PYNQ裸跑之读写SD卡

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我是靠谱客的博主英俊紫菜，最近开发中收集的这篇文章主要介绍PYNQ裸跑之读写SD卡，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

去年搞了一年的算法，今年终于得空继续学学PYNQ，参考了网上的例子，发现发现SD卡读写是如此简单。

第一步：在zynq中接口设置中选中SD卡，在pynq的默认配置中已经选中SD卡，所以这里不需要任何操作。

第二步：在SDK中添加xilffs库

第三步：添加函数文件sd.c

/******************************************************************************
*
* Copyright (C) 2009 - 2014 Xilinx, Inc.  All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* Use of the Software is limited solely to applications:
* (a) running on a Xilinx device, or
* (b) that interact with a Xilinx device through a bus or interconnect.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* XILINX  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Except as contained in this notice, the name of the Xilinx shall not be used
* in advertising or otherwise to promote the sale, use or other dealings in
* this Software without prior written authorization from Xilinx.
*
******************************************************************************/

/*
 * helloworld.c: simple test application
 *
 * This application configures UART 16550 to baud rate 9600.
 * PS7 UART (Zynq) is not initialized by this application, since
 * bootrom/bsp configures it to baud rate 115200
 *
 * ------------------------------------------------
 * | UART TYPE   BAUD RATE                        |
 * ------------------------------------------------
 *   uartns550   9600
 *   uartlite    Configurable only in HW design
 *   ps7_uart    115200 (configured by bootrom/bsp)
 */

#include "sd.h"

int SD_Init()
{
    FRESULT rc;
    rc = f_mount(&fatfs,"",0);
    if(rc)
    {
        xil_printf("ERROR: f_mount returned %drn",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 %drn",rc);
        return XST_FAILURE;
    }
    rc = f_lseek(&fil,0);
    if(rc)
    {
        xil_printf("ERROR:f_open returned %drn",rc);
        return XST_FAILURE;
    }
    rc = f_read(&fil,(void*)DestinationAddress,ByteLength,&br);
    if(rc)
    {
        xil_printf("ERROR:f_open returned %drn",rc);
        return XST_FAILURE;
    }
    rc = f_close(&fil);
    if(rc)
    {
        xil_printf("ERROR:f_open returned %drn",rc);
        return XST_FAILURE;
    }
    return XST_SUCCESS;
}

int SD_Transfer_write(char *FileName,u32 SourceAddress,u32 ByteLength)
{
    FIL fil;
    FRESULT rc;
    UINT bw;

    rc = f_open(&fil,FileName,FA_CREATE_ALWAYS | FA_WRITE);
    if(rc)
    {
        xil_printf("ERROR : f_open returned %drn",rc);
        return XST_FAILURE;
    }
    rc = f_lseek(&fil, 0);
    if(rc)
    {
        xil_printf("ERROR : f_lseek returned %drn",rc);
        return XST_FAILURE;
    }
    rc = f_write(&fil,(void*) SourceAddress,ByteLength,&bw);
    if(rc)
    {
        xil_printf("ERROR : f_write returned %drn", rc);
        return XST_FAILURE;
    }
    rc = f_close(&fil);
    if(rc){
        xil_printf("ERROR : f_close returned %drn",rc);
        return XST_FAILURE;
    }
    return XST_SUCCESS;
}

头文件：

/******************************************************************************
*
* Copyright (C) 2009 - 2014 Xilinx, Inc.  All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* Use of the Software is limited solely to applications:
* (a) running on a Xilinx device, or
* (b) that interact with a Xilinx device through a bus or interconnect.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* XILINX  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Except as contained in this notice, the name of the Xilinx shall not be used
* in advertising or otherwise to promote the sale, use or other dealings in
* this Software without prior written authorization from Xilinx.
*
******************************************************************************/

/*
 * helloworld.c: simple test application
 *
 * This application configures UART 16550 to baud rate 9600.
 * PS7 UART (Zynq) is not initialized by this application, since
 * bootrom/bsp configures it to baud rate 115200
 *
 * ------------------------------------------------
 * | UART TYPE   BAUD RATE                        |
 * ------------------------------------------------
 *   uartns550   9600
 *   uartlite    Configurable only in HW design
 *   ps7_uart    115200 (configured by bootrom/bsp)
 */

#include "platform.h"
#include "xparameters.h"
#include "xil_printf.h"
#include "ff.h"
#include "xdevcfg.h"
static FATFS fatfs;

int SD_Init();

int SD_Transfer_read(char *FileName,u32 DestinationAddress,u32 ByteLength);

int SD_Transfer_write(char *FileName,u32 SourceAddress,u32 ByteLength);

第四步：调用测试

main函数如下所示：

#define FILE "test.txt"

int main()
{
    init_platform();
    int rc;

    const char src_str[] = "hsp test sd card write and read!";
    u32 len = strlen(src_str);

    rc = SD_Init();
    if(XST_SUCCESS != rc)
    {
        xil_printf("fail to open SD Card~nr");
    }
    else
    {
        xil_printf("success to open SD Card~nr");
    }

    rc = SD_Transfer_write(FILE,(u32)src_str,(len/256+1)*256);
    xil_printf("%d",(len/256+1)*256);
    if(XST_SUCCESS != rc)
    {
        xil_printf("fail to write SD Card~nr");
    }
    else
    {
        xil_printf("success to write SD Card~nr");
    }
    char dest_str[33];
    rc = SD_Transfer_read(FILE,(u32)dest_str,(len+1));
    if(XST_SUCCESS != rc)
    {
        xil_printf("fail to read SD Card~nr");
    }
    else
    {
        xil_printf("success to read SD Card~nr");
    }
    xil_printf("%srn",dest_str);
    printf("SD Card Write and Read Success~");
    cleanup_platform();
    return 0;
  }

调用注意事项为：有时候重新编译报错，需要重新添加xilffs库。