Functions
fsp_err_t	R_OPAMP_Open (opamp_ctrl_t const p_api_ctrl, opamp_cfg_t const const p_cfg)

fsp_err_t	R_OPAMP_InfoGet (opamp_ctrl_t const p_api_ctrl, opamp_info_t const p_info)

fsp_err_t	R_OPAMP_Start (opamp_ctrl_t *const p_api_ctrl, uint32_t const channel_mask)

fsp_err_t	R_OPAMP_Stop (opamp_ctrl_t *const p_api_ctrl, uint32_t const channel_mask)

fsp_err_t	R_OPAMP_StatusGet (opamp_ctrl_t const p_api_ctrl, opamp_status_t const p_status)

fsp_err_t	R_OPAMP_Trim (opamp_ctrl_t const p_api_ctrl, opamp_trim_cmd_t const cmd, opamp_trim_args_t const const p_args)

fsp_err_t	R_OPAMP_Close (opamp_ctrl_t *const p_api_ctrl)

Detailed Description

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

Overview

The OPAMP HAL module provides a high level API for signal amplification applications and supports the OPAMP peripheral available on RA MCUs.

Features

Low power or high-speed mode
Start by software or AGT compare match
Stop by software or ADC conversion end (stop by ADC conversion end only supported on op-amp channels configured to start by AGT compare match)
Trimming available on some MCUs (see hardware manual)

Supported Devices

Device Group	Devices
RA2	RA2A1
RA4	RA4M1, RA4W1

Configuration

Build Time Configurations for r_opamp

The following build time configurations are defined in fsp_cfg/r_opamp_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 > Operational Amplifier (r_opamp)

This module can be added to the Stacks tab via New Stack > Analog > Operational Amplifier (r_opamp).

Configuration	Options	Default	Description
Name	Name must be a valid C symbol	g_opamp0	Module name.
AGT Start Trigger Configuration (N/A unless AGT Start Trigger is Selected for the Channel)	AGT1 Compare Match Starts OPAMPs 0 and 2 if configured for AGT Start, AGT0 Compare Match Starts OPAMPs 1 and 3 if configured for AGT Start AGT1 Compare Match Starts OPAMPs 0 and 1 if configured for AGT Start, AGT0 Compare Match Starts OPAMPs 2 and 3 if configured for AGT Start AGT1 Compare Match Starts all OPAMPs configured for AGT Start	AGT1 Compare Match Starts all OPAMPs configured for AGT Start	Configure which AGT channel event triggers which op-amp channel. The AGT compare match event only starts the op-amp channel if the AGT Start trigger is selected in the Trigger configuration for the channel.
Power Mode	MCU Specific Options		Configure the op-amp based on power or speed requirements. This setting affects the minimum required stabilization time. Middle speed is not available for all MCUs.
Trigger Channel 0	MCU Specific Options		Select the event triggers to start or stop op-amp channel 0. If the event trigger is selected for start, the start() API enables the event trigger for this channel. If the event trigger is selected for stop, the stop() API disables the event trigger for this channel.
Trigger Channel 1	MCU Specific Options		Select the event triggers to start or stop op-amp channel 1. If the event trigger is selected for start, the start() API enables the event trigger for this channel. If the event trigger is selected for stop, the stop() API disables the event trigger for this channel.
Trigger Channel 2	Software Start Software Stop AGT Start Software Stop AGT Start ADC Stop	Software Start Software Stop	Select the event triggers to start or stop op-amp channel 2. If the event trigger is selected for start, the start() API enables the event trigger for this channel. If the event trigger is selected for stop, the stop() API disables the event trigger for this channel.
Trigger Channel 3	MCU Specific Options		Select the event triggers to start or stop op-amp channel 3. If the event trigger is selected for start, the start() API enables the event trigger for this channel. If the event trigger is selected for stop, the stop() API disables the event trigger for this channel.
OPAMP AMP0OS	MCU Specific Options		Select output to connect to AMP0O pin
OPAMP AMP0PS	MCU Specific Options		Select input to connect to AMP0+ pin
OPAMP AMP0MS	MCU Specific Options		Select input to connect to AMP0- pin
OPAMP AMP1PS	MCU Specific Options		Select input to connect to AMP1+ pin
OPAMP AMP1MS	MCU Specific Options		Select input to connect to AMP1- pin
OPAMP AMP2PS	MCU Specific Options		Select input to connect to AMP2+ pin
OPAMP AMP2MS	MCU Specific Options		Select input to connect to AMP2- pin

Clock Configuration

The OPAMP runs on PCLKB.

Pin Configuration

To use the OPAMP HAL module, the port pins for the channels receiving the analog input must be set as inputs on the Pins tab of the RA Configuration editor.

Refer to the most recent FSP Release Notes for any additional operational limitations for this module.

Usage Notes

Trimming the OPAMP

On MCUs that support trimming, the op-amp trim register is set to the factory default after the Open API is called.
This function allows the application to trim the operational amplifier to a user setting, which overwrites the factory default trim values.
Supported on selected MCUs. See hardware manual for details.
Not supported if configured for low power mode (OPAMP_MODE_LOW_POWER).
This function is not reentrant. Only one side of one op-amp can be trimmed at a time. Complete the procedure for one side of one channel before calling the trim API with the command OPAMP_TRIM_CMD_START again.
- The trim procedure works as follows:
- Call trim() for the Pch (+) side input with command OPAMP_TRIM_CMD_START.
- Connect a fixed voltage to the Pch (+) input.
- Connect the Nch (-) input to the op-amp output to create a voltage follower.
- Ensure the op-amp is operating and stabilized.
- Call trim() for the Pch (+) side input with command OPAMP_TRIM_CMD_START.
- Measure the fixed voltage connected to the Pch (+) input using the SAR ADC and save the value (referred to as A later in this procedure).
- Iterate over the following loop 5 times:
  - Call trim() for the Pch (+) side input with command OPAMP_TRIM_CMD_NEXT_STEP.
  - Measure the op-amp output using the SAR ADC (referred to as B in the next step).
  - If A <= B, call trim() for the Pch (+) side input with command OPAMP_TRIM_CMD_CLEAR_BIT.
- Call trim() for the Nch (-) side input with command OPAMP_TRIM_CMD_START.
- Measure the fixed voltage connected to the Pch (+) input using the SAR ADC and save the value (referred to as A later in this procedure).
- Iterate over the following loop 5 times:
  - Call trim() for the Nch (-) side input with command OPAMP_TRIM_CMD_NEXT_STEP.
  - Measure the op-amp output using the SAR ADC (referred to as B in the next step).
  - If A <= B, call trim() for the Nch (-) side input with command OPAMP_TRIM_CMD_CLEAR_BIT.

Examples

Basic Example

This is a basic example of minimal use of the R_OPAMP in an application. The example demonstrates configuring OPAMP channel 0 for high speed mode, starting the OPAMP and reading the status of the OPAMP channel running. It also verifies that the stabilization wait time is the expected time for selected power mode

#define OPAMP_EXAMPLE_CHANNEL    (0U)
void basic_example (void)
{
    fsp_err_t err;
    /* Initialize the OPAMP module. */
    err = R_OPAMP_Open(&g_opamp_ctrl, &g_opamp_cfg);
    /* Handle any errors. This function should be defined by the user. */
    assert(FSP_SUCCESS == err);
    /* Start the OPAMP module. */
    err = R_OPAMP_Start(&g_opamp_ctrl, 1 << OPAMP_EXAMPLE_CHANNEL);
    assert(FSP_SUCCESS == err);
    /* Look up the required stabilization wait time. */
    opamp_info_t info;
    err = R_OPAMP_InfoGet(&g_opamp_ctrl, &info);
    assert(FSP_SUCCESS == err);
    /* Wait for the OPAMP to stabilize. */
    R_BSP_SoftwareDelay(info.min_stabilization_wait_us, BSP_DELAY_UNITS_MICROSECONDS);
}

Trim Example

This example demonstrates the typical trimming procedure for opamp channel 0 using R_OPAMP_Trim() API.

#ifndef OPAMP_EXAMPLE_CHANNEL
 #define OPAMP_EXAMPLE_CHANNEL        (0U)
#endif
#ifndef OPAMP_EXAMPLE_ADC_CHANNEL
 #define OPAMP_EXAMPLE_ADC_CHANNEL    (ADC_CHANNEL_2)
#endif
#define ADC_SCAN_END_DELAY            (100U)
#define OPAMP_TRIM_LOOP_COUNT         (5)
#define ADC_SCAN_END_MAX_TIMEOUT      (0xFFFF)
uint32_t          g_callback_event_counter = 0;
opamp_trim_args_t trim_args_ch             =
{
    .channel = OPAMP_EXAMPLE_CHANNEL,
    .input   = OPAMP_TRIM_INPUT_PCH
};
/* This callback is called when ADC Scan Complete event is generated. */
void adc_callback (adc_callback_args_t * p_args)
{
    FSP_PARAMETER_NOT_USED(p_args);
    g_callback_event_counter++;
}
void trimming_example (void)
{
    fsp_err_t err;
    /* On RA2A1, configure negative feedback and put DAC12 signal on AMP0+ Pin. */
    g_opamp_cfg_extend.plus_input_select_opamp0  = OPAMP_PLUS_INPUT_AMPPS7;
    g_opamp_cfg_extend.minus_input_select_opamp0 = OPAMP_MINUS_INPUT_AMPMS7;
    /* Initialize the OPAMP module. */
    err = R_OPAMP_Open(&g_opamp_ctrl, &g_opamp_cfg);
    /* Handle any errors. This function should be defined by the user. */
    assert(FSP_SUCCESS == err);
    /* Start the OPAMP module. */
    err = R_OPAMP_Start(&g_opamp_ctrl, 1 << OPAMP_EXAMPLE_CHANNEL);
    assert(FSP_SUCCESS == err);
    /* Look up the required stabilization wait time. */
    opamp_info_t info;
    err = R_OPAMP_InfoGet(&g_opamp_ctrl, &info);
    assert(FSP_SUCCESS == err);
    /* Wait for the OPAMP to stabilize. */
    R_BSP_SoftwareDelay(info.min_stabilization_wait_us, BSP_DELAY_UNITS_MICROSECONDS);
    /* Call trim() for the Pch (+) side input */
    trim_procedure(&trim_args_ch);
    assert(FSP_SUCCESS == err);
    trim_args_ch.input = OPAMP_TRIM_INPUT_NCH;
    /* Call trim() for the Nch (-) side input */
    trim_procedure(&trim_args_ch);
}
void trim_procedure (opamp_trim_args_t * trim_args)
{
    fsp_err_t err;
    /* Call trim() for the selected channel and input with command OPAMP_TRIM_CMD_START. */
    err = R_OPAMP_Trim(&g_opamp_ctrl, OPAMP_TRIM_CMD_START, trim_args);
    assert(FSP_SUCCESS == err);
    /* Measure the fixed voltage connected to the channel input using the SAR ADC and save the value
     * (referred to as result_a later in this procedure). */
    /* Reset the ADC callback counter */
    g_callback_event_counter = 0;
    err = R_ADC_ScanStart(&g_adc_ctrl);
    assert(FSP_SUCCESS == err);
    /* Wait for ADC scan complete flag */
    uint32_t timeout = ADC_SCAN_END_MAX_TIMEOUT;
    while (g_callback_event_counter == 0 && timeout != 0)
    {
        timeout--;
    }
    if (0 == timeout)
    {
        err = FSP_ERR_TIMEOUT;
        assert(FSP_SUCCESS == err);
    }
    uint16_t result_a;
    err = R_ADC_Read(&g_adc_ctrl, OPAMP_EXAMPLE_ADC_CHANNEL, &result_a);
    assert(FSP_SUCCESS == err);
    /* Iterate over the following loop 5 times: */
    /* Call trim() with command OPAMP_TRIM_CMD_NEXT_STEP for the selected channel and given input. */
    uint8_t count = OPAMP_TRIM_LOOP_COUNT;
    while (count > 0)
    {
        count--;
        err = R_OPAMP_Trim(&g_opamp_ctrl, OPAMP_TRIM_CMD_NEXT_STEP, trim_args);
        assert(FSP_SUCCESS == err);
        /* Reset the ADC callback counter */
        g_callback_event_counter = 0;
        /* Read converted value after trim completes. */
        err = R_ADC_ScanStart(&g_adc_ctrl);
        assert(FSP_SUCCESS == err);
        /* Wait for ADC scan complete flag */
        timeout = ADC_SCAN_END_MAX_TIMEOUT;
        while (g_callback_event_counter == 0 && timeout != 0)
        {
            timeout--;
        }
        if (0 == timeout)
        {
            err = FSP_ERR_TIMEOUT;
            assert(FSP_SUCCESS == err);
        }
        uint16_t result_b;
        err = R_ADC_Read(&g_adc_ctrl, OPAMP_EXAMPLE_ADC_CHANNEL, &result_b);
        assert(FSP_SUCCESS == err);
        /* Measure the op-amp output using the SAR ADC (referred to as result_b in the next step). */
        /* If result_a <= result_b, call trim() for the selected channel and input with command OPAMP_TRIM_CMD_CLEAR_BIT. */
        if (result_a <= result_b)
        {
            err = R_OPAMP_Trim(&g_opamp_ctrl, OPAMP_TRIM_CMD_CLEAR_BIT, trim_args);
            assert(FSP_SUCCESS == err);
        }
    }
}

Data Structures
struct	opamp_extended_cfg_t

struct	opamp_instance_ctrl_t

Macros
#define	OPAMP_MASK_CHANNEL_0

Enumerations
enum	opamp_trigger_t

enum	opamp_agt_link_t

enum	opamp_mode_t

enum	opamp_plus_input_t

enum	opamp_minus_input_t

enum	opamp_output_t

Variables
const opamp_api_t	g_opamp_on_opamp

Data Structure Documentation

◆ opamp_extended_cfg_t

struct opamp_extended_cfg_t

OPAMP configuration extension. This extension is required and must be provided in opamp_cfg_t::p_extend.

Data Fields
opamp_agt_link_t	agt_link	Configure which AGT links are paired to which channel. Only applies to channels if OPAMP_TRIGGER_AGT_START_SOFTWARE_STOP or OPAMP_TRIGGER_AGT_START_ADC_STOP is selected for the channel.
opamp_mode_t	mode	Low power, middle speed, or high speed mode.
opamp_trigger_t	trigger_channel_0	Start and stop triggers for channel 0.
opamp_trigger_t	trigger_channel_1	Start and stop triggers for channel 1.
opamp_trigger_t	trigger_channel_2	Start and stop triggers for channel 2.
opamp_trigger_t	trigger_channel_3	Start and stop triggers for channel 3.
opamp_plus_input_t	plus_input_select_opamp0	OPAMP0+ connection.
opamp_minus_input_t	minus_input_select_opamp0	OPAMP0- connection.
opamp_output_t	output_select_opamp0	OPAMP0O connection.
opamp_plus_input_t	plus_input_select_opamp1	OPAMP1+ connection.
opamp_minus_input_t	minus_input_select_opamp1	OPAMP1- connection.
opamp_plus_input_t	plus_input_select_opamp2	OPAMP2+ connection.
opamp_minus_input_t	minus_input_select_opamp2	OPAMP2- connection.

◆ opamp_instance_ctrl_t

struct opamp_instance_ctrl_t

OPAMP instance control block. DO NOT INITIALIZE. Initialized in opamp_api_t::open().

Macro Definition Documentation

◆ OPAMP_MASK_CHANNEL_0

#define OPAMP_MASK_CHANNEL_0

Version of code that implements the API defined in this file

Enumeration Type Documentation

◆ opamp_trigger_t

enum opamp_trigger_t

Start and stop trigger for the op-amp.

Enumerator
OPAMP_TRIGGER_SOFTWARE_START_SOFTWARE_STOP	Start and stop with APIs.
OPAMP_TRIGGER_AGT_START_SOFTWARE_STOP	Start by AGT compare match and stop with API.
OPAMP_TRIGGER_AGT_START_ADC_STOP	Start by AGT compare match and stop after ADC conversion.

◆ opamp_agt_link_t

enum opamp_agt_link_t

Which AGT timer starts the op-amp. Only applies to channels if OPAMP_TRIGGER_AGT_START_SOFTWARE_STOP or OPAMP_TRIGGER_AGT_START_ADC_STOP is selected for the channel. If OPAMP_TRIGGER_SOFTWARE_START_SOFTWARE_STOP is selected for a channel, then no AGT compare match event will start that op-amp channel.

Enumerator
OPAMP_AGT_LINK_AGT1_OPAMP_0_2_AGT0_OPAMP_1_3	OPAMP channel 0 and 2 are started by AGT1 compare match. OPAMP channel 1 and 3 are started by AGT0 compare match.
OPAMP_AGT_LINK_AGT1_OPAMP_0_1_AGT0_OPAMP_2_3	OPAMP channel 0 and 1 are started by AGT1 compare match. OPAMP channel 2 and 3 are started by AGT0 compare match.
OPAMP_AGT_LINK_AGT1_OPAMP_0_1_2_3	All OPAMP channels are started by AGT1 compare match.

◆ opamp_mode_t

enum opamp_mode_t

Op-amp mode.

Enumerator
OPAMP_MODE_LOW_POWER	Low power mode.
OPAMP_MODE_MIDDLE_SPEED	Middle speed mode (not supported on all MCUs)
OPAMP_MODE_HIGH_SPEED	High speed mode.

◆ opamp_plus_input_t

enum opamp_plus_input_t

Options to connect AMPnPS pins.

Enumerator
OPAMP_PLUS_INPUT_NONE	No Connection.
OPAMP_PLUS_INPUT_AMPPS0	Set AMPPS0. See hardware manual for channel specific options.
OPAMP_PLUS_INPUT_AMPPS1	Set AMPPS1. See hardware manual for channel specific options.
OPAMP_PLUS_INPUT_AMPPS2	Set AMPPS2. See hardware manual for channel specific options.
OPAMP_PLUS_INPUT_AMPPS3	Set AMPPS3. See hardware manual for channel specific options.
OPAMP_PLUS_INPUT_AMPPS7	Set AMPPS7. See hardware manual for channel specific options.

◆ opamp_minus_input_t

enum opamp_minus_input_t

Options to connect AMPnMS pins.

Enumerator
OPAMP_MINUS_INPUT_NONE	No Connection.
OPAMP_MINUS_INPUT_AMPMS0	Set AMPMS0. See hardware manual for channel specific options.
OPAMP_MINUS_INPUT_AMPMS1	Set AMPMS1. See hardware manual for channel specific options.
OPAMP_MINUS_INPUT_AMPMS2	Set AMPMS2. See hardware manual for channel specific options.
OPAMP_MINUS_INPUT_AMPMS3	Set AMPMS3. See hardware manual for channel specific options.
OPAMP_MINUS_INPUT_AMPMS4	Set AMPMS4. See hardware manual for channel specific options.
OPAMP_MINUS_INPUT_AMPMS7	Set AMPMS7. See hardware manual for channel specific options.

◆ opamp_output_t

enum opamp_output_t

Options to connect AMP0OS pin.

Enumerator
OPAMP_OUTPUT_NONE	No Connection.
OPAMP_OUTPUT_AMPOS0	Set AMPOS0. See hardware manual for channel specific options.
OPAMP_OUTPUT_AMPOS1	Set AMPOS1. See hardware manual for channel specific options.
OPAMP_OUTPUT_AMPOS2	Set AMPOS2. See hardware manual for channel specific options.
OPAMP_OUTPUT_AMPOS3	Set AMPOS3. See hardware manual for channel specific options.

Function Documentation

◆ R_OPAMP_Open()

fsp_err_t R_OPAMP_Open	(	opamp_ctrl_t *const	p_api_ctrl,
		opamp_cfg_t const *const	p_cfg
	)

Applies power to the OPAMP and initializes the hardware based on the user configuration. Implements opamp_api_t::open.

The op-amp is not operational until the opamp_api_t::start is called. If the op-amp is configured to start after AGT compare match, the op-amp is not operational until opamp_api_t::start and the associated AGT compare match event occurs.

Some MCUs have switches that must be set before starting the op-amp. These switches must be set in the application code after opamp_api_t::open and before opamp_api_t::start.

Example:

    /* Initialize the OPAMP module. */
    err = R_OPAMP_Open(&g_opamp_ctrl, &g_opamp_cfg);

Return values

FSP_SUCCESS	Configuration successful.
FSP_ERR_ASSERTION	An input pointer is NULL.
FSP_ERR_ALREADY_OPEN	Control block is already opened.
FSP_ERR_INVALID_ARGUMENT	An attempt to configure OPAMP in middle speed mode on MCU that does not support middle speed mode.

◆ R_OPAMP_InfoGet()

fsp_err_t R_OPAMP_InfoGet	(	opamp_ctrl_t *const	p_api_ctrl,
		opamp_info_t *const	p_info
	)

Provides the minimum stabilization wait time in microseconds. Implements opamp_api_t::infoGet.

Example:
/* Look up the required stabilization wait time. */
opamp_info_t info;
err = R_OPAMP_InfoGet(&g_opamp_ctrl, &info);
assert(FSP_SUCCESS == err);
/* Wait for the OPAMP to stabilize. */
R_BSP_SoftwareDelay(info.min_stabilization_wait_us, BSP_DELAY_UNITS_MICROSECONDS);

Return values

FSP_SUCCESS information on opamp_power_mode stored in p_info.

FSP_ERR_ASSERTION An input pointer was NULL.

FSP_ERR_NOT_OPEN Instance control block is not open.

◆ R_OPAMP_Start()

fsp_err_t R_OPAMP_Start	(	opamp_ctrl_t *const	p_api_ctrl,
		uint32_t const	channel_mask
	)

If the OPAMP is configured for hardware triggers, enables hardware triggers. Otherwise, starts the op-amp. Implements opamp_api_t::start.

Some MCUs have switches that must be set before starting the op-amp. These switches must be set in the application code after opamp_api_t::open and before opamp_api_t::start.

Example:

    /* Start the OPAMP module. */
    err = R_OPAMP_Start(&g_opamp_ctrl, 1 << OPAMP_EXAMPLE_CHANNEL);
    assert(FSP_SUCCESS == err);

Return values

FSP_SUCCESS	Op-amp 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_INVALID_ARGUMENT	channel_mask includes a channel that does not exist on this MCU.

◆ R_OPAMP_Stop()

fsp_err_t R_OPAMP_Stop	(	opamp_ctrl_t *const	p_api_ctrl,
		uint32_t const	channel_mask
	)

Stops the op-amp. If the OPAMP is configured for hardware triggers, disables hardware triggers. Implements opamp_api_t::stop.

Return values

FSP_SUCCESS	Op-amp stopped or hardware triggers disabled successfully.
FSP_ERR_ASSERTION	An input pointer was NULL.
FSP_ERR_NOT_OPEN	Instance control block is not open.
FSP_ERR_INVALID_ARGUMENT	channel_mask includes a channel that does not exist on this MCU.

◆ R_OPAMP_StatusGet()

fsp_err_t R_OPAMP_StatusGet	(	opamp_ctrl_t *const	p_api_ctrl,
		opamp_status_t *const	p_status
	)

Provides the operating status for each op-amp in a bitmask. This bit is set when operation begins, before the stabilization wait time has elapsed. Implements opamp_api_t::statusGet.

Return values

FSP_SUCCESS	Operating status of each op-amp provided in p_status.
FSP_ERR_ASSERTION	An input pointer was NULL.
FSP_ERR_NOT_OPEN	Instance control block is not open.

◆ R_OPAMP_Trim()

fsp_err_t R_OPAMP_Trim	(	opamp_ctrl_t *const	p_api_ctrl,
		opamp_trim_cmd_t const	cmd,
		opamp_trim_args_t const *const	p_args
	)

On MCUs that support trimming, the op-amp trim register is set to the factory default after open(). This function allows the application to trim the operational amplifier to a user setting, which overwrites the factory default factory trim values.

Not supported on all MCUs. See hardware manual for details. Not supported if configured for low power mode (OPAMP_MODE_LOW_POWER).

This function is not reentrant. Only one side of one op-amp can be trimmed at a time. Complete the procedure for one side of one channel before calling trim() with command OPAMP_TRIM_CMD_START again.

Implements opamp_api_t::trim.

See "User Offset Trimming" in the OPAMP section of the relevant hardware manual. The trim procedure works as follows:

Call trim() for the Pch (+) side input with command OPAMP_TRIM_CMD_START.
Connect a fixed voltage to the Pch (+) input.
Connect the Nch (-) input to the op-amp output to create a voltage follower.
Ensure the op-amp is operating and stabilized.
Call trim() for the Pch (+) side input with command OPAMP_TRIM_CMD_START.
Measure the fixed voltage connected to the Pch (+) input using the SAR ADC and save the value (referred to as A later in this procedure).
Iterate over the following loop 5 times:
- Call trim() for the Pch (+) side input with command OPAMP_TRIM_CMD_NEXT_STEP.
- Measure the op-amp output using the SAR ADC (referred to as B in the next step).
- If A <= B, call trim() for the Pch (+) side input with command OPAMP_TRIM_CMD_CLEAR_BIT.
Call trim() for the Nch (-) side input with command OPAMP_TRIM_CMD_START.
Measure the fixed voltage connected to the Pch (+) input using the SAR ADC and save the value (referred to as A later in this procedure).
Iterate over the following loop 5 times:
- Call trim() for the Nch (-) side input with command OPAMP_TRIM_CMD_NEXT_STEP.
- Measure the op-amp output using the SAR ADC (referred to as B in the next step).
- If A <= B, call trim() for the Nch (-) side input with command OPAMP_TRIM_CMD_CLEAR_BIT.

Return values

FSP_SUCCESS	Conversion result in p_data.
FSP_ERR_UNSUPPORTED	Trimming is not supported on this MCU.
FSP_ERR_INVALID_STATE	The command is not valid in the current state of the trim state machine.
FSP_ERR_INVALID_ARGUMENT	The requested channel is not operating or the trim procedure is not in progress for this channel/input combination.
FSP_ERR_INVALID_MODE	Trim is not allowed in low power mode.
FSP_ERR_ASSERTION	An input pointer was NULL.
FSP_ERR_NOT_OPEN	Instance control block is not open.

◆ R_OPAMP_Close()

fsp_err_t R_OPAMP_Close ( opamp_ctrl_t *const p_api_ctrl )

Stops the op-amps. Implements opamp_api_t::close.

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.

Variable Documentation

◆ g_opamp_on_opamp

const opamp_api_t g_opamp_on_opamp

OPAMP Implementation of OPAMP interface.

FSP_SUCCESS	information on opamp_power_mode stored in p_info.
FSP_ERR_ASSERTION	An input pointer was NULL.
FSP_ERR_NOT_OPEN	Instance control block is not open.

Functions

Detailed Description

Overview

Features

Supported Devices

Configuration

Build Time Configurations for r_opamp

Configurations for Analog > Operational Amplifier (r_opamp)

Clock Configuration

Pin Configuration

Usage Notes

Trimming the OPAMP

Examples

Basic Example

Trim Example

Data Structures

Macros

Enumerations

Variables

Data Structure Documentation

◆ opamp_extended_cfg_t

◆ opamp_instance_ctrl_t

Macro Definition Documentation

◆ OPAMP_MASK_CHANNEL_0

Enumeration Type Documentation

◆ opamp_trigger_t

◆ opamp_agt_link_t

◆ opamp_mode_t

◆ opamp_plus_input_t

◆ opamp_minus_input_t

◆ opamp_output_t

Function Documentation

◆ R_OPAMP_Open()

◆ R_OPAMP_InfoGet()

◆ R_OPAMP_Start()

◆ R_OPAMP_Stop()

◆ R_OPAMP_StatusGet()

◆ R_OPAMP_Trim()

◆ R_OPAMP_Close()

Variable Documentation

◆ g_opamp_on_opamp