ZYNQ测试DDR读写速度的裸机程序
时间: 2023-09-13 13:02:48 浏览: 48
以下是一个简单的ZYNQ测试DDR读写速度的裸机程序示例:
```c
#include <stdio.h>
#include "xil_printf.h"
#include "xil_io.h"
#define DDR_BASEADDR 0x00000000
#define TEST_SIZE 0x1000000 // 16MB
int main()
{
int i;
unsigned int *ptr = (unsigned int *)DDR_BASEADDR;
unsigned int data;
// Fill the memory with a known pattern
for (i = 0; i < TEST_SIZE; i += 4) {
ptr[i/4] = i;
}
// Read and verify the memory
for (i = 0; i < TEST_SIZE; i += 4) {
data = ptr[i/4];
if (data != i) {
xil_printf("Error: read data 0x%x does not match expected data 0x%x\n", data, i);
return -1;
}
}
// Write and verify the memory
for (i = 0; i < TEST_SIZE; i += 4) {
ptr[i/4] = ~i;
}
for (i = 0; i < TEST_SIZE; i += 4) {
data = ptr[i/4];
if (data != ~i) {
xil_printf("Error: read data 0x%x does not match expected data 0x%x\n", data, ~i);
return -1;
}
}
xil_printf("Memory test passed\n");
return 0;
}
```
该程序首先使用一个已知模式填充DDR,然后读取并验证内存,接着使用相反的模式写入并验证内存。如果内存测试成功,则输出 "Memory test passed"。