SDFM Filter sync DMA read

Table of Contents

• Introduction
  • External Connections
  • Watch Variables
  • AM263X-CC or AM263PX-CC
  • AM263X-LP or AM263PX-LP
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

Introduction

A SDFM example that reads filter data from CPU In this example, SDFM filter data is read by DMA by SDFM FIFO DATA READTY INT trigger. SDFM configuration is shown below:

• SDFM used in this example - SDFM0
• Input control mode selected - MODE0
• Data filter settings
  • Filter 1 is enabled
  • Sinc3 filter selected
  • OSR = 256
  • Synchronized by using MFE (Main Filter enable bit)
  • Filter output represented in 16 bit format
  • In order to convert 26 bit Data filter into 16 bit format user needs to right shift by 10 bits for Sinc3 filter with OSR = 256
  • FIFO is enabled for 16 levels.
• Interrupt module settings for SDFM filter
  • Filter 1 will generate interrupt when a new filter FIFO Threshold is crossed.

Example Block diagram

External Connections

• Connect Sigma-Delta streams to SDFM0_CLK0, SDFM0_D0

Watch Variables

• filter1Result - Output of filter 1

AM263X-CC or AM263PX-CC

When using AM263x-CC with TMDSHSECDOCK (HSEC180 controlCARD Baseboard Docking Station)

• Connect Sigma-Delta streams to HSEC Pin 91, HSEC Pin 72

If required, use PWM waveforms as data and clock

• Connect HSEC Pin 51 to HSEC Pin 91
• Connect HSEC Pin 49 to HSEC Pin 72

AM263X-LP or AM263PX-LP

This example is not supported on AM263X-LP

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Board	am263x-cc
Example folder	examples/drivers/sdfm/sdfm_filter_sync_dmaread/

Steps to Run the Example

• When using CCS projects to build, import the CCS project for the required combination and build it using the CCS project menu (see Using SDK with CCS Projects).
• When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles)
• Establish connections as mentioned in External Connections section
• Launch a CCS debug session and run the executable, see CCS Launch, Load and Run
• View the UART console logs for results

See Also

SDFM

Sample Output

Shown below is a sample output when the application is run,

SDFM filter sync CPU read Test Started ...
gSdfmFifo1Base : 50268032
 
Some of the copied FIFO data...
Transfer number : 0 | Data : -2731 -13654 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -1638 
Transfer number : 12 | Data : -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16 
Transfer number : 24 | Data : -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16 
Transfer number : 36 | Data : -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16 
Transfer number : 48 | Data : -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16 
Transfer number : 60 | Data : -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16384 -16 
 
All tests have passed!!