92 lines
4.1 KiB
Plaintext
92 lines
4.1 KiB
Plaintext
/**
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@page DAC_GenerateConstantSignal_TriggerSW DAC example
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@verbatim
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******************************************************************************
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* @file Examples_LL/DAC/DAC_GenerateConstantSignal_TriggerSW/readme.txt
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* @author MCD Application Team
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* @brief Description of the DAC_GenerateConstantSignal_TriggerSW example.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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How to use the DAC peripheral to generate a constant voltage signal. This
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example is based on the STM32F7xx DAC LL API. The peripheral
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initialization uses LL unitary service functions for optimization purposes
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(performance and size).
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Example configuration:
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One DAC channel (DAC1 channel1) is configured to connect DAC channel output on GPIO pin
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to get the samples from SW (no DMA transfer) and to get conversion trigger from SW.
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Example execution:
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From the main program execution, LED1 is toggling quickly while waiting for
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user button press.
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Then, the DAC is configured and activated: constant signal is generated on DAC output
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indefinitely.
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DAC channel output value is provided by SW, a new value is loaded
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at each press on push button: LED1 toggles and the signal starts from 0, increased by a quarter of Vdda and
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finishing at Vdda voltage.
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Finally, LED1 is turned-on.
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Connection needed:
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None.
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Oscilloscope for monitoring DAC channel output (cf pin below).
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Other peripheral used:
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1 GPIO for push button
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1 GPIO for DAC channel output PA.04 (Board Nucleo144: morpho connector CN11 pin 32 (in front of Arduino connector CN9 pin A2), Zio connector CN7 pin 17)
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@par Keywords
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Analog, DAC, Conversion, Voltage output, Oscilloscope, Signal, Software trigger,
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@Note<74>If the user code size exceeds the DTCM-RAM size or starts from internal cacheable memories (SRAM1 and SRAM2),that is shared between several processors,
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<20><><EFBFBD><EFBFBD><EFBFBD>then it is highly recommended to enable the CPU cache and maintain its coherence at application level.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>The address and the size of cacheable buffers (shared between CPU and other masters) must be properly updated to be aligned to cache line size (32 bytes).
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@Note It is recommended to enable the cache and maintain its coherence, but depending on the use case
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> It is also possible to configure the MPU as "Write through", to guarantee the write access coherence.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>In that case, the MPU must be configured as Cacheable/Bufferable/Not Shareable.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Even though the user must manage the cache coherence for read accesses.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Please refer to the AN4838 <20>Managing memory protection unit (MPU) in STM32 MCUs<55>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Please refer to the AN4839 <20>Level 1 cache on STM32F7 Series<65>
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@par Directory contents
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- DAC/DAC_GenerateConstantSignal_TriggerSW/Inc/stm32f7xx_it.h Interrupt handlers header file
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- DAC/DAC_GenerateConstantSignal_TriggerSW/Inc/main.h Header for main.c module
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- DAC/DAC_GenerateConstantSignal_TriggerSW/Inc/stm32_assert.h Template file to include assert_failed function
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- DAC/DAC_GenerateConstantSignal_TriggerSW/Src/stm32f7xx_it.c Interrupt handlers
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- DAC/DAC_GenerateConstantSignal_TriggerSW/Src/main.c Main program
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- DAC/DAC_GenerateConstantSignal_TriggerSW/Src/system_stm32f7xx.c STM32F7xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F767xx devices.
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- This example has been tested with NUCLEO-F767ZI board and can be
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easily tailored to any other supported device and development board.
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@par How to use it ?
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In order to make the program work, you must do the following :
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- Open your preferred toolchain
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- Rebuild all files and load your image into target memory
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- Run the example
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*/
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