SDIO_Enumerate 1 (changes)
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SDIODriver
» SWI Calls
» SDIO_Enumerate
» SDIO_Enumerate 1
SDIO_Enumerate 1
(SWI &59002)
| Entry | |
|---|---|
| R0 | 1 (reason code: enumerate units) |
| R1 | 0 on first call, or preserved on subsequent calls |
| R2 | Bits 0 – 7 = slot number |
| Bits 8 – 15 = bus number | |
| Bits 16 – 31 ignored |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | 0 if no more units (R2 and R3 are not valid in this case), else the value to pass in R1 to next call |
| R2 | Bits 0 – 7 = slot number |
| Bits 8 – 15 = bus number | |
| Bits 16 – 31 = relative card address (RCA) | |
| R3 | Bits 0 – 7 = unit number |
| Bits 8 – 15 = function interface code (FIC) for IO, or 0 for memory(1 = UART, 2 = Bluetooth Type-A etc.) | |
| Bit 16 set => device is write-protected | |
| Bit 17 set => MMC (rather than SD/SDIO) device | |
| Bits 18 – 31 reserved, 0 | |
| R4 | Low word of card capacity (for memory cards) |
| R5 | High word of card capacity (for memory cards) |
Use
This SWI is used to enable the caller to discover the memory cards and IO functions available in a given slot.
Re-entrancy
This SWI is not re-entrant.
Notes
None.
See also
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