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108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
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* Copyright (C) 2016-2017 Bas Stottelaar <basstottelaar@gmail.com>
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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_efm32
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* @ingroup drivers_periph_dac
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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 Bas Stottelaar <basstottelaar@gmail.com>
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*
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* @}
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*/
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#include "cpu.h"
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#include "macros/units.h"
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#include "periph_conf.h"
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#include "periph/dac.h"
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#include "em_cmu.h"
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#if defined(DAC_COUNT) && DAC_COUNT > 0
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#include "em_dac.h"
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#elif defined(VDAC_COUNT) && VDAC_COUNT > 0
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#include "em_vdac.h"
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#endif
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/* DAC implementation can be used for VDAC by mapping the symbols */
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#if defined(VDAC_COUNT) && VDAC_COUNT > 0
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#define DAC_INIT_DEFAULT VDAC_INIT_DEFAULT
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#define DAC_INITCHANNEL_DEFAULT VDAC_INITCHANNEL_DEFAULT
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#define DAC_Init_TypeDef VDAC_Init_TypeDef
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#define DAC_InitChannel_TypeDef VDAC_InitChannel_TypeDef
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#define DAC_Reset VDAC_Reset
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#define DAC_Init VDAC_Init
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#define DAC_InitChannel VDAC_InitChannel
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#define DAC_ChannelOutputSet VDAC_ChannelOutputSet
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#endif
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int8_t dac_init(dac_t line)
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{
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/* check if device is valid */
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if (line >= DAC_NUMOF) {
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return -1;
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}
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uint8_t dev = dac_channel_config[line].dev;
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/* enable clock */
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CMU_ClockEnable(cmuClock_HFPER, true);
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CMU_ClockEnable(dac_config[dev].cmu, true);
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/* reset and initialize peripheral */
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DAC_Init_TypeDef init = DAC_INIT_DEFAULT;
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#if defined(VDAC_COUNT)
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init.reference = dac_config[dev].ref;
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init.prescaler = VDAC_PrescaleCalc(MHZ(1000000), true, 0);
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#endif
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DAC_Reset(dac_config[dev].dev);
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DAC_Init(dac_config[dev].dev, &init);
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/* initialize channel */
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DAC_InitChannel_TypeDef init_channel = DAC_INITCHANNEL_DEFAULT;
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init_channel.enable = true;
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DAC_InitChannel(dac_config[dev].dev,
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&init_channel,
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dac_channel_config[line].index);
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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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uint8_t dev = dac_channel_config[line].dev;
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DAC_ChannelOutputSet(dac_config[dev].dev,
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dac_channel_config[line].index,
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value >> 4);
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}
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void dac_poweron(dac_t line)
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{
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uint8_t dev = dac_channel_config[line].dev;
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CMU_ClockEnable(dac_config[dev].cmu, true);
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}
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void dac_poweroff(dac_t line)
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{
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uint8_t dev = dac_channel_config[line].dev;
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CMU_ClockEnable(dac_config[dev].cmu, false);
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}
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