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/******************************************************************************
* The MIT License
*
* Copyright (c) 2012 LeafLabs, LLC.
* Copyright (c) 2010 Perry Hung.
*
* 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.
*****************************************************************************/
/**
* @file libmaple/stm32f1/adc.c
* @author Marti Bolivar <mbolivar@leaflabs.com>,
* Perry Hung <perry@leaflabs.com>
* @brief STM32F1 ADC support.
*/
#include <libmaple/adc.h>
#include <libmaple/gpio.h>
/*
* Devices
*/
static adc_dev adc1 = {
.regs = ADC1_BASE,
.clk_id = RCC_ADC1,
};
/** ADC1 device. */
const adc_dev *ADC1 = &adc1;
static adc_dev adc2 = {
.regs = ADC2_BASE,
.clk_id = RCC_ADC2,
};
/** ADC2 device. */
const adc_dev *ADC2 = &adc2;
#if defined(STM32_HIGH_DENSITY) || defined(STM32_XL_DENSITY)
static adc_dev adc3 = {
.regs = ADC3_BASE,
.clk_id = RCC_ADC3,
};
/** ADC3 device. */
const adc_dev *ADC3 = &adc3;
#endif
/*
* STM32F1 routines
*/
/**
* @brief Calibrate an ADC peripheral
* @param dev adc device
*/
void adc_calibrate(const adc_dev *dev) {
__io uint32 *rstcal_bit = bb_perip(&(dev->regs->CR2), 3);
__io uint32 *cal_bit = bb_perip(&(dev->regs->CR2), 2);
*rstcal_bit = 1;
while (*rstcal_bit)
;
*cal_bit = 1;
while (*cal_bit)
;
}
/*
* Common routines
*/
void adc_set_prescaler(adc_prescaler pre) {
rcc_set_prescaler(RCC_PRESCALER_ADC, (uint32)pre);
}
void adc_foreach(void (*fn)(const adc_dev*)) {
fn(ADC1);
fn(ADC2);
#if defined(STM32_HIGH_DENSITY) || defined(STM32_XL_DENSITY)
fn(ADC3);
#endif
}
void adc_config_gpio(const adc_dev *ignored, gpio_dev *gdev, uint8 bit) {
gpio_set_mode(gdev, bit, GPIO_INPUT_ANALOG);
}
void adc_enable_single_swstart(const adc_dev *dev) {
adc_init(dev);
adc_set_extsel(dev, ADC_SWSTART);
adc_set_exttrig(dev, 1);
adc_enable(dev);
adc_calibrate(dev);
}
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