UDMA ADC Read

Table of Contents

• Introduction
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

Introduction

This example performs PDMA RX data capture from ADC.

ADC is configured in single shot mode and captures APP_ADC_NUM_CH channel of ADC data. The FIFO is configured to generate a DMA trigger after all channel data is captured.

The application opens and configures a Packet DMA (PKTDMA) channel. It configures the PDMA parameter for transfer from ADC. The PDMA element count is set to the number of ADC samples - APP_ADC_NUM_CH.

This uses Host Packet Descriptor (HPD) to receive data from ADC PDMA channel into the destination buffer.

The ADC is configured to tag the channel/step ID as part of ADC data using ADCStepIdTagEnable API. The application uses this to compare that the DMA read data is in proper sequence and prints pass/fail accordingly.

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 freertos
Toolchain	ti-arm-clang
Board	am64x-evm
Example folder	examples/drivers/udma/udma_adc_read

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)
• Launch a CCS debug session and run the executable, see CCS Launch, Load and Run

See Also

UDMA

Sample Output

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

[UDMA] ADC read application started ...
CH 0 ADC Voltage: 1106 mV
CH 1 ADC Voltage: 1107 mV
CH 2 ADC Voltage: 738 mV
CH 3 ADC Voltage: 490 mV
CH 4 ADC Voltage: 322 mV
CH 5 ADC Voltage: 205 mV
CH 6 ADC Voltage: 120 mV
CH 7 ADC Voltage: 53 mV
Loop Count: 1 completed!!
 
CH 0 ADC Voltage: 1107 mV
CH 1 ADC Voltage: 1107 mV
CH 2 ADC Voltage: 738 mV
CH 3 ADC Voltage: 490 mV
CH 4 ADC Voltage: 322 mV
CH 5 ADC Voltage: 205 mV
CH 6 ADC Voltage: 120 mV
CH 7 ADC Voltage: 53 mV
Loop Count: 2 completed!!
 
CH 0 ADC Voltage: 1107 mV
CH 1 ADC Voltage: 1107 mV
CH 2 ADC Voltage: 738 mV
CH 3 ADC Voltage: 490 mV
CH 4 ADC Voltage: 322 mV
CH 5 ADC Voltage: 204 mV
CH 6 ADC Voltage: 120 mV
CH 7 ADC Voltage: 53 mV
Loop Count: 3 completed!!
 
CH 0 ADC Voltage: 1107 mV
CH 1 ADC Voltage: 1108 mV
CH 2 ADC Voltage: 738 mV
CH 3 ADC Voltage: 491 mV
CH 4 ADC Voltage: 322 mV
CH 5 ADC Voltage: 205 mV
CH 6 ADC Voltage: 120 mV
CH 7 ADC Voltage: 53 mV
Loop Count: 4 completed!!
 
CH 0 ADC Voltage: 1107 mV
CH 1 ADC Voltage: 1107 mV
CH 2 ADC Voltage: 738 mV
CH 3 ADC Voltage: 490 mV
CH 4 ADC Voltage: 322 mV
CH 5 ADC Voltage: 205 mV
CH 6 ADC Voltage: 120 mV
CH 7 ADC Voltage: 53 mV
Loop Count: 5 completed!!
 
CH 0 ADC Voltage: 1107 mV
CH 1 ADC Voltage: 1108 mV
CH 2 ADC Voltage: 738 mV
CH 3 ADC Voltage: 491 mV
CH 4 ADC Voltage: 322 mV
CH 5 ADC Voltage: 205 mV
CH 6 ADC Voltage: 120 mV
CH 7 ADC Voltage: 53 mV
Loop Count: 6 completed!!
 
CH 0 ADC Voltage: 1107 mV
CH 1 ADC Voltage: 1108 mV
CH 2 ADC Voltage: 738 mV
CH 3 ADC Voltage: 491 mV
CH 4 ADC Voltage: 322 mV
CH 5 ADC Voltage: 205 mV
CH 6 ADC Voltage: 120 mV
CH 7 ADC Voltage: 53 mV
Loop Count: 7 completed!!
 
CH 0 ADC Voltage: 1106 mV
CH 1 ADC Voltage: 1107 mV
CH 2 ADC Voltage: 738 mV
CH 3 ADC Voltage: 491 mV
CH 4 ADC Voltage: 322 mV
CH 5 ADC Voltage: 205 mV
CH 6 ADC Voltage: 120 mV
CH 7 ADC Voltage: 53 mV
Loop Count: 8 completed!!
 
CH 0 ADC Voltage: 1106 mV
CH 1 ADC Voltage: 1107 mV
CH 2 ADC Voltage: 738 mV
CH 3 ADC Voltage: 490 mV
CH 4 ADC Voltage: 322 mV
CH 5 ADC Voltage: 204 mV
CH 6 ADC Voltage: 120 mV
CH 7 ADC Voltage: 53 mV
Loop Count: 9 completed!!
 
CH 0 ADC Voltage: 1107 mV
CH 1 ADC Voltage: 1107 mV
CH 2 ADC Voltage: 738 mV
CH 3 ADC Voltage: 490 mV
CH 4 ADC Voltage: 322 mV
CH 5 ADC Voltage: 205 mV
CH 6 ADC Voltage: 120 mV
CH 7 ADC Voltage: 53 mV
Loop Count: 10 completed!!
 
All tests have passed!!