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Pull request #17: CITD-425:code-examples 3
Merge in MCU16CE/dspic33e-code-examples from ~I62773/dspic33e-code-examples:feature/CITD-425-code-examples-3 to develop * commit '4a5ba3203a017fe95b31315cc9de64a4fc361ceb': Updated Readme file Updated review comments Updated review comments CITD-425:Updated content version CITD-425:code-examples
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‎dspic33e-adc-altsamp/.main-meta/main.json

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{
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"metaDataVersion":"1.0.0",
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"category":"com.microchip.ide.project",
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"content":{
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"metaDataVersion":"1.3.0",
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"name":"com.microchip.mplabx.project.dspic33e-adc-altsamp",
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"version":"1.0.0",
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"displayName":"ADC Alternate Sampling",
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"projectName":"dspic33e-adc-altsamp",
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"shortDescription":"ADC Alternate Sampling",
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"ide":{
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"name":"MPLABX",
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"semverRange":">=6.00"
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},
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"compiler":{
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"name":"XC16",
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"semverRange":"^2.00"
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},
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"dfp":{
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"name":"dsPIC33E-GM-GP-MC-GU-MU_DFP",
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"semverRange":"^1.3.85"
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},
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"device":{
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"metaDataVersion":"1.0.0",
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"category":"com.microchip.portal.contentRef",
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"content":{
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"metaDataVersion":"1.0.0",
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"category":"com.microchip.device",
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"name":"dsPIC33EP512MU810",
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"versionRange":"*"
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}
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},
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"peripherals":[
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"TMR",
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"DMA",
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"ADC"
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],
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"keywords":[
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"TMR",
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"DMA",
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"ADC"
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]
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}
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}

‎dspic33e-adc-altsamp/README.md

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![image](../images/microchip.jpg)
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## ADC Alternate Sampling
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## Description:
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In this example, Timer 3 is setup to time-out every 125 microseconds (8Khz Rate).
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As a result, the module will stop sampling and trigger a A/D conversion on every Timer3 time-out, i.e., Ts=125us.
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ADC is configured in 10bit mode to alternatively sample AN4/AN5 analog input on Timer 3 interrupt.
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It will take TWO Timer3 Timeout period to sample AN4 first and then AN5.
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ADC module clock time period is configured as Tad=Tcy*(ADCS+1)= (1/60M)*64 = 1.06us (625Khz).
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Hence the conversion time for 10-bit A/D Conversion Time Tc=12*Tad = 12.72us
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DMA is used to sort and transfer the converted data to DMA RAM. DMA is configured in ping-pong mode
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and it transfers 16samples of each of the TWO analog inputs and generates interrupt.
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DMA channel 0 is configured in ping-pong mode to move the converted data from ADC to DMA RAM
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on every sample/convert sequence.
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First, DMA uses DMA0STA base address to store the ADC samples and it generates interrupt
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after transfering (TWO x 16 samples = 32 samples).
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Next, DMA uses DMA0STB base address to store the ADC samples and it generates interrupt
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after transfer (TWO x 16 samples = 32 samples).
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Above process repeats continuously.
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void \_\_attribute\_\_((\_\_interrupt\_\_)) _DMA0Interrupt(void);
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DMA interrupt service routine, moves the data from DMA buffer to ADC signal buffer
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Timer time outs at 60M/(4999+1) = 12000 Hz.
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DMA interrupt @ 12K/32= 375 Hz.
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I/O pin toggles at 375/2= 187 Hz.
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RA4 pin is toggled in ISR, hence it will be toggling at ~ 187Hz
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## Hardware Used
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- Explorer 16/32 Development Board (https://www.microchip.com/DM240001-2)
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- dsPIC33EP512GM710 PIM (https://www.microchip.com/ma330035) or dsPIC33EP512MU810 PIM (https://www.microchip.com/MA330025-1) or dsPIC33EP256GP506 PIM (https://www.microchip.com/MA330030)
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## Software Used
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- MPLAB® X IDE v6.00 or newer (https://www.microchip.com/mplabx)
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- MPLAB® XC16 v2.00 or newer (https://www.microchip.com/xc)
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‎dspic33e-adc-altsamp/firmware/dspic33e-adc-altsamp.X/Makefile

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#
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# There exist several targets which are by default empty and which can be
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# used for execution of your targets. These targets are usually executed
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# before and after some main targets. They are:
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#
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# .build-pre: called before 'build' target
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# .build-post: called after 'build' target
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# .clean-pre: called before 'clean' target
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# .clean-post: called after 'clean' target
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# .clobber-pre: called before 'clobber' target
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# .clobber-post: called after 'clobber' target
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# .all-pre: called before 'all' target
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# .all-post: called after 'all' target
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# .help-pre: called before 'help' target
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# .help-post: called after 'help' target
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#
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# Targets beginning with '.' are not intended to be called on their own.
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#
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# Main targets can be executed directly, and they are:
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#
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# build build a specific configuration
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# clean remove built files from a configuration
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# clobber remove all built files
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# all build all configurations
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# help print help mesage
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#
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# Targets .build-impl, .clean-impl, .clobber-impl, .all-impl, and
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# .help-impl are implemented in nbproject/makefile-impl.mk.
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#
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# Available make variables:
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#
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# CND_BASEDIR base directory for relative paths
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# CND_DISTDIR default top distribution directory (build artifacts)
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# CND_BUILDDIR default top build directory (object files, ...)
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# CONF name of current configuration
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# CND_ARTIFACT_DIR_${CONF} directory of build artifact (current configuration)
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# CND_ARTIFACT_NAME_${CONF} name of build artifact (current configuration)
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# CND_ARTIFACT_PATH_${CONF} path to build artifact (current configuration)
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# CND_PACKAGE_DIR_${CONF} directory of package (current configuration)
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# CND_PACKAGE_NAME_${CONF} name of package (current configuration)
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# CND_PACKAGE_PATH_${CONF} path to package (current configuration)
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#
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# NOCDDL
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# Environment
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MKDIR=mkdir
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CP=cp
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CCADMIN=CCadmin
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RANLIB=ranlib
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# build
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build: .build-post
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.build-pre:
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# Add your pre 'build' code here...
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.build-post: .build-impl
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# Add your post 'build' code here...
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# clean
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clean: .clean-post
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.clean-pre:
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# Add your pre 'clean' code here...
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# WARNING: the IDE does not call this target since it takes a long time to
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# simply run make. Instead, the IDE removes the configuration directories
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# under build and dist directly without calling make.
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# This target is left here so people can do a clean when running a clean
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# outside the IDE.
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.clean-post: .clean-impl
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# Add your post 'clean' code here...
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# clobber
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clobber: .clobber-post
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.clobber-pre:
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# Add your pre 'clobber' code here...
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.clobber-post: .clobber-impl
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# Add your post 'clobber' code here...
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# all
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all: .all-post
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.all-pre:
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# Add your pre 'all' code here...
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.all-post: .all-impl
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# Add your post 'all' code here...
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# help
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help: .help-post
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.help-pre:
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# Add your pre 'help' code here...
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.help-post: .help-impl
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# Add your post 'help' code here...
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# include project implementation makefile
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include nbproject/Makefile-impl.mk
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# include project make variables
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include nbproject/Makefile-variables.mk

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