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https://github.com/RIOT-OS/RIOT.git
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3c623f63c3
- use assert() for checking the line parameter - use 'bit.h' for bitbanding - simplified code a bit - unified style of defifining the board configuration - removed unused configurations form pba-d-01-kw2x and frdm-k64f
89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
/*
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* Copyright (C) 2016 Eistec AB
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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_kinetis_common
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* @ingroup drivers_periph_dac
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*
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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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* This driver uses the 12-bit in-CPU DAC module. The 6-bit digital-to-analog
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* converter inside the CMP module is _not_ used by this implementation.
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*
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* @author Joakim Nohlgård <joakim.nohlgard@eistec.se>
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*
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* @}
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*/
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#include <stdint.h>
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#include "cpu.h"
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#include "bit.h"
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#include "assert.h"
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#include "periph/dac.h"
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#include "periph_conf.h"
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/* only compile this file if there are DAC lines defined */
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#ifdef DAC_NUMOF
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static inline DAC_Type *dev(dac_t line)
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{
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return dac_config[line].dev;
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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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/* Enable module clock */
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bit_set32(dac_config[line].scgc_addr, dac_config[line].scgc_bit);
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/* Select VDDA as voltage reference */
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dev(line)->C0 = (DAC_C0_DACRFS_MASK);
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/* Disable DMA and buffering */
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dev(line)->C1 = 0;
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dev(line)->C2 = 0;
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/* Enable the device */
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bit_set8(&dac_config[line].dev->C0, DAC_C0_DACEN_SHIFT);
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/* Set output value to zero */
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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 to 12 bit */
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value = (value >> 4);
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dev(line)->DAT[0].DATH = ((value >> 8) & 0xff);
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dev(line)->DAT[0].DATL = (value & 0xff);
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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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bit_set8(&dac_config[line].dev->C0, DAC_C0_DACEN_SHIFT);
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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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bit_clear8(&dac_config[line].dev->C0, DAC_C0_DACEN_SHIFT);
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}
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#endif /* DAC_NUMOF */
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