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/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 Bryan Newbold.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*****************************************************************************/
#include "libmaple.h"
#include "rcc.h"
#include "gpio.h"
#include "dac.h"
/* Only one, so global to this file */
DAC_Map *dac = (DAC_Map*)(DAC_BASE);
/* This numbering follows the registers (1-indexed) */
#define DAC_CHA 1
#define DAC_CHB 2
/* Sets up the DAC peripheral */
void dac_init(void) {
/* First turn on the clock */
rcc_clk_enable(RCC_DAC);
/* Then setup ANALOG mode on PA4 and PA5 */
gpio_set_mode(GPIOA_BASE, 4, CNF_INPUT_ANALOG);
gpio_set_mode(GPIOA_BASE, 5, CNF_INPUT_ANALOG);
/* Then do register stuff. Default does no triggering, and
* buffered output, so all good. */
dac->CR |= DAC_CR_EN1;
dac->CR |= DAC_CR_EN2;
}
void dac_write(uint8 chan, uint16 val) {
switch(chan) {
case DAC_CHA:
dac->DHR12R1 = 0x0FFF & val;
break;
case DAC_CHB:
dac->DHR12R2 = 0x0FFF & val;
break;
default:
ASSERT(0); // can't happen
}
}
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