Component: ADC Template (Analog Input)

Author	Matrix Ltd
Version	1.3
Category	Analog Input

ADC Template component

Base ADC component with no graphical interface. Contains all of the embedded side component calls to provide an ADC interface suitable for wrapping with a new ADC style component.

Component Source Code

Please click here to download the component source project: FC_Comp_Source_adc_Base.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_adc_Base.fcfx

Detailed description

No detailed description exists yet for this component

Examples

Read a 8-bit Byte

Simple ADC example allowing analogue values to be read on ADC inputs AN0 and AN1 as a byte, these are then displayed on the LCD connected to PortB as a number ranging from 0-255 representing 0V to VCC.

ADCByte

Read a 10-bit or 12-bit sample

Simple ADC example allowing analogue values to be read on ADC inputs AN0 and AN1 as a 10 or 12-bit value depending on the target microcontroller, these are then displayed on the LCD connected to PortB as a number ranging from 0-1023 or 0-4095 representing 0V to VCC.

ADCInt

Reading a sample as a Voltage

Simple ADC example allowing analogue Voltages to be read on ADC inputs AN0 and AN1, these are then displayed on the LCD connected to PortB in Volts from 0.0V-VCC. The VRef Voltage property needs to be correct for the Voltage to be calculated correctly.

ADCVoltage

Filtering ADC Inputs

Simple example which uses a filtering technique to provide a digital low pass filter on the ADC readings. The output of the filter is 50% the ADC reading and 50% the previous reading.

LPFilter

In this example the output of the filter is 25% the ADC reading and 75% the previous reading.

LPFilter2

Analogue Inputs Window

The Analogue inputs window available from the View menu allows you to see the values for all of the analogue inputs which are active in your program. They can also be manually altered by dragging the mouse along one of the sliders.

Chip Diagram

Active analogue inputs are highlighted in yellow on the chip diagram.

Scope Window

An ADC based component will automatically add a trace to the data recorder window allowing you to get a view of the analogue data over time during simulation.

Based on the Scope Traces component property.

Macro reference

	RawSampleInt
Background call to read the ADC at full bit depth Call Enable() first
- UINT	Return

	RawAverageByte
Background call to read the ADC as a byte average sample over time Call Enable() before this
- BYTE	NumSamples
- BYTE	DelayUs
Number of micro seconds in between taking each sample
- BYTE	Return

	GetSampleBits
Gets the number of bits per sample
- BYTE	Return

	GetString
Reads the ADC as a direct voltage and returns as a string
- STRING	Return

	GetAverageByte
Function call to read the ADC as a byte average sample over time
- BYTE	NumSamples
- BYTE	DelayUs
Number of micro seconds in between taking each sample
- BYTE	Return

	RawAverageInt
Background call to read the ADC as a full width average sample over time Call Enable() before this
- BYTE	NumSamples
- BYTE	DelayUs
- INT	Return

	GetSpeedFilter
Gets the Conversion speed filter string Use in Component.Property.SetFilter()
- STRING	Return

	GetAverageInt
Function call to read the ADC as a full width average sample over time
- BYTE	NumSamples
- BYTE	DelayUs
Number of micro seconds in between taking each sample
- UINT	Return

	SetProperties
Set the VRef options and voltage, ConvSpeed and AcqTime for the ADC component.
- INT	VRef10Ms
Voltage Reference x10 mV - Default 500 = 5V
- BOOL	VRefOpt
External VRef 0=Disabled, 1=Enabled
- INT	ConvSpdOpt
Conversion Speed Setting - Refer to numbered list
- INT	Aquisitions
Aquisition time in micro seconds to precharge before sampling
- VOID	Return

	GetVoltage
Reads the ADC as a direct voltage
- FLOAT	Return

	RawEnable
Enables and configures the ADC channel to be an analogue input. Only one ADC channel can be enabled at a time. Any RAW functions will reference the last enabled channel only.
- VOID	Return

	SetChannel
Sets the channel ID for the component
- INT	ChannelId
Chaannel starting at 0, -1 is unconnected
- VOID	Return

	RawSampleByte
Background call to read the ADC as a byte Call Enable() before this
- BYTE	Return

	GetInt
Blocking call to read the ADC at full bit depth
- UINT	Return

	RawDisable
Disables the previously enabled ADC channel and converts back to digital mode.
- VOID	Return

	GetByte
Blocking call to read the ADC as a byte
- BYTE	Return

Property reference

	Properties
	Connections
	Channel
Analogue Input Channel - Which pin is the analogue input connected to?
	Settings
	VRef voltage
Used by the GetVoltage or GetString component macros to take an ADC reading and convert it into a Voltage. +VRef voltage x 10mV Default 500 = 5.0V
	VRef option
Defines what is used as the ADC maximum reference. ADC Range = GND to VRef Voltage VDD - Defines the microcontrollers power supply pin as the max reference, VREF+ Pin - Dedicated pin on the microcontroller to allow for a variable reference voltage.
	Conversion speed
Clock setting to select how fast the ADC peripheral will perform an ADC conversion. The FRC setting is based on a RC time base and so will vary with temperature and pressure. Other settings are generally based on divisions of the master clock.
	Acquisition cycles
Number of micro seconds to wait for the ADC input to charge before starting the analogue sample.
	Bit Depth
Maximum number of digital bits the ADC can sample. 8 bit = ADC range 0 - 255 10 bit = ADC range 0 - 1023 12 bit = ADC range 0 - 4095
	Simulation
	Scope Traces
Selects if the scope traces are automatically generated or not