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80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
/*
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* Copyright (C) 2017 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_sam3
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* @{
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*
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* @file
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* @brief Low-level DAC driver implementation
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*
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* @}
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*/
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#include "cpu.h"
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#include "assert.h"
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#include "periph/dac.h"
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#define WP_KEY (0x444143)
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#define PMC_BIT (1 << (ID_DACC - 32))
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#ifndef DAC_STARTUP
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#define DAC_STARTUP (DACC_MR_STARTUP_1984)
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#endif
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#ifndef DAC_REFRESH
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#define DAC_REFRESH (DACC_MR_REFRESH(128))
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#endif
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int8_t dac_init(dac_t line)
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{
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assert(line < DAC_NUMOF);
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/* power on DACC peripheral */
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PMC->PMC_PCER1 = PMC_BIT;
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/* unlock DACC registers */
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DACC->DACC_WPMR = DACC_WPMR_WPKEY(WP_KEY);
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/* configure mode register */
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DACC->DACC_MR = (DAC_STARTUP | DACC_MR_TAG_EN | DAC_REFRESH);
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/* enable the selected channel/line */
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DACC->DACC_CHER = (1 << line);
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/* set line initially to 0 volts -> this will startup the channel and the
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* channel is ready after the defined number of startup cycles
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* (DAC_STARTUP) have passed */
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dac_set(line, 0);
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return 0;
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}
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void dac_set(dac_t line, uint16_t value)
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{
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assert(line < DAC_NUMOF);
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DACC->DACC_CDR = ((value >> 4) | (line << 12));
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}
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void dac_poweron(dac_t line)
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{
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assert(line < DAC_NUMOF);
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PMC->PMC_PCER1 = PMC_BIT;
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DACC->DACC_CHER = (1 << line);
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}
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void dac_poweroff(dac_t line)
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{
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assert(line < DAC_NUMOF);
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DACC->DACC_CHDR = (1 << line);
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if (!(DACC->DACC_CHSR)) {
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PMC->PMC_PCDR1 = PMC_BIT;
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}
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}
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