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115 lines
5.3 KiB
Plaintext
115 lines
5.3 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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* @attention
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*
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* Copyright (c) 2017 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 ADC peripheral to convert a regular channel in Triple
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interleaved mode.
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The ADC1, ADC2 and ADC3 are configured to convert ADC_CHANNEL_10, with conversion
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triggered by software.
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The Triple interleaved delay is configured to 5 ADC clk cycles (ADC_TWOSAMPLINGDELAY_5CYCLES).
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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 ADC1, ADC2 and ADC3 are configured to convert ADC Channel 12.
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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 = 36 MHz and Conversion rate = 5 cycles
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==> Conversion Time = 36M/5cyc = 7.2Msps.
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Please select PC0 option on JP3 jumper called Potentiometer
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The ADC measure is realized on PC.00, so you need to connect this pin to a power supply (do not forget to connect the power supply
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GND to the EVAL board GND).
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STM32 boards LEDs can be used to monitor the transfer status:
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- LED1 is ON when the 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 need 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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@note The connection of the LCD reset pin to a dedicated GPIO PK7 instead of the STM32F469 NRST pin may cause residual display on LCD with applications/examples that do not require display.
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The LCD clear can be ensured by hardware through the boards power off/power on or by software calling the BSP_LCD_Reset() function.
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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 DMA interrupt handlers header file
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- ADC/ADC_TripleModeInterleaved/Inc/main.h Header for main.c module
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- ADC/ADC_TripleModeInterleaved/Src/stm32f4xx_it.c DMA 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 file
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- ADC/ADC_TripleModeInterleaved/Src/system_stm32f4xx.c STM32F4xx system source file
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- ADC/ADC_TripleModeInterleaved/simulation.xls Draw to clarify explanation (readme extension)
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@par Hardware and Software environment
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- This example runs on STM32F469xx/STM32F479xx devices.
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- This example has been tested with STM32469I-EVAL RevC evaluation board and can be
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easily tailored to any other supported device and development board.
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- STM32469I-EVAL RevC Set-up
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- Use the Potentiometer (RV1) of the Eval board (connected to PC.0).
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- Make sure that JP3 is fitted in 2-3 positions to use potentiometer.
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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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