EDMA3 LLD DEVICE DRIVER

Retrieved from ” http: So it is easy to control the distribution of EDMA resources. The DMA is configured to respond to sync events from peripherals – i. The channel registers including DMA, QDMA, and interrupt registers are accessible via the global channel region address range, or in the shadow n channel region address ranges. Retrieved from ” http: The event that is generated can be used to generate interrupt to a CPU or for chaining see below. The first completion event is sent when a request is sent to the transfer controller.

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This hardware peripheral exists on most of the new Application Processors designed by Texas Instruments TI in the last few years.

EDMA3 Keystone SoC Devices

For more information, kindly refer section Porting instructions are provided for both the components to do the same. The best way to learn how to use the LLD is to download the pdf file shown below and work through the examples.

For questions regarding topics covered in this training, visit the support forums at the TI E2E Community website. You can also dvice the LLD for memory-to-memory transfers as shown in the examples below. For example, if you’d like to bump the src address 4 bytes after each element transfer, you can set ‘BIDX to 4.

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Processor SDK RTOS EDMA3 – Texas Instruments Wiki

Do you want to interrupt the CPU when the transfer is complete? For example, a common system using a serial port hooked to an ADC gathers a sample every sample period. For technical support please post your questions at http: McBSP tied to a codec.

Examples were simple examples that partitioned the LLD calls into separate functions alloc resources, configure transfers, start, delete.

The objective of the below tutorial to analyze LLD examples for basic transfers, interrupt generation, linking, channel sorting, chaining, etc. The EDMA3 also allows for “linking” and “chaining” capabilities.

This would probably identifies whether we have linking issue happens with second PaRAM set after first Tx. BCNT specifies the number of “elements” in a “frame” or “line”.

EDMA3 LLD 01.11.03 Release Notes

The data transfer starts when a timer interrupt occurs. Typically, these patches only include critical bug fixes. Chapter 2 Memory Addressing. Also, ‘CIDX devicr be employed to bump the src or dst addresses after a “frame” or “line” is transfered.

It consists of three 3 libraries:. Retrieved from ” http: EMIF controller doesn’t support the same. A trigger event is necessary to initiate a transfer. CCNT would have to be 3. Initialize the Resource Manager to get all the available resources.

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Programming the EDMA3 using the Low-Level Driver (LLD) – Texas Instruments Wiki

In addition to the shadow regions, there is a global region access to the Channel Controller. Source and destination devicee are fairly obvious. Figure of the EDMA3 Controller User Guide shows that a completion event can come from the transfer request process module and from one of the transfer controllers. How does chaining work? Almost all systems require some type of data movement – either from one memory location to another or from a peripheral register to memory or vice versa.

A basic transfer requires the source address, destination address and a devlce value how much to copy. That is, a new PaRam is loaded and the channel triggers itself. You want to sync each transfer of a bit word to the ll buffer being full or the transmit buffer being empty.

Develop corresponding service routines for these events.

Adds synchronization to our example. Compatibility keys are intentionally independent of Marketing product numbers and are intended to: