83Plus:Software:usb8x/Asm Interface/MSD/UFI Read - Revision history

Brandonw: Forgot input (again)

2006-09-12T00:58:05Z

Forgot input (again)

Brandonw: Forgot input

2006-09-12T00:55:23Z

Forgot input

Brandonw at 07:10, 17 August 2006

2006-08-17T07:10:24Z

Brandonw at 06:54, 17 August 2006

2006-08-17T06:54:03Z

New page

== Synopsis ==
'''Name:''' UFI_Read

'''Minimum usb8x version:''' 0.10

Reads one sector from (MSDLBA) address and stores in sector buffer.

=== Inputs ===
* (MSDLBA) contains LBA address of sector to read

=== Outputs ===
* Sector buffer contains (MBDLBA) sector

=== Destroys ===
* AF, BC, DE, HL

== Notes ==
(MSDLBA) is a 4-byte area in the mass storage driver's internal memory buffer used by this routine. The following example code would set the value to zero, where appBackUpScreen is where the mass storage internal buffer is:
<code>
xor a
ld (appBackUpScreen+MSDLBA),a
ld (appBackUpScreen+MSDLBA+1),a
ld (appBackUpScreen+MSDLBA+2),a
ld (appBackUpScreen+MSDLBA+3),a
</code>
This is just to demonstrate where MSDLBA is in memory. See [[../MSD_Initialize|MSD_Initialize]] for more information about the internal buffer used by the mass storage driver.

== See Also ==
* [[../MSD_Initialize|MSD_Initialize]] - Initializes the mass storage driver

← Older revision		Revision as of 00:58, 12 September 2006
Line 11:		Line 11:

	=== Outputs ===		=== Outputs ===
−	* DE points to contents of (MBDLBA) sector
	* C set if problems		* C set if problems

@@ Line 7: / Line 7: @@
 === Inputs ===
 * (MSDLBA) contains LBA address of sector to read
 === Outputs ===
-* Sector buffer contains (MBDLBA) sector
+* DE points to contents of (MBDLBA) sector
 * C set if problems