【分享】如何使用 SFUD 库来操作 SPI Flash 设备

发布于 2017-09-07 08:52:32 浏览：17110 订阅该版

[SFUD](https://github.com/armink/SFUD)是一款使用 JEDEC SFDP 标准的串行 (SPI) Flash 通用驱动库]

目前 RT-Thread 2.1.0 之后已经支持。这使得 RTT 可以驱动 更多型号的 SPI Flash 。同时使用该驱动支持多 Flash 对象实例， 能够让用户 **同时驱动多片 SPI Flash** 。主要使用方法如下：

1. 配置
在 rtconfig.h 可增加如下配置信息，每个配置的功能详见 [rt-thread/components/drivers/spi/sfud/inc/sfud_cfg.h](https://github.com/armink/rt-thread/blob/master/components/drivers/spi/sfud/inc/sfud_cfg.h)
```c
#define RT_USING_SFUD                      //必选
#define RT_DEBUG_SFUD               1   //可选
#define RT_SFUD_USING_SFDP           //可选
#define RT_SFUD_USING_FLASH_INFO_TABLE     //可选
```

2. 使用
以往的方式只需输入 SPI Flash 的设备名称及对应的 SPI 设备名称即可
```c
w25qxx_init("flash", "spi10");

dfs_mount("flash", "/", "elm", 0, 0);
```
现在使用方法也类似，只不过初始化成功后会返回 SPI flash 对象，这是一个动态 SPI flash 对象，支持对该 SPI flash 设备的删除。
```c
static rt_spi_flash_device_t w25q64, sst25vf016b;
/* 创建两个 SPI Flash 设备，分别从 spi10 及 spi30 两个 spi 设备探测 */
w25q64 = rt_sfud_flash_probe("flash0", "spi10");
sst25vf016b = rt_sfud_flash_probe("flash1", "spi30");

dfs_mount("flash0", "/", "elm", 0, 0);

rt_sfud_flash_delete(sst25vf016b);
```

3、sf (SPI Flash 操作) 测试命令
在 spi_flash_sfud.c 定义有 SPI Flash 操作命令，可以通过 MSH 命令来手动操作 SPI Flash ，简单使用方法如下：
```
msh >sf
Usage:
sf probe [spi_device]           - probe and init SPI flash by given 'spi_device'
sf read addr size               - read 'size' bytes starting at 'addr'
sf write addr data1 ... dataN   - write some bytes 'data' to flash starting at 'addr'
sf erase addr size              - erase 'size' bytes starting at 'addr'
sf status [<volatile> <status>] - read or write '1:volatile|0:non-volatile' 'status'
sf bench                        - full chip benchmark. DANGER: It will erase full chip!

msh >sf probe spi10
8 MB W25Q64 is current selected device.

msh >sf read 0 64
Read the W25Q64 flash data success. Start from 0x00000000, size is 64. The data is:
Offset (h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
[00000000] 54 00 00 00 90 8F E3 A7 69 61 70 5F 6E 65 65 64 
[00000010] 5F 63 6F 70 79 5F 61 70 70 3D 30 00 69 61 70 5F 
[00000020] 63 6F 70 79 5F 61 70 70 5F 73 69 7A 65 3D 30 00 
[00000030] 73 74 6F 70 5F 69 6E 5F 62 6F 6F 74 6C 6F 61 64

msh >sf write 10 1 2 3 4 5
Write the W25Q64 flash data success. Start from 0x0000000A, size is 5.
Write data: 1 2 3 4 5 .

msh >sf erase 0 8192
Erase the W25Q64 flash data success. Start from 0x00000000, size is 8192

msh >sf status
The W25Q64 flash status register current value is 0x00.

msh >sf status 1 28
Write the W25Q64 flash status register to 0x1C success.

msh >sf bench yes
Erasing the W25Q64 8388608 bytes data, waiting...
Erase benchmark success, total time: 20.591S.
Writing the W25Q64 8388608 bytes data, waiting...
Write benchmark success, total time: 32.768S.
Reading the W25Q64 8388608 bytes data, waiting...
Read benchmark success, total time: 16.129S.
```

41 个回答

bernard 2017-09-07

这家伙很懒，什么也没写！

armink 2017-09-07

这家伙很懒，什么也没写！

bernard 2017-09-07

这家伙很懒，什么也没写！

armink 2017-09-07

这家伙很懒，什么也没写！

勇士FF 2018-07-02

这家伙很懒，什么也没写！

我使用的是3.0.4 build Jun 24 2018

`bsp/stm32f429-apollo`
编译下载 ，出现如下问题：
```
[SFUD]Warning: Read SFDP parameter header information failed. The W25Q256 is not support JEDEC SFDP.
[SFUD]Warning: This flash device is not found or not support.
[SFUD]Error: W25Q256 flash device is initialize fail.
ERROR: SPI flash probe failed by SPI device spi50.
```
我检查了好久没有找到答案，我猜想rtt官网再app中使用并且driver都已测试，我直接下载就可以使用，想测试下效果出现如上错误，

probe：
```c
if (RT_NULL == rt_sfud_flash_probe("W25Q256", "spi50"))
    {
        return RT_ERROR;
    };
```
挂：
```c
result = rt_spi_bus_attach_device(&spi_device, "spi50", "spi5", (void*)&spi_cs);
```
```
msh />list_device
device         type         ref count
------ -------------------- ----------
e0     Network Interface    0       
spi50  SPI Device           0       
spi5   SPI Bus              0       
i2c0   I2C Bus              1       
nand0  MTD Device           0       
rtc    RTC                  0       
uart2  Character Device     0       
uart1  Character Device     2

sf probe spi50
[SFUD]Warning: Read SFDP parameter header information failed. The sf_cmd is not support JEDEC SFDP.
[SFUD]Warning: This flash device is not found or not support.
[SFUD]Error: sf_cmd flash device is initialize fail.
ERROR: SPI flash probe failed by SPI device spi50.
msh />
msh />
```
烦请知道的人员赐教下  谢谢