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本编文章的目的主要用简明的方法对DDR3进行读写,当然这种方式每次读写都需要CPU干预,效率是比较低的,但是这是学习的过程吧。
本系列文章尽可能的让每一个实验都相对独立,过程尽可能保证完整性,保证实验的可重现性。 但是用到的模块或者IP的具体作用和用法不保证都重复详细的介绍。
本文所使用的开发板是兼容zedboard
PC 开发环境版本:Vivado 2015.4 Xilinx SDK 2015.4
建好后,在mem_demo_bsp->ps7->cortexa9_0的路径下,打开xparameters_ps.h这个头文件,这个头文件是cortexA9可以直接控制的外设地址的宏定义。在里面可以找到DDR的地址,可以看到如下代码:
/* Canonical definitions for DDR MEMORY */
#define XPAR_DDR_MEM_BASEADDR 0x00000000U
#define XPAR_DDR_MEM_HIGHADDR 0x3FFFFFFFU
等会我们要使用这个地址,对DDR3进行读写操作
在mem_demo_bsp->ps7->cortexa9_0的路径下,打开xil_io.h这个头文件,这个头文件是cortexA9可以直接控制的内存映射或者映射到了地址空间的IO。在里面可以看到如下代码:
//从某个地址读数据
u8 Xil_In8(INTPTR Addr);
u16 Xil_In16(INTPTR Addr);
u32 Xil_In32(INTPTR Addr);
//向某个地址写数据。
void Xil_Out8(INTPTR Addr, u8 Value);
void Xil_Out16(INTPTR Addr, u16 Value);
void Xil_Out32(INTPTR Addr, u32 Value);
OK,有了这些就可以简单的对DDR进行续写操作了
#include "stdio.h"
#include "platform.h"
#include "xparameters.h"
#include "xparameters_ps.h"
#include "xil_printf.h"
#include "xil_io.h"
#define DDR_BASEARDDR XPAR_DDR_MEM_BASEADDR + 0x10000000
int main()
{
init_platform();
int i;
int rev;
xil_printf("Hello World\n\r");
for(i=0; i<32; i++)
{
Xil_Out32(DDR_BASEARDDR+i*4,i);
}
for(i=0; i<32; i++)
{
rev = Xil_In32(DDR_BASEARDDR+i*4);
xil_printf("the address at %x data is : %x \n\r" ,DDR_BASEARDDR+i*4, rev);
}
cleanup_platform();
return 0;
}
串口终端的结果如下:
Hello World
the address at 10000000 data is : 0
the address at 10000004 data is : 1
the address at 10000008 data is : 2
the address at 1000000C data is : 3
the address at 10000010 data is : 4
the address at 10000014 data is : 5
the address at 10000018 data is : 6
the address at 1000001C data is : 7
the address at 10000020 data is : 8
the address at 10000024 data is : 9
the address at 10000028 data is : A
the address at 1000002C data is : B
the address at 10000030 data is : C
the address at 10000034 data is : D
the address at 10000038 data is : E
the address at 1000003C data is : F
the address at 10000040 data is : 10
the address at 10000044 data is : 11
the address at 10000048 data is : 12
the address at 1000004C data is : 13
the address at 10000050 data is : 14
the address at 10000054 data is : 15
the address at 10000058 data is : 16
the address at 1000005C data is : 17
the address at 10000060 data is : 18
the address at 10000064 data is : 19
the address at 10000068 data is : 1A
the address at 1000006C data is : 1B
the address at 10000070 data is : 1C
the address at 10000074 data is : 1D
the address at 10000078 data is : 1E
the address at 1000007C data is : 1F
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原文地址:http://www.cnblogs.com/geekite/p/5570796.html