ESP8266 Flash
来自Jack's Lab
(版本间的差异)
(→Flash Memory Map) |
(→系统参数区 (System param)) |
||
第9行: | 第9行: | ||
始终为 Flash 的最后 16KB | 始终为 Flash 的最后 16KB | ||
− | * 8KB 为初始化射频参数 (esp_init_data_default.bin),4MB Flash 为:0x3FC000 - 0x3FDFFF | + | * 8KB 为初始化射频参数 (esp_init_data_default.bin),4MB Flash 为:0x3FC000 - 0x3FDFFF (The last sector 12 and 13) |
− | * 8KB 为初始化系统参数 (blank.bin),4MB Flash 为:0x3FE000 - 0x3FFFFF | + | * 8KB 为初始化系统参数 (blank.bin),4MB Flash 为:0x3FE000 - 0x3FFFFF (The last sector 14 and 15) |
皆由 SDK 提供 | 皆由 SDK 提供 |
2016年4月7日 (四) 16:59的版本
目录 |
1 概述
4KB 为一个扇区 (Sector)
1.1 系统参数区 (System param)
始终为 Flash 的最后 16KB
- 8KB 为初始化射频参数 (esp_init_data_default.bin),4MB Flash 为:0x3FC000 - 0x3FDFFF (The last sector 12 and 13)
- 8KB 为初始化系统参数 (blank.bin),4MB Flash 为:0x3FE000 - 0x3FFFFF (The last sector 14 and 15)
皆由 SDK 提供
1.2 用户参数区 (User param)
指 Espressif 提供的示例 (IOT_Demo / AT) 中设定的用户参数区
iBaihe 的参数: 0x3C * 4KB = 0x3C000
COS Platform 参数:
(0x3C + 1) * 4KB = 0x3D000 (SAVE_0) (0x3C + 2) * 4KB = 0x3E000 (SAVE_1) (0x3C + 3) * 4KB = 0x3F000 (PARAM_FLAG)
2 Layout Without OTA
Address Size Name Description 00000h 4k boot.bin Bootloader 3C000h 14k Param Start Sector 3D000h 1x4k Param Saved 0 3E000h 1x4k Param Saved 1 3F000h 1x4k Param Flag 40000h 240k app.v6.irom0text.bin SDK libraries 7C000h 8k esp_init_data_default.bin Default configuration 7E000h 8k blank.bin Filled with FFh. May be WiFi configuration
3 Layout With OTA
3.1 512 和 1024KB
3.2 4096KB
4 SPI Flash Format
5 SPI Flash Mode
- QIO , for flash that support quad r/w operation(e.g. W25Q)
- QOUT, for flash that support quad read operation(e.g. W25Q)
- DIO, for flash that support dual r/w operation(e.g. W25Q &W25X)
- DOUT, for flash that support dual read operation(e.g. W25Q &W25X)
经测试:
- Winbond 25Q32B 可工作于 DIO / DOUT / QIO /QOUT (Noduino Falcon)
- BergMicro 25Q32A 只可工作于 DIO / DOUT (NodeMCU V1.0 可能是 ESP-12E 接线的问题)
- MXIC 25L80 (小 K mini)只可工作于 DOUT
6 Flash Memory Map
- Map the flash
/* * Memory map first 8Mbit of flash * address space is: 0x4020 0000 - 0x402F FFFF */ Cache_Read_Enable (0, 0, 0);
- Unmap the flash
Cache_Read_Disable();
6.1 Cache_Read_Enable
void Cache_Read_Enable(uint8 odd_even, uint8 mb_count, unt8 no_idea);
Valid values for odd_even:
0 – clears bits 24 & 25 of control register 0x3FF0000C 1 – clears bit 24, sets bit 25
other – clears bit 25, sets bit 24
Function of odd_even:
0 – allows access to even numbered mb 1 – allow access to odd numbered mb
other – appears to do the same as 1, there must be a difference but I haven’t worked out what it it
Valid values for mb_count:
0-7 – set bits 16, 17 & 18 of control register 0x3FF0000C
Function of mb_count:
Which odd or even bank to map (according to odd_even option)
e.g. mb_count = 0, odd_even = 0 -> map first 8Mbit of flash e.g. mb_count = 0, odd_even = 1 -> map second 8Mbit of flash e.g. mb_count = 1, odd_even = 0 -> map third 8Mbit of flash e.g. mb_count = 1, odd_even = 1 -> map fourth 8Mbit of flash
Valid values for no_idea:
0 – sets bit 3 of 0x3FF00024 1 – sets bit 26 of 0x3FF0000C and sets bits 3 & 4 of 0x3FF00024
Function of no_idea:
The clue is in the name, I can’t work out what this does from my experiments, but the SDK always sets this to 1.
- Reverse engineered by Richard Burton: http://richard.burtons.org/2015/06/12/esp8266-cache_read_enable/
7 Reference