fix: spi dma

Squashed commit of the following:

commit f0df85e2d18ff36b04443ddb23e645cbbd5bfa58
Author: kuwoyuki <kuwoyuki@cock.li>
Date:   Wed Oct 16 01:36:26 2024 +0600

    fix: SPI DMA

    wait for SPI TXE and BSY flags, also fix korean lib

commit a16b9f769807a78803ba1d7cd10a4a4843827bb2
Author: kuwoyuki <kuwoyuki@cock.li>
Date:   Tue Oct 15 21:09:59 2024 +0600

    moar log

commit 0c457e17ffb956cb5fbbc40865e62f8acf8f2eea
Author: kuwoyuki <kuwoyuki@cock.li>
Date:   Tue Oct 15 14:09:31 2024 +0600

    _

commit a0b6820bc1312e429d04bf0bb39bc2a8b234cfc5
Author: kuwoyuki <kuwoyuki@cock.li>
Date:   Tue Oct 15 13:55:24 2024 +0600

    rewrite w/o interrupts

commit 83c2ab75b326be098bc15698d77ab650b14613e0
Author: kuwoyuki <kuwoyuki@cock.li>
Date:   Tue Oct 15 13:01:41 2024 +0600

    dma config

commit d871fef77d7c1838ac84f02a499f5555f78bc9ce
Author: kuwoyuki <kuwoyuki@cock.li>
Date:   Tue Oct 15 04:47:23 2024 +0600

    more dma

README.md

@@ -12,9 +12,16 @@ fw for a ch32v203 node w/ w5500 ethernet
   - SPI DMA only works with [prescalers](https://git.hye.su/mira/ch32-node/src/branch/master/src/spi_dma.c#L140) 8 and 64?
   - Also, for some reason it needs a ~50ms delay before configuring w5500 when compiled **with** `-O0`, not needed with `-Os`...
 
-Not an interrupt priority issue?:
-![LA](notes/2024-10-15-001533_1895x722_scrot.png)
+## Diff between SPI w/ and w/o DMA:
+### SPI DMA
+![SPI_DMA 1](notes/SPI_DMA_no_irq_1.png)
+![SPI_DMA 2](notes/SPI_DMA_no_irq_2.png)
+### SPI
+![SPI 1](notes/SPI_1.png)
+![SPI 2](notes/SPI_2.png)
 
+00 09 04 C0 A8 66 01 02
+00 09 04 C0 A8 66 01 02 02
 
 ## ~~previous (DNS Processing)~~
 solved by [patching](https://git.hye.su/mira/ch32-node/commit/259d63197e06c1a92b979490d4cd8f0fdb98f8d0#diff-6ba50689ba55dac7cfe3e9b011e594098c931e21) the korean bloatlib (`dns_makequery` in DNS.c)