116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
/******************************************************************************
|
|
* 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
|
|
*/
|
|
|
|
adc_dev adc1 = {
|
|
.regs = ADC1_BASE,
|
|
.clk_id = RCC_ADC1,
|
|
};
|
|
/** ADC1 device. */
|
|
const adc_dev *ADC1 = &adc1;
|
|
|
|
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)
|
|
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
|
|
*
|
|
* Availability: STM32F1.
|
|
*
|
|
* @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);
|
|
}
|