Analog-to-Digital Converter driver for SAM4L.

#include "compiler.h"
#include "pdca.h"
#include "sysclk.h"
#include "sleepmgr.h"
#include "conf_adcife.h"
#include "status_codes.h"

Data Structures
struct	adc_cdma_config
	Parameters for the configuration of the PDCA word. More...

struct	adc_cdma_first_config
	Parameters for the configuration of the First CDMA register. More...

struct	adc_cdma_second_config
	Parameters for the configuration of the Second CDMA register. More...

struct	adc_ch_config
	Parameters for the configuration of the Sequencer. More...

struct	adc_config
	ADC Configuration structure. More...

struct	adc_dev_inst
	ADC driver software instance structure. More...

struct	adc_pdca_config
	Parameters for the configuration of the PDCA word. More...

struct	adc_seq_config
	Parameters for the configuration of the Sequencer. More...

Macros
#define	ADC_NUM_OF_ATTEMPTS 10000
	Time out value (number of attempts) More...

Prescaler Rate Slection
#define	ADC_PRESCAL_DIV4 0

#define	ADC_PRESCAL_DIV8 1

#define	ADC_PRESCAL_DIV16 2

#define	ADC_PRESCAL_DIV32 3

#define	ADC_PRESCAL_DIV64 4

#define	ADC_PRESCAL_DIV128 5

#define	ADC_PRESCAL_DIV256 6

#define	ADC_PRESCAL_DIV512 7

Clock Selection for sequencer/ADC cell
#define	ADC_CLKSEL_GCLK 0

#define	ADC_CLKSEL_APBCLK 1

ADC current reduction
#define	ADC_SPEED_300K 0

#define	ADC_SPEED_225K 1

#define	ADC_SPEED_150K 2

#define	ADC_SPEED_75K 3

ADC Reference selection
#define	ADC_REFSEL_0 0

#define	ADC_REFSEL_1 1

#define	ADC_REFSEL_2 2

#define	ADC_REFSEL_3 3

#define	ADC_REFSEL_4 4

Zoom shift/unipolar reference source selection
#define	ADC_ZOOMRANGE_0 0

#define	ADC_ZOOMRANGE_1 1

#define	ADC_ZOOMRANGE_2 2

#define	ADC_ZOOMRANGE_3 3

#define	ADC_ZOOMRANGE_4 4

MUX selection on Negative ADC input channel
#define	ADC_MUXNEG_0 0

#define	ADC_MUXNEG_1 1

#define	ADC_MUXNEG_2 2

#define	ADC_MUXNEG_3 3

#define	ADC_MUXNEG_4 4

#define	ADC_MUXNEG_5 5

#define	ADC_MUXNEG_6 6

#define	ADC_MUXNEG_7 7

MUX selection on Positive ADC input channel
#define	ADC_MUXPOS_0 0

#define	ADC_MUXPOS_1 1

#define	ADC_MUXPOS_2 2

#define	ADC_MUXPOS_3 3

#define	ADC_MUXPOS_4 4

#define	ADC_MUXPOS_5 5

#define	ADC_MUXPOS_6 6

#define	ADC_MUXPOS_7 7

#define	ADC_MUXPOS_8 8

#define	ADC_MUXPOS_9 9

#define	ADC_MUXPOS_10 10

#define	ADC_MUXPOS_11 11

#define	ADC_MUXPOS_12 12

#define	ADC_MUXPOS_13 13

#define	ADC_MUXPOS_14 14

#define	ADC_MUXPOS_15 15

Internal Voltage Sources Selection
#define	ADC_INTERNAL_0 0

#define	ADC_INTERNAL_1 1

#define	ADC_INTERNAL_2 2

#define	ADC_INTERNAL_3 3

Resolution
#define	ADC_RES_8_BIT 1

#define	ADC_RES_12_BIT 0

Gain Compensation
#define	ADC_GCOMP_EN 1

#define	ADC_GCOMP_DIS 0

Bipolar Mode
#define	ADC_BIPOLAR_SINGLEENDED 0

#define	ADC_BIPOLAR_DIFFERENTIAL 1

Half Word Left Adjust
#define	ADC_HWLA_EN 1

#define	ADC_HWLA_DIS 0

Window Monitor Mode
#define	ADC_WM_OFF 0

#define	ADC_WM_MODE_1 1

#define	ADC_WM_MODE_2 2

#define	ADC_WM_MODE_3 3

#define	ADC_WM_MODE_4 4

Typedefs
typedef void(*	adc_callback_t )(void)

typedef enum adc_interrupt_source	adc_interrupt_source_t
	ADC interrupt source type. More...

Enumerations
enum	adc_gain_t { ADC_GAIN_1X = 0, ADC_GAIN_2X, ADC_GAIN_4X, ADC_GAIN_8X, ADC_GAIN_16X, ADC_GAIN_32X, ADC_GAIN_64X, ADC_GAIN_HALF }
	Definitions for ADC gain. More...

enum	adc_interrupt_source { ADC_SEQ_SEOC = ADCIFE_IER_SEOC, ADC_SEQ_LOVR = ADCIFE_IER_LOVR, ADC_WINDOW_MONITOR = ADCIFE_IER_WM, ADC_SEQ_MTRG = ADCIFE_IER_SMTRG, ADC_TTO = ADCIFE_IER_TTO }
	ADC interrupt source type. More...

enum	adc_trigger_t { ADC_TRIG_SW = 0, ADC_TRIG_INTL_TIMER, ADC_TRIG_INTL_TRIG_SRC, ADC_TRIG_CON, ADC_TRIG_EXT_PIN_RISE, ADC_TRIG_EXT_PIN_FALL, ADC_TRIG_EXT_PIN_BOTH }
	Definitions for ADC trigger. More...

Functions
static void	adc_ch_get_config_defaults (struct adc_ch_config *const cfg)
	Initializes an ADC channel configuration structure to defaults. More...

void	adc_ch_set_config (struct adc_dev_inst const dev_inst, struct adc_ch_config cfg)
	Configure ADC channel with specified value. More...

static void	adc_clear_status (struct adc_dev_inst *const dev_inst, const uint32_t status_flags)
	Clear ADC status. More...

static void	adc_configure_calibration (struct adc_dev_inst *const dev_inst, const bool fcd, const bool biassel, const uint8_t biascal, const uint8_t calib)
	Configure ADC calibration mode with specified value. More...

static void	adc_configure_gain (struct adc_dev_inst *const dev_inst, const enum adc_gain_t gain)
	Configure ADC gain with specified value. More...

static void	adc_configure_itimer_period (struct adc_dev_inst *const dev_inst, const uint32_t period)
	Configure ADC internal timer with specified value. More...

static void	adc_configure_trigger (struct adc_dev_inst *const dev_inst, const enum adc_trigger_t trigger)
	Configure ADC trigger source with specified value. More...

static void	adc_configure_wm_mode (struct adc_dev_inst *const dev_inst, const uint8_t mode)
	Configure ADC window monitor mode with specified value. More...

static void	adc_configure_wm_threshold (struct adc_dev_inst *const dev_inst, const uint16_t low_threshold, const uint16_t high_threshold)
	Configure ADC window monitor threshold with specified value. More...

void	adc_disable (struct adc_dev_inst *const dev_inst)
	Disable ADC module. More...

static void	adc_disable_interrupt (struct adc_dev_inst *const dev_inst, const adc_interrupt_source_t interrupt_source)
	Disable ADC interrupt. More...

status_code_t	adc_enable (struct adc_dev_inst *const dev_inst)
	Enable ADC module. More...

static void	adc_enable_interrupt (struct adc_dev_inst *const dev_inst, const adc_interrupt_source_t interrupt_source)
	Enable ADC interrupt. More...

static void	adc_get_config_defaults (struct adc_config *const cfg)
	Initializes an ADC module configuration structure to defaults. More...

static adc_interrupt_source_t	adc_get_interrupt_mask (struct adc_dev_inst *const dev_inst)
	Get ADC interrupt mask. More...

static uint8_t	adc_get_last_conv_nchannel (struct adc_dev_inst *const dev_inst)
	Get last converted ADC negative channel. More...

static uint8_t	adc_get_last_conv_pchannel (struct adc_dev_inst *const dev_inst)
	Get last ADC converted positive channel. More...

static uint16_t	adc_get_last_conv_value (struct adc_dev_inst *const dev_inst)
	Get last ADC converted value. More...

static uint32_t	adc_get_status (struct adc_dev_inst *const dev_inst)
	Get ADC status. More...

static uint8_t	adc_get_wm_mode (struct adc_dev_inst *const dev_inst)
	Get ADC window monitor mode. More...

status_code_t	adc_init (struct adc_dev_inst const dev_inst, Adcife const adc, struct adc_config *const cfg)
	Initialize the ADC module. More...

static bool	adc_is_busy_itimer (struct adc_dev_inst *const dev_inst)
	Check if internal timer is busy. More...

static void	adc_pdca_get_config_defaults (struct adc_pdca_config *const cfg)
	Initializes an ADC PDCA configuration structure to defaults. More...

void	adc_pdca_set_config (struct adc_pdca_config *cfg)
	Configure ADC sequencer support multi-channel mode. More...

void	adc_set_callback (struct adc_dev_inst *const dev_inst, adc_interrupt_source_t source, adc_callback_t callback, uint8_t irq_line, uint8_t irq_level)
	Set callback for ADC. More...

void	adc_set_config (struct adc_dev_inst const dev_inst, struct adc_config cfg)
	Configure ADC with specified value. More...

static void	adc_start_itimer (struct adc_dev_inst *const dev_inst)
	Start the ADC internal timer. More...

static void	adc_start_software_conversion (struct adc_dev_inst *const dev_inst)
	Start ADC software trigger conversion. More...

static void	adc_stop_itimer (struct adc_dev_inst *const dev_inst)
	Stop the ADC internal timer. More...

#define ADC_BIPOLAR_DIFFERENTIAL 1

Referenced by run_adcife_diff_test().

#define ADC_BIPOLAR_SINGLEENDED 0

Referenced by adc_ch_get_config_defaults(), run_adcife_itimer_trig_test(), and run_adcife_wm_test().

#define ADC_CLKSEL_APBCLK 1

Referenced by adc_get_config_defaults(), and run_adcife_init_test().

#define ADC_CLKSEL_GCLK 0

#define ADC_GCOMP_DIS 0

Referenced by adc_ch_get_config_defaults(), run_adcife_diff_test(), run_adcife_itimer_trig_test(), and run_adcife_wm_test().

#define ADC_GCOMP_EN 1

#define ADC_HWLA_DIS 0

Referenced by adc_ch_get_config_defaults(), run_adcife_diff_test(), run_adcife_itimer_trig_test(), and run_adcife_wm_test().

#define ADC_HWLA_EN 1

#define ADC_INTERNAL_0 0

#define ADC_INTERNAL_1 1

#define ADC_INTERNAL_2 2

#define ADC_INTERNAL_3 3

Referenced by adc_ch_get_config_defaults(), run_adcife_diff_test(), run_adcife_itimer_trig_test(), and run_adcife_wm_test().

#define ADC_MUXNEG_0 0

#define ADC_MUXNEG_1 1

Referenced by adc_ch_get_config_defaults(), run_adcife_diff_test(), run_adcife_itimer_trig_test(), and run_adcife_wm_test().

#define ADC_MUXNEG_2 2

#define ADC_MUXNEG_3 3

#define ADC_MUXNEG_4 4

#define ADC_MUXNEG_5 5

#define ADC_MUXNEG_6 6

#define ADC_MUXNEG_7 7

#define ADC_MUXPOS_0 0

#define ADC_MUXPOS_1 1

#define ADC_MUXPOS_10 10

#define ADC_MUXPOS_11 11

#define ADC_MUXPOS_12 12

#define ADC_MUXPOS_13 13

#define ADC_MUXPOS_14 14

#define ADC_MUXPOS_15 15

#define ADC_MUXPOS_2 2

Referenced by adc_ch_get_config_defaults(), run_adcife_diff_test(), run_adcife_itimer_trig_test(), and run_adcife_wm_test().

#define ADC_MUXPOS_3 3

Referenced by run_adcife_wm_test().

#define ADC_MUXPOS_4 4

#define ADC_MUXPOS_5 5

#define ADC_MUXPOS_6 6

#define ADC_MUXPOS_7 7

#define ADC_MUXPOS_8 8

#define ADC_MUXPOS_9 9

#define ADC_NUM_OF_ATTEMPTS 10000

Time out value (number of attempts)

Referenced by adc_enable(), and run_adcife_diff_test().

#define ADC_PRESCAL_DIV128 5

#define ADC_PRESCAL_DIV16 2

Referenced by adc_get_config_defaults(), and run_adcife_init_test().

#define ADC_PRESCAL_DIV256 6

#define ADC_PRESCAL_DIV32 3

#define ADC_PRESCAL_DIV4 0

#define ADC_PRESCAL_DIV512 7

#define ADC_PRESCAL_DIV64 4

#define ADC_PRESCAL_DIV8 1

#define ADC_REFSEL_0 0

Referenced by run_adcife_init_test().

#define ADC_REFSEL_1 1

Referenced by adc_get_config_defaults().

#define ADC_REFSEL_2 2

#define ADC_REFSEL_3 3

#define ADC_REFSEL_4 4

#define ADC_RES_12_BIT 0

Referenced by adc_ch_get_config_defaults(), run_adcife_diff_test(), run_adcife_itimer_trig_test(), and run_adcife_wm_test().

#define ADC_RES_8_BIT 1

#define ADC_SPEED_150K 2

Referenced by adc_get_config_defaults(), and run_adcife_init_test().

#define ADC_SPEED_225K 1

#define ADC_SPEED_300K 0

#define ADC_SPEED_75K 3

#define ADC_WM_MODE_1 1

#define ADC_WM_MODE_2 2

#define ADC_WM_MODE_3 3

Referenced by run_adcife_wm_test().

#define ADC_WM_MODE_4 4

#define ADC_WM_OFF 0

#define ADC_ZOOMRANGE_0 0

Referenced by adc_ch_get_config_defaults(), run_adcife_diff_test(), run_adcife_itimer_trig_test(), and run_adcife_wm_test().

#define ADC_ZOOMRANGE_1 1

#define ADC_ZOOMRANGE_2 2

#define ADC_ZOOMRANGE_3 3

#define ADC_ZOOMRANGE_4 4

typedef void(* adc_callback_t)(void)

typedef enum adc_interrupt_source adc_interrupt_source_t

ADC interrupt source type.

enum adc_gain_t

Definitions for ADC gain.

Enumerator
ADC_GAIN_1X
ADC_GAIN_2X
ADC_GAIN_4X
ADC_GAIN_8X
ADC_GAIN_16X
ADC_GAIN_32X
ADC_GAIN_64X
ADC_GAIN_HALF

enum adc_interrupt_source

ADC interrupt source type.

Enumerator
ADC_SEQ_SEOC
ADC_SEQ_LOVR
ADC_WINDOW_MONITOR
ADC_SEQ_MTRG
ADC_TTO

enum adc_trigger_t

Definitions for ADC trigger.

Enumerator
ADC_TRIG_SW
ADC_TRIG_INTL_TIMER
ADC_TRIG_INTL_TRIG_SRC
ADC_TRIG_CON
ADC_TRIG_EXT_PIN_RISE
ADC_TRIG_EXT_PIN_FALL
ADC_TRIG_EXT_PIN_BOTH

static void adc_ch_get_config_defaults ( struct adc_ch_config *const cfg )

inlinestatic

Initializes an ADC channel configuration structure to defaults.

Initializes a given ADC channel configuration structure to a set of known default values. This function should be called on all new instances of these configuration structures before being modified by the user application.

The default configuration is as follows:

Hardware Left Adjustment Disabled
Single Ended Mode Selected
Gain x1 Selected
Gain Compensation Disabled
Software Trigger Selected
12-bits resolution Selected
Enable the internal voltage sources
Mus Pos 2 / Mux Neg 1 selected
All modes except zoom and unipolar with hysteresis

Parameters

cfg	ADC channel configuration structure to initialize to default value

References ADC_BIPOLAR_SINGLEENDED, ADC_GAIN_1X, ADC_GCOMP_DIS, ADC_HWLA_DIS, ADC_INTERNAL_3, ADC_MUXNEG_1, ADC_MUXPOS_2, ADC_RES_12_BIT, ADC_TRIG_SW, ADC_ZOOMRANGE_0, Assert, adc_seq_config::bipolar, adc_seq_config::gain, adc_seq_config::gcomp, adc_ch_config::high_threshold, adc_seq_config::hwla, adc_seq_config::internal, adc_ch_config::internal_timer_max_count, adc_ch_config::low_threshold, adc_seq_config::muxneg, adc_seq_config::muxpos, adc_seq_config::res, adc_ch_config::seq_cfg, adc_seq_config::trgsel, adc_ch_config::window_mode, and adc_seq_config::zoomrange.

static void adc_clear_status	(	struct adc_dev_inst *const	dev_inst,
		const uint32_t	status_flags
	)

inlinestatic

Clear ADC status.

Parameters

dev_inst	Device structure pointer.
status_flags	status flag.

References adc_dev_inst::hw_dev.

Referenced by adcife_set_conv_flag(), and adcife_set_wm_flag().

static void adc_configure_calibration	(	struct adc_dev_inst *const	dev_inst,
		const bool	fcd,
		const bool	biassel,
		const uint8_t	biascal,
		const uint8_t	calib
	)

inlinestatic

Configure ADC calibration mode with specified value.

Parameters

dev_inst	Device structure pointer.
fcd	Flash Calibration Done.
biassel	Select bias mode.
biascal	Bias calibration.
calib	Calibration value.

References adc_dev_inst::hw_dev.

static void adc_configure_gain	(	struct adc_dev_inst *const	dev_inst,
		const enum adc_gain_t	gain
	)

inlinestatic

Configure ADC gain with specified value.

Parameters

dev_inst	Device structure pointer.
gain	gain value.

References adc_dev_inst::hw_dev.

Referenced by run_adcife_diff_test(), run_adcife_itimer_trig_test(), run_adcife_multichannel_test(), and run_adcife_wm_test().

static void adc_configure_itimer_period	(	struct adc_dev_inst *const	dev_inst,
		const uint32_t	period
	)

inlinestatic

Configure ADC internal timer with specified value.

Parameters

dev_inst	Device structure pointer.
period	Internal Timer Max Counter

References adc_dev_inst::hw_dev.

Referenced by run_adcife_itimer_trig_test().

static void adc_configure_trigger	(	struct adc_dev_inst *const	dev_inst,
		const enum adc_trigger_t	trigger
	)

inlinestatic

Configure ADC trigger source with specified value.

Parameters

dev_inst	Device structure pointer.
trigger	trigger source selection.

References adc_dev_inst::hw_dev.

Referenced by run_adcife_diff_test(), run_adcife_itimer_trig_test(), run_adcife_multichannel_test(), and run_adcife_wm_test().

static void adc_configure_wm_mode	(	struct adc_dev_inst *const	dev_inst,
		const uint8_t	mode
	)

inlinestatic

Configure ADC window monitor mode with specified value.

Parameters

dev_inst	Device structure pointer.
mode	Window Monitor Mode.

References adc_dev_inst::hw_dev.

Referenced by adc_ch_set_config().

static void adc_configure_wm_threshold	(	struct adc_dev_inst *const	dev_inst,
		const uint16_t	low_threshold,
		const uint16_t	high_threshold
	)

inlinestatic

Configure ADC window monitor threshold with specified value.

Parameters

dev_inst	Device structure pointer.
low_threshold	Low Threshold value.
high_threshold	HighThreshold value.

References adc_dev_inst::hw_dev.

Referenced by adc_ch_set_config().

static void adc_disable_interrupt	(	struct adc_dev_inst *const	dev_inst,
		const adc_interrupt_source_t	interrupt_source
	)

inlinestatic

Disable ADC interrupt.

Parameters

dev_inst	Device structure pointer.
interrupt_source	interrupt source.

References adc_dev_inst::hw_dev.

Referenced by adcife_set_conv_flag(), and adcife_set_wm_flag().

static void adc_enable_interrupt	(	struct adc_dev_inst *const	dev_inst,
		const adc_interrupt_source_t	interrupt_source
	)

inlinestatic

Enable ADC interrupt.

Parameters

dev_inst	Device structure pointer.
interrupt_source	interrupt source.

References adc_dev_inst::hw_dev.

Referenced by adc_set_callback(), and run_adcife_wm_test().

static void adc_get_config_defaults ( struct adc_config *const cfg )

inlinestatic

Initializes an ADC module configuration structure to defaults.

Initializes a given ADC module configuration structure to a set of known default values. This function should be called on all new instances of these configuration structures before being modified by the user application.

The default configuration is as follows:

ADC Prescaler initialized to ADC_PRESCAL_DIV16
ADC Clock Sel initialized to ADC_CLKSEL_APBCLK
ADC Speed Clock initialized to ADC_SPEED_150K
ADC Reference Selection initialized to ADC_REFSEL_1
ADC Startup Value initialized to CONFIG_ADC_STARTUP

Parameters

cfg	ADC module configuration structure to initialize to default value

References ADC_CLKSEL_APBCLK, ADC_PRESCAL_DIV16, ADC_REFSEL_1, ADC_SPEED_150K, Assert, adc_config::clksel, CONFIG_ADC_STARTUP, adc_config::prescal, adc_config::refsel, adc_config::speed, and adc_config::start_up.

static adc_interrupt_source_t adc_get_interrupt_mask ( struct adc_dev_inst *const dev_inst )

inlinestatic

Get ADC interrupt mask.

Parameters

dev_inst Device structure pointer.

References adc_dev_inst::hw_dev.

static uint8_t adc_get_last_conv_nchannel ( struct adc_dev_inst *const dev_inst )

inlinestatic

Get last converted ADC negative channel.

Parameters

dev_inst Device structure pointer.

References adc_dev_inst::hw_dev.

static uint8_t adc_get_last_conv_pchannel ( struct adc_dev_inst *const dev_inst )

inlinestatic

Get last ADC converted positive channel.

Parameters

dev_inst Device structure pointer.

References adc_dev_inst::hw_dev.

static uint16_t adc_get_last_conv_value ( struct adc_dev_inst *const dev_inst )

inlinestatic

Get last ADC converted value.

Parameters

dev_inst Device structure pointer.

References adc_dev_inst::hw_dev.

Referenced by run_adcife_diff_test().

static uint32_t adc_get_status ( struct adc_dev_inst *const dev_inst )

inlinestatic

Get ADC status.

Parameters

dev_inst Device structure pointer.

References adc_dev_inst::hw_dev.

Referenced by adcife_set_conv_flag(), and run_adcife_diff_test().

static uint8_t adc_get_wm_mode ( struct adc_dev_inst *const dev_inst )

inlinestatic

Get ADC window monitor mode.

Parameters

dev_inst Device structure pointer.

References adc_dev_inst::hw_dev.

static bool adc_is_busy_itimer ( struct adc_dev_inst *const dev_inst )

inlinestatic

Check if internal timer is busy.

Parameters

dev_inst Device structure pointer.

References adc_dev_inst::hw_dev.

static void adc_pdca_get_config_defaults ( struct adc_pdca_config *const cfg )

inlinestatic

Initializes an ADC PDCA configuration structure to defaults.

Initializes a given ADC PDCA configuration structure to a set of known default values. This function should be called on all new instances of these configuration structures before being modified by the user application.

Parameters