Difference between revisions of "83Plus:Software:usb8x/Asm Interface/MSD/UFI Read"
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=== Outputs === | === Outputs === | ||
* Sector buffer contains (MBDLBA) sector | * Sector buffer contains (MBDLBA) sector | ||
| + | * C set if problems | ||
=== Destroys === | === Destroys === | ||
Revision as of 00:10, 17 August 2006
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
- C set if problems
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:
xor a ld (appBackUpScreen+MSDLBA),a ld (appBackUpScreen+MSDLBA+1),a ld (appBackUpScreen+MSDLBA+2),a ld (appBackUpScreen+MSDLBA+3),a
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
