/* USER CODE BEGIN Header */
/**
@page ADC_SingleConversion_TriggerTimer_DMA ADC example
@verbatim
******************************************************************************
* @file Examples/ADC/ADC_SingleConversion_TriggerTimer_DMA/readme.txt
* @author MCD Application Team
* @brief Description of the ADC_SingleConversion_TriggerTimer_DMA example.
******************************************************************************
*
* Copyright (c) 2020 STMicroelectronics. All rights reserved.
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
@endverbatim
@par Example Description
Use ADC to convert a single channel at each trig from timer,
conversion data are transferred by DMA into an array, indefinitely (circular mode).
Example configuration:
ADC is configured to convert a single channel, in single conversion mode,
from HW trigger: timer peripheral.
DMA is configured to transfer conversion data in an array, in circular mode.
A timer is configured in time base and to generate TRGO events.
Example execution:
From the start, the ADC converts the selected channel at each trig from timer.
DMA transfers conversion data to the array, DMA transfer complete interruption occurs.
Results array is updated indefinitely (DMA in circular mode).
LED2 is turned on when the DMA transfer is completed (results array full)
and turned off at next DMA half-transfer (result array first half updated).
For debug: variables to monitor with debugger watch window:
- "aADCxConvertedData": ADC group regular conversion data (array of data)
- "aADCxConvertedData_Voltage_mVolt": ADC conversion data computation to physical values (array of data)
Connection needed:
None, if ADC channel and DAC channel are selected on the same GPIO.
Otherwise, connect a wire between DAC channel output and ADC input.
Other peripherals used:
1 GPIO for LED
1 GPIO for analog input: PA10 (Arduino connector CN8 pin 3, Morpho connector CN7 pin 32)
DAC
1 GPIO for DAC channel output PA10 (Arduino connector CN8 pin 3, Morpho connector CN7 pin 32)
1 GPIO for push button
DMA
Timer
Board settings:
- ADC is configured to convert ADC_CHANNEL_6 (Arduino connector CN8 pin 3, Morpho connector CN7 pin 32).
- The voltage input on ADC channel is provided from DAC (DAC_CHANNEL_1).
ADC input from pin PA10 and DAC output to pin PA10:
If same pin is used no connection is required, it is done internally. Otherwise, user need to connect a wire between Arduino connector CN8 pin 3, Morpho connector CN7 pin 32 and Arduino connector CN8 pin 3, Morpho connector CN7 pin 32
- Voltage is increasing at each click on User push-button (B1), from 0 to maximum range in 4 steps.
Clicks on User push-button (B1) follow circular cycles: At clicks counter maximum value reached, counter is set back to 0.
To observe voltage level applied on ADC channel through GPIO, connect a voltmeter on
pin PA10 (Arduino connector CN8 pin 3, Morpho connector CN7 pin 32).
NUCLEO-WL55JC RevC board LED is be used to monitor the program execution status:
- Normal operation: LED2 is turned-on/off in function of ADC conversion
result.
- Toggling: "On" upon conversion completion (full DMA buffer filled)
"Off" upon half conversion completion (half DMA buffer filled)
- Error: In case of error, LED2 is toggling twice at a frequency of 1Hz.
@par Keywords
ADC, analog digital converter, analog, conversion, voltage, channel, analog input, DMA transfer, trigger
@par Directory contents
- ADC/ADC_SingleConversion_TriggerTimer_DMA/Inc/stm32wlxx_nucleo_conf.h BSP configuration file
- ADC/ADC_SingleConversion_TriggerTimer_DMA/Inc/stm32wlxx_hal_conf.h HAL configuration file
- ADC/ADC_SingleConversion_TriggerTimer_DMA/Inc/stm32wlxx_it.h Interrupt handlers header file
- ADC/ADC_SingleConversion_TriggerTimer_DMA/Inc/main.h Header for main.c module
- ADC/ADC_SingleConversion_TriggerTimer_DMA/Src/stm32wlxx_it.c Interrupt handlers
- ADC/ADC_SingleConversion_TriggerTimer_DMA/Src/main.c Main program
- ADC/ADC_SingleConversion_TriggerTimer_DMA/Src/stm32wlxx_hal_msp.c HAL MSP module
- ADC/ADC_SingleConversion_TriggerTimer_DMA/Src/system_stm32wlxx.c STM32WLxx system source file
@par Hardware and Software environment
- This example runs on STM32WLxx devices.
- This example has been tested with NUCLEO-WL55JC RevC 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
* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
*/
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