Texas Instruments Development Kit for TM4C129x,Tiva™ ARM® Cortex™ -M4 Microcontroller DK-TM4C129X DK-TM4C129X 데이터 시트

제품 코드

DK-TM4C129X

Figure 9-5. Peripheral Scatter-Gather, Setup and Configuration

4 WORDS (SRC A)

16 WORDS (SRC B)

1 WORD (SRC C)

SRC

DST

ITEMS=12

SRC

DST

ITEMS=n

Task List in Memory

Source Buffer

in Memory

Channel Control

Table in Memory

Channel Primary
Control Structure

Channel Alternate
Control Structure

DEST

Peripheral Data

Register

SRC

DST

ITEMS=16

Unused

SRC

DST

ITEMS=1

DST

“TASK” A

“TASK” B

“TASK” C

Unused

ITEMS=4

SRC

Unused

NOTES:
1. Application has a need to copy data items from three separate locations in memory into a peripheral data

2. Application sets up µDMA “task list” in memory, which contains the pointers and control configuration for three

µDMA copy “tasks.”

3. Application sets up the channel primary control structure to copy each task configuration, one at a time, to the

alternate control structure, where it is executed by the µDMA controller.

December 13, 2013

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Texas Instruments-Advance Information

Micro Direct Memory Access (μDMA)