Firebee/FireBee_SVN
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

enable fast clock

Browse Source
This commit is contained in:
Markus Fröschle
2012-12-15 14:53:26 +00:00
parent 05af3297af
commit d8622ffeee
1 changed files with 20 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
SD_CARD/BaS_gcc/sources/mmc.c
View File

@@ -2,7 +2,8 @@
#include <bas_types.h>
#include <sd_card.h>
#include <bas_printf.h>
#include "sysinit.h"
#include <sysinit.h>
#include <MCF5475.h>
/*
* Firebee: MMCv3/SDv1/SDv2 (SPI mode) control module
@@ -51,21 +52,24 @@
#define PCLKSSPx PCLK_SSP1
#endif
#if PCLK_SSP * 1 == CCLK
#define PCLKDIV_SSP PCLKDIV_1
#elif PCLK_SSP * 2 == CCLK
#define PCLKDIV_SSP PCLKDIV_2
#elif PCLK_SSP * 4 == CCLK
#define PCLKDIV_SSP PCLKDIV_4
#elif PCLK_SSP * 8 == CCLK
#define PCLKDIV_SSP PCLKDIV_8
#else
#error Invalid clock frequency.
#endif
#define FCLK_FAST() { MCF_DSPI_DCTAR0 = MCF_DSPI_DCTAR_TRSZ(0b111) | /* transfer size = 8 bit */ \
MCF_DSPI_DCTAR_PCSSCK(0b01) | /* 3 clock DSPICS to DSPISCK delay prescaler */ \
MCF_DSPI_DCTAR_PASC_3CLK | /* 3 clock DSPISCK to DSPICS negation prescaler */ \
MCF_DSPI_DCTAR_PDT_3CLK | /* 3 clock delay between DSPICS assertions prescaler */ \
MCF_DSPI_DCTAR_PBR_3CLK | /* 3 clock prescaler */ \
MCF_DSPI_DCTAR_ASC(0b1001) | /* 1024 */ \
MCF_DSPI_DCTAR_DT(0b1001) | /* 1024 */ \
MCF_DSPI_DCTAR_BR(0b0000); }
#define FCLK_FAST() { SSPxCPSR = (PCLK_SSP / SCLK_FAST) & ~1; }
#define FCLK_SLOW() { SSPxCPSR = (PCLK_SSP / SCLK_SLOW) & ~1; }
#define FCLK_SLOW() { MCF_DSPI_DCTAR0 = MCF_DSPI_DCTAR_TRSZ(0b111) | /* transfer size = 8 bit */ \
MCF_DSPI_DCTAR_PCSSCK(0b01) | /* 3 clock DSPICS to DSPISCK delay prescaler */ \
MCF_DSPI_DCTAR_PASC_3CLK | /* 3 clock DSPISCK to DSPICS negation prescaler */ \
MCF_DSPI_DCTAR_PDT_3CLK | /* 3 clock delay between DSPICS assertions prescaler */ \
MCF_DSPI_DCTAR_PBR_3CLK | /* 3 clock prescaler */ \
MCF_DSPI_DCTAR_ASC(0b1001) | /* 1024 */ \
MCF_DSPI_DCTAR_DT(0b1001) | /* 1024 */ \
MCF_DSPI_DCTAR_BR(0b0111); }
@@ -75,7 +79,6 @@
---------------------------------------------------------------------------*/
#include "MCF5475.h"
#include "diskio.h"
@@ -218,7 +221,7 @@ static int select(void) /* 1:OK, 0:Timeout */
/*
* Control SPI module (Platform dependent)
*/
static void power_on (void) /* Enable SSP module and attach it to I/O pads */
static void power_on (void) /* Enable SSP module */
{
MCF_PAD_PAR_DSPI = 0x1fff; /* configure all DSPI GPIO pins for DSPI usage */
@@ -420,7 +423,7 @@ DSTATUS disk_initialize(uint8_t drv)
deselect();
if (ty) { /* OK */
// FCLK_FAST(); /* Set fast clock */
FCLK_FAST(); /* Set fast clock */
Stat &= ~STA_NOINIT; /* Clear STA_NOINIT flag */
} else { /* Failed */
power_off();