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mrYalamen
Joined: 13 Aug 2011
Posts: 9
Location: Viet Nam
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| Need help about interface with MMC card 18F4620 |
 Posted: Fri Aug 26, 2011 12:07 am |
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 Hello all!
I'm a beginner of CCS. I had used "mmc_spi.c" from CCS library and used the function mmc_init() but it always respond "1"= failed! Can somebody give me the reason and solve this problem for me? Thank all. <Sorry about my English>
Here is my simple code
| Code: |
#include "18F4620.h"
#fuses HS,NOWDT,NOPROTECT,NODEBUG
#use delay(clock=4000000)
//#include "input.c"
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
//#include "input.c"
#include "mmc_spi.c"
#include <stdio.h>
void main()
{
BYTE value,cmd;
int32 address;
int1 check;
// int8 i;
printf("\r\nCheck MMC Card\n\r");
check=mmc_init();
if(check==1)
{
printf("Check Card Failed\n\r");
}
if(check==0)
{
printf("Check Card Sucessful\n\r");
}
} |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Fri Aug 26, 2011 3:47 am |
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Many things can be wrong, but here is at least one error to fix: | Code: | int1 check;
...
check=mmc_init(); |
If you look in the file mmc_spi.c you will see the mmc_init function returns an enum of the type MMC_EC. This will not fit into an int1 !
Change your code to something like: | Code: | #include "18F4620.h"
#fuses HS,NOWDT,NOPROTECT,NODEBUG
#use delay(clock=4000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8, ERRORS)
#include "mmc_spi.c"
void main()
{
MMC_EC check;
printf("\r\nCheck MMC Card\n\r");
check = mmc_init();
if (check == MMC_EC_OK)
{
printf("Check Card Sucessful\n\r");
}
else
{
printf("Check Card Failed\n\r");
}
for(;;);
} |
Note that I also added the ERRORS directive to the '#use rs232' line, this will reset some errors in the hardware UART when necessary. |
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mrYalamen
Joined: 13 Aug 2011
Posts: 9
Location: Viet Nam
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| Posted: Fri Aug 26, 2011 9:21 am |
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| Thanks a lot for your helpful! Just because I'm too negligent. I only see the function that does not care about the return values and void main's details. I'll try it more! |
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