/**
@page ADC_RegularConversion_DMA conversion using DMA for Data transfer
@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file ADC/ADC_RegularConversion_DMA/readme.txt
* @author MCD Application Team
* @brief Description of the ADC RegularConversion DMA example.
******************************************************************************
* @attention
*
* Copyright (c) 2017 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 use the ADC2 and DMA to transfer continuously converted data from
ADC2 to memory.
The ADC2 is configured to convert continuously ADC_CHANNEL_5.
Each time an end of conversion occurs the DMA transfers, in circular mode, the
converted data from ADC2 DR register to the uhADCxConvertedValue variable.
In this example, the system clock is 180MHz, APB2 = 90MHz, APB1 = 45MHz
and ADC clock = APB2/4 = 22.5MHz.
Since ADC2 clock is 22.5 MHz and sampling time is set to 3 cycles, the conversion
time to 12bit data is 12 cycles so the total conversion time is (12+3)/22.5= 0.66us (1.5 Mega-sample/sec)
User can vary the ADC_CHANNEL_5 voltage by applying an input voltage on pin PA5 (e.g. using signal generator)
STM32 Discovery boards LEDs can be used to monitor the transfer status:
- LED1 is ON when the conversion is complete.
- LED3 is ON when there is an error in ADC initialization, in ADC channel configuration
or during conversion process.
@note The connection of the LCD reset pin to a dedicated GPIO PH7 instead of the STM32F469 NRST pin may cause residual display on LCD with applications/examples that do not require display.
The LCD clear can be ensured by hardware through the boards power off/power on or by software calling the BSP_LCD_Reset() function.
@par Keywords
Analog, ADC, Analog to Digital Converter, Regular Conversion, DMA, Continuous Conversion
@par Directory contents
- ADC/ADC_RegularConversion_DMA/Inc/stm32f4xx_hal_conf.h HAL configuration file
- ADC/ADC_RegularConversion_DMA/Inc/stm32f4xx_it.h DMA interrupt handlers header file
- ADC/ADC_RegularConversion_DMA/Inc/main.h Header for main.c module
- ADC/ADC_RegularConversion_DMA/Src/stm32f4xx_it.c DMA interrupt handlers
- ADC/ADC_RegularConversion_DMA/Src/main.c Main program
- ADC/ADC_RegularConversion_DMA/Src/stm32f4xx_hal_msp.c HAL MSP file
- ADC/ADC_RegularConversion_DMA/Src/system_stm32f4xx.c STM32F4xx system source file
@par Hardware and Software environment
- This example runs on STM32F469xx devices.
- This example has been tested with STM32469I-DISCOVERY 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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