ADC SOC Oversampling

Table of Contents

• Example Description :
• SOC Configurations :
• INT Configurations
• ISR Configurations
• External Connections
  • AM263Px-CC or AM263X-CC E2
  • AM263X-CC E1
  • AM263PX-LP or AM263X-LP
• Watch Variables
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

Example Description :

This example shows oversamping on a given ADC channel, periodically triggered by EPWM. ADC1 Channel 2 is sampled by SOC (2-5) and are triggered by EPWMSOCA along with SOC 0 (sampling channel 0) and SOC 1 (sampling Channel 1).

SOC Configurations :

• SOC(0-5) are triggered by EPWMSOCA. Sample window is set at 16.
• SOC 0 samples on channel 0
• SOC 1 samples on channel 1
• SOC (2-5) sample on channel 2

INT Configurations

• ADC1INT1 is set for EOC/SOC5

ISR Configurations

• INTXbar0 is set for ADC1INT1.
• App_adcISR services this interrupt.
  • reads the results for the SOC(0-5),
  • freezes EPWM counter if required conversions are complete.

External Connections

AM263Px-CC or AM263X-CC E2

• Feed Analog Voltages on ADC 1 Channel 0 - HSEC PIN 12
• Feed Analog Voltages on ADC 1 Channel 1 - HSEC PIN 14
• Feed Analog Voltages on ADC 1 Channel 2 - HSEC PIN 18

AM263X-CC E1

• Feed Analog Voltages on ADC 1 Channel 0 - HSEC PIN 18
• Feed Analog Voltages on ADC 1 Channel 1 - HSEC PIN 20
• Feed Analog Voltages on ADC 1 Channel 2 - HSEC PIN 21

AM263PX-LP or AM263X-LP

• Feed Analog Voltages on ADC 1 Channel 0 - J1/3 PIN 24
• Feed Analog Voltages on ADC 1 Channel 1 - J1/3 PIN 29
• Feed Analog Voltages on ADC 1 Channel 2 - J5/7 PIN 67

Watch Variables

• gAdc1Channel0Result - array of digital represented voltages on ADC1 channel 0
• gAdc1Channel1Result - array of digital represented voltages on ADC1 channel 1
• gAdc1Channel2Result - array of digital represented voltages on ADC1 channel 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_soc_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 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 SOC Oversampling Test Started ...
ADC 1 Channel 0 Channel 1   Channel 2
    776     785     778
    777     787     780
    779     784     782
    781     787     782
    782     787     782
    783     787     784
    781     787     785
    783     789     786
    783     787     786
    783     785     784
    779     784     782
ADC SOC Oversampling Test Passed
All tests have passed!!