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125 lines
6.0 KiB
Plaintext
125 lines
6.0 KiB
Plaintext
/**
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@page ADC_TripleModeInterleaved Use ADC1, ADC2 and ADC3 in Triple interleaved mode and DMA mode2 with 6Msps
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file ADC/ADC_TripleModeInterleaved/readme.txt
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* @author MCD Application Team
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* @brief Description of the Triple interleaved mode and DMA mode2 example
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******************************************************************************
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 ADC peripheral to convert a regular channel in Triple
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interleaved mode.
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The Triple interleaved delay is configured 5 ADC clk cycles.
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In Triple ADC mode, three DMA requests are generated:
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- On the first request, both ADC2 and ADC1 data are transferred (ADC2 data take
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the upper half-word and ADC1 data take the lower half-word).
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- On the second request, both ADC1 and ADC3 data are transferred (ADC1 data take
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the upper half-word and ADC3 data take the lower half-word).
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- On the third request, both ADC3 and ADC2 data are transferred (ADC3 data take
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the upper half-word and ADC2 data take the lower half-word) and so on.
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On each DMA request (two data items are available) two half-words representing
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two ADC-converted data items are transferred as a word.
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A DMA request is generated each time 2 data items are available :
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1st request: ADC_CDR[31:0] = (ADC2_DR[15:0] << 16) | ADC1_DR[15:0] (step1)
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2nd request: ADC_CDR[31:0] = (ADC1_DR[15:0] << 16) | ADC3_DR[15:0] (step2)
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3rd request: ADC_CDR[31:0] = (ADC3_DR[15:0] << 16) | ADC2_DR[15:0] (step3)
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4th request: ADC_CDR[31:0] = (ADC2_DR[15:0] << 16) | ADC1_DR[15:0] (step1) and so on.
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The conversion is triggered by software.
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The ADC1, ADC2 and ADC3 are configured to convert ADC Channel 12.
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By this way, the ADC can reach 6Msps, in fact the same channel is converted
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each 5 cycles
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In this example, the system clock is 144MHz, APB2 = 72MHz and ADC clock = APB2 /2.
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Since ADCCLK= 36MHz and Conversion rate = 5 cycles
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==> Conversion Time = 36M/5cyc = 7.2Msps
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STM32 Eval board's LEDs can be used to monitor the transfer status:
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- LED1 is ON when ADC conversion is complete.
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- LED3 is ON when there are an error in initialization.
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User should monitor aADCTripleConvertedValue variable to get the converted value.
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@note Refer to "simulation.xls" file to have the diagram simulation of the example.
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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 Keywords
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Analog, ADC, Analog to Digital, Triple mode, Interleaved, Continuous conversion, Software Trigger, DMA, Measurement,
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@par Directory contents
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- ADC/ADC_TripleModeInterleaved/Inc/stm32f4xx_hal_conf.h HAL configuration file
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- ADC/ADC_TripleModeInterleaved/Inc/stm32f4xx_it.h Interrupt handlers header file
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- ADC/ADC_TripleModeInterleaved/Inc/main.h Main program header file
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- ADC/ADC_TripleModeInterleaved/Src/stm32f4xx_it.c Interrupt handlers
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- ADC/ADC_TripleModeInterleaved/Src/main.c Main program
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- ADC/ADC_TripleModeInterleaved/Src/stm32f4xx_hal_msp.c HAL MSP module
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- ADC/ADC_TripleModeInterleaved/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
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@par Hardware and Software environment
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- This example runs on STM32F429xx/STM32F439xx devices.
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- This example has been tested with STM324x9I-EVAL RevB evaluation board and can be
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easily tailored to any other supported device and development board.
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- STM324x9I-EVAL RevB Set-up
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- Connect PC.2 to a power supply (do not forget to connect the power supply GND
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to the EVAL board GND)
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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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* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
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*/
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