asie's personal wiki

User Tools

Site Tools

Trace:
notes:flashcart:r4ds

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
notes:flashcart:r4ds [2023/10/16 14:43] – asienotes:flashcart:r4ds [2023/10/16 15:03] (current) – asie
Line 1: Line 1:
 ====== R4 (NDS) programming ====== ====== R4 (NDS) programming ======
  
-Original research provided mostly by lifehackerhansol.+Original research provided mostly [[https://github.com/DS-Homebrew/DLDI/wiki/Original-R4-and-M3-Simply|by lifehackerhansol]].
  
 ===== Control flags ===== ===== Control flags =====
Line 28: Line 28:
                              | |||         1 - Japanese                              | |||         1 - Japanese
                              | |||         2 - English                              | |||         2 - English
-                             | |||         3 - Simplified Chinese+                             | |||         3 - Chinese
                              | ||+------- Model:                              | ||+------- Model:
                              | ||          0 - M3DS Simply                              | ||          0 - M3DS Simply
                              | ||          1 - R4 Revolution for DS                              | ||          1 - R4 Revolution for DS
                              +-++-------- Sub-language:                              +-++-------- Sub-language:
-                                           1 - Traditional Chinese +                                           2:2  - French 
-                                           2 - French +                                           2:4  - Korean 
-                                           4 - Korean+                                           3:0? - Simplified Chinese 
 +                                           3:1? - Traditional Chinese
 </code> </code>
  
Line 71: Line 72:
 SD read data, but using the "ROM" FAT entry table. SD read data, but using the "ROM" FAT entry table.
  
-==== ? Get card ID ? (B8 00 00 00 00 00 00 00) ====+==== Get card ID (B8 00 00 00 00 00 00 00) ==== 
 + 
 +[[https://github.com/DS-Homebrew/DLDI/wiki/Original-R4-and-M3-Simply#original-r4--m3-ds-simply|Quoting lifehackerhansol]]: 
 + 
 +> Card ID commands are not patched and use the timings from the retail game ROM header, but without L1 latency (that's what the SDK does). Those can be as fast as a single cycle of L2 latency, depending on the game.
  
 ==== SD read request (B9 sd sc sb sa 00 00 00) ==== ==== SD read request (B9 sd sc sb sa 00 00 00) ====
Line 77: Line 82:
   * (MSB) sd sc sb sa (LSB) - sector address, in bytes   * (MSB) sd sc sb sa (LSB) - sector address, in bytes
  
-Returns zero when data is ready to access, non-zero if ongoing.+Returns ''0x00000000'' when data is ready to access, ''0x00000001'' if ongoing.
  
 ==== SD read data (BA 00 00 00 00 00 00 00) ==== ==== SD read data (BA 00 00 00 00 00 00 00) ====
Line 93: Line 98:
   * (MSB) sd sc sb sa (LSB) - sector address, in bytes   * (MSB) sd sc sb sa (LSB) - sector address, in bytes
  
-Returns zero if done, non-zero if ongoing.+Returns ''0x00000000'' when data is ready to access, ''0x00000001'' if ongoing.
  
 ==== Save write start (BD sd sc sb sa 00 00 00) ==== ==== Save write start (BD sd sc sb sa 00 00 00) ====
notes/flashcart/r4ds.1697467420.txt.gz · Last modified: 2023/10/16 14:43 by asie