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demetrix80
Joined: 08 Jan 2010
Posts: 2
Location: Italy
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| SD card (raw mod) |
 Posted: Fri Jan 08, 2010 7:55 am |
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Hi to all,
I'm an Italian student. I'm working to a project for my electronic engineering thesis. I must store every data string that I get to a sd card. I use the sd card as a storage memory (raw), therefore I think that no is necessary to use Fat16 or 32 system (is correct?).
I make an example: I included the mmcsd.c driver and I used the mmcsd_write_byte for storage a character. After, I read this character with mmcsd_read_byte and I receive the data correctly. A this point I tryed to store a character string of 10 byte using the function mmcsd_write_data(a, n, p), but when I try to receive the data with mmcsd_read_data, I receive nothing.
Please you can help me?
Best regards
Demetrio |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Re: SD card (raw mod) |
| Posted: Fri Jan 08, 2010 9:13 am |
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| demetrix80 wrote: | | I must store every data string that I get to a sd card. I use the sd card as a storage memory (raw), therefore I think that no is necessary to use Fat16 or 32 system (is correct?). |
Yes, this is correct, you can do without a file system.
For the problems in storing and reading of the string data I don't know without further information. A possible problem could be the third parameter, check this to be a pointer.
If you don't know how to solve the problem it is best when you post a small program demonstrating your problem. Make the program small, max. 20 lines, and post the complete program including #fuses so we can copy/paste it directly in our compiler. |
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demetrix80
Joined: 08 Jan 2010
Posts: 2
Location: Italy
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| Posted: Fri Jan 08, 2010 12:46 pm |
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Hi ckielstra, thanks for reply.
The code for test the sd write/read is below:
| Code: |
#include "C:\Users\Demetrio\Documents\PIC-C\sd card\sd.h"
#include <float.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <mmcsd.c>
void main()
{
int32 address=0;
int16 b;
char *dato="Test";
char *rec;
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF|ADC_TAD_MUL_0);
setup_psp(PSP_DISABLED);
setup_spi(SPI_MASTER|SPI_L_TO_H|SPI_CLK_DIV_16);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
setup_oscillator(OSC_8MHZ|OSC_INTRC|OSC_31250|OSC_PLL_OFF);
mmcsd_init();
// TODO: USER CODE!!
while(true)
{
b=strlen(dato);
mmcsd_write_data(address, b, dato);
delay_ms(1000);
mmcsd_read_data(address, b, &car);
printf("%s\n\r", *car);
delay_ms(1000);
}
}
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The fuses is:
| Code: |
#include <18F4455.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES INTRC_IO //Internal RC Osc, no CLKOUT
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOBROWNOUT //No brownout reset
#FUSES BORV21 //Brownout reset at 2.1V
#FUSES NOPUT //No Power Up Timer
#FUSES NOCPD //No EE protection
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOWRT //Program memory not write protected
#FUSES NOWRTD //Data EEPROM not write protected
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES PBADEN //PORTB pins are configured as analog input channels on RESET
#FUSES NOWRTC //configuration not registers write protected
#FUSES NOWRTB //Boot block not write protected
#FUSES NOEBTR //Memory not protected from table reads
#FUSES NOEBTRB //Boot block not protected from table reads
#FUSES NOCPB //No Boot Block code protection
#FUSES LPT1OSC //Timer1 configured for low-power operation
#FUSES MCLR //Master Clear pin enabled
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES PLL12 //Divide By 12(48MHz oscillator input)
#FUSES CPUDIV4 //System Clock by 4
#FUSES USBDIV //USB clock source comes from PLL divide by 2
#FUSES VREGEN //USB voltage regulator enabled
#FUSES ICPRT //ICPRT enabled
#use delay(clock=8000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8) |
 I've resolved using a "for" cicle, reading every single character, with mmcsd_read_byte function, and copying into a string, but this not the best solution  . Ideally use the mmcsd_read_data.
Follow my solution:
| Code: |
for (i=0; i<=b; i++)
{
a=address+i;
mmcsd_read_byte(a, &rec);
car[i]=rec;
}
car[i+1]='\0';
printf("%s\n\r", car);
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Best regards
Demetrio |
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