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77 lines
1.5 KiB
C
77 lines
1.5 KiB
C
/*
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* Copyright (C) 2015 Engineering-Spirit
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup cpu_stm32f2
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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 Nick v. IJzendoorn <nijzendoorn@engineering-spirit.nl>
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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/dac.h"
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#include "periph_conf.h"
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/* guard in case that no DAC device is defined */
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#if DAC_NUMOF
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/**
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* @brief Get the DAC configuration from the board (if configured)
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* @{
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*/
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#ifdef DAC_CONFIG
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static const dac_conf_t dac_config[] = DAC_CONFIG;
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#else
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static const dac_conf_t dac_config[] = {};
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#endif
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/** @} */
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int8_t dac_init(dac_t line)
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{
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if (line >= DAC_NUMOF) {
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return -1;
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}
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/* configure pin */
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gpio_init_analog(dac_config[line].pin);
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/* enable the DAC's clock */
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periph_clk_en(APB1, RCC_APB1ENR_DACEN);
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/* reset output and enable the line's channel */
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dac_set(line, 0);
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dac_poweron(line);
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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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value = (value >> 4); /* scale to 12-bit */
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if (dac_config[line].chan) {
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DAC->DHR12R2 = value;
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}
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else {
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DAC->DHR12R1 = value;
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}
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}
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void dac_poweron(dac_t line)
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{
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DAC->CR |= (1 << (16 * dac_config[line].chan));
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}
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void dac_poweroff(dac_t line)
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{
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DAC->CR &= ~(1 << (16 * dac_config[line].chan));
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}
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#endif /* DAC_NUMOF */
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