1.W801内部flash资料

1.1 W801内部flashUse partition

W801的内部flash大小是2M 字节,物理地址是0x08000000-0x081FFFFF.
在CDK的例程中,flashEach internal address segment has a specific purpose,看看这种《内部flash分区表》：

Which is reserved for the user to use the scope“User Area”【0x081C0000 ~ (0x081FC000-1)】.

1.2 内部flasherase-write characteristics

1. 擦除的最小单位是扇区,每个扇区4k 字节;The contents of the same sector will be erased at the same time,So when changing part of the content of the same sector,Other content must be temporarily saved later,rewrite together.

这一点,库函数 int tls_fls_write(u32 addr, u8 *buf, u32 len) 已经帮我们做好,We can directly write less than4k字节的内容,Don't care whether to erase other contents of the same sector.

2.利用SDK的demo快速测试flash相关函数

2.1 打开宏 DEMO_FLASH

在文件wm_demo.h中打开DEMO_FLASH

#define DEMO_ON 1
#define DEMO_OFF 0

//demo console
#define DEMO_CONSOLE DEMO_ON
.........
//flash demo
#define DEMO_FLASH (DEMO_ON && DEMO_CONSOLE)

2.2 Serial command testflash

编译下载后,Serial command addedt-flash,如下图：

在串口输入“t-flash"You can enter the test.

3.保存用户参数

我在实际应用中,一共用了 8个字节的用户数据 + 33字节的wifi SSID + 65字节的wifi密码,共106字节.So the selected address range is 【0x081FB000 ~ 0x081FBFFF】,The size is one sector,4k 字节.

extern	u8 airkiss_pwd[65];
#define wifiCfgByte airkiss_pwd[64] // 使用密码数组最后一个字节作为配网标记
extern	u8 airkiss_ssid[33];
#define PARAM_FLASH_ADDR_BASE 0x1fb000 // 0x08200000 - 0x1000 最后4k,一个扇区
#define PARAM_FLASH_DATA_LEN 8
///============ 开启配网需要相应的保存函数 
#if TLS_CONFIG_AIRKISS_MODE_ONESHOT
	#define PARAM_FLASH_ADDR_WIFI_ID_LEN 33
	#define PARAM_FLASH_ADDR_WIFI_PWD_LEN 65
	
	#define PARAM_FLASH_ADDR_WIFI_ID_OFFSET (PARAM_FLASH_DATA_LEN)
	#define PARAM_FLASH_ADDR_WIFI_PWD_OFFSET (PARAM_FLASH_ADDR_WIFI_ID_OFFSET+PARAM_FLASH_ADDR_WIFI_ID_LEN)
	#define PARAM_FLASH_ADDR_WIFI_CFG_OFFSET (PARAM_FLASH_ADDR_WIFI_PWD_OFFSET+PARAM_FLASH_ADDR_WIFI_PWD_LEN-1)

	///==========传入参数为 wifi_info_storage_t ================
	void	WriteWifiParam(unsigned char configByte)
	{
    
		unsigned char write_buf[PARAM_FLASH_ADDR_WIFI_ID_LEN+PARAM_FLASH_ADDR_WIFI_PWD_LEN];
		wifiCfgByte = configByte;
		memcpy(write_buf,airkiss_ssid,sizeof(airkiss_ssid));
		memcpy(write_buf+PARAM_FLASH_ADDR_WIFI_ID_LEN,airkiss_pwd,sizeof(airkiss_pwd));
		tls_fls_write(PARAM_FLASH_ADDR_BASE+PARAM_FLASH_ADDR_WIFI_ID_OFFSET, write_buf, sizeof(write_buf));	
	}
	// 
	unsigned char ReadWifiParam(void)
	{
    
		tls_fls_read(PARAM_FLASH_ADDR_BASE+PARAM_FLASH_ADDR_WIFI_ID_OFFSET, airkiss_ssid, sizeof(airkiss_ssid));
		tls_fls_read(PARAM_FLASH_ADDR_BASE+PARAM_FLASH_ADDR_WIFI_PWD_OFFSET, airkiss_pwd, sizeof(airkiss_pwd));
		return wifiCfgByte;
	}
#endif // TLS_CONFIG_AIRKISS_MODE_ONESHOT

上面的代码中,airkiss_ssid和airkiss_pwd是全局变量,See the source screenshot below：

This article is written here,The practical operation of one-key distribution network is described below,题目《联盛德W801系列2-WIFI一键配网,信息保存》.