Computer System Structures memory memory controller disk controller disk controller printer controller printer controller tape-drive controller tape-drive. The EDMA3 also allows for ” linking ” and “chaining” capabilities. This does NOT start a transfer – it only configures the channel for the next transfer. Loops, and sub-routines Interrupts Can be very useful in control applications particularly when the microprocessor must perform two tasks apparently. These are quite common in video applications when large buffers need to be moved from on-chip to off-chip memories. Mike Sumszyk Spring Semester Project.
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When one transfer completes, trigger another transfer to run Ex: Similar to linking, but rather than reloading the same channel, another channel is triggered to run.
Copy this sample application file in a location preferably not inside the kernel source code and build it as oevel kernel module using a make file similar to one shown below. Share buttons are a little bit lower. What is resource manager? For more advanced transfers, the EDMA offers indexing between transfers for both the source and destination addresses.
This hardware peripheral exists on most of the new Application Processors designed by Texas Instruments TI in the last few years. The QDMA uses a trigger word i.
BCNT specifies the number of “elements” in a “frame” or “line”. These are quite common in video applications when large buffers need to be moved from on-chip to off-chip memories.
BCNT or any 1.
Initialize the Resource Manager to get all the available resources. How does it work? Thanks for the replies. This array is an array of structures having the first structure member as the event queue number and the second structure member as the priority.
Processor SDK RTOS EDMA3 – Texas Instruments Wiki
Set the TCC field to match the next i. It seemed to me that using DMA to move the data from the ADCs to the DSP saves the processor cycles that would be used to do the reading and frees them up for processing. The terms linkingautoinitializationand reload are used to describe the same thing.
If you wish to download it, please recommend it to your kow in any social system. The QDMA can be used for just about anything the EDMA can be used for, in terms of transfers, but it can’t be triggered by an external event — it is software triggered. Page 1 Processes and Threads Chapter Processes 2. Binds channel to the param set.
This example includes synchronization, linking, and sorting. Initiate transfer a This step is highly dependent on the event trigger source: The EDMA3 is a powerful co-processor that can handle almost any type of transfer – either synchronous or asynchronous. How does chaining work?
OpenEmbedded Layer Index – edma3-lld-rtos
The first entry means 4 channels from channel ‘0’ i. However, with API libraries available, why do it the hard way? Share buttons are a little bit lower.
Mike Sumszyk Spring Semester Project.
[meta-ti] [PATCH] edma3-lld: add new recipe for edma3 low level driver
Interrupts These enable software to respond to signals from hardware. No such constraint is there for QDMA channels.
When looking at memory in the debugger memory window, there are checkboxes to allow you to look at cached and non-cached views of the memory.
I do remember that it was a very painful process!! After the EDMA transfers the first element, the src address will be indexed 4 bytes plus or minus prior to the next transfer.