122 lines
5.8 KiB
Plaintext
122 lines
5.8 KiB
Plaintext
/**
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@page ADC_DualModeInterleaved Two ADC in multimode dual-mode interleaved, transfer by DMA
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file ADC/ADC_DualModeInterleaved/readme.txt
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* @author MCD Application Team
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* @brief Description of the Dual interleaved mode @18MSamplesPerSec 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 two ADC peripherals to perform conversions in dual interleaved mode.
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One compilation switch is available to select ADC configuration continuous mode
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and external trigger (located in main.h):
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- "ADC_TRIGGER_FROM_TIMER" defined: ADC is operating in not continuous mode
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and conversions are trigger by external trigger: timer.
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- "ADC_TRIGGER_FROM_TIMER" not defined: ADC is operating in continuous mode
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and first conversion is trigger by software trigger.
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One compilation switch is available to generate a waveform voltage
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for test (located in main.h):
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- "WAVEFORM_VOLTAGE_GENERATION_FOR_TEST" defined: For this example purpose, generates a
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waveform voltage on a spare DAC channel DAC_CHANNEL_1 (pin PA.04),
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so user has just to connect a wire between DAC channel output and ADC input to run this example.
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- "WAVEFORM_VOLTAGE_GENERATION_FOR_TEST" not defined: no voltage is generated, user has
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to connect a voltage source to the selected ADC channel input to run this example.
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Note: In this example, ADC sampling rate is not set as the highest possible (ADC parameters not set for this purpose: resolution 12 bits, ... ).
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ADC sampling rate can be increased by modifying resolution and sampling time, but this will decrease the conversion accuracy.
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Other peripherals related to ADC are used:
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Mandatory:
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- GPIO peripheral is used in analog mode to drive signal from device pin to
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ADC input.
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Optionally:
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- Timer peripheral is used to trigger ADC conversions.
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- DMA peripheral is used to transfer ADC converted data.
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Both ADC are using the same DMA (DMA of ADC master).
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ADC conversion results:
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- ADC conversions results are transferred automatically by DMA, into variable
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array "aADCDualConvertedValues".
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ADC master and ADC slave results are concatenated on data register 32 bits of ADC master:
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- ADC master results in the 16 LSB [15:0] (with ADC resolution 12 bits, bits effectively used are [11:0])
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- ADC slave results in the 16 MSB [31:16] (with ADC resolution 12 bits, bits effectively used are [27:16])
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- DMA are configured to operate continuously, in circular mode.
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Data is transferred by words every ADC1+ADC2 conversions.
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When DMA transfer half-buffer and complete buffer length are reached, callbacks
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HAL_ADC_ConvCpltCallback() and HAL_ADC_ConvCpltCallback() are called.
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- For the purpose of this example, dual conversion values are
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dispatched into 2 arrays corresponding to each ADC conversion values
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(aADCxConvertedValues, aADCyConvertedValues)
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Board settings:
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ADC1 and ADC2 are configured to convert the same channel: ADC_CHANNEL_4 (pin PA.04).
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- The voltage input on ADC channel is provided from DAC channel (if compilation switch "WAVEFORM_VOLTAGE_GENERATION_FOR_TEST" is defined)
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ADC and DAC channel have been chosen to have the same pad shared at device level: pin PA.04
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==> Therefore, there is no external connection needed to run this example.
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STM3210C-EVAL RevC board LED is used to monitor the program execution status:
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- Normal operation: LED_GREEN is turned-on/off in function of ADC conversion
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status:
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- Turned-off if ADC conversions buffer is not full
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- Turned-on if ADC conversions buffer is full
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- Error: In case of error, LED_RED is toggling at a frequency of 1Hz.
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@note See document "ADC timing simulation DualMode.xls" describing the conversions timing.
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@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
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based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
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a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
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than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
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To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
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@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
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to have correct HAL operation.
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@par Directory contents
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- ADC/ADC_DualModeInterleaved/Inc/stm32f1xx_hal_conf.h HAL configuration file
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- ADC/ADC_DualModeInterleaved/Inc/stm32f1xx_it.h DMA interrupt handlers header file
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- ADC/ADC_DualModeInterleaved/Inc/main.h Header for main.c module
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- ADC/ADC_DualModeInterleaved/Src/stm32f1xx_it.c DMA interrupt handlers
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- ADC/ADC_DualModeInterleaved/Src/main.c Main program
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- ADC/ADC_DualModeInterleaved/Src/stm32f1xx_hal_msp.c HAL MSP file
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- ADC/ADC_DualModeInterleaved/Src/system_stm32f1xx.c stm32f1xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F1xx with at least 2 ADC instances devices.
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- This example has been tested with STM3210C-EVAL RevC 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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