一、准备工作
二、编译代码
三、测试

4.DMA内存访问测试

该教程演示如何通过开发板实现DMA内存访问

一、准备工作

准备1块BearPi-Pico H2821开发板

二、编译代码

在Windows下编译操作

点击左侧的“KConfig”,打开配置界面.

选择Support DMA Sample.

Application  --->
    [*] Enable Sample.
    [*]     Enable the Sample of peripheral.
    [ ]         Enable all the sample of peripheral, it's just for build.
    [ ]         Support ADC Sample.
    [ ]         Support BLINKY Sample.
    [ ]         Support BUTTON Sample.
    [*]         Support DMA Sample.
                    DMA Sample Configuration  --->

按下"Save"键保存配置。
编译烧录固件
参考环境搭建教程编译烧录代码

在Ubuntu下编译操作

在MobaXterm中输入:
```
./build.py menuconfig
```

选择Support DMA Sample.

Application  --->
    [*] Enable Sample.
    [*]     Enable the Sample of peripheral.
    [ ]         Enable all the sample of peripheral, it's just for build.
    [ ]         Support ADC Sample.
    [ ]         Support BLINKY Sample.
    [ ]         Support BUTTON Sample.
    [*]         Support DMA Sample.
                    DMA Sample Configuration  --->

按下"ESC"键退出并保存配置。
编译烧录固件
参考环境搭建教程编译烧录代码

三、测试

烧录固件后按下开发的复位按键，观察开发板的运行日志。

dma single memory transfer start!
dma single memory transfer succ!
dma checking transfer from 0x00048e88 to 0x00048e08...
dma memory copy test succ, length = 32 block
dma single memory transfer start!
dma single memory transfer succ!
dma checking transfer from 0x00048e88 to 0x00048e08...
dma memory copy test succ, length = 32 block
dma single memory transfer start!
dma single memory transfer succ!
dma checking transfer from 0x00048e88 to 0x00048e08...
dma memory copy test succ, length = 32 block
dma single memory transfer start!
dma single memory transfer succ!
dma checking transfer from 0x00048e88 to 0x00048e08...
dma memory copy test succ, length = 32 block
dma single memory transfer start!
dma single memory transfer succ!
dma checking transfer from 0x00048e88 to 0x00048e08...
dma memory copy test succ, length = 32 block