/**
@page OPAMP_CALIBRATION OPAMP example
@verbatim
******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
* @file Examples_MIX/OPAMP/OPAMP_CALIBRATION/readme.txt
* @author MCD Application Team
* @brief Description of the OPAMP_CALIBRATION example.
******************************************************************************
* @attention
*
* Copyright (c) 2016 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
@endverbatim
@par Example Description
How to calibrate and operate the OPAMP peripheral. This example is based on the
STM32F3xx OPAMP HAL and LL API (the latter to maximize performance).
Example configuration:
Operational amplifier instance OPAMP2 is configured in follower mode.
OPAMP non-inverting input and output are set to be connected to GPIO pins.
OPAMP inverting input is not connected externally (internal connection in follower mode).
Other peripherals configured in this example:
One DAC channel, one DMA channel and one timer are configured to generate a voltage
waveform to test the OPAMP: sinus waveform.
Example execution:
OPAMP calibration done using HAL driver, because requires to follow a particular
procedure. HAL OPAMP driver provides this service.
Then, switch from HAL driver to LL driver (caution: any further switch back to
HAL driver is not possible).
Following OPAMP operations are done using LL driver because actions are
more light and quick: OPAMP enable, OPAMP settings update.
This example shows how to:
- Get factory calibration (trimming) settings.
- Enable/disable OPAMP
- Calibrate OPAMP peripheral before use of OPAMP.
Hence changes can be monitored (versus factory settings or in case of
temperature impact for instance).
Push the Key Push button (connected to PC.13 pin) to switch from one step to the
next one.
Key push button steps are:
-> 1st Push:
+ Factory trimming retrieved
+ User trimming set according to self calibration (1st run)
+ Factory trimming and user trimming are compared
- If The LED blinks rapidly: Calibrated trimming are different from Factory Trimming
- ................. slowly : Calibrated trimming same as Factory Trimming
-> 2nd Push:
+ OPAMP start
+ Use of previously calibrated user Trimming values
-> 3rd Push:
+ change OPAMP setting on the fly (dummy change, without application purpose in this example: change non-inverting input source)
-> 4th Push:
+ OPAMP stopped
-> 5th Push: end of test
Connection needed:
To check OPAMP amplification, you can either:
- Use the waveform generated in this example by DAC channel:
connect DAC channel output PA.04 to OPAMP non-inverting input PA.07.
- Connect a voltage to OPAMP non-inverting input PA.07
between ground (0V) and Vdda (3.3V).
Voltage amplified by the OPAMP can be observed on OPAMP output (see pins below, with list of GPIO used).
Other peripheral used:
1 GPIO for push button
1 GPIO for DAC channel output PA.04 (Arduino connector CN8 pin A2, Morpho connector CN7 pin 32)
1 GPIO for OPAMP non-inverting input: PA.07 (Arduino connector CN5 pin D11, Morpho connector CN10 pin 15)
1 GPIO for OPAMP output: PA.06 (Arduino connector CN5 pin D12, Morpho connector CN10 pin 13)
For waveform generation: 1 DAC channel, 1 DMA channel, 1 timer.
@par Directory contents
- OPAMP/OPAMP_CALIBRATION/Inc/stm32f3xx_hal_conf.h HAL configuration file
- OPAMP/OPAMP_CALIBRATION/Inc/stm32f3xx_it.h DMA interrupt handlers header file
- OPAMP/OPAMP_CALIBRATION/Inc/main.h Header for main.c module
- OPAMP/OPAMP_CALIBRATION/Src/stm32f3xx_it.c DMA interrupt handlers
- OPAMP/OPAMP_CALIBRATION/Src/main.c Main program
- OPAMP/OPAMP_CALIBRATION/Src/stm32f3xx_hal_msp.c HAL MSP file
- OPAMP/OPAMP_CALIBRATION/Src/system_stm32f3xx.c STM32F3xx system source file
@par Hardware and Software environment
- This example runs on STM32F334R8 devices.
- This example has been tested with STM32F334R8-Nucleo Rev C board and can be
easily tailored to any other supported device and development board.
@par How to use it ?
In order to make the program work, you must do the following :
- Open your preferred toolchain
- Rebuild all files and load your image into target memory
- Run the example
*/
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