lora-car/libopencm3/lib/stm32/f0/adc.c
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C

/** @addtogroup adc_file ADC peripheral API
* @ingroup peripheral_apis
*
* based on F3 file
*
* @date 14 July 2013
*
* LGPL License Terms @ref lgpl_license
*/
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2012 Ken Sarkies <ksarkies@internode.on.net>
*
* 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/cm3/assert.h>
#include <libopencm3/stm32/adc.h>
/**@{*/
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/**
* @defgroup adc_api_opmode ADC Operation mode API
* @ingroup adc_file
*
* @brief ADC Result API
*
*@{*/
/*---------------------------------------------------------------------------*/
/** @brief ADC Enable Discontinuous Mode for Regular Conversions
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
void adc_enable_discontinuous_mode(uint32_t adc)
{
ADC_CFGR1(adc) |= ADC_CFGR1_DISCEN;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Disable Discontinuous Mode for Regular Conversions
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
void adc_disable_discontinuous_mode(uint32_t adc)
{
ADC_CFGR1(adc) &= ~ADC_CFGR1_DISCEN;
}
/*---------------------------------------------------------------------------*/
/** ADC Set operation mode
*
* There are some operation modes, common for entire stm32 branch. In the text
* the braces are describing result to single trigger event. The trigger event
* is described by character T in the description. The ADC is configured to
* convert list of inputs [0, 1, 2, 3]. In Grouped modes, there is used group
* size of 2 conversions in the examples
*
* @li @c ADC_MODE_SEQUENTIAL: T(0) T(1) T(2) T(3)[EOSEQ] T(0) T(1) T(2) ...
*
* In this mode, after the trigger event a single channel is converted and the
* next channel in the list is prepared to convert on next trigger edge.
*
* @note This mode can be emulated by ADC_MODE_GROUPED with group size
* of 1.
*
* @li @c ADC_MODE_SCAN: T(0123)[EOSEQ] T(0123)[EOSEQ] T(0123)[EOSEQ]
*
* In this mode, after the trigger event, all channels will be converted once,
* storing results sequentially.
*
* @note The DMA must be configured properly for more than single channel to
* convert.
*
* @li @c ADC_MODE_SCAN_INFINITE: T(0123[EOSEQ]0123[EOSEQ]0123[EOSEQ]...)
*
* In this mode, after the trigger event, all channels from the list are
* converted. At the end of list, the conversion continues from the beginning.
*
* @note The DMA must be configured properly to operate in this mode.@par
*
* @li @c ADC_MODE_GROUPED: T(12) T(34)[EOSEQ] T(12) T(34)[EOSEQ] T(12)
*
* In this mode, after the trigger event, a specified group size of channels
* are converted. If the end of channel list occurs, the EOSEQ is generated
* and on the next trigger it wraps to the beginning.
*
* @note The DMA must be configured properly to operate on more than single
* channel conversion groups.
*
* @warning not all families supports all modes of operation of ADC.
*
*/
/*---------------------------------------------------------------------------*/
/** @brief ADC Set conversion operation mode
*
* @note on SEQUENTIAL mode, the trigger event is necessary to start conversion.
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
* @param[in] opmode ADC operation mode
*/
void adc_set_operation_mode(uint32_t adc, enum adc_opmode opmode)
{
switch (opmode) {
case ADC_MODE_SEQUENTIAL:
ADC_CFGR1(adc) &= ~ADC_CFGR1_CONT;
ADC_CFGR1(adc) |= ADC_CFGR1_DISCEN;
break;
case ADC_MODE_SCAN:
ADC_CFGR1(adc) &= ~(ADC_CFGR1_CONT | ADC_CFGR1_DISCEN);
break;
case ADC_MODE_SCAN_INFINITE:
ADC_CFGR1(adc) &= ~ADC_CFGR1_DISCEN;
ADC_CFGR1(adc) |= ADC_CFGR1_CONT;
break;
}
}
/**@}*/
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/**
* @defgroup adc_api_trigger ADC Trigger API
* @ingroup adc_file
*
* @brief ADC Trigger API
*
*@{*/
/*---------------------------------------------------------------------------*/
/** @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 base address (@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)
{
ADC_CFGR1(adc) = (ADC_CFGR1(adc) & ~ADC_CFGR1_EXTSEL) | trigger;
ADC_CFGR1(adc) = (ADC_CFGR1(adc) & ~ADC_CFGR1_EXTEN_MASK) | polarity;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Disable an External Trigger for Regular Channels
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
void adc_disable_external_trigger_regular(uint32_t adc)
{
ADC_CFGR1(adc) &= ~ADC_CFGR1_EXTEN_MASK;
}
/**@}*/
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/**
* @defgroup adc_api_interrupts ADC Interrupt configuration API
* @ingroup adc_file
*
* @brief ADC Interrupt configuration API
*
*@{*/
/*---------------------------------------------------------------------------*/
/** @brief ADC Enable Analog Watchdog Interrupt
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
void adc_enable_watchdog_interrupt(uint32_t adc)
{
ADC_IER(adc) |= ADC_IER_AWD1IE;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Disable Regular End-Of-Conversion Interrupt
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
void adc_disable_watchdog_interrupt(uint32_t adc)
{
ADC_IER(adc) &= ~ADC_IER_AWD1IE;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Read the Analog Watchdog Flag
*
* This flag is set when the converted voltage crosses the high or low
* thresholds.
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
* @returns bool true, if the signal is out of defined analog range.
*/
bool adc_get_watchdog_flag(uint32_t adc)
{
return ADC_ISR(adc) & ADC_ISR_AWD1;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Clear Analog Watchdog Flag
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
void adc_clear_watchdog_flag(uint32_t adc)
{
ADC_ISR(adc) = ADC_ISR_AWD1;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Enable Regular End-Of-Conversion Sequence Interrupt
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
void adc_enable_eoc_sequence_interrupt(uint32_t adc)
{
ADC_IER(adc) |= ADC_IER_EOSEQIE;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Disable Regular End-Of-Conversion Sequence Interrupt
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
void adc_disable_eoc_sequence_interrupt(uint32_t adc)
{
ADC_IER(adc) &= ~ADC_IER_EOSEQIE;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Read the Regular End-Of-Conversion Sequence Flag
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
bool adc_get_eoc_sequence_flag(uint32_t adc)
{
return ADC_ISR(adc) & ADC_ISR_EOSEQ;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Clear Regular End-Of-Conversion Sequence Flag
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
void adc_clear_eoc_sequence_flag(uint32_t adc)
{
ADC_ISR(adc) = ADC_ISR_EOSEQ;
}
/**@}*/
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/**
* @defgroup adc_api_config ADC Basic configuration API
* @ingroup adc_file
*
* @brief ADC Basic configuration API
*
*@{*/
/*---------------------------------------------------------------------------*/
/** @brief ADC Set Clock Source
*
* The ADC clock taken from the many sources.
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
* @param[in] source Unsigned int32. Source (@ref adc_api_clksource)
*/
void adc_set_clk_source(uint32_t adc, uint32_t source)
{
ADC_CFGR2(adc) = ((ADC_CFGR2(adc) & ~ADC_CFGR2_CKMODE) | source);
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Set a Regular Channel Conversion Sequence
*
* Define a sequence of channels to be converted as a regular group with a
* length from 1 to 18 channels. If this is called during conversion, the
* current conversion is reset and conversion begins again with the newly
* defined group.
*
* @warning This core doesn't support the random order of ADC conversions.
* The channel list must be ordered by channel number.
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
* @param[in] length Unsigned int8. Number of channels in the group.
* @param[in] channel Unsigned int8[]. Set of channels to convert, integers
* 0..18.
*/
void adc_set_regular_sequence(uint32_t adc, uint8_t length, uint8_t channel[])
{
uint32_t reg32 = 0;
uint8_t i = 0;
bool stepup = false, stepdn = false;
if (length == 0) {
ADC_CHSELR(adc) = 0;
return;
}
reg32 |= (1 << channel[0]);
for (i = 1; i < length; i++) {
reg32 |= (1 << channel[i]);
stepup |= channel[i-1] < channel[i];
stepdn |= channel[i-1] > channel[i];
}
/* Check, if the channel list is in order */
if (stepup && stepdn) {
cm3_assert_not_reached();
}
/* Update the scan direction flag */
if (stepdn) {
ADC_CFGR1(adc) |= ADC_CFGR1_SCANDIR;
} else {
ADC_CFGR1(adc) &= ~ADC_CFGR1_SCANDIR;
}
ADC_CHSELR(adc) = reg32;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Set the Sample Time for All Channels
*
* The sampling time can be selected in ADC clock cycles from 1.5 to 239.5,
* same for all channels.
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
* @param[in] time Unsigned int8. Sampling time selection (@ref adc_api_smptime)
*/
void adc_set_sample_time_on_all_channels(uint32_t adc, uint8_t time)
{
ADC_SMPR(adc) = time & ADC_SMPR_SMP;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Enable The VBat Sensor
*
* This enables the battery voltage measurements on channel 17.
*/
void adc_enable_vbat_sensor(void)
{
ADC_CCR(ADC1) |= ADC_CCR_VBATEN;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Disable The VBat Sensor
*
* Disabling this will reduce power consumption from the battery voltage
* measurement.
*/
void adc_disable_vbat_sensor(void)
{
ADC_CCR(ADC1) &= ~ADC_CCR_VBATEN;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Start the calibration procedure
* @deprecated Replaced by adc_calibrate/_async/is_calibrating
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
void adc_calibrate_start(uint32_t adc)
{
ADC_CR(adc) = ADC_CR_ADCAL;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Wait to finish the ADC calibration procedure
* @deprecated Replaced by adc_calibrate/_async/is_calibrating
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
void adc_calibrate_wait_finish(uint32_t adc)
{
while (ADC_CR(adc) & ADC_CR_ADCAL);
}
/**@}*/
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/**
* @defgroup adc_api_wdg ADC Analog watchdog API
* @ingroup adc_file
*
* @brief ADC analog watchdog API definitions.
*
* The analog watchdog allows the monitoring of an analog signal between two
* threshold levels. The thresholds must be preset. Analog watchdog is disabled
* by default.
*
* @warning Comparison is done before data alignment takes place, so the
* thresholds are left-aligned.
*
* Example 1: Enable watchdog checking on all channels
*
* @code
* // in configuration
* adc_enable_analog_watchdog_on_all_channels(ADC1);
* adc_set_watchdog_high_threshold(ADC1, 0xE00);
* adc_set_watchdog_low_threshold(ADC1, 0x200);
*
* // in the main application thread
* if (adc_get_watchdog_flag(ADC1)) {
* // the converted signal is out of AWD ranges
* adc_clear_watchdog_flag(ADC1);
* }
* @endcode
*
* Example 2: Enable watchdog checking on channel 5
*
* @code
* // in configuration
* adc_enable_analog_watchdog_on_selected_channel(ADC1,5);
* adc_set_watchdog_high_threshold(ADC1, 0xE00);
* adc_set_watchdog_low_threshold(ADC1, 0x200);
*
* // in the main application thread
* if (adc_get_watchdog_flag(ADC1)) {
* // the converted signal is out of AWD ranges
* adc_clear_watchdog_flag(ADC1);
* }
* @endcode
*@{*/
/*---------------------------------------------------------------------------*/
/** @brief ADC Enable Analog Watchdog for All Channels
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
void adc_enable_analog_watchdog_on_all_channels(uint32_t adc)
{
ADC_CFGR1(adc) |= ADC_CFGR1_AWD1EN;
ADC_CFGR1(adc) &= ~ADC_CFGR1_AWD1SGL;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Enable Analog Watchdog for a Selected Channel
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
* @param[in] chan Unsigned int8. ADC channel number @ref adc_api_channel
*/
void adc_enable_analog_watchdog_on_selected_channel(uint32_t adc, uint8_t chan)
{
ADC_CFGR1(adc) = (ADC_CFGR1(adc) & ~ADC_CFGR1_AWD1CH) |
ADC_CFGR1_AWD1CH_VAL(chan);
ADC_CFGR1(adc) |= ADC_CFGR1_AWD1EN | ADC_CFGR1_AWD1SGL;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Disable Analog Watchdog
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
*/
void adc_disable_analog_watchdog(uint32_t adc)
{
ADC_CFGR1(adc) &= ~ADC_CFGR1_AWD1EN;
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Set Analog Watchdog Upper Threshold
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
* @param[in] threshold Upper threshold value
*/
void adc_set_watchdog_high_threshold(uint32_t adc, uint16_t threshold)
{
ADC_TR1(adc) = (ADC_TR1(adc) & ~ADC_TR1_HT) | ADC_TR1_HT_VAL(threshold);
}
/*---------------------------------------------------------------------------*/
/** @brief ADC Set Analog Watchdog Lower Threshold
*
* @param[in] adc Unsigned int32. ADC base address (@ref adc_reg_base)
* @param[in] threshold Lower threshold value
*/
void adc_set_watchdog_low_threshold(uint32_t adc, uint16_t threshold)
{
ADC_TR1(adc) = (ADC_TR1(adc) & ~ADC_TR1_LT) | ADC_TR1_LT_VAL(threshold);
}
/**@}*/
/*---------------------------------------------------------------------------*/
/**@}*/