9.1. DMA 传输数据

9.1.1. 概述

DMA示例工程展示了使用非链式和链式方式搬移数据的功能。这个工程会检查DMA搬移的数据是否正确。

9.1.2. 硬件设置

无特殊设置

9.1.3. 运行现象

以HPM6750EVK2 flash_xip build type为例，当工程正确运行后，串口终端会输出如下信息：

dma example start

unchained transfer

write testing
dma transferring data from 0x80000 to 0x1100000, burst size: 8192 bytes
rw throughput: 269284.71 KB/s
compare data between source address 0x80000 and destination address 0x1100000:  all data matches
dma transferring data from 0x80000 to 0x1100000, burst size: 4096 bytes
rw throughput: 497409.31 KB/s
compare data between source address 0x80000 and destination address 0x1100000:  all data matches
dma transferring data from 0x80000 to 0x1100000, burst size: 2048 bytes
rw throughput: 496765.84 KB/s
compare data between source address 0x80000 and destination address 0x1100000:  all data matches
dma transferring data from 0x80000 to 0x1100000, burst size: 1024 bytes
rw throughput: 495483.87 KB/s
compare data between source address 0x80000 and destination address 0x1100000:  all data matches
dma transferring data from 0x80000 to 0x1100000, burst size: 512 bytes
rw throughput: 491677.34 KB/s
compare data between source address 0x80000 and destination address 0x1100000:  all data matches
dma transferring data from 0x80000 to 0x1100000, burst size: 256 bytes
rw throughput: 484848.50 KB/s
compare data between source address 0x80000 and destination address 0x1100000:  all data matches
dma transferring data from 0x80000 to 0x1100000, burst size: 128 bytes
rw throughput: 471744.46 KB/s
compare data between source address 0x80000 and destination address 0x1100000:  all data matches
dma transferring data from 0x80000 to 0x1100000, burst size: 64 bytes
rw throughput: 361922.71 KB/s
compare data between source address 0x80000 and destination address 0x1100000:  all data matches
dma transferring data from 0x80000 to 0x1100000, burst size: 32 bytes
rw throughput: 247582.20 KB/s
compare data between source address 0x80000 and destination address 0x1100000:  all data matches
dma transferring data from 0x80000 to 0x1100000, burst size: 16 bytes
rw throughput: 151539.06 KB/s
compare data between source address 0x80000 and destination address 0x1100000:  all data matches
dma transferring data from 0x80000 to 0x1100000, burst size: 8 bytes
rw throughput: 85352.30 KB/s
compare data between source address 0x80000 and destination address 0x1100000:  all data matches

read testing
dma transferring data from 0x1100000 to 0x80000, burst size: 8192 bytes
rw throughput: 487928.84 KB/s
compare data between source address 0x1100000 and destination address 0x80000:  all data matches
dma transferring data from 0x1100000 to 0x80000, burst size: 4096 bytes
rw throughput: 487928.84 KB/s
compare data between source address 0x1100000 and destination address 0x80000:  all data matches
dma transferring data from 0x1100000 to 0x80000, burst size: 2048 bytes
rw throughput: 486692.00 KB/s
compare data between source address 0x1100000 and destination address 0x80000:  all data matches
dma transferring data from 0x1100000 to 0x80000, burst size: 1024 bytes
rw throughput: 485461.43 KB/s
compare data between source address 0x1100000 and destination address 0x80000:  all data matches
dma transferring data from 0x1100000 to 0x80000, burst size: 512 bytes
rw throughput: 481806.78 KB/s
compare data between source address 0x1100000 and destination address 0x80000:  all data matches
dma transferring data from 0x1100000 to 0x80000, burst size: 256 bytes
rw throughput: 474660.06 KB/s
compare data between source address 0x1100000 and destination address 0x80000:  all data matches
dma transferring data from 0x1100000 to 0x80000, burst size: 128 bytes
rw throughput: 460431.65 KB/s
compare data between source address 0x1100000 and destination address 0x80000:  all data matches
dma transferring data from 0x1100000 to 0x80000, burst size: 64 bytes
rw throughput: 359887.53 KB/s
compare data between source address 0x1100000 and destination address 0x80000:  all data matches
dma transferring data from 0x1100000 to 0x80000, burst size: 32 bytes
rw throughput: 238213.40 KB/s
compare data between source address 0x1100000 and destination address 0x80000:  all data matches
dma transferring data from 0x1100000 to 0x80000, burst size: 16 bytes
rw throughput: 144252.43 KB/s
compare data between source address 0x1100000 and destination address 0x80000:  all data matches
dma transferring data from 0x1100000 to 0x80000, burst size: 8 bytes
rw throughput: 80757.10 KB/s
compare data between source address 0x1100000 and destination address 0x80000:  all data matches

chained transfer
dma setup channel done
compare data between source address 0x1040000 and destination address 0x1100000:  all data matches
 [0]: data match
compare data between source address 0x1040000 and destination address 0x1104000:  all data matches
 [1]: data match
compare data between source address 0x1040000 and destination address 0x1108000:  all data matches
 [2]: data match

dma example end