zynq对sd卡读浮点数操作

最近一直在做zynq方面的学习，用到哪就写到哪吧
读写sd步骤如下
1、首先新建zynq的工程，连线如下
2、然后综合，布线生成后bin文件，并按照下图操作

打开sdk后新建工程
file 》new 》application project
新建helloworld工程
下面导入sd卡的库
点击xilinx 》board support package setting
选中xilffs库，其他默认即可

连接上板载的串口

#include "platform.h"
#include "xparameters.h"
#include "xil_printf.h"
#include "ff.h"
#include "xdevcfg.h"


static FATFS fatfs;


int SD_Init()
{
FRESULT rc;
rc = f_mount(&fatfs,"",0);
if(rc)
{
xil_printf("ERROR : f_mount returned %d\r\n",rc);
return XST_FAILURE;
}
return XST_SUCCESS;
}


int SD_Transfer_read(char *FileName,u32 DestinationAddress,u32 ByteLength)
{
FIL fil;
FRESULT rc;
UINT br;


rc = f_open(&fil,FileName,FA_READ);
if(rc)
{
xil_printf("ERROR : f_open returned %d\r\n",rc);
return XST_FAILURE;
}
rc = f_lseek(&fil, 0);
if(rc)
{
xil_printf("ERROR : f_lseek returned %d\r\n",rc);
return XST_FAILURE;
}
rc = f_read(&fil, (void*)DestinationAddress,ByteLength,&br);
if(rc)
{
xil_printf("ERROR : f_read returned %d\r\n",rc);
return XST_FAILURE;
}
rc = f_close(&fil);
if(rc)
{
xil_printf(" ERROR : f_close returned %d\r\n", rc);
return XST_FAILURE;
}
return XST_SUCCESS;
}

float power(float a,int b){
	float c=1;
	if(b>0){

		for(int i=0;i47)&&(dst_str[a]<58)){
    			myfloat[i]=dst_str[a]-48;
        		i++;
			}
		}
		else
		{nummode[nummode_num]=dst_str[a]-48;
		nummode_num++;

		}
	}


	else if(dst_str[a+1]!=32){//next num
		mode=0;
		for(int k=0;k