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817bb48843
The EFM32 MCU allows the reference voltage to be configured per DAC device, not per DAC channel. Also, the DAC reference voltage was defined in the configuration but not used anywhere.
86 lines
1.8 KiB
C
86 lines
1.8 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 "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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#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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init.reference = dac_config[dev].ref;
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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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