mirror of
https://github.com/RIOT-OS/RIOT.git
synced 2024-12-29 04:50:03 +01:00
84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
/*
|
|
* Copyright (C) 2016 Eistec AB
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU Lesser General
|
|
* Public License v2.1. See the file LICENSE in the top level directory for more
|
|
* details.
|
|
*/
|
|
|
|
/**
|
|
* @ingroup cpu_kinetis
|
|
* @ingroup drivers_periph_dac
|
|
*
|
|
* @{
|
|
*
|
|
* @file
|
|
* @brief Low-level DAC driver implementation
|
|
*
|
|
* This driver uses the 12-bit in-CPU DAC module. The 6-bit digital-to-analog
|
|
* converter inside the CMP module is _not_ used by this implementation.
|
|
*
|
|
* @author Joakim Nohlgård <joakim.nohlgard@eistec.se>
|
|
*
|
|
* @}
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "cpu.h"
|
|
#include "bit.h"
|
|
#include "assert.h"
|
|
#include "periph/dac.h"
|
|
#include "periph_conf.h"
|
|
|
|
static inline DAC_Type *dev(dac_t line)
|
|
{
|
|
return dac_config[line].dev;
|
|
}
|
|
|
|
int8_t dac_init(dac_t line)
|
|
{
|
|
if (line >= DAC_NUMOF) {
|
|
return DAC_NOLINE;
|
|
}
|
|
|
|
/* Enable module clock */
|
|
bit_set32(dac_config[line].scgc_addr, dac_config[line].scgc_bit);
|
|
/* Select VDDA as voltage reference */
|
|
dev(line)->C0 = (DAC_C0_DACRFS_MASK);
|
|
/* Disable DMA and buffering */
|
|
dev(line)->C1 = 0;
|
|
dev(line)->C2 = 0;
|
|
/* Enable the device */
|
|
bit_set8(&dac_config[line].dev->C0, DAC_C0_DACEN_SHIFT);
|
|
/* Set output value to zero */
|
|
dac_set(line, 0);
|
|
|
|
return DAC_OK;
|
|
}
|
|
|
|
void dac_set(dac_t line, uint16_t value)
|
|
{
|
|
assert(line < DAC_NUMOF);
|
|
|
|
/* Scale to 12 bit */
|
|
value = (value >> 4);
|
|
|
|
dev(line)->DAT[0].DATH = ((value >> 8) & 0xff);
|
|
dev(line)->DAT[0].DATL = (value & 0xff);
|
|
}
|
|
|
|
void dac_poweron(dac_t line)
|
|
{
|
|
assert(line < DAC_NUMOF);
|
|
|
|
bit_set8(&dac_config[line].dev->C0, DAC_C0_DACEN_SHIFT);
|
|
}
|
|
|
|
void dac_poweroff(dac_t line)
|
|
{
|
|
assert(line < DAC_NUMOF);
|
|
|
|
bit_clear8(&dac_config[line].dev->C0, DAC_C0_DACEN_SHIFT);
|
|
}
|