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added optimized read and write routines

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This commit is contained in:
Markus Fröschle
2012-11-19 14:00:00 +00:00
parent 5ae1cf4cb1
commit 11b5d0c01b
2 changed files with 92 additions and 2 deletions
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2
include/sd_card.h
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@@ -27,6 +27,6 @@ const uint32_t DSPI_DMCR_CONF = MCF_DSPI_DMCR_MSTR | /* FireBee is DSPI master*/
extern int sd_card_init(void);
extern uint32_t sd_com(uint32_t data);
extern void sd_card_idle(void);
extern uint32_t sd_card_get_status(void);
#endif /* _SD_CARD_H_ */

92
sources/sd_card.c
View File

@@ -60,7 +60,29 @@ uint32_t sd_com(uint32_t data)
return ret;
}
void sd_card_init(void)
/*
* transfer a byte to SPI. This only works if the rest of the DSPI TX FIFO has been
* initialized previously (either by sd_com or a direct register write.
* Returns a byte received from SPI (contents of the RX FIFO).
*/
inline uint8_t sd_byte(uint8_t byte)
{
* (volatile uint8_t *) (&MCF_DSPI_DTFR + 3) = byte;
return * (volatile uint8_t *) (&MCF_DSPI_DRFR + 3);
}
/*
* as above, but word sized
*/
inline uint16_t sd_word(uint16_t word)
{
* (volatile uint16_t *) (&MCF_DSPI_DTFR + 2) = word;
return * (volatile uint16_t *) (&MCF_DSPI_DRFR + 2);
}
int sd_card_init(void)
{
uint32_t ret;
int i;
@@ -117,10 +139,78 @@ void sd_card_init(void)
wait(10000);
sd_card_idle();
xprintf("finished\r\n");
return 0;
}
void sd_card_idle(void)
{
int i;
int j;
uint32_t ret;
for (i = 0; i < 100; i++)
{
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x00FF);
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x0040);
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x0000);
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x0000);
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x0000);
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x0000);
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x0095);
for (j = 0; j < 6; j++)
{
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x00FF);
if (ret & 0x01)
{
break;
}
}
}
}
void sd_card_read_ic(void)
{
uint32_t ret;
while (/* no suitable data received */ 1)
{
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x00FF);
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x0048);
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x0000);
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x0000);
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x0001);
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x00aa);
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x0087);
ret = sd_card_get_status();
if ((ret & 0xff) == 5)
{
; /* sd v1 */
}
else
{
continue;
}
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x00ff);
/* move.b d5,d0 ? */
}
}
uint32_t sd_card_get_status(void)
{
uint32_t ret;
do
{
ret = sd_com(MCF_DSPI_DTFR_EOQ | MCF_DSPI_DTFR_CS5 | 0x00FF);
} while ((ret & 0xff) == 0xff);
return ret;
}