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124 lines
2.6 KiB
C
124 lines
2.6 KiB
C
/*
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* Copyright (C) 2014 Simon Brummer
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* 2015-2016 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_stm32
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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 Simon Brummer <simon.brummer@haw-hamburg.de>
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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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/* DAC channel enable bits */
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#ifdef DAC_CR_EN2
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#define EN_MASK (DAC_CR_EN1 | DAC_CR_EN2)
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#else
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#define EN_MASK (DAC_CR_EN1)
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#endif
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/* get RCC bit */
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#ifdef RCC_APB1ENR_DAC1EN
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#define RCC_BIT (RCC_APB1ENR_DAC1EN)
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#else
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#define RCC_BIT (RCC_APB1ENR_DACEN)
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#endif
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/* deduct DAC device from given line channel */
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static inline DAC_TypeDef *dev(dac_t line)
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{
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#if defined(DAC2)
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return (dac_config[line].chan > 1) ? DAC2 : DAC1;
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#elif defined (DAC1)
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(void) line;
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return DAC1;
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#else
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(void) line;
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return DAC;
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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 DAC_NOLINE;
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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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/* reset output and enable the line's channel */
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dac_poweron(line);
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dac_set(line, 0);
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return DAC_OK;
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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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/* scale set value to 12-bit */
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value = (value >> 4);
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#ifdef DAC_DHR12R2_DACC2DHR
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if (dac_config[line].chan & 0x01) {
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dev(line)->DHR12R2 = value;
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}
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else {
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dev(line)->DHR12R1 = value;
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}
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#else
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dev(line)->DHR12R1 = value;
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#endif
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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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/* enable the DAC's clock */
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#if defined(DAC2)
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periph_clk_en(APB1, (dac_config[line].chan > 1) ?
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RCC_APB1ENR_DAC2EN : RCC_APB1ENR_DAC1EN);
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#else
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periph_clk_en(APB1, RCC_BIT);
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#endif
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/* enable corresponding DAC channel */
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dev(line)->CR |= (1 << (16 * (dac_config[line].chan & 0x01)));
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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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/* disable corresponding channel */
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dev(line)->CR &= ~(1 << (16 * (dac_config[line].chan & 0x01)));
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/* disable the DAC's clock in case no channel is active anymore */
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if (!(dev(line)->CR & EN_MASK)) {
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#if defined(DAC2)
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periph_clk_dis(APB1, (dac_config[line].chan > 1) ?
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RCC_APB1ENR_DAC2EN : RCC_APB1ENR_DAC1EN);
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#else
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periph_clk_dis(APB1, RCC_BIT);
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#endif
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}
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}
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