AM263x MCU+ SDK  08.02.01
ADC Burst Mode Oversampling

Table of Contents

Introduction

This example sets up ePWM0 to periodically trigger a set of conversions (SOC0,1,12,13,14,15) on ADC0 for conversion of inputs on ADC_AIN0, ADC_AIN1 and burst mode conversion on ADC_AIN3. This demonstrates a batch of conversion on ADC0 (inputs on ADC_AIN0 and ADC_AIN1) and burst mode conversion on ADC0 (input ADC_AIN3). ADC0 Interrupt ISR is used to read results of ADC0 (i.e. digital representations of inputs ADC_AIN0, ADC_AIN1 and average of oversampled ADC_AIN3)

Module Block diagram

The example does the below

  • Configures SOC0,1,2 of ADC0, as high priority SOCs, to be triggered by EPWM0.
  • Configures ADC interrupt 0 to be generated at end of conversion of SOC12.
  • ADC0 Interrupt ISR is used to read results of ADC0 from SOC0,SOC1 and average of SOC12 through SOC15.

Watch Variables

  • The watch variables gAdc0Result0, gAdc0Result1, gAdc0Result2 storing ADC conversion outputs can be used to view the results.

External Connections

  • ADC0_AIN0, ADC0_AIN1, ADC0_AIN3 pins should be connected to signals to be converted.

AM263X-CC

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

  • Feed analog inputs (non-zero voltage) to HSEC Pin 12, HSEC Pin 14, HSEC Pin 15

AM263X-LP

When using LP

  • Feed analog inputs (non-zero volatage) to Boosterpack header Pin 23,Pin 28 and Pin 2.

Supported Combinations

Parameter Value
CPU + OS r5fss0-0 nortos
Toolchain ti-arm-clang
Board am263x-cc, am263x-lp
Example folder examples/drivers/adc/adc_burst_mode_oversampling/

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
  • Using the watch variables, view the ADC conversion results.
  • View the ADC conversion results in UART console logs

See Also

ADC

Sample Output

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

ADC EPWM Triggered Burst Mode Conversions Test Started ...
ADC0 SOC0 : SOC1 : SOC2 : Result register value :
3379 : 2364 : 1524
1158 : 2314 : 1519
1158 : 2314 : 1522
1157 : 2314 : 1524
1158 : 2313 : 1520
1158 : 2313 : 1523
1158 : 2314 : 1522
1158 : 2313 : 1520
1157 : 2313 : 1527
1158 : 2314 : 1522
1158 : 2314 : 1518
ADC Burst Mode Oversampling Test Passed
All tests have passed!!