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/** @defgroup adc_file ADC
@ingroup STM32L1xx
@brief <b>libopencm3 STM32L1xx Analog to Digital Converters</b>
@author @htmlonly © @endhtmlonly 2014 Karl Palsson <karlp@tweak.net.au>
LGPL License Terms @ref lgpl_license
*/
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2014 Karl Palsson <karlp@tweak.net.au>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/stm32/adc.h>
/**@{*/
/*---------------------------------------------------------------------------*/
/** @brief ADC Power On
If the ADC is in power-down mode then it is powered up. The application needs
to wait a time of about 3 microseconds for stabilization before using the ADC.
If the ADC is already on this function call will have no effect.
* NOTE Common with F4 and F2
@param[in] adc Unsigned int32. ADC block register address base @ref adc_reg_base
*/
void adc_power_on(uint32_t adc)
{
ADC_CR2(adc) |= ADC_CR2_ADON;
}
/*----------------------------------------------------------------------------*/
/** @brief ADC Set the Sample Time for a Single Channel
The sampling time can be selected in ADC clock cycles from 4 to 384.
@param[in] adc Unsigned int32. ADC block base address @ref adc_reg_base.
@param[in] channel uint8. ADC Channel integer 0..18 or from @ref adc_channel.
@param[in] time Unsigned int8. Sampling time selection from @ref adc_sample_rg.
*/
void adc_set_sample_time(uint32_t adc, uint8_t channel, uint8_t time)
{
uint32_t reg32;
if (channel < 10) {
reg32 = ADC_SMPR3(adc);
reg32 &= ~(0x7 << (channel * 3));
reg32 |= (time << (channel * 3));
ADC_SMPR3(adc) = reg32;
} else if (channel < 20) {
reg32 = ADC_SMPR2(adc);
reg32 &= ~(0x7 << ((channel - 10) * 3));
reg32 |= (time << ((channel - 10) * 3));
ADC_SMPR2(adc) = reg32;
} else {
reg32 = ADC_SMPR1(adc);
reg32 &= ~(0x7 << ((channel - 20) * 3));
reg32 |= (time << ((channel - 20) * 3));
ADC_SMPR1(adc) = reg32;
}
}
/*----------------------------------------------------------------------------*/
/** @brief ADC Set the Sample Time for All Channels
The sampling time can be selected in ADC clock cycles, same for
all channels.
@param[in] adc Unsigned int32. ADC block base address @ref adc_reg_base.
@param[in] time Unsigned int8. Sampling time selection from @ref adc_sample_rg.
*/
void adc_set_sample_time_on_all_channels(uint32_t adc, uint8_t time)
{
uint8_t i;
uint32_t reg32 = 0;
for (i = 0; i <= 9; i++) {
reg32 |= (time << (i * 3));
}
ADC_SMPR0(adc) = reg32;
ADC_SMPR1(adc) = reg32;
ADC_SMPR2(adc) = reg32;
ADC_SMPR3(adc) = reg32;
}
/*----------------------------------------------------------------------------*/
/** @brief ADC Enable The Temperature Sensor
This enables both the sensor and the reference voltage measurements on channels
16 and 17.
*/
void adc_enable_temperature_sensor()
{
ADC_CCR |= ADC_CCR_TSVREFE;
}
/*----------------------------------------------------------------------------*/
/** @brief ADC Disable The Temperature Sensor
Disabling this will reduce power consumption from the sensor and the reference
voltage measurements.
*/
void adc_disable_temperature_sensor()
{
ADC_CCR &= ~ADC_CCR_TSVREFE;
}
/*----------------------------------------------------------------------------*/
/** @brief ADC Disable an External Trigger for Regular Channels
@param[in] adc Unsigned int32. ADC block register address base @ref adc_reg_base
*/
void adc_disable_external_trigger_regular(uint32_t adc)
{
ADC_CR2(adc) &= ~ADC_CR2_EXTEN_MASK;
}
/*----------------------------------------------------------------------------*/
/** @brief ADC Disable an External Trigger for Injected Channels
@param[in] adc Unsigned int32. ADC block base address @ref adc_reg_base.
*/
void adc_disable_external_trigger_injected(uint32_t adc)
{
ADC_CR2(adc) &= ~ADC_CR2_JEXTEN_MASK;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Enable an External Trigger for Regular Channels
This enables an external trigger for set of defined regular channels, and sets
the polarity of the trigger event: rising or falling edge or both. Note that if
the trigger polarity is zero, triggering is disabled.
@param[in] adc Unsigned int32. ADC block register address base @ref adc_reg_base
@param[in] trigger Unsigned int32. Trigger identifier @ref adc_trigger_regular
@param[in] polarity Unsigned int32. Trigger polarity @ref
adc_trigger_polarity_regular
*/
void adc_enable_external_trigger_regular(uint32_t adc, uint32_t trigger,
uint32_t polarity)
{
uint32_t reg32 = ADC_CR2(adc);
reg32 &= ~(ADC_CR2_EXTSEL_MASK | ADC_CR2_EXTEN_MASK);
reg32 |= (trigger | polarity);
ADC_CR2(adc) = reg32;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Enable an External Trigger for Injected Channels
This enables an external trigger for set of defined injected channels, and sets
the polarity of the trigger event: rising or falling edge or both.
@param[in] adc Unsigned int32. ADC block register address base @ref adc_reg_base
@param[in] trigger Unsigned int8. Trigger identifier @ref adc_trigger_injected
@param[in] polarity Unsigned int32. Trigger polarity @ref
adc_trigger_polarity_injected
*/
void adc_enable_external_trigger_injected(uint32_t adc, uint32_t trigger,
uint32_t polarity)
{
uint32_t reg32 = ADC_CR2(adc);
reg32 &= ~(ADC_CR2_JEXTSEL_MASK | ADC_CR2_JEXTEN_MASK);
reg32 |= (trigger | polarity);
ADC_CR2(adc) = reg32;
}
/**@}*/
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