SMART ARM-based Microcontrollers
AT12199: SAM C21 Sigma-Delta Analog-to-Digital
Converter (SDADC) Driver
APPLICATION NOTE
Introduction
®
®
This driver for Atmel | SMART ARM -based microcontrollers provides an
interface for the configuration and management of the device's SDADC
functionality.
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
•
Module Overview
•
Special Considerations
•
Extra Information
•
Examples
•
API Overview
Atmel-42496A-SAM-Sigma-Delta-Analog-to-Digital-Converter-(SDADC)-Driver_AT12199_Application Note-09/2015
Table of Contents
Introduction......................................................................................................................1
1. Software License....................................................................................................... 4
2. Prerequisites..............................................................................................................5
3. Module Overview....................................................................................................... 6
3.1.
3.2.
3.3.
3.4.
Sample Clock............................................................................................................................... 6
Gain and Offset Correction...........................................................................................................6
Window Monitor............................................................................................................................6
Events...........................................................................................................................................6
4. Special Considerations.............................................................................................. 8
5. Extra Information....................................................................................................... 9
6. Examples................................................................................................................. 10
7. API Overview........................................................................................................... 11
7.1.
7.2.
7.3.
7.4.
Variable and Type Definitions..................................................................................................... 11
7.1.1.
Type sdadc_callback_t.................................................................................................11
Structure Definitions................................................................................................................... 11
7.2.1.
Struct sdadc_config......................................................................................................11
7.2.2.
Struct sdadc_correction_config....................................................................................11
7.2.3.
Struct sdadc_events.................................................................................................... 12
7.2.4.
Struct sdadc_module................................................................................................... 12
7.2.5.
Struct sdadc_reference................................................................................................12
7.2.6.
Struct sdadc_window_config....................................................................................... 12
Macro Definitions........................................................................................................................13
7.3.1.
Module Status Flags.................................................................................................... 13
Function Definitions....................................................................................................................13
7.4.1.
7.4.2.
7.4.3.
7.4.4.
7.4.5.
7.5.
Driver Initialization and Configuration.......................................................................... 13
Status Management.....................................................................................................14
Enable, Disable, and Reset SDADC Module, Start Conversion and Read Result...... 16
Runtime Changes of SDADC Module..........................................................................19
Enable and Disable Interrupts..................................................................................... 20
7.4.6.
Callback Management................................................................................................. 20
7.4.7.
Job Management......................................................................................................... 22
Enumeration Definitions............................................................................................................. 23
7.5.1.
Enum sdadc_callback..................................................................................................23
7.5.2.
Enum sdadc_event_action.......................................................................................... 24
7.5.3.
Enum sdadc_interrupt_flag..........................................................................................24
7.5.4.
Enum sdadc_job_type................................................................................................. 24
7.5.5.
Enum sdadc_mux_input.............................................................................................. 24
7.5.6.
Enum sdadc_over_sampling_ratio.............................................................................. 25
7.5.7.
Enum sdadc_reference_range.................................................................................... 25
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7.5.8.
Enum sdadc_reference_select.................................................................................... 25
7.5.9.
Enum sdadc_window_mode........................................................................................26
8. Extra Information for SDADC Driver........................................................................ 27
8.1.
8.2.
8.3.
8.4.
Acronyms....................................................................................................................................27
Dependencies.............................................................................................................................27
Errata..........................................................................................................................................27
Module History............................................................................................................................27
9. Examples for SDADC Driver....................................................................................28
9.1.
9.2.
Quick Start Guide for SDADC - Basic........................................................................................ 28
9.1.1.
Setup........................................................................................................................... 28
9.1.2.
Use Case..................................................................................................................... 29
Quick Start Guide for SDADC - Callback................................................................................... 30
9.2.1.
Setup........................................................................................................................... 30
9.2.2.
Use Case..................................................................................................................... 32
10. Document Revision History..................................................................................... 34
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1.
Software License
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.
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2.
Prerequisites
There are no prerequisites for this module.
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3.
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.
3.1.
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:
22 + 3 × ���
������� =
���_�����_��
1.
2.
3.2.
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:
����
���� = ����0 + ������ × �����
2
3.3.
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.
3.4.
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
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•
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.
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4.
Special Considerations
There are no special considerations for this module.
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5.
Extra Information
For extra information see Extra Information for SDADC Driver. This includes:
•
Acronyms
•
Dependencies
•
Errata
•
Module History
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6.
Examples
For a list of examples related to this driver, see Examples for SDADC Driver.
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7.
API Overview
7.1.
Variable and Type Definitions
7.1.1.
Type sdadc_callback_t
typedef void(* sdadc_callback_t )(const struct sdadc_module *const module)
Type of the callback functions.
7.2.
Structure Definitions
7.2.1.
Struct sdadc_config
Configuration structure for an SDADC instance. This structure should be initialized by the
sdadc_get_config_defaults() function before being modified by the user application.
Table 7-1 Members
7.2.2.
Type
Name
Description
uint8_t
clock_prescaler Clock prescaler
enum gclk_generator
clock_source
GCLK generator used to clock the peripheral
struct sdadc_correction_config
correction
Gain and offset correction configuration structure
enum sdadc_event_action
event_action
Event action to take on incoming event
bool
freerunning
Enables free running mode if true
enum sdadc_mux_input
mux_input
MUX input
bool
on_command
Enables SDADC depend on other peripheral if true
enum sdadc_over_sampling_ratio osr
Over sampling ratio
struct sdadc_reference
reference
Voltage reference
bool
run_in_standby Enables SDADC in standby sleep mode if true
bool
seq_enable[]
Enables positive input in the sequence if true
uint8_t
skip_count
Skip Count
struct sdadc_window_config
window
Window monitor configuration structure
Struct sdadc_correction_config
Offset, gain, and shift correction configuration structure. Part of the sdadc_config struct will be initialized
by sdadc_get_config_defaults.
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Table 7-2 Members
7.2.3.
Type
Name
Description
uint16_t
gain_correction
Gain correction
int32_t
offset_correction
Offset correction
uint8_t
shift_correction
Shift correction
Struct sdadc_events
Event flags for the SDADC module. This is used to enable and disable events via sdadc_enable_events()
and sdadc_disable_events().
Table 7-3 Members
7.2.4.
Type
Name
Description
bool
generate_event_on_conversion_done
Enable event generation on conversion done
bool
generate_event_on_window_monitor
Enable event generation on window monitor
Struct sdadc_module
SDADC software instance structure, used to retain software state information of an associated hardware
module instance.
Note: The fields of this structure should not be altered by the user application; they are reserved for
module-internal use only.
7.2.5.
Struct sdadc_reference
Reference configuration structure.
Table 7-4 Members
7.2.6.
Type
Name
Description
bool
on_ref_buffer
Reference buffer turning switch
enum sdadc_reference_select
ref_range
Reference voltage range
enum sdadc_reference_select
ref_sel
Reference voltage selection
Struct sdadc_window_config
Window monitor configuration structure.
Table 7-5 Members
Type
Name
Description
int32_t
window_lower_value
Lower window value
enum sdadc_window_mode
window_mode
Selected window mode
int32_t
window_upper_value
Upper window value
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7.3.
Macro Definitions
7.3.1.
Module Status Flags
SDADC status flags, returned by sdadc_get_status() and cleared by sdadc_clear_status().
7.3.1.1.
Macro SDADC_STATUS_RESULT_READY
#define SDADC_STATUS_RESULT_READY
SDADC result ready.
7.3.1.2.
Macro SDADC_STATUS_OVERRUN
#define SDADC_STATUS_OVERRUN
SDADC result overwritten before read.
7.3.1.3.
Macro SDADC_STATUS_WINDOW
#define SDADC_STATUS_WINDOW
Window monitor match.
7.4.
Function Definitions
7.4.1.
Driver Initialization and Configuration
7.4.1.1.
Function sdadc_init()
Initializes the SDADC.
enum status_code sdadc_init(
struct sdadc_module *const module_inst,
Sdadc * hw,
struct sdadc_config * config)
Initializes the SDADC device struct and the hardware module based on the given configuration struct
values.
Table 7-6 Parameters
Data direction
Parameter name
Description
[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.
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Table 7-7 Return Values
7.4.1.2.
Return value
Description
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
Function sdadc_get_config_defaults()
Initializes an SDADC configuration structure to defaults.
void sdadc_get_config_defaults(
struct sdadc_config *const config)
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
Table 7-8 Parameters
Data direction
Parameter name
Description
[out]
config
Pointer to configuration struct to initialize to default values
7.4.2.
Status Management
7.4.2.1.
Function sdadc_get_status()
Retrieves the current module status.
uint32_t sdadc_get_status(
struct sdadc_module *const module_inst)
Retrieves the status of the module, giving overall state information.
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Table 7-9 Parameters
Data direction
Parameter name
Description
[in]
module_inst
Pointer to the SDADC software instance struct
Returns
Bitmask of SDADC_STATUS_* flags.
Table 7-10 Return Values
7.4.2.2.
Return value
Description
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
Function sdadc_clear_status()
Clears a module status flag.
void sdadc_clear_status(
struct sdadc_module *const module_inst,
const uint32_t status_flags)
Clears the given status flag of the module.
Table 7-11 Parameters
7.4.2.3.
Data direction
Parameter name
Description
[in]
module_inst
Pointer to the SDADC software instance struct
[in]
status_flags
Bitmask of SDADC_STATUS_* flags to clear
Function sdadc_get_sequence_status()
Get a module sequence flag.
bool sdadc_get_sequence_status(
struct sdadc_module *const module_inst,
uint8_t * seq_state)
Get the given status flag of the module.
Table 7-12 Parameters
Data direction
Parameter name
Description
[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.
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Table 7-13 Return Values
Return value
Description
true
When the sequence start
false
When the last conversion in a sequence is done
7.4.3.
Enable, Disable, and Reset SDADC Module, Start Conversion and Read Result
7.4.3.1.
Function sdadc_is_syncing()
Determines if the hardware module(s) are currently synchronizing to the bus.
bool sdadc_is_syncing(
struct sdadc_module *const module_inst)
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.
Table 7-14 Parameters
Data direction
Parameter name
Description
[in]
module_inst
Pointer to the SDADC software instance struct
Returns
Synchronization status of the underlying hardware module(s).
Table 7-15 Return Values
7.4.3.2.
Return value
Description
true
If the module synchronization is ongoing
false
If the module has completed synchronization
Function sdadc_enable()
Enables the SDADC module.
enum status_code sdadc_enable(
struct sdadc_module *const module_inst)
Enables an SDADC module that has previously been configured. If any internal reference is selected it
will be enabled.
Table 7-16 Parameters
Data direction
Parameter name
Description
[in]
module_inst
Pointer to the SDADC software instance struct
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7.4.3.3.
Function sdadc_disable()
Disables the SDADC module.
enum status_code sdadc_disable(
struct sdadc_module *const module_inst)
Disables an SDADC module that was previously enabled.
Table 7-17 Parameters
7.4.3.4.
Data direction
Parameter name
Description
[in]
module_inst
Pointer to the SDADC software instance struct
Function sdadc_reset()
Resets the SDADC module.
enum status_code sdadc_reset(
struct sdadc_module *const module_inst)
Resets an SDADC module, clearing all module state, and registers to their default values.
Table 7-18 Parameters
7.4.3.5.
Data direction
Parameter name
Description
[in]
module_inst
Pointer to the SDADC software instance struct
Function sdadc_enable_events()
Enables an SDADC event input or output.
void sdadc_enable_events(
struct sdadc_module *const module_inst,
struct sdadc_events *const events)
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.
Table 7-19 Parameters
7.4.3.6.
Data direction
Parameter name
Description
[in]
module_inst
Software instance for the SDADC peripheral
[in]
events
Struct containing flags of events to enable
Function sdadc_disable_events()
Disables an SDADC event input or output.
void sdadc_disable_events(
struct sdadc_module *const module_inst,
struct sdadc_events *const events)
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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.
Table 7-20 Parameters
7.4.3.7.
Data direction
Parameter name
Description
[in]
module_inst
Software instance for the SDADC peripheral
[in]
events
Struct containing flags of events to disable
Function sdadc_start_conversion()
Starts an SDADC conversion.
void sdadc_start_conversion(
struct sdadc_module *const module_inst)
Starts a new SDADC conversion.
Table 7-21 Parameters
7.4.3.8.
Data direction
Parameter name
Description
[in]
module_inst
Pointer to the SDADC software instance struct
Function sdadc_read()
Reads the SDADC result.
enum status_code sdadc_read(
struct sdadc_module *const module_inst,
int32_t * result)
Reads the result from an SDADC conversion that was previously started.
Table 7-22 Parameters
Data direction
Parameter name
Description
[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.
Table 7-23 Return Values
Return value
Description
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
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7.4.4.
Runtime Changes of SDADC Module
7.4.4.1.
Function sdadc_flush()
Flushes the SDADC pipeline.
void sdadc_flush(
struct sdadc_module *const module_inst)
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.
Table 7-24 Parameters
7.4.4.2.
Data direction
Parameter name
Description
[in]
module_inst
Pointer to the SDADC software instance struct
Function sdadc_set_window_mode()
Sets the SDADC window mode.
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 to a given mode and value range.
Table 7-25 Parameters
7.4.4.3.
Data direction
Parameter name
Description
[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
Function sdadc_set_mux_input()
Sets MUX SDADC input pin.
void sdadc_set_mux_input(
struct sdadc_module *const module_inst,
const enum sdadc_mux_input mux_input)
Sets the MUX SDADC input pin selection.
Table 7-26 Parameters
Data direction
Parameter name
Description
[in]
module_inst
Pointer to the SDADC software instance struct
[in]
mux_input
MUX input pin
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7.4.5.
Enable and Disable Interrupts
7.4.5.1.
Function sdadc_enable_interrupt()
Enable interrupt.
void sdadc_enable_interrupt(
struct sdadc_module *const module_inst,
enum sdadc_interrupt_flag interrupt)
Enable the given interrupt request from the SDADC module.
Table 7-27 Parameters
7.4.5.2.
Data direction
Parameter name
Description
[in]
module_inst
Pointer to the SDADC software instance struct
[in]
interrupt
Interrupt to enable
Function sdadc_disable_interrupt()
Disable interrupt.
void sdadc_disable_interrupt(
struct sdadc_module *const module_inst,
enum sdadc_interrupt_flag interrupt)
Disable the given interrupt request from the SDADC module.
Table 7-28 Parameters
Data direction
Parameter name
Description
[in]
module_inst
Pointer to the SDADC software instance struct
[in]
interrupt
Interrupt to disable
7.4.6.
Callback Management
7.4.6.1.
Function sdadc_register_callback()
Registers a callback.
void sdadc_register_callback(
struct sdadc_module *const module,
sdadc_callback_t callback_func,
enum sdadc_callback callback_type)
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.
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Table 7-29 Parameters
7.4.6.2.
Data direction
Parameter name
Description
[in]
module
Pointer to SDADC software instance struct
[in]
callback_func
Pointer to callback function
[in]
callback_type
Callback type given by an enum
Function sdadc_unregister_callback()
Unregisters a callback.
void sdadc_unregister_callback(
struct sdadc_module * module,
enum sdadc_callback callback_type)
Unregisters a callback function which is implemented by the user.
Table 7-30 Parameters
7.4.6.3.
Data direction
Parameter name
Description
[in]
module
Pointer to SDADC software instance struct
[in]
callback_type
Callback type given by an enum
Function sdadc_enable_callback()
Enables callback.
void sdadc_enable_callback(
struct sdadc_module *const module,
enum sdadc_callback callback_type)
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.
Table 7-31 Parameters
Data direction
Parameter name
Description
[in]
module
Pointer to SDADC software instance struct
[in]
callback_type
Callback type given by an enum
Returns
Status of the operation.
Table 7-32 Return Values
Return value
Description
STATUS_OK
If operation was completed
STATUS_ERR_INVALID
If operation was not completed, due to invalid callback_type
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7.4.6.4.
Function sdadc_disable_callback()
Disables callback.
void sdadc_disable_callback(
struct sdadc_module *const module,
enum sdadc_callback callback_type)
Disables the callback function registered by the sdadc_register_callback.
Table 7-33 Parameters
Data direction
Parameter name
Description
[in]
module
Pointer to SDADC software instance struct
[in]
callback_type
Callback type given by an enum
Returns
Status of the operation.
Table 7-34 Return Values
Return value
Description
STATUS_OK
If operation was completed
STATUS_ERR_INVALID
If operation was not completed, due to invalid callback_type
7.4.7.
Job Management
7.4.7.1.
Function sdadc_read_buffer_job()
Read multiple samples from SDADC.
enum status_code sdadc_read_buffer_job(
struct sdadc_module *const module_inst,
int32_t * buffer,
uint16_t samples)
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.
Table 7-35 Parameters
Data direction
Parameter name
Description
[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.
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Table 7-36 Return Values
7.4.7.2.
Return value
Description
STATUS_OK
The conversion job was started successfully and is in progress
STATUS_BUSY
The SDADC is already busy with another job
Function sdadc_get_job_status()
Gets the status of a job.
enum status_code sdadc_get_job_status(
struct sdadc_module * module_inst,
enum sdadc_job_type type)
Gets the status of an ongoing or the last job.
Table 7-37 Parameters
Data direction
Parameter name
Description
[in]
module_inst
Pointer to the SDADC software instance struct
[in]
type
Type of job to abort
Returns
Status of the job.
7.4.7.3.
Function sdadc_abort_job()
Aborts an ongoing job.
void sdadc_abort_job(
struct sdadc_module * module_inst,
enum sdadc_job_type type)
Aborts an ongoing job with given type.
Table 7-38 Parameters
Data direction
Parameter name
Description
[in]
module_inst
Pointer to the SDADC software instance struct
[in]
type
Type of job to abort
7.5.
Enumeration Definitions
7.5.1.
Enum sdadc_callback
Callback types for SDADC callback driver.
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Table 7-39 Members
7.5.2.
Enum value
Description
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
Enum for the possible actions to take on an incoming event.
Table 7-40 Members
7.5.3.
Enum value
Description
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.
Table 7-41 Members
7.5.4.
Enum value
Description
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.
Table 7-42 Members
7.5.5.
Enum value
Description
SDADC_JOB_READ_BUFFER
Asynchronous SDADC read into a user provided buffer
Enum sdadc_mux_input
Enum for the possible MUX input selections for the SDADC.
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Table 7-43 Members
7.5.6.
Enum value
Description
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
Enum for the over sampling ratio, which change the output data rate.
Table 7-44 Members
7.5.7.
Enum value
Description
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
Enum for the matched voltage range of the SDADC reference used.
Table 7-45 Members
7.5.8.
Enum value
Description
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
Enum for the possible reference voltages for the SDADC.
Table 7-46 Members
Enum value
Description
SDADC_REFERENCE_INTREF
Internal Bandgap Reference
SDADC_REFERENCE_AREFB
External reference B
SDADC_REFERENCE_DACOUT
DACOUT
SDADC_REFERENCE_INTVCC
VDDANA
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7.5.9.
Enum sdadc_window_mode
Enum for the possible window monitor modes for the SDADC.
Table 7-47 Members
Enum value
Description
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)
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8.
Extra Information for SDADC Driver
8.1.
Acronyms
Below is a table listing the acronyms used in this module, along with their intended meanings.
8.2.
Acronym
Description
SDADC
Sigma-Delta Analog-to-Digital Converter
OSR
Over Sampling Ratio
Dependencies
This driver has no dependencies.
8.3.
Errata
There are no errata related to this driver.
8.4.
Module History
An overview of the module history is presented in the table below, with details on the enhancements and
fixes made to the module since its first release. The current version of this corresponds to the newest
version in the table.
Changelog
Initial Release
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9.
Examples for SDADC Driver
This is a list of the available Quick Start guides (QSGs) and example applications for SAM Sigma-Delta
Analog-to-Digital Converter (SDADC) Driver. QSGs are simple examples with step-by-step instructions to
configure and use this driver in a selection of use cases. Note that a QSG can be compiled as a
standalone application or be added to the user application.
•
•
9.1.
Quick Start Guide for SDADC - Basic
Quick Start Guide for SDADC - Callback
Quick Start Guide for SDADC - Basic
In this use case, the SDADC will be configured with the following settings:
•
GCLK generator 0 (GCLK main) clock source
•
Internal bandgap reference 1V
•
Div 2 clock prescaler
•
Over Sampling Ratio is 64
•
Skip 2 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
9.1.1.
Setup
9.1.1.1.
Prerequisites
There are no special setup requirements for this use-case.
9.1.1.2.
Code
Add to the main application source file, outside of any functions:
struct sdadc_module sdadc_instance;
Copy-paste the following setup code to your user application:
void configure_sdadc(void)
{
struct sdadc_config config_sdadc;
sdadc_get_config_defaults(&config_sdadc);
sdadc_init(&sdadc_instance, SDADC, &config_sdadc);
}
sdadc_enable(&sdadc_instance);
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Add to user application initialization (typically the start of main()):
configure_sdadc();
9.1.1.3.
Workflow
1.
Create a module software instance structure for the SDADC module to store the SDADC driver
state while it is in use.
struct sdadc_module sdadc_instance;
2.
Note: This should never go out of scope as long as the module is in use. In most cases, this
should be global.
Configure the SDADC module.
•
Create a SDADC module configuration struct, which can be filled out to adjust the
configuration of a physical SDADC peripheral.
struct sdadc_config config_sdadc;
•
Initialize the SDADC configuration struct with the module's default values.
sdadc_get_config_defaults(&config_sdadc);
•
Note: This should always be performed before using the configuration struct to ensure that
all values are initialized to known default settings.
Set SDADC configurations.
sdadc_init(&sdadc_instance, SDADC, &config_sdadc);
•
Enable the SDADC module so that conversions can be made.
sdadc_enable(&sdadc_instance);
9.1.2.
Use Case
9.1.2.1.
Code
Copy-paste the following code to your user application:
sdadc_start_conversion(&sdadc_instance);
int32_t result;
do {
/* Wait for conversion to be done and read out result */
} while (sdadc_read(&sdadc_instance, &result) == STATUS_BUSY);
while (1) {
/* Infinite loop */
}
9.1.2.2.
Workflow
1.
Start conversion.
sdadc_start_conversion(&sdadc_instance);
2.
Wait until conversion is done and read result.
int32_t result;
do {
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/* Wait for conversion to be done and read out result */
} while (sdadc_read(&sdadc_instance, &result) == STATUS_BUSY);
3.
Enter an infinite loop once the conversion is complete.
while (1) {
/* Infinite loop */
}
9.2.
Quick Start Guide for SDADC - Callback
In this use case, the SDADC will convert 128 samples using interrupt driven conversion. When all
samples have been sampled, a callback will be called that signals the main application that conversion is
compete.
The SDADC will be set up as follows:
•
GCLK generator 0 (GCLK main) clock source
•
Internal bandgap reference 1V
•
Div 2 clock prescaler
•
Over Sampling Ratio is 1024
•
Skip 2 samples
•
MUX input on SDADC AIN2
•
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
9.2.1.
Setup
9.2.1.1.
Prerequisites
There are no special setup requirements for this use-case.
9.2.1.2.
Code
Add to the main application source file, outside of any functions:
struct sdadc_module sdadc_instance;
#define SDADC_SAMPLES 128
int32_t sdadc_result_buffer[SDADC_SAMPLES];
Callback function:
volatile bool sdadc_read_done = false;
void sdadc_complete_callback(
const struct sdadc_module *const module)
{
sdadc_read_done = true;
}
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Copy-paste the following setup code to your user application:
void configure_sdadc(void)
{
struct sdadc_config config_sdadc;
sdadc_get_config_defaults(&config_sdadc);
config_sdadc.clock_prescaler =
config_sdadc.reference.ref_sel
config_sdadc.osr
=
config_sdadc.mux_input
=
2;
= SDADC_REFERENCE_INTREF;
SDADC_OVER_SAMPLING_RATIO1024;
SDADC_MUX_INPUT_AIN2;
sdadc_init(&sdadc_instance, SDADC, &config_sdadc);
}
sdadc_enable(&sdadc_instance);
void configure_sdadc_callbacks(void)
{
sdadc_register_callback(&sdadc_instance,
sdadc_complete_callback, SDADC_CALLBACK_READ_BUFFER);
sdadc_enable_callback(&sdadc_instance, SDADC_CALLBACK_READ_BUFFER);
}
Add to user application initialization (typically the start of main()):
configure_sdadc();
configure_sdadc_callbacks();
9.2.1.3.
Workflow
1.
Create a module software instance structure for the SDADC module to store the SDADC driver
state while it is in use.
struct sdadc_module sdadc_instance;
2.
Note: This should never go out of scope as long as the module is in use. In most cases, this
should be global.
Create a buffer for the SDADC samples to be stored in by the driver asynchronously.
#define SDADC_SAMPLES 128
int32_t sdadc_result_buffer[SDADC_SAMPLES];
3.
Create a callback function that will be called each time the SDADC completes an asynchronous
read job.
volatile bool sdadc_read_done = false;
void sdadc_complete_callback(
const struct sdadc_module *const module)
{
sdadc_read_done = true;
}
4.
Configure the SDADC module.
•
Create a SDADC module configuration struct, which can be filled out to adjust the
configuration of a physical SDADC peripheral.
struct sdadc_config config_sdadc;
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•
Initialize the SDADC configuration struct with the module's default values.
sdadc_get_config_defaults(&config_sdadc);
•
Note: This should always be performed before using the configuration struct to ensure that
all values are initialized to known default settings.
Change the SDADC module configuration to suit the application.
config_sdadc.clock_prescaler =
config_sdadc.reference.ref_sel
config_sdadc.osr
=
config_sdadc.mux_input
=
•
2;
= SDADC_REFERENCE_INTREF;
SDADC_OVER_SAMPLING_RATIO1024;
SDADC_MUX_INPUT_AIN2;
Set SDADC configurations.
sdadc_init(&sdadc_instance, SDADC, &config_sdadc);
•
Enable the SDADC module so that conversions can be made.
sdadc_enable(&sdadc_instance);
5.
Register and enable the SDADC read buffer complete callback handler.
•
Register the user-provided read buffer complete callback function with the driver, so that it will
be run when an asynchronous buffer read job completes.
sdadc_register_callback(&sdadc_instance,
sdadc_complete_callback, SDADC_CALLBACK_READ_BUFFER);
•
Enable the read buffer complete callback so that it will generate callbacks.
sdadc_enable_callback(&sdadc_instance,
SDADC_CALLBACK_READ_BUFFER);
9.2.2.
Use Case
9.2.2.1.
Code
Copy-paste the following code to your user application:
system_interrupt_enable_global();
sdadc_read_buffer_job(&sdadc_instance, sdadc_result_buffer, SDADC_SAMPLES);
while (sdadc_read_done == false) {
/* Wait for asynchronous SDADC read to complete */
}
while (1) {
/* Infinite loop */
}
9.2.2.2.
Workflow
•
Enable global interrupts, so that callbacks can be generated by the driver.
system_interrupt_enable_global();
•
Start an asynchronous SDADC conversion, to store SDADC samples into the global buffer and
generate a callback when complete.
sdadc_read_buffer_job(&sdadc_instance, sdadc_result_buffer,
SDADC_SAMPLES);
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•
Wait until the asynchronous conversion is complete.
while (sdadc_read_done == false) {
/* Wait for asynchronous SDADC read to complete */
}
•
Enter an infinite loop once the conversion is complete.
while (1) {
/* Infinite loop */
}
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10.
Document Revision History
Doc. Rev.
Date
Comments
42496A
09/2015
Initial document release
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