https://w.electrodragon.com/w/index.php?action=history&feed=atom&title=Category%3AFlash 2026-06-04T09:13:29Z Revision history for this page on the wiki MediaWiki 1.37.2 https://w.electrodragon.com/w/index.php?title=Category:Flash&diff=32519&oldid=prev 2022-02-07T08:48:53Z

<p><span dir="auto"><span class="autocomment">Documents</span></span></p> <p><b>New page</b></p><div>== Knowlege ==<br /> * 绝大多数的单片机和微控制器（ARM,x86)，地址空间都是以字节为单位的，也就是说一个地址是一个字节。<br /> * Flash存储器有个特点，就是只能写0，不能写1。所以如果原来的地址有数据了，意味着有一些位为0，这些位就相当于无效了。所以必须写之前确保他们都为1，只有擦除才可以。另外每次擦除都必须擦除一个4K大小的扇区，这是flash的特性所决定的。<br /> * 对Flash操作前必需打开内部振荡器。<br /> <br /> == STM32 Code ==<br /> Read, notice address should be 0x08006900 ... 0x08006910 ... 0x08006920<br /> uint8_t dat1 = *(__IO uint32_t *)(0x08006900);<br /> uint8_t dat2 = *(__IO uint32_t *)(0x08006910);<br /> uint8_t dat3 = *(__IO uint32_t *)(0x08006920);<br /> &lt;gallery&gt;<br /> File:Flash_address_map.png | address map of STM32F030<br /> &lt;/gallery&gt;<br /> <br /> <br /> == SPI Flash ==<br /> * SST - SST25VF016B-50-4C-S2AF<br /> * Winbond - W25Q64FVSSIG <br /> [[File:25Q128FVSG.png|thumbnail]]<br /> * Simple wiring <br /> D13, D12, D11, D10 of arduino to SPI flash - CLK, DO, DI and CS, <br /> 3V3 arduino to 3v3, wp, hold, and GND of arduino to GND<br /> * Data need to be erased before write again.<br /> * flash winbond W25Q SPI Flash <br /> [[File:W25Q SPI Flash.jpeg|400px]]<br /> * [https://github.com/Marzogh/SPIFlash Arduino SPIFlash library]<br /> == Programming ==<br /> === Programming by CH341 ===<br /> [[File:Spi flash prog.png|thumb|right]]<br /> * Use tool CH341 Programmer from github, download below<br /> * wiring please refer to page [[Flash#Pin_Wiring]], use CE0 for this board<br /> * Switch board power supply to 3V3, and MODE to others<br /> * press &quot;detect&quot; in tools and you should see like this.<br /> <br /> === (Obsolete) Update on-board SPI-Flash ===<br /> Here is an example of our MT7688AN board, flash uboot or firmware<br /> &lt;gallery&gt;<br /> File:Update_spi_flash.png | 01 wire up<br /> File:Update_spi_flash_02.png | 02 connect to programmer<br /> File:Update_spi_flash_03.png | Click program to upload<br /> &lt;/gallery&gt;<br /> * No need to connect anymore, use programmer power supply<br /> * Connect pin VDD, MOSI, CLK, MISO, CS, GND<br /> * Detect on board SPI Flash size 16Mb, which is W25Q128FVSSIG<br /> * Upload you file, uboot or firmware<br /> <br /> <br /> <br /> [[category: Memory]]</div>

Chao