Changes between Initial Version and Version 1 of sdc_driver

Timestamp:

Oct 14, 2014, 5:26:25 PM (11 years ago)

Author:

alain

Comment:

--

sdc_driver

@@ +1 @@
+= GIET-VM / SDC Driver = 
+
+[[PageOutline]]
+
+The [source:soft/giet_vm/giet_drivers/sdc_driver.c sdc_driver.c] and [source:soft/giet_vm/giet_drivers/sdc_driver.h sdc_driver.h] files define the SDC driver. 
+
+This component is a single channel, block oriented, external mass storage peripheral, implemented on a SD card. 
+
+The ''sdc_driver'' uses the lower level ''spi_driver'' to access the SD card.
+
+Th ''sdc_driver'' is one of the physical disk driver that can be called by the generic IOC driver, and the SEG_IOC_BASE address must be defined in the hard_config.h file.
+
+In this implementation, the SDC peripheral is acting as a target (no DMA capability) :  the '''_sdc_read()''' and '''_sdc_write()''' are blocking until the transfer is fully completed, and does not use any interrupt to signal completion.
+
+WARNING : The '''_sdc_write()''' function is not implemented yet
+
+
+
+ === unsigned int '''_sdc_init'''() ===
+This function initializes the SPI controller and call sdc_open to initialize  the SD card.
+Returns 0 if success, >0 if failure
+
+ === unsigned int '''_sdc_read'''( unsigned int mode,   unsigned int lba,  paddr_t buffer,  unsigned int count ) ===
+Transfer data from the SD card to a memory buffer. 
+ * mode     : BOOT / KERNEL / USER (Not used in this implementation)
+ * lba      : first block index on the SD card
+ * buffer   : physical base address of the memory buffer 
+ * count    : number of blocks to be transfered.
+Returns 0 if success, > 0 if error.
+
+ === unsigned int '''_sdc_write'''( unsigned int mode,   unsigned int lba,  paddr_t buffer,  unsigned int count ) ===
+Transfer data from a memory buffer to the SD card. 
+ * mode     : BOOT / KERNEL / USER (Not used in this implementation)
+ * lba      : first block index on the SD card.
+ * buffer   : physical base address of the memory buffer 
+ * count    : number of blocks to be transfered.
+Returns 0 if success, > 0 if error.
+WARNING: The _sdc_write() is not implemented yet.
+
+ === unsigned int '''_sdc_get_status'''() ===
+ This function should not be called for this implementation of the SDC driver (No DMA).
+
+ === unsigned int '''_sdc_get_block_size'''() ===
+Returns the block size (bytes).
+
+
+
+