dac.c
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/*
* Copyright (C) 2014 Simon Brummer
* 2015-2016 Freie Universität Berlin
*
* 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_stm32_common
* @{
*
* @file
* @brief Low-level DAC driver implementation
*
* @author Simon Brummer <simon.brummer@haw-hamburg.de>
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*
* @}
*/
#include "cpu.h"
#include "periph/dac.h"
#include "periph_conf.h"
/* only compile this, if the CPU has a DAC */
#if (defined(DAC) || defined(DAC1)) && defined(DAC_CONFIG)
#ifdef DAC2
#define _DAC(line) (dac_config[line].dac ? DAC2 : DAC1)
#else
#define _DAC(line) DAC
#endif
/**
* @brief Get the DAC configuration from the board config
*/
static const dac_conf_t dac_config[] = DAC_CONFIG;
int8_t dac_init(dac_t line)
{
if (line >= DAC_NUMOF) {
return -1;
}
/* configure pin */
gpio_init_analog(dac_config[line].pin);
/* enable the DAC's clock */
#if defined(DAC2)
periph_clk_en(APB1, dac_config[line].dac ?
RCC_APB1ENR_DAC2EN : RCC_APB1ENR_DAC1EN);
#elif defined(DAC1)
periph_clk_en(APB1, RCC_APB1ENR_DAC1EN);
#else
periph_clk_en(APB1, RCC_APB1ENR_DACEN);
#endif
/* reset output and enable the line's channel */
dac_set(line, 0);
dac_poweron(line);
return 0;
}
void dac_set(dac_t line, uint16_t value)
{
value = (value >> 4); /* scale to 12-bit */
#ifdef DAC_DHR12R2_DACC2DHR
if (dac_config[line].chan) {
_DAC(line)->DHR12R2 = value;
}
else {
_DAC(line)->DHR12R1 = value;
}
#else
(void) line;
_DAC(line)->DHR12R1 = value;
#endif
}
void dac_poweron(dac_t line)
{
DAC->CR |= (1 << (16 * dac_config[line].chan));
}
void dac_poweroff(dac_t line)
{
DAC->CR &= ~(1 << (16 * dac_config[line].chan));
}
#else
typedef int dont_be_pedantic;
#endif /* DAC */