SAMD Flash Overview: Difference between revisions
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Applicable for SAMD21x18 with 256k FLASH | |||
'''EFU - External Flash Update''' | |||
{| class="wikitable" | {| class="wikitable" | ||
!style="text-align:center"|address | !style="text-align:center"|address | ||
| Line 4: | Line 7: | ||
!style="text-align:center"|Description | !style="text-align:center"|Description | ||
|- | |- | ||
|0x00000- | |0x00000-0x01FFF | ||
|0x2000 (8k) | |0x2000 (8k) | ||
|Arduino Bootloader | |Arduino Bootloader | ||
|- | |- | ||
|0x02000- | |0x02000-0x05FFF | ||
| | |0x3FFF (16k) | ||
|2nd stage update bootloader | |2nd stage update bootloader, last 256 bytes (0x05F00-0x05FFF) Bootloader EEPROM | ||
|- | |- | ||
|0x3E000- | |0x06000-0x3DFFF | ||
|0x38000 (224k) | |||
|Sketch | |||
|- | |||
|0x3E000-0x3FFFF | |||
|0x2000 (8k) | |||
|8k virtual "flash EEPROM" | |||
|} | |||
'''IFU - Internal Flash Update''' | |||
{| class="wikitable" | |||
!style="text-align:center"|address | |||
!style="text-align:center"|size | |||
!style="text-align:center"|Description | |||
|- | |||
|0x00000-0x01FFF | |||
|0x2000 (8k) | |||
|Arduino Bootloader | |||
|- | |||
|0x02000-0x05FFF | |||
|0x3FFF (16k) | |||
|2nd stage update bootloader, last 256 bytes (0x05F00-0x05FFF) Bootloader EEPROM | |||
|- | |||
|0x06000-0x21FFF | |||
|0x1C000 (112k) | |||
|Sketch | |||
|- | |||
|0x22000-0x3DFFF | |||
|0x1C000 (112k) | |||
|Update | |||
|- | |||
|0x3E000-0x3FFFF | |||
|0x2000 (8k) | |0x2000 (8k) | ||
|8k virtual "flash EEPROM" | |8k virtual "flash EEPROM" | ||
|} | |} | ||
Some additional information: | |||
*SAMD21G18A has 256 KByte FLASH | |||
*PAGE size is 64 Byte | |||
*One ROW has 4 pages. | |||
*Before one PAGE can be written, whole ROW that contains this PAGE must be erased. | |||
=> the minimum writeble amount of data is 256 bytes (1 ROW/4 PAGES). | |||
'''Example''': you will write some bytes to page 1. Pages 0,2 and 3 are on the same ROW. | |||
Pages 0,2 and 3 contains already some date. | |||
#So you have to read the data of this 3 pages to an array | |||
#add data of page 1 to this array | |||
#erase whole row (=pages 0,1,2,3) | |||
#and then write whole row(=pages 0,1,2,3) | |||
Latest revision as of 22:22, 20 March 2018
Applicable for SAMD21x18 with 256k FLASH
EFU - External Flash Update
| address | size | Description |
|---|---|---|
| 0x00000-0x01FFF | 0x2000 (8k) | Arduino Bootloader |
| 0x02000-0x05FFF | 0x3FFF (16k) | 2nd stage update bootloader, last 256 bytes (0x05F00-0x05FFF) Bootloader EEPROM |
| 0x06000-0x3DFFF | 0x38000 (224k) | Sketch |
| 0x3E000-0x3FFFF | 0x2000 (8k) | 8k virtual "flash EEPROM" |
IFU - Internal Flash Update
| address | size | Description |
|---|---|---|
| 0x00000-0x01FFF | 0x2000 (8k) | Arduino Bootloader |
| 0x02000-0x05FFF | 0x3FFF (16k) | 2nd stage update bootloader, last 256 bytes (0x05F00-0x05FFF) Bootloader EEPROM |
| 0x06000-0x21FFF | 0x1C000 (112k) | Sketch |
| 0x22000-0x3DFFF | 0x1C000 (112k) | Update |
| 0x3E000-0x3FFFF | 0x2000 (8k) | 8k virtual "flash EEPROM" |
Some additional information:
- SAMD21G18A has 256 KByte FLASH
- PAGE size is 64 Byte
- One ROW has 4 pages.
- Before one PAGE can be written, whole ROW that contains this PAGE must be erased.
=> the minimum writeble amount of data is 256 bytes (1 ROW/4 PAGES).
Example: you will write some bytes to page 1. Pages 0,2 and 3 are on the same ROW. Pages 0,2 and 3 contains already some date.
- So you have to read the data of this 3 pages to an array
- add data of page 1 to this array
- erase whole row (=pages 0,1,2,3)
- and then write whole row(=pages 0,1,2,3)