kopia lustrzana https://github.com/peterhinch/micropython-samples
Add note on Flash to Pyboard D section.
rodzic
ac459af6ce
commit
dd72be0eeb
|
@ -134,7 +134,9 @@ comments in [the test script](./soft_wdt/swdt_tests.py).
|
|||
|
||||
## 4.4 Reverse
|
||||
|
||||
Fast [reverse](./reverse/reverse.py) a bytearray in Arm Thumb assembler.
|
||||
Fast [reverse](./reverse/reverse.py) a bytearray in Arm Thumb assembler: this
|
||||
reverses the byte order of the array so `[1,2,3,4]` becomes `[4,3,2,1]`.
|
||||
|
||||
Also includes cross-platform Python code to bit-reverse (fast-ish) 8, 16 and 32
|
||||
bit words.
|
||||
|
||||
|
|
|
@ -52,11 +52,26 @@ wl.config(antenna=value) # 0 internal 1 external
|
|||
wl.config(txpower=value) # In dbm
|
||||
```
|
||||
|
||||
## Variants
|
||||
## Flash memory
|
||||
|
||||
I am aware of two variants distinguished by the sticker on top of the CPU.
|
||||
1. SF2W (blue). This has about 178K of free RAM and 2MB of Flash.
|
||||
2. SF6W (red). This has 432K of free RAM. Also has 2MB Flash.
|
||||
The SF2W and SF3W have 512KiB of internal flash, the SF6W has 2048KiB. All
|
||||
have two external 2048KiB flash chips, one for the filesystem and the other for
|
||||
executable code (it can be memory mapped). On SF2W and SF3W, if you freeze a
|
||||
lot of code the firmware can become too big for the internal flash. To put
|
||||
frozen code in external flash, edit the file
|
||||
`ports/stm32/boards/PYBD_SF2/f722_qspi.ld` (or the corresponding one for
|
||||
`PYBD_SF3` to add the line `*frozen_content.o(.text* .rodata*)`:
|
||||
```
|
||||
.text_ext :
|
||||
{
|
||||
. = ALIGN(4);
|
||||
*frozen_content.o(.text* .rodata*)
|
||||
*lib/btstack/*(.text* .rodata*)
|
||||
*lib/mbedtls/*(.text* .rodata*)
|
||||
. = ALIGN(512);
|
||||
*(.big_const*)
|
||||
|
||||
```
|
||||
|
||||
## Bootloader
|
||||
|
||||
|
|
Ładowanie…
Reference in New Issue