{
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TLV5618_CSLOW(ctx->cs_pin);
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kfile_putc(val >> 8, ctx->ch);
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kfile_putc(val & 0xFF, ctx->ch);
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kfile_flush(ctx->ch);
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TLV5618_CSHIGH(ctx->cs_pin);
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}
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#define POWERDOWN 0x2000
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#define OUTA 0xC000
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#define OUTB 0x4000
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/**
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* Set DAC output A to \a val.
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* \a val ranges from 0 to 4095 (12 bit).
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* \note : if in power down, the device will be awaken.
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*/
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void tlv5618_setOutA(Tlv5618 *ctx, uint16_t val)
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{
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val &= 0x0FFF;
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tlv5618_write(ctx, val | OUTA);
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}
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/**
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* Set DAC output B to \a val.
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* \a val ranges from 0 to 4095 (12 bit).
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* \note : if in power down, the device will be awaken.
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*/
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void tlv5618_setOutB(Tlv5618 *ctx, uint16_t val)
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{
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val &= 0x0FFF;
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tlv5618_write(ctx, val | OUTB);
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}
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/**
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* Set the TLV5618 in the power down state.
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*/
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void tlv5618_setPowerDown(Tlv5618 *ctx)
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{
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tlv5618_write(ctx, POWERDOWN);
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}
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/**
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* Init the TLV5618 with CS connected to \a cs_pin.
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* \a ch should be the SPI channel needed to communicate with the DAC.
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* This SPI should also be correctly configured (the MOSI should
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* change on the rising edge of the SCK clock).
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* \note the device is set in power down mode.
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*/
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void tlv5618_init(Tlv5618 *ctx, KFile *ch, int cs_pin)
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{
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memset(ctx, 0, sizeof(*ctx));
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ctx->cs_pin = cs_pin;
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ctx->ch = ch;
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TLV5618_CSINIT(cs_pin);
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tlv5618_setPowerDown(ctx);
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}
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