This driver for Atmel® | SMART ARM®-based microcontrollers provides an interface for the configuration and management of the device's SDADC functionality.

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The following peripheral is used by this module:

SDADC (Sigma-Delta Analog-to-Digital Converter)

The following devices can use this module:

Atmel | SMART SAM C21

The outline of this documentation is as follows:

Prerequisites

There are no prerequisites for this module.

Module Overview

The Sigma-Delta Analog-to-Digital Converter (SDADC) converts analog signals to digital values. The sigma-delta architecture of the SDADC implies a filtering and a decimation of the bitstream at the output of the SDADC. The input selection is up to three input analog channels.

The SDADC provides up to 16-bit resolution at about 1000 samples per second (1KSPS) and sized 24 bits signed result to handle filtering and gain correction without overflow. The SDADC measurements can be started by either application software or an incoming event from another peripheral in the device.

The conversion is performed on a full range between 0V and the reference voltage. Both internal and external reference voltages can be selected. The reference range must be set to match the voltage of the reference used. Analog inputs between these voltages convert to values based on a linear conversion.

Sample Clock

A generic clock (GCLK_SDADC) is required to generate the CLK_SDADC to the SDADC module. The SDADC features a prescaler, which enables conversion at lower clock rates than the input Generic Clock to the SDADC module.

The SDADC data sampling frequency (CLK_SDADC_FS) in the SDADC module is the CLK_SDADC/4, the reduction comes from the phase generator between the prescaler and the SDADC.

OSR is the Over Sampling Ratio, which can be modified to change the output data rate. The conversion time depends on the selected OSR and the sampling frequency of the SDADC. The conversion time can be described with:

\[ t_{SAMPLE} = \frac {22 + 3 \times OSR} {CLK \_ SDADC \_ FS} \]

Initialization of the SDADC (22 sigma-delta samples).
Filling of the decimation filter (3*OSR sigma-delta samples).

Gain and Offset Correction

A specific offset, gain, and shift can be applied to each source of the SDADC by performing the following operation:

\[ Data = (Data_{0} + OFFSET) \times \frac {GAIN}{2^{SHIFT}} \]

Window Monitor

The SDADC module window monitor function can be used to automatically compare the conversion result against a predefined pair of upper and lower threshold values.

Events

Event generation and event actions are configurable in the SDADC.

The SDADC has two actions that can be triggered upon event reception:

Start conversion
Conversion flush

The SDADC can generate two kinds of events:

Window monitor
Result ready

If the event actions are enabled in the configuration, any incoming event will trigger the action.

If the window monitor event is enabled, an event will be generated when the configured window condition is detected.

If the result ready event is enabled, an event will be generated when a conversion is completed.

Special Considerations

There are no special considerations for this module.

Extra Information

For extra information see Extra Information for SDADC Driver. This includes:

Examples

For a list of examples related to this driver, see Examples for SDADC Driver.

API Overview

Modules
	Quick Start Guide(s)
	In this section you can find a list of all Quick Start guides related to the SAM Sigma-Delta Analog-to-Digital Converter (SDADC) Driver.

Data Structures
struct	sdadc_config
	SDADC configuration structure. More...

struct	sdadc_correction_config
	SDADC correction configuration structure. More...

struct	sdadc_events
	SDADC event enable/disable structure. More...

struct	sdadc_module
	SDADC software device instance structure. More...

struct	sdadc_reference
	Reference configuration structure. More...

struct	sdadc_window_config
	Window monitor configuration structure. More...

Typedefs
typedef void(*	sdadc_callback_t )(const struct sdadc_module *const module)
	Type of the callback functions. More...

Enumerations
enum	sdadc_callback { SDADC_CALLBACK_READ_BUFFER, SDADC_CALLBACK_WINDOW, SDADC_CALLBACK_ERROR }
	SDADC Callback enum. More...

enum	sdadc_event_action { SDADC_EVENT_ACTION_DISABLED = 0, SDADC_EVENT_ACTION_FLUSH_START_CONV = SDADC_EVCTRL_FLUSHEI, SDADC_EVENT_ACTION_START_CONV = SDADC_EVCTRL_STARTEI }
	SDADC event action enum. More...

enum	sdadc_interrupt_flag { SDADC_INTERRUPT_RESULT_READY = SDADC_INTFLAG_RESRDY, SDADC_INTERRUPT_OVERRUN = SDADC_INTFLAG_OVERRUN, SDADC_INTERRUPT_WINDOW = SDADC_INTFLAG_WINMON }
	Enum for the possible SDADC interrupt flags. More...

enum	sdadc_job_type { SDADC_JOB_READ_BUFFER }
	Enum for the possible types of SDADC asynchronous jobs that may be issued to the driver. More...

enum	sdadc_mux_input { SDADC_MUX_INPUT_AIN0 = SDADC_INPUTCTRL_MUXSEL_AIN0, SDADC_MUX_INPUT_AIN1 = SDADC_INPUTCTRL_MUXSEL_AIN1, SDADC_MUX_INPUT_AIN2 = SDADC_INPUTCTRL_MUXSEL_AIN2 }
	SDADC MUX input selection enum. More...

enum	sdadc_over_sampling_ratio { SDADC_OVER_SAMPLING_RATIO64 = SDADC_CTRLB_OSR(0), SDADC_OVER_SAMPLING_RATIO128 = SDADC_CTRLB_OSR(1), SDADC_OVER_SAMPLING_RATIO256 = SDADC_CTRLB_OSR(2), SDADC_OVER_SAMPLING_RATIO512 = SDADC_CTRLB_OSR(3), SDADC_OVER_SAMPLING_RATIO1024 = SDADC_CTRLB_OSR(4) }
	SDADC over sampling ratio enum. More...

enum	sdadc_reference_range { SDADC_REFRANGE_0 = SDADC_REFCTRL_REFRANGE(0), SDADC_REFRANGE_1 = SDADC_REFCTRL_REFRANGE(1), SDADC_REFRANGE_2 = SDADC_REFCTRL_REFRANGE(2), SDADC_REFRANGE_3 = SDADC_REFCTRL_REFRANGE(3) }
	SDADC reference range enum. More...

enum	sdadc_reference_select { SDADC_REFERENCE_INTREF = SDADC_REFCTRL_REFSEL(0), SDADC_REFERENCE_AREFB = SDADC_REFCTRL_REFSEL(1), SDADC_REFERENCE_DACOUT = SDADC_REFCTRL_REFSEL(2), SDADC_REFERENCE_INTVCC = SDADC_REFCTRL_REFSEL(3) }
	SDADC reference voltage enum. More...

enum	sdadc_window_mode { SDADC_WINDOW_MODE_DISABLE = SDADC_WINCTRL_WINMODE(0), SDADC_WINDOW_MODE_ABOVE = SDADC_WINCTRL_WINMODE(1), SDADC_WINDOW_MODE_BELOW = SDADC_WINCTRL_WINMODE(2), SDADC_WINDOW_MODE_INSIDE = SDADC_WINCTRL_WINMODE(3), SDADC_WINDOW_MODE_OUTSIDE = SDADC_WINCTRL_WINMODE(4) }
	SDADC window monitor mode enum. More...

Callback Management
void	sdadc_register_callback (struct sdadc_module *const module, sdadc_callback_t callback_func, enum sdadc_callback callback_type)
	Registers a callback. More...

void	sdadc_unregister_callback (struct sdadc_module *module, enum sdadc_callback callback_type)
	Unregisters a callback. More...

static void	sdadc_enable_callback (struct sdadc_module *const module, enum sdadc_callback callback_type)
	Enables callback. More...

static void	sdadc_disable_callback (struct sdadc_module *const module, enum sdadc_callback callback_type)
	Disables callback. More...

Job Management
enum status_code	sdadc_read_buffer_job (struct sdadc_module const module_inst, int32_t buffer, uint16_t samples)
	Read multiple samples from SDADC. More...

enum status_code	sdadc_get_job_status (struct sdadc_module *module_inst, enum sdadc_job_type type)
	Gets the status of a job. More...

void	sdadc_abort_job (struct sdadc_module *module_inst, enum sdadc_job_type type)
	Aborts an ongoing job. More...

Module Status Flags
SDADC status flags, returned by sdadc_get_status() and cleared by sdadc_clear_status().
#define	SDADC_STATUS_RESULT_READY (1UL << 0)
	SDADC result ready. More...

#define	SDADC_STATUS_OVERRUN (1UL << 1)
	SDADC result overwritten before read. More...

#define	SDADC_STATUS_WINDOW (1UL << 2)
	Window monitor match. More...

Driver Initialization and Configuration
enum status_code	sdadc_init (struct sdadc_module const module_inst, Sdadc hw, struct sdadc_config *config)
	Initializes the SDADC. More...

static void	sdadc_get_config_defaults (struct sdadc_config *const config)
	Initializes an SDADC configuration structure to defaults. More...

Status Management
static uint32_t	sdadc_get_status (struct sdadc_module *const module_inst)
	Retrieves the current module status. More...

static void	sdadc_clear_status (struct sdadc_module *const module_inst, const uint32_t status_flags)
	Clears a module status flag. More...

static bool	sdadc_get_sequence_status (struct sdadc_module const module_inst, uint8_t seq_state)
	Get a module sequence flag. More...

Enable, Disable, and Reset SDADC Module, Start Conversion and Read Result
static bool	sdadc_is_syncing (struct sdadc_module *const module_inst)
	Determines if the hardware module(s) are currently synchronizing to the bus. More...

static enum status_code	sdadc_enable (struct sdadc_module *const module_inst)
	Enables the SDADC module. More...

static enum status_code	sdadc_disable (struct sdadc_module *const module_inst)
	Disables the SDADC module. More...

static enum status_code	sdadc_reset (struct sdadc_module *const module_inst)
	Resets the SDADC module. More...

static void	sdadc_enable_events (struct sdadc_module const module_inst, struct sdadc_events const events)
	Enables an SDADC event input or output. More...

static void	sdadc_disable_events (struct sdadc_module const module_inst, struct sdadc_events const events)
	Disables an SDADC event input or output. More...

static void	sdadc_start_conversion (struct sdadc_module *const module_inst)
	Starts an SDADC conversion. More...

static enum status_code	sdadc_read (struct sdadc_module const module_inst, int32_t result)
	Reads the SDADC result. More...

Runtime Changes of SDADC Module
static void	sdadc_flush (struct sdadc_module *const module_inst)
	Flushes the SDADC pipeline. More...

static void	sdadc_set_window_mode (struct sdadc_module *const module_inst, const enum sdadc_window_mode window_mode, const int16_t window_lower_value, const int16_t window_upper_value)
	Sets the SDADC window mode. More...

static void	sdadc_set_mux_input (struct sdadc_module *const module_inst, const enum sdadc_mux_input mux_input)
	Sets MUX SDADC input pin. More...

Enable and Disable Interrupts
static void	sdadc_enable_interrupt (struct sdadc_module *const module_inst, enum sdadc_interrupt_flag interrupt)
	Enable interrupt. More...

static void	sdadc_disable_interrupt (struct sdadc_module *const module_inst, enum sdadc_interrupt_flag interrupt)
	Disable interrupt. More...

#define SDADC_STATUS_OVERRUN (1UL << 1)

SDADC result overwritten before read.

Referenced by sdadc_clear_status(), sdadc_get_status(), and sdadc_read().

#define SDADC_STATUS_RESULT_READY (1UL << 0)

SDADC result ready.

Referenced by sdadc_clear_status(), sdadc_get_status(), and sdadc_read().

#define SDADC_STATUS_WINDOW (1UL << 2)

Window monitor match.

Referenced by sdadc_clear_status(), and sdadc_get_status().

typedef void(* sdadc_callback_t)(const struct sdadc_module *const module)

Type of the callback functions.

enum sdadc_callback

SDADC Callback enum.

Callback types for SDADC callback driver.

Enumerator
SDADC_CALLBACK_READ_BUFFER	Callback for buffer received.
SDADC_CALLBACK_WINDOW	Callback when window is hit.
SDADC_CALLBACK_ERROR	Callback for error.

enum sdadc_event_action

SDADC event action enum.

Enum for the possible actions to take on an incoming event.

Enumerator
SDADC_EVENT_ACTION_DISABLED	Event action disabled.
SDADC_EVENT_ACTION_FLUSH_START_CONV	Flush SDADC and start conversion.
SDADC_EVENT_ACTION_START_CONV	Start conversion.

enum sdadc_interrupt_flag

Enum for the possible SDADC interrupt flags.

Enumerator
SDADC_INTERRUPT_RESULT_READY	SDADC result ready.
SDADC_INTERRUPT_OVERRUN	SDADC result overwritten before read.
SDADC_INTERRUPT_WINDOW	Window monitor match.

enum sdadc_job_type

Enum for the possible types of SDADC asynchronous jobs that may be issued to the driver.

Enumerator
SDADC_JOB_READ_BUFFER	Asynchronous SDADC read into a user provided buffer.

enum sdadc_mux_input

SDADC MUX input selection enum.

Enum for the possible MUX input selections for the SDADC.

Enumerator
SDADC_MUX_INPUT_AIN0	Select SDADC AINN0 and AINP0 pins.
SDADC_MUX_INPUT_AIN1	Select SDADC AINN1 and AINP1 pins.
SDADC_MUX_INPUT_AIN2	Select SDADC AINN2 and AINP2 pins.

enum sdadc_over_sampling_ratio

SDADC over sampling ratio enum.

Enum for the over sampling ratio, which change the output data rate.

Enumerator
SDADC_OVER_SAMPLING_RATIO64	SDADC over Sampling Ratio is 64.
SDADC_OVER_SAMPLING_RATIO128	SDADC over Sampling Ratio is 128.
SDADC_OVER_SAMPLING_RATIO256	SDADC over Sampling Ratio is 256.
SDADC_OVER_SAMPLING_RATIO512	SDADC over Sampling Ratio is 512.
SDADC_OVER_SAMPLING_RATIO1024	SDADC over Sampling Ratio is 1024.

enum sdadc_reference_range

SDADC reference range enum.

Enum for the matched voltage range of the SDADC reference used.

Enumerator
SDADC_REFRANGE_0	Vref < 1.4V.
SDADC_REFRANGE_1	1.4V < Vref < 2.4V
SDADC_REFRANGE_2	2.4V < Vref < 3.6V
SDADC_REFRANGE_3	Vref > 3.6V.

enum sdadc_reference_select

SDADC reference voltage enum.

Enum for the possible reference voltages for the SDADC.

Enumerator
SDADC_REFERENCE_INTREF	Internal Bandgap Reference.
SDADC_REFERENCE_AREFB	External reference B.
SDADC_REFERENCE_DACOUT	DACOUT.
SDADC_REFERENCE_INTVCC	VDDANA.

enum sdadc_window_mode

SDADC window monitor mode enum.

Enum for the possible window monitor modes for the SDADC.

Enumerator
SDADC_WINDOW_MODE_DISABLE	No window mode.
SDADC_WINDOW_MODE_ABOVE	RESULT > WINLT.
SDADC_WINDOW_MODE_BELOW	RESULT < WINUT.
SDADC_WINDOW_MODE_INSIDE	WINLT < RESULT < WINUT.
SDADC_WINDOW_MODE_OUTSIDE	!(WINLT < RESULT < WINUT)

void sdadc_abort_job	(	struct sdadc_module *	module_inst,
		enum sdadc_job_type	type
	)

Aborts an ongoing job.

Aborts an ongoing job with given type.

Parameters

[in]	module_inst	Pointer to the SDADC software instance struct
[in]	type	Type of job to abort

References Assert, sdadc_disable_interrupt(), SDADC_INTERRUPT_RESULT_READY, SDADC_JOB_READ_BUFFER, and STATUS_ABORTED.

static void sdadc_clear_status	(	struct sdadc_module *const	module_inst,
		const uint32_t	status_flags
	)

inlinestatic

Clears a module status flag.

Clears the given status flag of the module.

Parameters

[in]	module_inst	Pointer to the SDADC software instance struct
[in]	status_flags	Bitmask of `SDADC_STATUS_*` flags to clear

References Assert, SDADC_STATUS_OVERRUN, SDADC_STATUS_RESULT_READY, and SDADC_STATUS_WINDOW.

Referenced by sdadc_read().

static enum status_code sdadc_disable ( struct sdadc_module *const module_inst )

inlinestatic

Disables the SDADC module.

Disables an SDADC module that was previously enabled.

Parameters

[in] module_inst Pointer to the SDADC software instance struct

References Assert, sdadc_is_syncing(), STATUS_OK, and system_interrupt_disable().

Referenced by sdadc_reset().

static void sdadc_disable_callback	(	struct sdadc_module *const	module,
		enum sdadc_callback	callback_type
	)

inlinestatic

Disables callback.

Disables the callback function registered by the sdadc_register_callback.

Parameters

[in]	module	Pointer to SDADC software instance struct
[in]	callback_type	Callback type given by an enum

Returns: Status of the operation.

Return values

STATUS_OK	If operation was completed
STATUS_ERR_INVALID	If operation was not completed, due to invalid callback_type

References Assert, SDADC_CALLBACK_ERROR, SDADC_CALLBACK_WINDOW, sdadc_disable_interrupt(), SDADC_INTERRUPT_OVERRUN, and SDADC_INTERRUPT_WINDOW.

static void sdadc_disable_events	(	struct sdadc_module *const	module_inst,
		struct sdadc_events *const	events
	)

inlinestatic

Disables an SDADC event input or output.

Disables one or more input or output events to or from the SDADC module. See sdadc_events for a list of events this module supports.

Note: Events cannot be altered while the module is enabled.

Parameters

[in]	module_inst	Software instance for the SDADC peripheral
[in]	events	Struct containing flags of events to disable

References Assert, sdadc_events::generate_event_on_conversion_done, and sdadc_events::generate_event_on_window_monitor.

static void sdadc_disable_interrupt	(	struct sdadc_module *const	module_inst,
		enum sdadc_interrupt_flag	interrupt
	)

inlinestatic

Disable interrupt.

Disable the given interrupt request from the SDADC module.

Parameters

[in]	module_inst	Pointer to the SDADC software instance struct
[in]	interrupt	Interrupt to disable

References Assert.

Referenced by _sdadc_interrupt_handler(), sdadc_abort_job(), and sdadc_disable_callback().

static enum status_code sdadc_enable ( struct sdadc_module *const module_inst )

inlinestatic

Enables the SDADC module.

Enables an SDADC module that has previously been configured. If any internal reference is selected it will be enabled.

Parameters

[in] module_inst Pointer to the SDADC software instance struct

References Assert, sdadc_is_syncing(), STATUS_OK, and system_interrupt_enable().

Referenced by configure_sdadc().

static void sdadc_enable_callback	(	struct sdadc_module *const	module,
		enum sdadc_callback	callback_type
	)

inlinestatic

Enables callback.

Enables the callback function registered by sdadc_register_callback. The callback function will be called from the interrupt handler when the conditions for the callback type are met.

Parameters

[in]	module	Pointer to SDADC software instance struct
[in]	callback_type	Callback type given by an enum

Returns: Status of the operation.

Return values

STATUS_OK	If operation was completed
STATUS_ERR_INVALID	If operation was not completed, due to invalid callback_type

References Assert, SDADC_CALLBACK_ERROR, SDADC_CALLBACK_WINDOW, sdadc_enable_interrupt(), SDADC_INTERRUPT_OVERRUN, and SDADC_INTERRUPT_WINDOW.

Referenced by configure_sdadc_callbacks().

static void sdadc_enable_events	(	struct sdadc_module *const	module_inst,
		struct sdadc_events *const	events
	)

inlinestatic

Enables an SDADC event input or output.

Enables one or more input or output events to or from the SDADC module. See sdadc_events for a list of events this module supports.

Note: Events cannot be altered while the module is enabled.

Parameters

[in]	module_inst	Software instance for the SDADC peripheral
[in]	events	Struct containing flags of events to enable

References Assert, sdadc_events::generate_event_on_conversion_done, and sdadc_events::generate_event_on_window_monitor.

static void sdadc_enable_interrupt	(	struct sdadc_module *const	module_inst,
		enum sdadc_interrupt_flag	interrupt
	)

inlinestatic

Enable interrupt.

Enable the given interrupt request from the SDADC module.

Parameters

[in]	module_inst	Pointer to the SDADC software instance struct
[in]	interrupt	Interrupt to enable

References Assert.

Referenced by sdadc_enable_callback(), and sdadc_read_buffer_job().

static void sdadc_flush ( struct sdadc_module *const module_inst )

inlinestatic

Flushes the SDADC pipeline.

Flushes the pipeline and restart the SDADC clock on the next peripheral clock edge. All conversions in progress will be lost. When flush is complete, the module will resume where it left off.

Parameters

[in] module_inst Pointer to the SDADC software instance struct

References Assert, and sdadc_is_syncing().

static void sdadc_get_config_defaults ( struct sdadc_config *const config )

inlinestatic

Initializes an SDADC configuration structure to defaults.

Initializes a given SDADC configuration struct to a set of known default values. This function should be called on any new instance of the configuration struct before being modified by the user application.

The default configuration is as follows:

GCLK generator 0 (GCLK main) clock source
Positive reference 1
Div 2 clock prescaler
Over Sampling Ratio is 64
Skip 0 samples
MUX input on SDADC AIN1
All events (input and generation) disabled
Free running disabled
Run in standby disabled
On command disabled
Disable all positive input in sequence
Window monitor disabled
No gain/offset/shift correction

Parameters

[out] config Pointer to configuration struct to initialize to default values

References Assert, sdadc_config::clock_prescaler, sdadc_config::clock_source, sdadc_config::correction, sdadc_config::event_action, sdadc_config::freerunning, sdadc_correction_config::gain_correction, GCLK_GENERATOR_0, sdadc_config::mux_input, sdadc_correction_config::offset_correction, sdadc_config::on_command, sdadc_reference::on_ref_buffer, sdadc_config::osr, sdadc_reference::ref_range, sdadc_reference::ref_sel, sdadc_config::reference, sdadc_config::run_in_standby, SDADC_EVENT_ACTION_DISABLED, SDADC_MUX_INPUT_AIN1, SDADC_OVER_SAMPLING_RATIO64, SDADC_REFERENCE_INTREF, SDADC_REFRANGE_0, SDADC_WINDOW_MODE_DISABLE, sdadc_config::seq_enable, sdadc_correction_config::shift_correction, sdadc_config::skip_count, sdadc_config::window, sdadc_window_config::window_lower_value, sdadc_window_config::window_mode, and sdadc_window_config::window_upper_value.

Referenced by configure_sdadc().

enum status_code sdadc_get_job_status	(	struct sdadc_module *	module_inst,
		enum sdadc_job_type	type
	)

Gets the status of a job.

Gets the status of an ongoing or the last job.

Parameters

[in]	module_inst	Pointer to the SDADC software instance struct
[in]	type	Type of job to abort

Returns: Status of the job.

References Assert, SDADC_JOB_READ_BUFFER, and STATUS_ERR_INVALID_ARG.

static bool sdadc_get_sequence_status	(	struct sdadc_module *const	module_inst,
		uint8_t *	seq_state
	)

inlinestatic

Get a module sequence flag.

Get the given status flag of the module.

Parameters

[in]	module_inst	Pointer to the SDADC software instance struct
[out]	seq_state	Identifies the last conversion done in the sequence

Returns: Status of the SDADC sequence conversion.

Return values

true	When the sequence start
false	When the last conversion in a sequence is done

References Assert.

static uint32_t sdadc_get_status ( struct sdadc_module *const module_inst )

inlinestatic

Retrieves the current module status.

Retrieves the status of the module, giving overall state information.

Parameters

[in] module_inst Pointer to the SDADC software instance struct

Returns: Bitmask of SDADC_STATUS_* flags.

Return values

SDADC_STATUS_RESULT_READY	SDADC result is ready to be read
SDADC_STATUS_WINDOW	SDADC has detected a value inside the set window range
SDADC_STATUS_OVERRUN	SDADC result has overrun

References Assert, SDADC_STATUS_OVERRUN, SDADC_STATUS_RESULT_READY, and SDADC_STATUS_WINDOW.

Referenced by sdadc_read().

enum status_code sdadc_init	(	struct sdadc_module *const	module_inst,
		Sdadc *	hw,
		struct sdadc_config *	config
	)

Initializes the SDADC.

Initializes the SDADC device struct and the hardware module based on the given configuration struct values.

Parameters

[out]	module_inst	Pointer to the SDADC software instance struct
[in]	hw	Pointer to the SDADC module instance
[in]	config	Pointer to the configuration struct

Returns: Status of the initialization procedure.

Return values

STATUS_OK	The initialization was successful
STATUS_ERR_INVALID_ARG	Invalid argument(s) were provided
STATUS_BUSY	The module is busy with a reset operation
STATUS_ERR_DENIED	The module is enabled

References _sdadc_instances, _sdadc_set_config(), Assert, sdadc_config::event_action, sdadc_config::freerunning, i, module_inst, NULL, sdadc_config::reference, SDADC_EVENT_ACTION_DISABLED, STATUS_BUSY, STATUS_ERR_DENIED, STATUS_OK, system_apb_clock_set_mask(), and SYSTEM_CLOCK_APB_APBC.

Referenced by configure_sdadc().

static bool sdadc_is_syncing ( struct sdadc_module *const module_inst )

inlinestatic

Determines if the hardware module(s) are currently synchronizing to the bus.

Checks to see if the underlying hardware peripheral module(s) are currently synchronizing across multiple clock domains to the hardware bus. This function can be used to delay further operations on a module until such time that it is ready, to prevent blocking delays for synchronization in the user application.

Parameters

[in] module_inst Pointer to the SDADC software instance struct

Returns: Synchronization status of the underlying hardware module(s).

Return values

true	If the module synchronization is ongoing
false	If the module has completed synchronization

References Assert.

Referenced by _sdadc_set_config(), sdadc_disable(), sdadc_enable(), sdadc_flush(), sdadc_reset(), sdadc_set_mux_input(), sdadc_set_window_mode(), and sdadc_start_conversion().

static enum status_code sdadc_read	(	struct sdadc_module *const	module_inst,
		int32_t *	result
	)

inlinestatic

Reads the SDADC result.

Reads the result from an SDADC conversion that was previously started.

Parameters

[in]	module_inst	Pointer to the SDADC software instance struct
[out]	result	Pointer to store the result value in

Returns: Status of the SDADC read request.

Return values

STATUS_OK	The result was retrieved successfully
STATUS_BUSY	A conversion result was not ready
STATUS_ERR_OVERFLOW	The result register has been overwritten by the SDADC module before the result was read by the software

References Assert, sdadc_clear_status(), sdadc_get_status(), SDADC_STATUS_OVERRUN, SDADC_STATUS_RESULT_READY, STATUS_BUSY, STATUS_ERR_OVERFLOW, and STATUS_OK.

Referenced by main().

enum status_code sdadc_read_buffer_job	(	struct sdadc_module *const	module_inst,
		int32_t *	buffer,
		uint16_t	samples
	)

Read multiple samples from SDADC.

Read samples from the SDADC into the buffer. If there is no hardware trigger defined (event action) the driver will retrigger the SDADC conversion whenever a conversion is complete until samples has been acquired. To avoid jitter in the sampling frequency using an event trigger is advised.

Parameters

[in]	module_inst	Pointer to the SDADC software instance struct
[in]	samples	Number of samples to acquire
[out]	buffer	Buffer to store the SDADC samples

Returns: Status of the job start.

Return values

STATUS_OK	The conversion job was started successfully and is in progress
STATUS_BUSY	The SDADC is already busy with another job

References Assert, buffer, sdadc_enable_interrupt(), SDADC_INTERRUPT_RESULT_READY, sdadc_start_conversion(), STATUS_BUSY, and STATUS_OK.

Referenced by main().

void sdadc_register_callback	(	struct sdadc_module *const	module,
		sdadc_callback_t	callback_func,
		enum sdadc_callback	callback_type
	)

Registers a callback.

Registers a callback function which is implemented by the user.

Note: The callback must be enabled by for the interrupt handler to call it when the condition for the callback is met.

Parameters

[in]	module	Pointer to SDADC software instance struct
[in]	callback_func	Pointer to callback function
[in]	callback_type	Callback type given by an enum

References Assert.

Referenced by configure_sdadc_callbacks().

static enum status_code sdadc_reset ( struct sdadc_module *const module_inst )

inlinestatic

Resets the SDADC module.

Resets an SDADC module, clearing all module state, and registers to their default values.

Parameters

[in] module_inst Pointer to the SDADC software instance struct

References Assert, sdadc_disable(), sdadc_is_syncing(), and STATUS_OK.

static void sdadc_set_mux_input	(	struct sdadc_module *const	module_inst,
		const enum sdadc_mux_input	mux_input
	)

inlinestatic

Sets MUX SDADC input pin.

Sets the MUX SDADC input pin selection.

Parameters

[in]	module_inst	Pointer to the SDADC software instance struct
[in]	mux_input	MUX input pin

References Assert, and sdadc_is_syncing().

static void sdadc_set_window_mode	(	struct sdadc_module *const	module_inst,
		const enum sdadc_window_mode	window_mode,
		const int16_t	window_lower_value,
		const int16_t	window_upper_value
	)

inlinestatic

Sets the SDADC window mode.

Sets the SDADC window mode to a given mode and value range.

Parameters

[in]	module_inst	Pointer to the SDADC software instance struct
[in]	window_mode	Window monitor mode to set
[in]	window_lower_value	Lower window monitor threshold value
[in]	window_upper_value	Upper window monitor threshold value

References Assert, and sdadc_is_syncing().

static void sdadc_start_conversion ( struct sdadc_module *const module_inst )

inlinestatic

Starts an SDADC conversion.

Starts a new SDADC conversion.

Parameters

[in] module_inst Pointer to the SDADC software instance struct

References Assert, and sdadc_is_syncing().

Referenced by _sdadc_interrupt_handler(), main(), and sdadc_read_buffer_job().

void sdadc_unregister_callback	(	struct sdadc_module *const	module,
		enum sdadc_callback	callback_type
	)

Unregisters a callback.

Unregisters a callback function which is implemented by the user.

Parameters

[in]	module	Pointer to SDADC software instance struct
[in]	callback_type	Callback type given by an enum

References Assert, and NULL.

Microchip® Advanced Software Framework

Prerequisites

Module Overview

Sample Clock

Gain and Offset Correction

Window Monitor

Events

Special Considerations

Extra Information

Examples

API Overview

Modules

Data Structures

Typedefs

Enumerations

Callback Management

Job Management

Module Status Flags

Driver Initialization and Configuration

Status Management

Enable, Disable, and Reset SDADC Module, Start Conversion and Read Result

Runtime Changes of SDADC Module

Enable and Disable Interrupts