Functions
fsp_err_t	R_SDADC_Open (adc_ctrl_t p_ctrl, adc_cfg_t const const p_cfg)

fsp_err_t	R_SDADC_ScanCfg (adc_ctrl_t p_ctrl, void const const p_extend)

fsp_err_t	R_SDADC_InfoGet (adc_ctrl_t p_ctrl, adc_info_t p_adc_info)

fsp_err_t	R_SDADC_ScanStart (adc_ctrl_t *p_ctrl)

fsp_err_t	R_SDADC_ScanGroupStart (adc_ctrl_t *p_ctrl, adc_group_mask_t group_id)

fsp_err_t	R_SDADC_ScanStop (adc_ctrl_t *p_ctrl)

fsp_err_t	R_SDADC_StatusGet (adc_ctrl_t p_ctrl, adc_status_t p_status)

fsp_err_t	R_SDADC_Read (adc_ctrl_t p_ctrl, adc_channel_t const reg_id, uint16_t const p_data)

fsp_err_t	R_SDADC_Read32 (adc_ctrl_t p_ctrl, adc_channel_t const reg_id, uint32_t const p_data)

fsp_err_t	R_SDADC_OffsetSet (adc_ctrl_t *const p_ctrl, adc_channel_t const reg_id, int32_t const offset)

fsp_err_t	R_SDADC_Calibrate (adc_ctrl_t const p_ctrl, void const p_extend)

fsp_err_t	R_SDADC_Close (adc_ctrl_t *p_ctrl)

Detailed Description

Driver for the SDADC24 peripheral on RA MCUs. This module implements the ADC Interface.

Overview

Features

The SDADC module supports the following features:

24 bit maximum resolution
Configure scans to include:
- Multiple analog channels
- Outputs of OPAMP0 (P side) and OPAMP1 (N side) of SDADC channel 4
Configurable scan start trigger:
- Software scan triggers
- Hardware scan triggers (timer expiration, for example)
Configurable scan mode:
- Single scan mode, where each trigger starts a single scan
- Continuous scan mode, where all channels are scanned continuously
Supports averaging converted samples
Optional callback when single conversion, entire scan, or calibration completes
Supports reading converted data
Sample and hold support

Selecting an ADC

All RA MCUs have an ADC (r_adc). Only select RA MCUs have an SDADC. When selecting between them, consider these factors. Refer to the hardware manual for details.

	ADC	SDADC
Availability	Available on all RA MCUs.	Available on select RA MCUs.
Resolution	The ADC has a maximum resolution of 12, 14, or 16 bits depending on the MCU.	The SDADC has a maximum accuracy of 24 bits.
Number of Channels	The ADC has more channels than the SDADC.	The SDADC 5 channels, one of which is tied to OPAMP0 and OPAMP1.
Frequency	The ADC sampling time is shorter (more samples per second).	The SDADC sampling time is longer (fewer samples per second).
Settling Time	The ADC does not have a settling time when switching between channels.	The SDADC requires a settling time when switching between channels.

Configuration

Build Time Configurations for r_sdadc

The following build time configurations are defined in fsp_cfg/r_sdadc_cfg.h:

Configuration	Options	Default	Description
Parameter Checking	Default (BSP) Enabled Disabled	Default (BSP)	If selected code for parameter checking is included in the build.

Configurations for Analog > ADC (r_sdadc)

This module can be added to the Stacks tab via New Stack > Analog > ADC (r_sdadc).

Configuration	Options	Default	Description
Name	Name must be a valid C symbol	g_adc0	Module name.
Mode	Single Scan Continuous Scan	Continuous Scan	In single scan mode, all channels are converted once per start trigger, and conversion stops after all enabled channels are scanned. In continuous scan mode, conversion starts after a start trigger, then continues until stopped in software.
Resolution	16 Bit 24 Bit	24 Bit	Select 24-bit or 16-bit resolution.
Alignment	Right Left	Right	Select left or right alignment.
Trigger	MCU Specific Options		Select conversion start trigger. Conversion can be started in software, or conversion can be started when a hardware event occurs if the hardware event is linked to the SDADC peripheral using the ELC API.
Vref Source	Internal External	Internal	Vref can be source internally and output on the SBIAS pin, or Vref can be input from VREFI.
Vref Voltage	0.8 V 1.0 V 1.2 V 1.4 V 1.6 V 1.8 V 2.0 V 2.2 V 2.4 V	1.0 V	Select Vref voltage. If Vref is input externally, the voltage on VREFI must match the voltage selected within 3%.
Callback	Name must be a valid C symbol	NULL	Enter the name of the callback function to be called when conversion completes or a scan ends.
Conversion End Interrupt Priority	MCU Specific Options		[Required] Select the interrupt priority for the conversion end interrupt.
Scan End Interrupt Priority	MCU Specific Options		[Optional] Select the interrupt priority for the scan end interrupt.
Calibration End Interrupt Priority	MCU Specific Options		[Optional] Select the interrupt priority for the calibration end interrupt.

Configurations for Analog > SDADC Channel Configuration (r_sdadc)

Configuration	Options	Default	Description
Input	Differential Single Ended	Differential	Select differential or single-ended input.
Stage 1 Gain	1 2 3 4 8	1	Select the gain for stage 1 of the PGA. Must be 1 for single-ended input.
Stage 2 Gain	1 2 4 8	1	Select the gain for stage 2 of the PGA. Must be 1 for single-ended input.
Oversampling Ratio	64 128 256 512 1024 2048	256	Select the oversampling ratio for the PGA. Must be 256 for single-ended input.
Polarity (Valid for Single-Ended Input Only)	Positive Negative	Positive	Select positive or negative polarity for single-ended input. VBIAS (1.0 V typical) is connected on the opposite input.
Conversions to Average per Result	Do Not Average (Interrupt after Each Conversion) Average 8 Average 16 Average 32 Average 64	Do Not Average (Interrupt after Each Conversion)	Select the number of conversions to average for each result. The ADC_EVENT_CONVERSION_END event occurs after each average, or after each individual conversion if averaging is disabled.
Invert (Valid for Negative Single-Ended Input Only)	Result Not Inverted Result Inverted	Result Not Inverted	Select whether to invert negative single-ended input. When the result is inverted, the lowest measurable voltage gives a result of 0, and the highest measurable voltage gives a result of 2^resolution - 1.
Number of Conversions Per Scan	Refer to the RA Configuration tool for available options.	1	Number of conversions on this channel before AUTOSCAN moves to the next channel. When all conversions of all channels are complete, the ADC_EVENT_SCAN_END event occurs.

Clock Configuration

The SDADC clock clock is configurable on the clocks tab.

The SDADC clock must be 4 MHz when the SDADC is used.

Pin Configuration

The ANSDnP (n = 0-3) pins are analog input channels that can be used with the SDADC.

Usage Notes

Scan Procedure

In this document, the term "scan" refers to the AUTOSCAN feature of the SDADC, which works as follows:

Conversions are performed on enabled channels in ascending order of channel number. All conversions required for a single channel are completed before the sequencer moves to the next channel.
Conversions are performed at the rate (in Hz) of the SDADC oversampling clock frequency / oversampling ratio (configured per channel). FSP uses the normal mode SDADC oversampling clock frequency.
If averaging is enabled for the channel, the number of conversions to average are performed before each conversion end interrupt occurs.
If the number of conversions for the channel is more than 1, SDADC performs the number of conversions requested. These are performed consecutively. There is a settling time associated with switching channels. Performing all of the requested conversions for each channel at a time avoids this settling time after the first conversion.

If averaging is enabled for the channel, each averaged result counts as a single conversion.
Continues to the next enabled channel only after completing all conversions requested.
After all enabled channels are scanned, a scan end interrupt occurs. The driver supports single-scan and continuous scan operation modes.
- Single-scan mode performs one scan per trigger (hardware trigger or software start using R_SDADC_ScanStart).
- In continuous scan mode, the scan is restarted after each scan completes. A single trigger is required to start continuous operation of the SDADC.

When Interrupts Are Not Enabled

If interrupts are not enabled, the R_SDADC_StatusGet() API can be used to poll the SDADC to determine when the scan has completed. The R_SDADC_Read() API function is used to access the converted SDADC result. This applies to both normal scans and calibration scans.

Calibration

Calibration is required to use the SDADC if any channel is configured for differential mode. Call R_SDADC_Calibrate() after open, and prior to any other function, then wait for a calibration complete event before using the SDADC. R_SDADC_Calibrate() should not be called if all channels are configured for single-ended mode.

Examples

Basic Example

This is a basic example of minimal use of the SDADC in an application.

void sdadc_basic_example (void)
{
    fsp_err_t err = FSP_SUCCESS;
    /* Initializes the module. */
    err = R_SDADC_Open(&g_adc0_ctrl, &g_adc0_cfg);
    /* Handle any errors. This function should be defined by the user. */
    assert(FSP_SUCCESS == err);
    /* Calibrate all differential channels. */
    sdadc_calibrate_args_t calibrate_args;
    calibrate_args.mode    = SDADC_CALIBRATION_INTERNAL_GAIN_OFFSET;
    calibrate_args.channel = ADC_CHANNEL_0;
    err = R_SDADC_Calibrate(&g_adc0_ctrl, &calibrate_args);
    assert(FSP_SUCCESS == err);
    /* Wait for calibration to complete. */
    adc_status_t status;
    status.state = ADC_STATE_SCAN_IN_PROGRESS;
    while (ADC_STATE_SCAN_IN_PROGRESS == status.state)
    {
        R_SDADC_StatusGet(&g_adc0_ctrl, &status);
    }
    /* In software trigger mode, start a scan by calling R_SDADC_ScanStart(). In other modes, enable external
     * triggers by calling R_SDADC_ScanStart(). */
    (void) R_SDADC_ScanStart(&g_adc0_ctrl);
    /* Wait for conversion to complete. */
    status.state = ADC_STATE_SCAN_IN_PROGRESS;
    while (ADC_STATE_SCAN_IN_PROGRESS == status.state)
    {
        R_SDADC_StatusGet(&g_adc0_ctrl, &status);
    }
    /* Read converted data. */
    uint32_t channel1_conversion_result;
    R_SDADC_Read32(&g_adc0_ctrl, ADC_CHANNEL_1, &channel1_conversion_result);
}

Using DTC or DMAC with the SDADC

If desired, the DTC or DMAC can be used to store each conversion result in a circular buffer. An example configuration is below.

/* Example DTC transfer settings to used with SDADC. */
/* The transfer length should match the total number of conversions per scan. This example assumes the SDADC is
 * configured to scan channel 1 three times, then channel 2 and channel 4 once, for a total of 5 conversions. */
#define SDADC_EXAMPLE_TRANSFER_LENGTH    (5)
uint32_t g_sdadc_example_buffer[SDADC_EXAMPLE_TRANSFER_LENGTH];
transfer_info_t g_sdadc_transfer_info DTC_TRANSFER_INFO_ALIGNMENT =
{
    .transfer_settings_word_b.dest_addr_mode = TRANSFER_ADDR_MODE_INCREMENTED,
    .transfer_settings_word_b.repeat_area    = TRANSFER_REPEAT_AREA_DESTINATION,
    .transfer_settings_word_b.irq            = TRANSFER_IRQ_END,
    .transfer_settings_word_b.chain_mode     = TRANSFER_CHAIN_MODE_DISABLED,
    .transfer_settings_word_b.src_addr_mode  = TRANSFER_ADDR_MODE_FIXED,
    .transfer_settings_word_b.mode           = TRANSFER_MODE_REPEAT,
    /* NOTE: The data transferred will contain a 24-bit converted value in bits 23:0. Bit 24 contains a status flag
     * indicating if the result overflowed or not. Bits 27:25 contain the channel number + 1. The settings for
     * resolution and alignment and ignored when DTC or DMAC is used. */
    .transfer_settings_word_b.size           = TRANSFER_SIZE_4_BYTE,
    /* NOTE: It is strongly recommended to enable averaging on all channels or no channels when using DTC with SDADC
     * because the result register is different when averaging is used. If averaging is enabled on all channels,
     * set transfer_info_t::p_src to &R_SDADC->ADAR. */
    .p_src  = (void const *) &R_SDADC0->ADCR,
    .p_dest = &g_sdadc_example_buffer[0],
    .length = SDADC_EXAMPLE_TRANSFER_LENGTH,
};
void sdadc_dtc_example (void)
{
    fsp_err_t err = FSP_SUCCESS;
    /* Initializes the module. */
    err = R_SDADC_Open(&g_adc0_ctrl, &g_adc0_cfg);
    /* Handle any errors. This function should be defined by the user. */
    assert(FSP_SUCCESS == err);
    /* Calibrate all differential channels. */
    sdadc_calibrate_args_t calibrate_args;
    calibrate_args.mode    = SDADC_CALIBRATION_INTERNAL_GAIN_OFFSET;
    calibrate_args.channel = ADC_CHANNEL_0;
    err = R_SDADC_Calibrate(&g_adc0_ctrl, &calibrate_args);
    assert(FSP_SUCCESS == err);
    /* Wait for calibration to complete. */
    adc_status_t status;
    status.state = ADC_STATE_SCAN_IN_PROGRESS;
    while (ADC_STATE_SCAN_IN_PROGRESS == status.state)
    {
        R_SDADC_StatusGet(&g_adc0_ctrl, &status);
    }
    /* In software trigger mode, start a scan by calling R_SDADC_ScanStart(). In other modes, enable external
     * triggers by calling R_SDADC_ScanStart(). */
    (void) R_SDADC_ScanStart(&g_adc0_ctrl);
    /* After each conversion, the converted data is transferred to the next index in g_sdadc_example_buffer. After
     * the entire scan completes, the index in g_sdadc_example_buffer resets. The data in g_sdadc_example_buffer
     * is:
     *  - g_sdadc_example_buffer[0] = SDADC channel 1 conversion 0
     *  - g_sdadc_example_buffer[1] = SDADC channel 1 conversion 1
     *  - g_sdadc_example_buffer[2] = SDADC channel 1 conversion 2
     *  - g_sdadc_example_buffer[3] = SDADC channel 2 conversion 0
     *  - g_sdadc_example_buffer[4] = SDADC channel 4 conversion 0
     *//* At any point in the application after the first scan completes, the most recent data for channel 2 can be read
     * from the buffer like this. Shifting removes the unrelated bits in the result register and propagates the sign
     * bit so the value can be interpreted as a signed result. This assumes channel 2 is configured in differential
     * mode. */
    int32_t channel_2_data = (int32_t) (g_sdadc_example_buffer[3] << 8) >> 8;
    FSP_PARAMETER_NOT_USED(channel_2_data);
}

Data Structures
struct	sdadc_calibrate_args_t

struct	sdadc_channel_cfg_t

struct	sdadc_scan_cfg_t

struct	sdadc_extended_cfg_t

struct	sdadc_instance_ctrl_t

Enumerations
enum	sdadc_vref_src_t

enum	sdadc_vref_voltage_t

enum	sdadc_channel_input_t

enum	sdadc_channel_stage_1_gain_t

enum	sdadc_channel_stage_2_gain_t

enum	sdadc_channel_oversampling_t

enum	sdadc_channel_polarity_t

enum	sdadc_channel_average_t

enum	sdadc_channel_inversion_t

enum	sdadc_channel_count_formula_t

enum	sdadc_calibration_t

Data Structure Documentation

◆ sdadc_calibrate_args_t

struct sdadc_calibrate_args_t

Structure to pass to the adc_api_t::calibrate p_extend argument.

Data Fields
adc_channel_t	channel	Which channel to calibrate.
sdadc_calibration_t	mode	Calibration mode.

◆ sdadc_channel_cfg_t

struct sdadc_channel_cfg_t

SDADC per channel configuration.

◆ sdadc_scan_cfg_t

struct sdadc_scan_cfg_t

SDADC active channel configuration

Data Fields
uint32_t	scan_mask	Channels/bits: bit 0 is ch0; bit 15 is ch15.

◆ sdadc_extended_cfg_t

struct sdadc_extended_cfg_t

SDADC configuration extension. This extension is required and must be provided in adc_cfg_t::p_extend.

Data Fields
uint8_t	conv_end_ipl	Conversion end interrupt priority.
IRQn_Type	conv_end_irq
sdadc_vref_src_t	vref_src	Source of Vref (internal or external)
sdadc_vref_voltage_t	vref_voltage	Voltage of Vref, required for both internal and external Vref. If Vref is from an external source, the voltage must match the specified voltage within 3%.
sdadc_channel_cfg_t const *	p_channel_cfgs[SDADC_MAX_NUM_CHANNELS]	Configuration for each channel, set to NULL if unused.

◆ sdadc_instance_ctrl_t

struct sdadc_instance_ctrl_t

ADC instance control block. DO NOT INITIALIZE. Initialized in adc_api_t::open().

Enumeration Type Documentation

◆ sdadc_vref_src_t

enum sdadc_vref_src_t

Source of Vref.

Enumerator
SDADC_VREF_SRC_INTERNAL	Vref is internally sourced, can be output as SBIAS.
SDADC_VREF_SRC_EXTERNAL	Vref is externally sourced from the VREFI pin.

◆ sdadc_vref_voltage_t

enum sdadc_vref_voltage_t

Voltage of Vref.

Enumerator
SDADC_VREF_VOLTAGE_800_MV	Vref is 0.8 V.
SDADC_VREF_VOLTAGE_1000_MV	Vref is 1.0 V.
SDADC_VREF_VOLTAGE_1200_MV	Vref is 1.2 V.
SDADC_VREF_VOLTAGE_1400_MV	Vref is 1.4 V.
SDADC_VREF_VOLTAGE_1600_MV	Vref is 1.6 V.
SDADC_VREF_VOLTAGE_1800_MV	Vref is 1.8 V.
SDADC_VREF_VOLTAGE_2000_MV	Vref is 2.0 V.
SDADC_VREF_VOLTAGE_2200_MV	Vref is 2.2 V.
SDADC_VREF_VOLTAGE_2400_MV	Vref is 2.4 V (only valid for external Vref)

◆ sdadc_channel_input_t

enum sdadc_channel_input_t

Per channel input mode.

Enumerator
SDADC_CHANNEL_INPUT_DIFFERENTIAL	Differential input.
SDADC_CHANNEL_INPUT_SINGLE_ENDED	Single-ended input.

◆ sdadc_channel_stage_1_gain_t

enum sdadc_channel_stage_1_gain_t

Per channel stage 1 gain options.

Enumerator
SDADC_CHANNEL_STAGE_1_GAIN_1	Gain of 1.
SDADC_CHANNEL_STAGE_1_GAIN_2	Gain of 2.
SDADC_CHANNEL_STAGE_1_GAIN_3	Gain of 3 (only valid for stage 1)
SDADC_CHANNEL_STAGE_1_GAIN_4	Gain of 4.
SDADC_CHANNEL_STAGE_1_GAIN_8	Gain of 8.

◆ sdadc_channel_stage_2_gain_t

enum sdadc_channel_stage_2_gain_t

Per channel stage 2 gain options.

Enumerator
SDADC_CHANNEL_STAGE_2_GAIN_1	Gain of 1.
SDADC_CHANNEL_STAGE_2_GAIN_2	Gain of 2.
SDADC_CHANNEL_STAGE_2_GAIN_4	Gain of 4.
SDADC_CHANNEL_STAGE_2_GAIN_8	Gain of 8.

◆ sdadc_channel_oversampling_t

enum sdadc_channel_oversampling_t

Per channel oversampling ratio.

Enumerator
SDADC_CHANNEL_OVERSAMPLING_64	Oversampling ratio of 64.
SDADC_CHANNEL_OVERSAMPLING_128	Oversampling ratio of 128.
SDADC_CHANNEL_OVERSAMPLING_256	Oversampling ratio of 256.
SDADC_CHANNEL_OVERSAMPLING_512	Oversampling ratio of 512.
SDADC_CHANNEL_OVERSAMPLING_1024	Oversampling ratio of 1024.
SDADC_CHANNEL_OVERSAMPLING_2048	Oversampling ratio of 2048.

◆ sdadc_channel_polarity_t

enum sdadc_channel_polarity_t

Per channel polarity, valid for single-ended input only.

Enumerator
SDADC_CHANNEL_POLARITY_POSITIVE	Positive-side single-ended input.
SDADC_CHANNEL_POLARITY_NEGATIVE	Negative-side single-ended input.

◆ sdadc_channel_average_t

enum sdadc_channel_average_t

Per channel number of conversions to average before conversion end callback.

Enumerator
SDADC_CHANNEL_AVERAGE_NONE	Do not average (callback for each conversion)
SDADC_CHANNEL_AVERAGE_8	Average 8 samples for each conversion end callback.
SDADC_CHANNEL_AVERAGE_16	Average 16 samples for each conversion end callback.
SDADC_CHANNEL_AVERAGE_32	Average 32 samples for each conversion end callback.
SDADC_CHANNEL_AVERAGE_64	Average 64 samples for each conversion end callback.

◆ sdadc_channel_inversion_t

enum sdadc_channel_inversion_t

Per channel polarity, valid for negative-side single-ended input only.

Enumerator
SDADC_CHANNEL_INVERSION_OFF	Do not invert conversion result.
SDADC_CHANNEL_INVERSION_ON	Invert conversion result.

◆ sdadc_channel_count_formula_t

enum sdadc_channel_count_formula_t

Select a formula to specify the number of conversions. The following symbols are used in the formulas:

N: Number of conversions
n: sdadc_channel_cfg_t::coefficient_n, do not set to 0 if m is 0
m: sdadc_channel_cfg_t::coefficient_m, do not set to 0 if n is 0

Either m or n must be non-zero.

Enumerator
SDADC_CHANNEL_COUNT_FORMULA_EXPONENTIAL	N = 32 * (2 ^ n - 1) + m * 2 ^ n.
SDADC_CHANNEL_COUNT_FORMULA_LINEAR	N = (32 * n) + m.

◆ sdadc_calibration_t

enum sdadc_calibration_t

Calibration mode.

Enumerator
SDADC_CALIBRATION_INTERNAL_GAIN_OFFSET	Use internal reference to calibrate offset and gain.
SDADC_CALIBRATION_EXTERNAL_OFFSET	Use external reference to calibrate offset.
SDADC_CALIBRATION_EXTERNAL_GAIN	Use external reference to calibrate gain.

Function Documentation

◆ R_SDADC_Open()

fsp_err_t R_SDADC_Open	(	adc_ctrl_t *	p_ctrl,
		adc_cfg_t const *const	p_cfg
	)

Applies power to the SDADC and initializes the hardware based on the user configuration. As part of this initialization, the SDADC clock is configured and enabled. If an interrupt priority is non-zero, enables an interrupt which will call a callback to notify the user when a conversion, scan, or calibration is complete. R_SDADC_Calibrate() must be called after this function before using the SDADC if any channels are used in differential mode. Implements adc_api_t::open().

Note: This function delays at least 2 ms as required by the SDADC power on procedure.

Return values

FSP_SUCCESS	Configuration successful.
FSP_ERR_ASSERTION	An input pointer is NULL or an input parameter is invalid.
FSP_ERR_ALREADY_OPEN	Control block is already open.
FSP_ERR_IRQ_BSP_DISABLED	A required interrupt is disabled

◆ R_SDADC_ScanCfg()

fsp_err_t R_SDADC_ScanCfg	(	adc_ctrl_t *	p_ctrl,
		void const *const	p_extend
	)

Configures the enabled channels of the ADC. Pass a pointer to sdadc_scan_cfg_t to p_extend. Implements adc_api_t::scanCfg().

Return values

FSP_SUCCESS	Information stored in p_adc_info.
FSP_ERR_ASSERTION	An input pointer is NULL or an input parameter is invalid.
FSP_ERR_NOT_OPEN	Instance control block is not open.

◆ R_SDADC_InfoGet()

fsp_err_t R_SDADC_InfoGet	(	adc_ctrl_t *	p_ctrl,
		adc_info_t *	p_adc_info
	)

Returns the address of the lowest number configured channel, the total number of results to be read in order to read the results of all configured channels, the size of each result, and the ELC event enumerations. Implements adc_api_t::infoGet().

Return values

FSP_SUCCESS	Information stored in p_adc_info.
FSP_ERR_ASSERTION	An input pointer was NULL.
FSP_ERR_NOT_OPEN	Instance control block is not open.

◆ R_SDADC_ScanStart()

fsp_err_t R_SDADC_ScanStart ( adc_ctrl_t * p_ctrl )

If the SDADC is configured for hardware triggers, enables hardware triggers. Otherwise, starts a scan. Implements adc_api_t::scanStart().

Return values

FSP_SUCCESS	Scan started or hardware triggers enabled successfully.
FSP_ERR_ASSERTION	An input pointer was NULL.
FSP_ERR_NOT_OPEN	Instance control block is not open.
FSP_ERR_IN_USE	A conversion or calibration is in progress.

◆ R_SDADC_ScanGroupStart()

fsp_err_t R_SDADC_ScanGroupStart	(	adc_ctrl_t *	p_ctrl,
		adc_group_mask_t	group_id
	)

adc_api_t::scanStart is not supported on the SDADC. Use scanStart instead.

Return values

FSP_ERR_UNSUPPORTED Function not supported in this implementation.

◆ R_SDADC_ScanStop()

fsp_err_t R_SDADC_ScanStop ( adc_ctrl_t * p_ctrl )

If the SDADC is configured for hardware triggers, disables hardware triggers. Otherwise, stops any in-progress scan started by software. Implements adc_api_t::scanStop().

Return values

FSP_SUCCESS	Scan stopped or hardware triggers disabled successfully.
FSP_ERR_ASSERTION	An input pointer was NULL.
FSP_ERR_NOT_OPEN	Instance control block is not open.

◆ R_SDADC_StatusGet()

fsp_err_t R_SDADC_StatusGet	(	adc_ctrl_t *	p_ctrl,
		adc_status_t *	p_status
	)

Returns the status of a scan started by software, including calibration scans. It is not possible to determine the status of a scan started by a hardware trigger. Implements adc_api_t::scanStatusGet().

Return values

FSP_SUCCESS	No software scan or calibration is in progress.
FSP_ERR_ASSERTION	An input pointer was NULL.
FSP_ERR_NOT_OPEN	Instance control block is not open.

◆ R_SDADC_Read()

fsp_err_t R_SDADC_Read	(	adc_ctrl_t *	p_ctrl,
		adc_channel_t const	reg_id,
		uint16_t *const	p_data
	)

Reads the most recent conversion result from a channel. Truncates 24-bit results to the upper 16 bits. Implements adc_api_t::read().

Note: The result stored in p_data is signed when the SDADC channel is configured in differential mode.; Do not use this API if the conversion end interrupt (SDADC0_ADI) is used to trigger the DTC unless the interrupt mode is set to TRANSFER_IRQ_EACH.

Return values

FSP_SUCCESS	Conversion result in p_data.
FSP_ERR_ASSERTION	An input pointer was NULL or an input parameter was invalid.
FSP_ERR_NOT_OPEN	Instance control block is not open.

◆ R_SDADC_Read32()

fsp_err_t R_SDADC_Read32	(	adc_ctrl_t *	p_ctrl,
		adc_channel_t const	reg_id,
		uint32_t *const	p_data
	)

Reads the most recent conversion result from a channel. Implements adc_api_t::read32().

Note: The result stored in p_data is signed when the SDADC channel is configured in differential mode. When the SDADC is configured for 24-bit resolution and right alignment, the sign bit is bit 23, and the upper 8 bits are 0. When the SDADC is configured for 16-bit resolution and right alignment, the sign bit is bit 15, and the upper 16 bits are 0.; Do not use this API if the conversion end interrupt (SDADC0_ADI) is used to trigger the DTC unless the interrupt mode is set to TRANSFER_IRQ_EACH.

Return values

FSP_SUCCESS	Conversion result in p_data.
FSP_ERR_ASSERTION	An input pointer was NULL or an input parameter was invalid.
FSP_ERR_NOT_OPEN	Instance control block is not open.

◆ R_SDADC_OffsetSet()

fsp_err_t R_SDADC_OffsetSet	(	adc_ctrl_t *const	p_ctrl,
		adc_channel_t const	reg_id,
		int32_t const	offset
	)

Sets the offset. Offset is applied after stage 1 of the input channel. Offset can only be applied when the channel is configured for differential input. Implements adc_api_t::offsetSet().

Note: The offset is cleared if adc_api_t::calibrate() is called. The offset can be re-applied if necessary after the the callback with event ADC_EVENT_CALIBRATION_COMPLETE is called.

Parameters

[in]	p_ctrl	See p_instance_ctrl in adc_api_t::offsetSet().
[in]	reg_id	See reg_id in adc_api_t::offsetSet().
[in]	offset	Must be between -15 and 15, offset (mV) = 10.9376 mV * offset_steps / stage 1 gain.

Return values

FSP_SUCCESS	Offset updated successfully.
FSP_ERR_ASSERTION	An input pointer was NULL or an input parameter was invalid.
FSP_ERR_IN_USE	A conversion or calibration is in progress.
FSP_ERR_NOT_OPEN	Instance control block is not open.

◆ R_SDADC_Calibrate()

fsp_err_t R_SDADC_Calibrate	(	adc_ctrl_t *const	p_ctrl,
		void const *	p_extend
	)

Requires sdadc_calibrate_args_t passed to p_extend. Calibrates the specified channel. Calibration is not required or supported for single-ended mode. Calibration must be completed for differential mode before using the SDADC. A callback with the event ADC_EVENT_CALIBRATION_COMPLETE is called when calibration completes. Implements adc_api_t::calibrate().

During external offset calibration, apply a differential voltage of 0 to ANSDnP - ANSDnN, where n is the input channel and ANSDnP is OPAMP0 for channel 4 and ANSDnN is OPAMP1 for channel 4. Complete external offset calibration before external gain calibration.

During external gain calibration apply a voltage between 0.4 V / total_gain and 0.8 V / total_gain. The differential voltage applied during calibration is corrected to a conversion result of 0x7FFFFF, which is the maximum possible positive differential measurement.

This function clears the offset value. If offset is required after calibration, it must be reapplied after calibration is complete using adc_api_t::offsetSet.

Return values

FSP_SUCCESS	Calibration began successfully.
FSP_ERR_ASSERTION	An input pointer was NULL.
FSP_ERR_IN_USE	A conversion or calibration is in progress.
FSP_ERR_NOT_OPEN	Instance control block is not open.

◆ R_SDADC_Close()

fsp_err_t R_SDADC_Close ( adc_ctrl_t * p_ctrl )

Stops any scan in progress, disables interrupts, and powers down the SDADC peripheral. Implements adc_api_t::close().

Note: This function delays at least 3 us as required by the SDADC24 stop procedure.

Return values

FSP_SUCCESS	Instance control block closed successfully.
FSP_ERR_ASSERTION	An input pointer was NULL.
FSP_ERR_NOT_OPEN	Instance control block is not open.

Functions

Detailed Description

Overview

Features

Selecting an ADC

Configuration

Build Time Configurations for r_sdadc

Configurations for Analog > ADC (r_sdadc)

Configurations for Analog > SDADC Channel Configuration (r_sdadc)

Clock Configuration

Pin Configuration

Usage Notes

Scan Procedure

When Interrupts Are Not Enabled

Calibration

Examples

Basic Example

Using DTC or DMAC with the SDADC

Data Structures

Enumerations

Data Structure Documentation

◆ sdadc_calibrate_args_t

◆ sdadc_channel_cfg_t

◆ sdadc_scan_cfg_t

◆ sdadc_extended_cfg_t

◆ sdadc_instance_ctrl_t

Enumeration Type Documentation

◆ sdadc_vref_src_t

◆ sdadc_vref_voltage_t

◆ sdadc_channel_input_t

◆ sdadc_channel_stage_1_gain_t

◆ sdadc_channel_stage_2_gain_t

◆ sdadc_channel_oversampling_t

◆ sdadc_channel_polarity_t

◆ sdadc_channel_average_t

◆ sdadc_channel_inversion_t

◆ sdadc_channel_count_formula_t

◆ sdadc_calibration_t

Function Documentation

◆ R_SDADC_Open()

◆ R_SDADC_ScanCfg()

◆ R_SDADC_InfoGet()

◆ R_SDADC_ScanStart()

◆ R_SDADC_ScanGroupStart()

◆ R_SDADC_ScanStop()

◆ R_SDADC_StatusGet()

◆ R_SDADC_Read()

◆ R_SDADC_Read32()

◆ R_SDADC_OffsetSet()

◆ R_SDADC_Calibrate()

◆ R_SDADC_Close()