nand&flash,nor&flash,spi&flash&各自特点
Flash有掉电数据保存的特点，RAM掉电则数据丢失，但是RAM的速度更高，擦写次数理论上没有限制，而Flash则不行。
Nand&Flash
相比其余的几种flash优势在于可擦写次数多，擦写速度快，但是在使用以及使用过程中会出现坏块因此需要做特殊
处理才可以使用。其主要用于数据存储，大部分U盘都是Nand&Flash。
读写时序类似于SRAM，只是写的次数较少，速度也慢，由于其读时序类似于SRAM，读地址是线性结构，多用于程序代码的
同Nand&Flash很类似，只是接口变成串行节省IO口，写速度慢些，主要用于不需要经常更改的数据存储。
片内&SRAM&以及片外没什么本质区别，区别主要在于速度性能上。
都可以用于存数据，除了SPI&Flash外其余的够可以存储程序并且运行程序。具体支持哪种需要核实cpu使用手册。
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flash 内存 Nor Flash SPI Flash Nand_Flash介绍
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flash 内存 Nor Flash SPI Flash Nand_Flash介绍
Flash编程之前，必须将对应的块擦除，而擦除的过程就是将所有位都写为1的过程，块内的所有字节变为0xFF
Flsah 分为两大类&Nor Flash和 Nand Flash
Nor Flash 又分为SPI Flash(串行 使用SPI通信)和 Nor Flash(并行 总线上传输)
SPI Flash :&每次传输一个bit位的数据，传输速度慢，但是价格便宜，?任意地址读数据，擦除按扇区进行
Nor Flash : 每次传输一个字节 ，速度快，任意地址读数据，擦除按扇区进行
Nand Flash：芯片操作是以“块”为基本单位.NAND闪存的块比较小，一般是8KB，然后每块又分成页，页大小一般是512字节.要修改NandFlash芯片中一个字节，必须重写整个数据块，读和写都是按照扇区进行的。
Nor Flash 应用地址举例
flash 低地址开始存放数据，占得内存大小按数据类型分配，一个地址一个字节(0xff)。地址自动向上增加
如存放一个uint16_t数据 占用2个字节。如果地址从0x存放数据，则低位占据0x高位占据0x。如果从0x开始取uint16_t数据，则会取出上个数据的高位和下个数据的低位
#defint FLASH_ADDR 0x
ipAddr =&(volatile uint16_t &*)FLASH_ADDR + 1; 与 ipAddr =&(volatile uint16_t &*)0x等效
WordProgram(1, 0x2665); &//分配了uint16_t的两个地址，低地址上写0x65，高地址写0x26
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