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

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/*! \file *********************************************************************
*
* \brief API for SAM3 Analog-to-Digital Converter (ADC/ADC12B) controller.
*
* ----------------------------------------------------------------------------
* SAM Software Package License
* ----------------------------------------------------------------------------
* Copyright (c) 2011, Atmel Corporation
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the disclaimer below.
*
* Atmel's name may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* DISCLAIMER: 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
* 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.
*
* - Compiler: IAR EWARM and CodeSourcery GCC for ARM
* - Supported devices: All SAM devices with a Analog-to-Digital Converter can be used.
* - AppNote:
*
* \author Atmel Corporation: http://www.atmel.com \n
* Support and FAQ: http://support.atmel.com/
*
*******************************************************************************/
#include "../chip.h"
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/// @cond 0
/**INDENT-OFF**/
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
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/**INDENT-ON**/
/// @endcond
#if SAM3U_SERIES
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/**
* \brief Initializes the given ADC with the specified ADC clock and startup time.
*
* \param p_adc Pointer to an ADC instance.
* \param dw_mck Main clock of the device (value in Hz).
* \param dw_adc_clock Analog-to-Digital conversion clock (value in Hz).
* \param ul_startuptime ADC start up time value(value in us). Please refer to the product datasheet for details.
* \param ul_offmode_startuptime ADC off mode startup Time value(value in us). Please refer to the product datasheet for details.
*
* \retval 0 The initialization operation succeeds.
* \retval others The initialization operation fails.
*/
uint32_t adc12_init(Adc12b *p_adc, uint32_t ul_mck, uint32_t ul_adc_clock, uint32_t ul_startuptime, uint32_t ul_offmode_startuptime)
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{
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;
uint32_t prescal = ul_mck/(2 * ul_adc_clock) - 1;
// check for rounding errors
if ( (ul_mck/((prescal+1)*2)) > ul_adc_clock ) {
prescal++;
ul_adc_clock = ul_mck/((prescal+1)*2);
}
uint32_t startup = ((ul_adc_clock/1000000) * ul_startuptime / 8) - 1;
p_adc->ADC12B_MR |= ADC12B_MR_PRESCAL(prescal) | ADC12B_MR_STARTUP(startup);
uint32_t offmode = ((ul_adc_clock/1000000) * ul_offmode_startuptime / 8) - 1;
p_adc->ADC12B_EMR |= ADC12B_EMR_OFF_MODE_STARTUP_TIME(offmode);
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return 0;
}
/**
* \brief Configures conversion resolution.
*
* \param p_adc Pointer to an ADC instance.
* \param resolution ADC resolution.
*/
void adc12_set_resolution(Adc12b *p_adc, adc_resolution_t resolution)
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{
p_adc->ADC12B_MR |= (resolution<<4) & ADC12B_MR_LOWRES;
}
/**
* \brief Configures conversion trigger and free run mode.
*
* \param p_adc Pointer to an ADC instance.
* \param trigger Conversion trigger.
*/
void adc12_configure_trigger(Adc12b *p_adc, adc_trigger_t trigger)
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{
p_adc->ADC12B_MR |= trigger;
}
/**
* \brief Configures 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 adc12_configure_power_save(Adc12b *p_adc, uint8_t uc_sleep, uint8_t uc_offmode)
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{
p_adc->ADC12B_MR |= ((uc_sleep<<5) & ADC12B_MR_SLEEP) ;
p_adc->ADC12B_EMR |= uc_offmode;
}
/**
* \brief Configures ADC timing.
*
* \param p_adc Pointer to an ADC instance.
* \param ul_sh ADC sample and hold time = uc_sh / ADC clock.
*
*/
void adc12_configure_timing(Adc12b *p_adc, uint32_t ul_sh)
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{
p_adc->ADC12B_MR |= ADC12B_MR_SHTIM( ul_sh ) ;
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}
/**
* \brief Starts analog-to-digital conversion.
*
* \note If one of the hardware event is selected as ADC trigger, this function can NOT start analog to digital conversion.
*
* \param p_adc Pointer to an ADC instance.
*/
void adc12_start(Adc12b *p_adc)
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{
p_adc->ADC12B_CR = ADC12B_CR_START;
}
/**
* \brief Stop analog-to-digital conversion.
* \param p_adc Pointer to an ADC instance.
*/
void adc12_stop(Adc12b *p_adc)
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{
p_adc->ADC12B_CR = ADC12B_CR_SWRST;
}
/**
* \brief Enables the specified ADC channel.
*
* \param p_adc Pointer to an ADC instance.
* \param adc_ch ADC channel number.
*/
void adc12_enable_channel(Adc12b *p_adc, adc_channel_num_t adc_ch)
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{
p_adc->ADC12B_CHER = 1 << adc_ch;
}
/**
* \brief Disables the specified ADC channel.
*
* \param p_adc Pointer to an ADC instance.
* \param adc_ch ADC channel number.
*/
void adc12_disable_channel(Adc12b *p_adc, adc_channel_num_t adc_ch)
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{
p_adc->ADC12B_CHDR = 1 << adc_ch;
}
/**
* \brief Reads the ADC channel status.
*
* \param p_adc Pointer to an ADC instance.
* \param adc_ch ADC channel number.
*
* \retval 1 means the specified channel is enabled.
* 0 means the specified channel is disabled.
*/
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uint32_t adc12_get_channel_status(Adc12b *p_adc, adc_channel_num_t adc_ch)
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{
return p_adc->ADC12B_CHSR & (1 << adc_ch);
}
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/**
* \brief Reads the ADC status.
*
* \param p_adc Pointer to an ADC instance.
*
* \retval ADC status register content.
*/
uint32_t adc12_get_status(Adc12b *p_adc)
{
return p_adc->ADC12B_SR;
}
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/**
* \brief Reads the ADC result data of the specified channel.
*
* \param p_adc Pointer to an ADC instance.
* \param adc_ch ADC channel number.
*
* \retval ADC data of the specified channel.
*/
uint32_t adc12_get_value(Adc12b *p_adc, adc_channel_num_t adc_ch)
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{
uint32_t dwData = 0;
if ( 15 >= adc_ch )
{
dwData=*(p_adc->ADC12B_CDR+adc_ch) ;
}
return dwData ;
}
/**
* \brief Reads the last ADC result data.
*
* \param p_adc Pointer to an ADC instance.
*
* \retval ADC data.
*/
uint32_t adc12_get_latest_value(Adc12b *p_adc)
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{
return p_adc->ADC12B_LCDR;
}
/**
* \brief Enables differential input for all channels.
*
* \param p_adc Pointer to an ADC instance.
*/
void adc12_enable_differential_input(Adc12b *p_adc)
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{
p_adc->ADC12B_ACR |= (0x01u << 16);
}
/**
* \brief Disables differential input for the specified channel.
*
* \param p_adc Pointer to an ADC instance.
*/
void adc12_disable_differential_input(Adc12b*p_adc)
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{
p_adc->ADC12B_ACR &= (0x01u << 16);
}
/**
* \brief Enables analog signal offset for the specified channel.
*
* \param p_adc Pointer to an ADC instance.
*/
void adc12_enable_input_offset(Adc12b *p_adc)
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{
p_adc->ADC12B_ACR |= (0x01u << 17);
}
/**
* \brief Disables analog signal offset for the specified channel.
*
* \param p_adc Pointer to an ADC instance.
*/
void adc12_disable_input_offset(Adc12b *p_adc)
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{
p_adc->ADC12B_ACR &= (0x01u << 17);
}
/**
* \brief Configures input gain for the specified channel.
*
* \param p_adc Pointer to an ADC instance.
* \param gain Gain value for the input.
*/
void adc12_set_input_gain(Adc12b *p_adc, adc_gainvalue_t gain)
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{
p_adc->ADC12B_ACR |= (0x03u & gain);
}
uint32_t adc12_get_actual_adc_clock(Adc12b *p_adc, uint32_t ul_mck)
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{
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 Enables ADC interrupt(s).
*
* \param p_adc Pointer to an ADC instance.
* \param dw_source Interrupt(s) to be enabled.
*/
void adc12_enable_interrupt(Adc12b *p_adc, uint32_t ul_source)
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{
p_adc->ADC12B_IER = ul_source;
}
/**
* \brief Disables ADC interrupt(s).
*
* \param p_adc Pointer to an ADC instance.
* \param dw_source Interrupt(s) to be disabled.
*/
void adc12_disable_interrupt(Adc12b *p_adc, uint32_t ul_source)
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{
p_adc->ADC12B_IDR = ul_source;
}
/** \brief Read ADC interrupt mask.
*
* \param p_uart pointer to a UART instance.
*
* \return The interrupt mask value.
*/
uint32_t adc12_get_interrupt_mask(Adc12b *p_adc)
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{
return p_adc->ADC12B_IMR;
}
/**
* \brief Reads ADC interrupt status.
*
* \param p_adc Pointer to an ADC instance.
*
* \retval ADC interrupt status.
*/
uint32_t adc12_get_interrupt_status(Adc12b *p_adc)
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{
return p_adc->ADC12B_SR ;
}
/**
* \brief Reads overrun status.
*
* \param p_adc Pointer to an ADC instance.
*
* \retval ADC overrun status.
*/
uint32_t adc12_check_ovr(Adc12b *p_adc,adc_channel_num_t adc_ch)
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{
return p_adc->ADC12B_SR & (0x01u << (adc_ch+8));
}
/**
* \brief Adapts performance versus power consumption.
*
* \note Please refer to ADC Characteristics in the product datasheet for the details.
*
* \param p_adc Pointer to an ADC instance.
* \param ibctl ADC Bias current control.
*/
void adc12_set_bias_current(Adc12b *p_adc, uint8_t uc_ibctl)
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{
p_adc->ADC12B_ACR |= ADC12B_ACR_IBCTL(uc_ibctl);
}
/**
* \brief Gets PDC registers base address.
*
* \param p_adc Pointer to an ADC instance.
*
* \retval PDC registers base for PDC driver to access.
*/
Pdc *adc12_get_pdc_base(Adc12b *p_adc)
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{
return PDC_ADC12B;
}
/// @cond 0
/**INDENT-OFF**/
#ifdef __cplusplus
}
#endif /* __cplusplus */
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/**INDENT-ON**/
/// @endcond
#endif /* SAM3U_SERIES */