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Arduino/hardware/arduino/sam/system/libsam/source/adc12_sam3u.c

412 lines
10 KiB
C

/**
* \file
*
* \brief Analog-to-Digital Converter (ADC/ADC12B) driver for SAM.
*
* Copyright (c) 2011 - 2012 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
#include "../chip.h"
/// @cond 0
/**INDENT-OFF**/
#ifdef __cplusplus
extern "C" {
#endif
/**INDENT-ON**/
/// @endcond
/**
* \defgroup sam_drivers_adc_group Analog-to-digital Converter (ADC)
*
* Driver for the Analog-to-digital Converter. This driver provides access to the main
* features of the ADC controller.
*
* @{
*/
#if SAM3U_SERIES
/**
* \brief Initialize the given ADC with the specified ADC clock and startup time.
*
* \param p_adc Pointer to an ADC instance.
* \param ul_mck Main clock of the device (in Hz).
* \param ul_adc_clock Analog-to-Digital conversion clock (in Hz).
* \param ul_startuptime ADC startup time value (value in us).
* Please refer to the product datasheet for more details.
* \param ul_offmode_startuptime ADC off mode startup time value (value in us).
* Please refer to the product datasheet for more details.
*
* \return 0 on success.
*/
uint32_t adc12b_init(Adc12b *p_adc, const uint32_t ul_mck, const uint32_t ul_adc_clock,
const uint32_t ul_startuptime, const uint32_t ul_offmode_startuptime)
{
uint32_t ul_prescal, ul_startup, ul_offmode;
p_adc->ADC12B_CR = ADC12B_CR_SWRST;
/* Reset Mode Register */
p_adc->ADC12B_MR = 0;
/* Reset PDC transfer */
p_adc->ADC12B_PTCR = (ADC12B_PTCR_RXTDIS | ADC12B_PTCR_TXTDIS);
p_adc->ADC12B_RCR = 0;
p_adc->ADC12B_RNCR = 0;
ul_prescal = ul_mck / (2 * ul_adc_clock) - 1;
ul_startup = ((ul_adc_clock / 1000000) * ul_startuptime / 8) - 1;
ul_offmode = ((ul_adc_clock / 1000000) * ul_offmode_startuptime / 8) -
1;
p_adc->ADC12B_MR |=
ADC12B_MR_PRESCAL(ul_prescal) | ((ul_startup <<
ADC12B_MR_STARTUP_Pos) &
ADC12B_MR_STARTUP_Msk);
p_adc->ADC12B_EMR |= (ul_offmode << 16) & (0xffu << 16);
return 0;
}
/**
* \brief Configure conversion resolution.
*
* \param p_adc Pointer to an ADC instance.
* \param resolution ADC resolution.
*/
void adc12b_set_resolution(Adc12b *p_adc, const enum adc_resolution_t resolution)
{
p_adc->ADC12B_MR |= (resolution << 4) & ADC12B_MR_LOWRES;
}
/**
* \brief Configure conversion trigger and free run mode.
*
* \param p_adc Pointer to an ADC instance.
* \param trigger Conversion trigger.
*/
void adc12b_configure_trigger(Adc12b *p_adc, const enum adc_trigger_t trigger)
{
p_adc->ADC12B_MR |= trigger;
}
/**
* \brief Configure ADC power saving mode.
*
* \param p_adc Pointer to an ADC instance.
* \param uc_sleep ADC_MR_SLEEP_NORMAL keeps the ADC Core and reference
* voltage circuitry ON between conversions.
* ADC_MR_SLEEP_SLEEP keeps the ADC Core and reference voltage circuitry
* OFF between conversions.
* \param uc_offmode 0 Standby Mode (if Sleep Bit = 1), 1 Off Mode.
*/
void adc12b_configure_power_save(Adc12b *p_adc, const uint8_t uc_sleep,
uint8_t uc_offmode)
{
p_adc->ADC12B_MR |= ((uc_sleep << 5) & ADC12B_MR_SLEEP);
p_adc->ADC12B_EMR |= uc_offmode;
}
/**
* \brief Configure ADC timing.
*
* \param p_adc Pointer to an ADC instance.
* \param ul_sh ADC sample and hold time = uc_sh / ADC clock.
*/
void adc12b_configure_timing(Adc12b *p_adc, const uint32_t ul_sh)
{
p_adc->ADC12B_MR |= ADC12B_MR_SHTIM(ul_sh);
}
/**
* \brief Start ADC conversion.
*
* \note If one of the hardware event is selected as ADC trigger,
* this function can NOT start ADC conversion.
*
* \param p_adc Pointer to an ADC instance.
*/
void adc12b_start(Adc12b *p_adc)
{
p_adc->ADC12B_CR = ADC12B_CR_START;
}
/**
* \brief Stop ADC conversion.
* \param p_adc Pointer to an ADC instance.
*/
void adc12b_stop(Adc12b *p_adc)
{
p_adc->ADC12B_CR = ADC12B_CR_SWRST;
}
/**
* \brief Enable the specified ADC channel.
*
* \param p_adc Pointer to an ADC instance.
* \param adc_ch ADC channel number.
*/
void adc12b_enable_channel(Adc12b *p_adc, const enum adc_channel_num_t adc_ch)
{
p_adc->ADC12B_CHER = 1 << adc_ch;
}
/**
* \brief Enable all ADC channels.
*
* \param p_adc Pointer to an ADC instance.
*/
void adc12b_enable_all_channel(Adc12b *p_adc)
{
p_adc->ADC12B_CHER = 0xFF;
}
/**
* \brief Disable the specified ADC channel.
*
* \param p_adc Pointer to an ADC instance.
* \param adc_ch ADC channel number.
*/
void adc12b_disable_channel(Adc12b *p_adc, const enum adc_channel_num_t adc_ch)
{
p_adc->ADC12B_CHDR = 1 << adc_ch;
}
/**
* \brief Disable all ADC channel.
*
* \param p_adc Pointer to an ADC instance.
*/
void adc12b_disable_all_channel(Adc12b *p_adc)
{
p_adc->ADC12B_CHDR = 0xFF;
}
/**
* \brief Read the ADC channel status.
*
* \param p_adc Pointer to an ADC instance.
* \param adc_ch ADC channel number.
*
* \retval 1 if channel is enabled.
* \retval 0 if channel is disabled.
*/
uint32_t adc12b_get_channel_status(const Adc12b *p_adc, const enum adc_channel_num_t adc_ch)
{
return p_adc->ADC12B_CHSR & (1 << adc_ch);
}
/**
* \brief Read the ADC result data of the specified channel.
*
* \param p_adc Pointer to an ADC instance.
* \param adc_ch ADC channel number.
*
* \return ADC value of the specified channel.
*/
uint32_t adc12b_get_channel_value(const Adc12b *p_adc,const enum adc_channel_num_t adc_ch)
{
uint32_t dwData = 0;
if (15 >= adc_ch) {
dwData = *(p_adc->ADC12B_CDR + adc_ch);
}
return dwData;
}
/**
* \brief Read the last ADC result data.
*
* \param p_adc Pointer to an ADC instance.
*
* \return ADC latest value.
*/
uint32_t adc12b_get_latest_value(const Adc12b *p_adc)
{
return p_adc->ADC12B_LCDR;
}
/**
* \brief Enable differential input for all channels.
*
* \param p_adc Pointer to an ADC instance.
*/
void adc12b_enable_differential_input(Adc12b *p_adc)
{
p_adc->ADC12B_ACR |= (0x01u << 16);
}
/**
* \brief Disable differential input for the specified channel.
*
* \param p_adc Pointer to an ADC instance.
*/
void adc12b_disable_differential_input(Adc12b *p_adc)
{
p_adc->ADC12B_ACR &= (0x01u << 16);
}
/**
* \brief Enable analog signal offset for the specified channel.
*
* \param p_adc Pointer to an ADC instance.
*/
void adc12b_enable_input_offset(Adc12b *p_adc)
{
p_adc->ADC12B_ACR |= (0x01u << 17);
}
/**
* \brief Disable analog signal offset for the specified channel.
*
* \param p_adc Pointer to an ADC instance.
*/
void adc12b_disable_input_offset(Adc12b *p_adc)
{
p_adc->ADC12B_ACR &= (0x01u << 17);
}
/**
* \brief Configure input gain for the specified channel.
*
* \param p_adc Pointer to an ADC instance.
* \param gain Gain value for the input.
*/
void adc12b_set_input_gain(Adc12b *p_adc, const enum adc_gainvalue_t gain)
{
p_adc->ADC12B_ACR |= (0x03u & gain);
}
/**
* \brief Return the actual ADC clock.
*
* \param p_adc Pointer to an ADC instance.
* \param ul_mck Main clock of the device (in Hz).
*
* \retval 0 The actual ADC clock (in Hz).
*/
uint32_t adc12b_get_actual_adc_clock(const Adc12b *p_adc, const uint32_t ul_mck)
{
uint32_t ul_adcfreq;
uint32_t ul_prescal;
/* ADCClock = MCK / ( (PRESCAL+1) * 2 ) */
ul_prescal = ((p_adc->ADC12B_MR & ADC12B_MR_PRESCAL_Msk) >>
ADC12B_MR_PRESCAL_Pos);
ul_adcfreq = ul_mck / ((ul_prescal + 1) * 2);
return ul_adcfreq;
}
/**
* \brief Enable ADC interrupts.
*
* \param p_adc Pointer to an ADC instance.
* \param ul_source Interrupts to be enabled.
*/
void adc12b_enable_interrupt(Adc12b *p_adc, const uint32_t ul_source)
{
p_adc->ADC12B_IER = ul_source;
}
/**
* \brief Disable ADC interrupts.
*
* \param p_adc Pointer to an ADC instance.
* \param ul_source Interrupts to be disabled.
*/
void adc12b_disable_interrupt(Adc12b *p_adc, const uint32_t ul_source)
{
p_adc->ADC12B_IDR = ul_source;
}
/** \brief Read ADC interrupt mask.
*
* \param p_adc Pointer to an ADC instance.
*
* \return The interrupt mask value.
*/
uint32_t adc12b_get_interrupt_mask(const Adc12b *p_adc)
{
return p_adc->ADC12B_IMR;
}
/**
* \brief Read ADC interrupt status.
*
* \param p_adc Pointer to an ADC instance.
*
* \retval ADC interrupt status.
*/
uint32_t adc12b_get_status(const Adc12b *p_adc)
{
return p_adc->ADC12B_SR;
}
/**
* \brief Adapt performance versus power consumption.
*
* \note Please refer to ADC Characteristics in the product datasheet
* for more details.
*
* \param p_adc Pointer to an ADC instance.
* \param uc_ibctl ADC Bias current control.
*/
void adc12b_set_bias_current(Adc12b *p_adc, const uint8_t uc_ibctl)
{
p_adc->ADC12B_ACR |= ADC12B_ACR_IBCTL(uc_ibctl);
}
/**
* \brief Get PDC registers base address.
*
* \param p_adc Pointer to an ADC instance.
*
* \return ADC PDC register base address.
*/
Pdc *adc12b_get_pdc_base(const Adc12b *p_adc)
{
return PDC_ADC12B;
}
#endif
//@}
/// @cond 0
/**INDENT-OFF**/
#ifdef __cplusplus
}
#endif
/**INDENT-ON**/
/// @endcond