EDMA3 LLD DEVICE DRIVER

These are quite common in video applications when large buffers need to be moved from on-chip to off-chip memories. However, with API libraries available, why do it the hard way? In general, BCNT should not be 0. After the EDMA transfers the first element, the src address will be indexed 4 bytes plus or minus prior to the next transfer. For normal operation, valid values for BCNT are between 1 and 65 and a transfer with BCNT equal to 0 is considered either a null or dummy transfer. How does linking work? The event that is generated can be used to generate interrupt to a CPU or for chaining see below.

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In general, BCNT should not edmma3 0. Set the params for the transfers. Extra "Reload" parameter sets are available to hold another configuration that can be "reloaded" automatically into Channel X's registers upon completion of a transfer.

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EDMA3 Keystone SoC Devices

The APIs are relatively easy to use and most are self explanatory. Compatibility keys are composed of 3 comma-delimited numbers - M, S, R - where: From Texas Instruments Wiki. Similar to linking, but rather than reloading the same channel, another channel is triggered to run.

StarterWare includes Device Abstraction Layer DAL libraries, peripheral programming, and board level example applications that demonstrate the capabilities of the peripherals on the TI processors. Examples were simple examples that partitioned the LLD calls into separate functions alloc resources, configure transfers, start, delete.

Under the hood, the LLD is simply programming the peripheral register sets for you - however, this abstracts the user from needing to know the peripheral register addresses and cumbersome programming techniques. A trigger event is necessary to initiate a transfer. How do the source and destination addresses update?

This interrupt would be cleared when the character is read from RBR. Example 9 tries to abstract the configuration requirements so that the provided functions could be used and reused for a variety of purposes. For details, please refer Section After the first one completes, it edmaa3 the next channel to start.

Refer Table from the TRM below:.

Much time was spent working through each example and learning the LLD from the ground up. The devicr below was taken from the device tree.

The read rate setting can control the number of EDMA clock cycles between read command and the DBS setting specifies the maximum number of bytes per read command issued by the transfer controller.

EDMA3 Keystone SoC Devices - ppt download

This page was last modified on 12 Augustat EMIF controller doesn't support the edmaa3. These could be used for proper initialization of the software component s along with the OS adaptation layer for the same. This involves using indexing i. It cannot be synced to a peripheral event. If you are building, for example, a peripheral driver, which requires syncing transfers to a peripheral "data ready" signal, then the Low Level Driver Llc is the best choice.

Uses the DMA to transfer data in a simple audio application. This feature enables the transfer of complex patterns with llr intervention of CPU.

EDMA3 LLD 01.11.03 Release Notes

A simple asynchronous transfer; akin to a memcpy. How does chaining work? BCNT specifies the number of "elements" in a "frame" or "line".

Hence it can be used across multiple platforms. Each of these count values max out at 64K. Each channel is associated with a set of shadow registers.