Texas Instruments TM4C1294NCPDT User Manual

Table 9-11. Primary and Alternate Channel Control Structure Offsets for Channel 8
DescriptionOffset
Channel 8 Primary Source End PointerControl Table Base + 0x080
Channel 8 Primary Destination End PointerControl Table Base + 0x084
Channel 8 Primary Control WordControl Table Base + 0x088
Channel 8 Alternate Source End PointerControl Table Base + 0x280
Channel 8 Alternate Destination End PointerControl Table Base + 0x284
Channel 8 Alternate Control WordControl Table Base + 0x288
Configure the Source and Destination
The source and destination end pointers must be set to the last address for the transfer (inclusive).
Because the peripheral pointer does not change, it simply points to the peripheral's data register.
Both the primary and alternate sets of pointers must be configured.
1. Program the primary source end pointer at offset 0x080 to the address of the peripheral's receive
buffer.
2. Program the primary destination end pointer at offset 0x084 to the address of ping-pong buffer
A + 0x3F.
3. Program the alternate source end pointer at offset 0x280 to the address of the peripheral's
receive buffer.
4. Program the alternate destination end pointer at offset 0x284 to the address of ping-pong buffer
B + 0x3F.
The primary control word at offset 0x088 and the alternate control word at offset 0x288 are initially
programmed the same way.
1. Program the primary channel control word at offset 0x088 according to Table 9-12.
2. Program the alternate channel control word at offset 0x288 according to Table 9-12.
Table 9-12. Channel Control Word Configuration for Peripheral Ping-Pong Receive Example
DescriptionValueBitsField in DMACHCTL
8-bit destination address increment031:30DSTINC
8-bit destination data size029:28DSTSIZE
Source address does not increment327:26SRCINC
8-bit source data size025:24SRCSIZE
Reserved023:22reserved
Privileged access protection for
destination data writes
021DSTPROT0
Reserved020:19reserved
Privileged access protection for source
data reads
018SRCPROT0
Arbitrates after 8 transfers317:14ARBSIZE
Transfer 64 items6313:4XFERSIZE
N/A for this transfer type03NXTUSEBURST
Use Ping-Pong transfer mode32:0XFERMODE
699June 18, 2014
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TM4C1294NCPDT Microcontroller

Texas Instruments TM4C1294NCPDT Specifications

General

Brand	Texas Instruments
Model	TM4C1294NCPDT
Category	Microcontrollers
Language	English