CDSP

Process data output from ADC peripherals of IFX TC4x

Since R2024a

Libraries:
Embedded Coder Support Package for Infineon AURIX TC4x Microcontrollers / AURIX TC4x

Description

The Converter Digital Signal Processing (CDSP) block applies signal processing techniques to data from DSADC block. Based on the filter properties and filter chain that you specify in the block, the block outputs the filtered data as 16-bit signed and unsigned integers.

When you enable the timestamp output, the block provides an additional output port to read the timestamp as a 16-bit unsigned value.

Ports

Input

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primary input — Input data from DSADC
scalar

The port accepts incoming data from DSADC block (using on-chip or external modulator) and applies different signal processing techniques based on the application.

Note

In a code generation workflow, the port accepts data from DSADC block
In a simulation workflow, the port accepts data from any Simulink^® source block

Data Types: uint16 | int16

secondary input — Input data to use in Math filter
scalar

The port accepts incoming data from DSADC block (using on-chip or external modulator) and uses this secondary input data for addition or subtraction with CDSP secondary input in the Math filter block.

Dependencies

To view the secondary input port, set the DSP Filter chain parameter to Advanced average 1 (FC1), Basic data accumulation (FC2), or Advanced average 2 (FC4). This choice adds a Math tab, where you must set the Math operation parameter to Addition with CDSP secondary input or subtraction with CDSP secondary input

Data Types: uint16 | int16

Output

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filtereddata — 16-bit filtered data
vector

The block outputs the filtered data as 16-bit values in the form of an N-by-1 array. N varies based on based on the timestamp, number of output samples, and FIFO depth configuration.

The size of output depends on the values of the other parameters in the block.

Enable FIFO	Enable timestamp output	Number of output samples	FIFO depth	Size of filtereddata
Disable	Disable	NA	NA	1-by-1
Disable	Enable	NA	NA	1-by-1
Enable	Disable	1	4	4-by-1
			3	3-by-1
			2	2-by-1
			1	1-by-1
		2	4	4-by-1
		2	2	2-by-1
	Enable	1	4	3-by-1
			3	2-by-1
			2	1-by-1
		2	4	3-by-1

Data Types: uint16 | int16

timestamp — Timestamp of 16-bit counter value
`scalar`

The port outputs the status of the 16-bit counter value of timestamp counter.

Dependencies

To enable this port, select the Enable timestamp output parameter.

Data Types: uint16

Parameters

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Filter Config

Enable timestamp output — Option to enable timestamp output
`off` (default) | `on`

Select this parameter to configure the timestamp output port.

Selecting this parameter enables options in the Timestamp tab and Timestamp event (under Events tab) in the CDSP Peripheral Configuration.

Note

As the timestamp is always associated with the trigger, it is recommended that you configure and provide the trigger accordingly, when the timestamp is enabled. Otherwise, the FIFO functionality does not work, as timestamp is flushed into FIFO first and then to the result registers.

DSP Filter chain — Option to select filter chain
`Demo FIR (FC0)` (default) | `Advanced average 1 (FC1)` | `Basic data accumulation (FC2)` | `Advanced median (FC3)` | `Advanced average 2 (FC4)` | `Basic AURIX (FCM)`

Select the filter chain to be used by the CDSP block.

Demo FIR (FC0): Select this option to use the finite impulse response (FIR) filter block.
Advanced average 1 (FC1): Select this option to use the filter blocks in the predefined sequence of FIR > (sixth-order infinite impulse response filter) IIR6 > Math filter (MAT) > Average filter (AVG).
Basic data accumulation (FC2): Select this option to use the filter blocks in the predefined sequence of FIR > IIR6 > MAT > Data accumulation filter (DA).
Advanced median (FC3): Select this option to use the filter blocks in the predefined sequence of FIR > IIR6 > Median filter (MDN).
Advanced average 2 (FC4): Select this option to use the filter blocks in the predefined sequence of IIR6 > FIR > MAT > AVG.
Basic AURIX (FCM): Select this option to use the filter blocks in the predefined sequence of FIR > (first-order infinite impulse response filter) IIR1 > DA.

The block adds the FIR, IIR6, IIR1, MAT, AVG, and DA tabs in the block parameters window depending on the choice of the DSP filer chain parameter. You can set the parameters of the filter block in these tabs.

Output datatype — Data type of filtered output
`int16` (default) | `uint16`

Select data type of the filtered output.

Filter Config > FIFO Configuration

Enable FIFO — Option to enable first-in first-out (FIFO) register
`off` (default) | `on`

Select to enable FIFO register.

Elements to retrieve from FIFO — Output samples to read from FIFO
`1` (default) | `2`

Configure whether to read a single sample or double samples at a time.

Selecting 2 helps in fetching the data faster from the FIFO.

Dependencies

To enable this parameter, select the Enable FIFO parameter.

FIFO depth — FIFO register depth
`4` (default) | `3` | `2` | `1` (only if 'Enable Timestamp' is not selected)

FIFO level after which the module generates service request.

Dependencies

To view this parameter, select the Enable FIFO parameter.

FIR

Bypass FIR block — Option to bypass FIR block in the filter chain
`off` (default) | `on`

Select to bypass FIR block in the filer chain.

Coefficients — Coefficients of FIR filter
`[8, 13, -39, -130, -170, -135, -68, 27, 220, 424, 400, 124, -268, -617, -763, -604, -74, 655, 1244, 1419, 971, -26, -1390, -2569, -2842, -1783, 736, 4316, 8296, 11711, 13682, 13682, 11711, 8296, 4316, 736, -1783, -2842, -2569, -1390, -26, 971, 1419, 1244, 655, -74, -604, -763, -617, -268, 124, 400, 424, 220, 27, -68, -135, -170, -130, -39, 13, 8]` (default) | scalar in the range (-32767 to 32767) | vector in the range (-32767 to 32768)

Specify the FIR filter coefficients of size ranging from 1-by-1 to 1-by-128.

Dependencies

To enable this parameter, disable the Bypass FIR block parameter.

Decimation rate — Ratio of input data rate to output data rate in the FIR filter
`1` (default) | `2` | `4` | `8` | `16`

Specify the ratio of input data rate to output data rate in the FIR filter.

Note

In a code generation workflow, the block supports decimation rate ranging from 1 to 16 .
In a simulation workflow, the block supports a decimation rate of 1.

Dependencies

To enable this parameter, disable the Bypass FIR block parameter.

IIR6

Bypass IIR6 block — Option to bypass IIR6 filter block in the filter chain
`off` (default) | `on`

Select to bypass IIR6 filter block in the filer chain.

Coefficients — Coefficients of IIR6 filter
`[16384, 0, 0, 16384, 0, 0, 16384, 0, 0, 16384, 0, 0, 16384, 0, 0, 16384, 0, 0]` (default) | vector in the range (-32767 to 32768)

Specify the 1-by-18 filter coefficients in the sequence of [a₀₀, a₀₁, a₀₂, a₁₀, a₁₁, a₁₂, a₂₀, a₂₁, a₂₂, b₀₀, b₀₁, b₀₂, b₁₀, b₁₁, b₁₂, b₂₀, b₂₁, b₂₂] for the IIR6 filter with the transfer function:

$\frac{b_{00} + b_{01} z^{- 1} + b_{02} z^{- 2}}{a_{00} + a_{01} z^{- 1} + a_{02} z^{- 2}} \times \frac{b_{10} + b_{11} z^{- 1} + b_{12} z^{- 2}}{a_{10} + a_{11} z^{- 1} + a_{12} z^{- 2}} \times \frac{b_{20} + b_{21} z^{- 1} + b_{22} z^{- 2}}{a_{20} + a_{21} z^{- 1} + a_{22} z^{- 2}}$

Dependencies

To enable this parameter, disable the Bypass IIR6 block parameter.

Decimation rate — Ratio of input data rate to output data rate in the IIR6 filter
`1` (default) | `2` | `4` | `8` | `16`

Specify the ratio of input data rate to output data rate in the IIR6 filter.

Note

In a code generation workflow, the block supports decimation rate ranging from 1 to 16 .
In a simulation workflow, the block supports a decimation rate of 1.

Dependencies

To enable this parameter, disable the Bypass IIR6 block parameter.

Bit extension — Number of bits to shift in the input and output data of the IIR6 filter block
`0` (default) | scalar in the range (0, 7)

Specify the number of bits to shift in the IIR6 filter block to improve precision.

Dependencies

To enable this parameter, disable the Bypass IIR6 block parameter.

Math

Bypass math block — Option to bypass Math filter block in the filter chain
`off` (default) | `on`

Select to bypass Math filter block in the filer chain.

Math operation — Option to select the mathematical operation
`Addition with constant` (default) | `Addition with CDSP secondary input` | `Subtraction with constant` | `Subtraction with CDSP secondary input` | `Multiplication with constant`

Specify the mathematical operation for the Math filter.

If you choose the Addition with CDSP secondary input or Subtraction with CDSP secondary input, the CDSP block adds an input port for the secondary input.

Dependencies

To enable this parameter, disable the Bypass math block parameter.

Constant value (-32768 to 32767) — Option to provide the constant value for the mathematical operation
`0` (default) | scalar in the range (-32768 to 32767)

Specify the constant value to use in the Math filter.

Dependencies

To enable this parameter, disable the Bypass math block parameter and set the .Math operation parameter to Addition with constant, Subtraction with constant, or Multiplication with constant.

Bit shift after math operation (-32 to 32) — Number of bits for arithmetic right-shift on the Math filtered output
`0` (default) | scalar in the range (-32 to 32)

Specify the number of bits for arithmetic right-shift operation on the Math filtered output to correct the output in case of overflow.

Dependencies

To enable this parameter, disable the Bypass math block parameter.

Average

Bypass avegare block — Option to bypass AVG filter block in the filter chain
`off` (default) | `on`

Select to bypass average filter block in the filer chain.

Number of samples — Option to select the number of samples for averaging operation
`1` (default) | `2` | `4` | `8` | `16` | `32` | `64` | `128`

Specify the number of samples to consider for averaging operation.

Dependencies

To enable this parameter, disable the Bypass average block parameter.

Median

Bypass median block — Option to bypass MDN filter block in the filter chain
`off` (default) | `on`

Select to bypass MDN filter block in the filer chain.

Number of samples — Option to select the number of samples median operation
`1` (default) | `3` | `5` | `7` | `9`

Specify the number of samples to consider for median filter.

Dependencies

To enable this parameter, disable the Bypass median block parameter.

IIR1

Bypass IIR1 block — Option to bypass IIR1 filter block in the filter chain
`off` (default) | `on`

Select to bypass IIR1 filter block in the filer chain.

Dependencies

To enable this parameter, disable the Bypass IIR1 block parameter.

Coefficients — Coefficients of IIR6 filter
`[16384, -12288, 16384, -16384]` (default) | vector in the range (-32767 to 32768)

Specify the 1-by-4 filter coefficients in the sequence of [a₀, a₁, b₀, b₁] for the IIR1 filter with transfer function:

$\frac{b_{0} + b_{1} z^{- 1}}{a_{0} + a_{1} z^{- 1}}$

Dependencies

To enable this parameter, disable the Bypass IIR1 block parameter.

DA

Bypass DA block — Option to bypass DA filter block in the filter chain
`off` (default) | `on`

Select to bypass DA filter block in the filer chain.

Disable this parameter to configure data accumulation parameters in the Integrator Control tab in CDSP Peripheral Configuration tool.

Samples in accumulation cycle — Option to select the number of data samples per accumulation cycle
`1` (default) | scalar in the range (1, 512)

Specify the number of data samples per accumulation cycle.

Dependencies

To enable this parameter, disable the Bypass DA block parameter.

Samples to discard — Option to select the number of data samples to discard during accumulation process
`0` (default) | scalar in the range (0, 63)

Specify the number of data samples to discard during accumulation process.

Dependencies

To enable this parameter, disable the Bypass DA block parameter.

Adjust gain by right shift on DA result — Option to select number of bits for right shift operation on data accumulation filter result
`0` (default) | scalar in the range (0, 10)

Specify the number of bits for right shift operation on the DA result for gain adjustment.

Dependencies

To enable this parameter, disable the Bypass DA block parameter.

Disable filter chain restart — Option to disable the restarting of all the filter blocks prior to DA filter block
`off` (default) | `on`

Select to disable the restarting of all the filter blocks prior to DA filter block in the selected filter chain.

Dependencies

To enable this parameter, disable the Bypass DA block parameter.

Version History

Introduced in R2024a

CDSP

Description

Ports

Input

primary input — Input data from DSADC scalar

secondary input — Input data to use in Math filter scalar

Dependencies

Output

filtereddata — 16-bit filtered data vector

timestamp — Timestamp of 16-bit counter value scalar

Dependencies

Parameters

Filter Config

Enable timestamp output — Option to enable timestamp output off (default) | on

DSP Filter chain — Option to select filter chain Demo FIR (FC0) (default) | Advanced average 1 (FC1) | Basic data accumulation (FC2) | Advanced median (FC3) | Advanced average 2 (FC4) | Basic AURIX (FCM)

Output datatype — Data type of filtered output int16 (default) | uint16

Filter Config > FIFO Configuration

Enable FIFO — Option to enable first-in first-out (FIFO) register off (default) | on

Elements to retrieve from FIFO — Output samples to read from FIFO 1 (default) | 2

Dependencies

FIFO depth — FIFO register depth 4 (default) | 3 | 2 | 1 (only if 'Enable Timestamp' is not selected)

Dependencies

FIR

Bypass FIR block — Option to bypass FIR block in the filter chain off (default) | on

Dependencies

Decimation rate — Ratio of input data rate to output data rate in the FIR filter 1 (default) | 2 | 4 | 8 | 16

Dependencies

IIR6

Bypass IIR6 block — Option to bypass IIR6 filter block in the filter chain off (default) | on

Coefficients — Coefficients of IIR6 filter [16384, 0, 0, 16384, 0, 0, 16384, 0, 0, 16384, 0, 0, 16384, 0, 0, 16384, 0, 0] (default) | vector in the range (-32767 to 32768)

Dependencies

Decimation rate — Ratio of input data rate to output data rate in the IIR6 filter 1 (default) | 2 | 4 | 8 | 16

Dependencies

Bit extension — Number of bits to shift in the input and output data of the IIR6 filter block 0 (default) | scalar in the range (0, 7)

Dependencies

Math

Bypass math block — Option to bypass Math filter block in the filter chain off (default) | on

Math operation — Option to select the mathematical operation Addition with constant (default) | Addition with CDSP secondary input | Subtraction with constant | Subtraction with CDSP secondary input | Multiplication with constant

Dependencies

Constant value (-32768 to 32767) — Option to provide the constant value for the mathematical operation 0 (default) | scalar in the range (-32768 to 32767)

Dependencies

Bit shift after math operation (-32 to 32) — Number of bits for arithmetic right-shift on the Math filtered output 0 (default) | scalar in the range (-32 to 32)

Dependencies

Average

Bypass avegare block — Option to bypass AVG filter block in the filter chain off (default) | on

Number of samples — Option to select the number of samples for averaging operation 1 (default) | 2 | 4 | 8 | 16 | 32 | 64 | 128

Dependencies

Median

Bypass median block — Option to bypass MDN filter block in the filter chain off (default) | on

Number of samples — Option to select the number of samples median operation 1 (default) | 3 | 5 | 7 | 9

Dependencies

IIR1

Bypass IIR1 block — Option to bypass IIR1 filter block in the filter chain off (default) | on

Dependencies

Coefficients — Coefficients of IIR6 filter [16384, -12288, 16384, -16384] (default) | vector in the range (-32767 to 32768)

Dependencies

DA

Bypass DA block — Option to bypass DA filter block in the filter chain off (default) | on

Samples in accumulation cycle — Option to select the number of data samples per accumulation cycle 1 (default) | scalar in the range (1, 512)

Dependencies

Samples to discard — Option to select the number of data samples to discard during accumulation process 0 (default) | scalar in the range (0, 63)

Dependencies

Adjust gain by right shift on DA result — Option to select number of bits for right shift operation on data accumulation filter result 0 (default) | scalar in the range (0, 10)

Dependencies

Disable filter chain restart — Option to disable the restarting of all the filter blocks prior to DA filter block off (default) | on

Dependencies

Version History

See Also

primary input — Input data from DSADC
scalar

secondary input — Input data to use in Math filter
scalar

filtereddata — 16-bit filtered data
vector

timestamp — Timestamp of 16-bit counter value
`scalar`

Enable timestamp output — Option to enable timestamp output
`off` (default) | `on`

DSP Filter chain — Option to select filter chain
`Demo FIR (FC0)` (default) | `Advanced average 1 (FC1)` | `Basic data accumulation (FC2)` | `Advanced median (FC3)` | `Advanced average 2 (FC4)` | `Basic AURIX (FCM)`

Output datatype — Data type of filtered output
`int16` (default) | `uint16`

Enable FIFO — Option to enable first-in first-out (FIFO) register
`off` (default) | `on`

Elements to retrieve from FIFO — Output samples to read from FIFO
`1` (default) | `2`

FIFO depth — FIFO register depth
`4` (default) | `3` | `2` | `1` (only if 'Enable Timestamp' is not selected)

Bypass FIR block — Option to bypass FIR block in the filter chain
`off` (default) | `on`

Decimation rate — Ratio of input data rate to output data rate in the FIR filter
`1` (default) | `2` | `4` | `8` | `16`

Bypass IIR6 block — Option to bypass IIR6 filter block in the filter chain
`off` (default) | `on`

Coefficients — Coefficients of IIR6 filter
`[16384, 0, 0, 16384, 0, 0, 16384, 0, 0, 16384, 0, 0, 16384, 0, 0, 16384, 0, 0]` (default) | vector in the range (-32767 to 32768)

Decimation rate — Ratio of input data rate to output data rate in the IIR6 filter
`1` (default) | `2` | `4` | `8` | `16`

Bit extension — Number of bits to shift in the input and output data of the IIR6 filter block
`0` (default) | scalar in the range (0, 7)

Bypass math block — Option to bypass Math filter block in the filter chain
`off` (default) | `on`

Math operation — Option to select the mathematical operation
`Addition with constant` (default) | `Addition with CDSP secondary input` | `Subtraction with constant` | `Subtraction with CDSP secondary input` | `Multiplication with constant`

Constant value (-32768 to 32767) — Option to provide the constant value for the mathematical operation
`0` (default) | scalar in the range (-32768 to 32767)

Bit shift after math operation (-32 to 32) — Number of bits for arithmetic right-shift on the Math filtered output
`0` (default) | scalar in the range (-32 to 32)

Bypass avegare block — Option to bypass AVG filter block in the filter chain
`off` (default) | `on`

Number of samples — Option to select the number of samples for averaging operation
`1` (default) | `2` | `4` | `8` | `16` | `32` | `64` | `128`

Bypass median block — Option to bypass MDN filter block in the filter chain
`off` (default) | `on`

Number of samples — Option to select the number of samples median operation
`1` (default) | `3` | `5` | `7` | `9`

Bypass IIR1 block — Option to bypass IIR1 filter block in the filter chain
`off` (default) | `on`

Coefficients — Coefficients of IIR6 filter
`[16384, -12288, 16384, -16384]` (default) | vector in the range (-32767 to 32768)

Bypass DA block — Option to bypass DA filter block in the filter chain
`off` (default) | `on`

Samples in accumulation cycle — Option to select the number of data samples per accumulation cycle
`1` (default) | scalar in the range (1, 512)

Samples to discard — Option to select the number of data samples to discard during accumulation process
`0` (default) | scalar in the range (0, 63)

Adjust gain by right shift on DA result — Option to select number of bits for right shift operation on data accumulation filter result
`0` (default) | scalar in the range (0, 10)

Disable filter chain restart — Option to disable the restarting of all the filter blocks prior to DA filter block
`off` (default) | `on`