SDFM single channel filter sync CPU read

Table of Contents

• Introduction
• External Connections
  • AM263X-CC
  • AM263X-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 CPU in SDFM ISR routine. The SDFM configuration is shown below:

• SDFM used in this example - SDFM0
• Input control mode selected - MODE0
• Comparator settings
  • Sinc3 filter selected
  • OSR = 32
  • HLT = 0x7FFF (Higher threshold setting)
  • LLT = 0x0000(Lower threshold setting)
• Data filter settings
  • Single filter module enabled
  • Sinc3 filter selected
  • OSR = 128
  • Single filter is synchronized by using MFE (Master Filter enable bit)
  • Filter output represented in 16 bit format
  • In order to convert 25 bit Data filter into 16 bit format user needs to right shift by 7 bits for Sinc3 filter with OSR = 128
• Interrupt module settings for SDFM filter
  • Single higher threshold comparator interrupt disabled
  • Single lower threshold comparator interrupt disabled
  • Single modulator failure interrupt disabled
  • Single filter will generate interrupt when a new filter data is available.

Watch Variables

• filterResult - Output of filter 2

External Connections

• Connect Sigma-Delta streams to SDFM0_CLK1, SDFM0_D1

AM263X-CC

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

• Connect Sigma-Delta streams to HSEC Pin 99, HSEC Pin 101

If required, use PWM waveforms as SDFM data and clock

• Connect HSEC Pin 51 to HSEC Pin 99
• Connect HSEC Pin 49 to HSEC Pin 101

AM263X-LP

• Connect Sigma-Delta streams to Boosterpack header J6/J8 Pin 74, J6/J8 Pin 73

If required, use PWM waveforms as data and clock

• Connect Boosterpack header J2/J4 Pin 11 to J6/J8 Pin 73
• Connect Boosterpack header J6/J8 Pin 59 to J6/J8 Pin 74

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Boards	am263x-cc, am263x-lp
Example folder	examples/drivers/sdfm/sdfm_filter_sync_cpuread_single_channel.c/

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,

[Cortex_R5_0] SDFM filter sync CPU read Test Started ...
All tests have passed!!