 |
 |
| View previous topic :: View next topic |
| Author |
Message |
MikeP
Joined: 07 Sep 2003
Posts: 49
|
| CCS MMC/SD code problems |
 Posted: Tue Sep 09, 2008 10:19 pm |
 |
|
Compiler: PCWH V4.078
Hardware: CCS 3.3volt Ethernet board.
I am having a hard time getting fat32 to work so I am trying to make sure the card I am trying to use is compatible with the CCS fat/MMCSD code. Here is a small program that calls 2 functions in mmcsd.c to print out data about the MMC/SD card.
| Code: |
#include <18F67J60.h>
#fuses NOWDT, HS, NOPROTECT
#use delay(clock=25M)
#use rs232(baud=9600, UART1)
//media library, a compatable media library is required for FAT.
#use fast_io(c)
#define MMCSD_PIN_SCL PIN_C3 //o
#define MMCSD_PIN_SDI PIN_C4 //i org PIN_C4
#define MMCSD_PIN_SDO PIN_C5 //o org PIN_C5
#define MMCSD_PIN_SELECT PIN_C2 //o org PIN_C2
#include <mmcsd.c>
//FAT library.
#include <fat.c>
void main(void)
{
printf("\r\n\n%s\r\n%s %s\r\nPCH V%s\r\n\n\n", "MMC/SD Test", __DATE__, __TIME__, __PCH__);
printf( "\r\nRC: %X\r\n", fat_init());
printf( "\r\nRC: %X\r\n", mmcsd_print_cid());
printf( "\r\nRC: %X\r\n", mmcsd_print_csd());
printf( "\r\nRC: %X\r\n", mmcsd_print_csd());
}
|
Here is the output.
| Code: |
MMC/SD Test
09-Sep-08 23:39:52
PCH V4.078
RC: 00
Manufacturer ID: 03
OEM/Application ID: SD
OEM/Application ID: SU01G
Product Revision: 80
Serial Number: 20686224
Manufacturer Date Code: 0065
CRC-7 Checksum: 63
RC: 00
RC: 82
CSD_STRUCTURE: 00
TAAC: 26
NSAC: 00
TRAN_SPEED: 32
CCC: 05F5
READ_BL_LEN: 09
READ_BL_PARTIAL: 01
WRITE_BLK_MISALIGN: 00
READ_BLK_MISALIGN: 00
DSR_IMP: 00
C_SIZE: 22
VDD_R_CURR_MIN: 05
VDD_R_CURR_MAX: 05
VDD_W_CURR_MIN: 06
VDD_W_CURR_MAX: 06
C_SIZE_MULT: 07
ERASE_BLK_EN: 01
SECTOR_SIZE: 1F
WP_GRP_SIZE: 7F
WP_GRP_ENABLE: 01
R2W_FACTOR: 04
WRITE_BL_LEN: 09
WRITE_BL_PARTIAL: 00
FILE_FORMAT_GRP: 00
COPY: 01
PERM_WRITE_PROTECT: 00
TMP_WRITE_PROTECT: 00
FILE_FORMAT: 00
CRC: A5
RC: 00
|
Notice the two calls to mmcsd_print_csd(). One returns 0X82 second call returns 0x00. Wondering why I have to call it two times. Hopfully knowing the 0x82 error code means will help me out there
Anyone know what error code 0x82 is? It is not listed in the enum MMCSD_err type it stops at 0x80.
| Code: |
enum MMCSD_err
{MMCSD_GOODEC = 0,
MMCSD_IDLE = 0x01,
MMCSD_ERASE_RESET = 0x02,
MMCSD_ILLEGAL_CMD = 0x04,
MMCSD_CRC_ERR = 0x08,
MMCSD_ERASE_SEQ_ERR = 0x10,
MMCSD_ADDR_ERR = 0x20,
MMCSD_PARAM_ERR = 0x40,
RESP_TIMEOUT = 0x80};
|
|
|
 |
FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
|
|
| Posted: Tue Sep 09, 2008 11:52 pm |
|
|
| I tryed to understand the 0x82 result code. To my opinion, its's a result from the underlying spi_xfer(), unfortunately undocumented in the present built-in function documentation, as far as I see. |
|
|
ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
|
|
| Posted: Wed Sep 10, 2008 6:13 pm |
|
|
I don't think 0x82 is an error code but caused by a wrong timing in the SPI bus readings. I have a long standing bug report with CCS, id nr. 8F1552: the SPI bus is now configured for mode 2. This is an invalid configuration for MMC cards as these only support SPI mode 0 or 3.
In mmcsd.c change the line | Code: | #use spi(MASTER, DI=MMCSD_PIN_SDI, DO=MMCSD_PIN_SDO, CLK=MMCSD_PIN_SCL, BITS=8, MSB_FIRST, IDLE=1, stream=mmcsd_spi)
|
to | Code: | | #use spi(MASTER, DI=MMCSD_PIN_SDI, DO=MMCSD_PIN_SDO, CLK=MMCSD_PIN_SCL, BITS=8, MSB_FIRST, IDLE=1, SAMPLE_RISE, stream=mmcsd_spi, FORCE_HW) |
|
|
|
MikeP
Joined: 07 Sep 2003
Posts: 49
|
|
| Posted: Thu Sep 11, 2008 12:47 pm |
|
|
I went and got 2 more SD cards to try out and I have one sorta working. Can dir it with the ex_fat.c code but the filenames are messed up a little.
I don't get the 0x82 return code from these SD cards. Both are 1g ones, no microsd to SD adapters.
ckielstra:
Thanks I will have to try that next tuesday when I get back home where my dev board is. |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
FAQ 
Search
Register
Profile 
Log in to check your private messages 
Log in
