ADC SOC software sync

Table of Contents

• Introduction
  • Example Description
  • SOC Configurations
  • Interrupt Configurations
  • ISR
• External Connections
  • AM263Px-CC E2 or AM263x-CC E2
  • AM263x-CC E1
  • AM263Px-LP or AM263x-LP
  • AM261x-LP
  • AM261x-SOM E1
• Watch Variables
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

Introduction

Example Description

This example shows synchronous operation on ADC1 and ADC2 trigger by a software forced by toggling a GPIO. The example uses a GPIO into the INPUTBAR[5] as trigger for the SOC in the given ADC and uses software to toggle to the loopback GPIO trigger the conversions.

Example Block diagram

SOC Configurations

• ADC 1
  • SOC 0,1 triggers are set to InputXbar[5]
  • SOC 0 samples Channel 0
  • SOC 1 samples Channel 1
• ADC 2
  • SOC 0,1 triggers are set to InputXbar[5]
  • SOC 0 samples Channel 0
  • SOC 1 samples Channel 1 (SOC 1 samples Channel 4 in case of AM261x-LP)

Interrupt Configurations

• ADC1INT1 source is set to EOC/SOC1
• INTXbar[0] is configured for ADC1INT1

ISR

• App_adcISR read the results stored by SOC0,1 in ADC1,2.

External Connections

AM263Px-CC E2 or AM263x-CC E2

• Connect loopback on GPIO 24, GPIO 23, i.e., HSEC PINS 87, 85
• Feed Analog voltage on
  • ADC 1 Channel 0 : HSEC PIN 12
  • ADC 1 Channel 1 : HSEC PIN 14
  • ADC 2 Channel 0 : HSEC PIN 25
  • ADC 2 Channel 1 : HSEC PIN 27

AM263x-CC E1

• Connect loopback on GPIO 24, GPIO 23, i.e., HSEC PINS 87, 85.
• Feed Analog voltage on
  • ADC 1 Channel 0 : HSEC PIN 18
  • ADC 1 Channel 1 : HSEC PIN 20
  • ADC 2 Channel 0 : HSEC PIN 24
  • ADC 2 Channel 1 : HSEC PIN 26

AM263Px-LP or AM263x-LP

• Connect loopback on GPIO 24, GPIO 23, i.e., J5/7 PINS 49,50.
• Feed Analog voltage on
  • ADC 1 Channel 0 : J1/3 PIN 24
  • ADC 1 Channel 1 : J1/3 PIN 29
  • ADC 2 Channel 0 : J1/3 PIN 25
  • ADC 2 Channel 1 : J5/7 PIN 63

AM261x-LP

• Connect loopback on GPIO 24, GPIO 23, i.e., J5/7 PINS 49,50.
• Feed Analog voltage on
  • ADC 1 Channel 0 : J1/3 PIN 24
  • ADC 1 Channel 1 : J5/7 PIN 42
  • ADC 2 Channel 0 : J1/3 PIN 25
  • ADC 2 Channel 4 : J1/3 PIN 28

AM261x-SOM E1

• Connect loopback on on GPIO 69 (configured as input) - HSEC connecter pin - 162 or connect it to GPIO 70 (Configured as output) - HSEC Connecter pin - 160
• feed analog input on
  • ADC 1 Channel 0 - HSEC PIN - 12
  • ADC 1 Channel 1 - HSEC PIN - 14
  • ADC 2 Channel 0 - HSEC PIN - 31
  • ADC 2 Channel 1 - HSEC PIN - 33

Watch Variables

• gAdc1Result0 : Digital representation of Voltages on ADC 1 Channel 0
• gAdc1Result1 : Digital representation of Voltages on ADC 1 Channel 1
• gAdc2Result0 : Digital representation of Voltages on ADC 2 Channel 0
• gAdc2Result1 : Digital representation of Voltages on ADC 2 Channel 1 (Channel 4 in case of AM261x-LP)

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Board	am263px-cc, am263px-lp
Example folder	examples/drivers/adc/adc_soc_software_sync/

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 ADC conversion results in UART console logs

See Also

ADC

Sample Output

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

ADC Synchronous Software Triggered Conversion Test Started ...
    ADC1        ADC2
    SOC0  SOC1  SOC0  SOC1
    450     619     450     619
    678     974     678     974
    702     986     702     986
    687     986     687     986
    698     989     698     989
    695     981     695     981
    687     981     687     981
    703     987     703     987
    706     983     706     983
    715     987     715     987
    728     993     728     993
ADC Synchronous Software Triggered Conversion Test Passed!!
All tests have passed!!