CSIRX Internal Capture

Table of Contents

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

Introduction

In this example, we capture frames using the CSIRX interface in internal debug or test mode. In this mode, there is no external sensor attached. The CSIRX HW has a internal test mode which is used to construct and send a CSIRX frame to the CSIRX HW. The CSI HW captures the frame using its HW logic + DMA and outputs to the frame to memory buffer that is specified.

Here the CSIRX HW is setup using SysConfig. Two DMA contexts are created.

• Context 0, to switch DMA buffers when a complete frame is captured in the DMA buffer, also referred to as frame mode switching.
• Context 1, to switch DMA buffers when a 2 lines are captured in the DMA buffer, , also referred to as line mode switching.

Line mode switching is used when the frame is large and cannot be buffered in the limited internal memory of the SOC.

We show both the buffer switching examples in two different function calls in the example below.

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
	c66ss0 nortos
Toolchain	ti-arm-clang, ti-c6000
Board	am273x-evm
Example folder	examples/drivers/csirx/csirx_internal_loopback/

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

CSIRX

Sample Output

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

Frame switching mode capture ... starting
Frame switching mode capture ... done !!!
Line switching mode capture ... starting
Line switching mode capture ... done !!!
All tests have passed!!