hi all,
Good day. I did interfacing SD card with Atmega32 via SPI. i gone through with these links http://elm-chan.org/fsw/ff/00index_e.htmlIn this i could not create or open a existing file. And my code is
http://elm-chan.org/fsw/ff/en/open.html
/*****************************************************
This program was produced by the
CodeWizardAVR V2.05.3 Standard
Automatic Program Generator
© Copyright 1998-2011 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com
Project :
Version :
Date : 11/3/2014
Author : Dev6
Company : sass
Comments:
Chip type : ATmega32L
Program type : Application
AVR Core Clock frequency: 8.000000 MHz
Memory model : Small
External RAM size : 0
Data Stack size : 512
*****************************************************/
#include <mega32.h>
#include <stdio.h>
#include <stdlib.h>
#include <spi.h>
#include <sdcard.h>
#include <ff.h>
#include <delay.h>
void main(void)
{
unsigned char wr_buf[7] = "sriram";
unsigned int i=0;
FRESULT res;
FATFS fs;
FIL fp;
unsigned char buffer[10];
unsigned int br, bw; // File read/write count
// Input/Output Ports initialization
// Port A initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTA=0x00;
DDRA=0x00;
// Port B initialization
// Func7=Out Func6=In Func5=Out Func4=Out Func3=In Func2=In Func1=In Func0=In
// State7=0 State6=T State5=0 State4=0 State3=T State2=T State1=T State0=T
PORTB=0x00;
DDRB=0xB0;
// Port C initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTC=0x00;
DDRC=0x00;
// Port D initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTD=0x00;
DDRD=0x00;
// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 9600
UCSRA=0x00;
UCSRB=0x18;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x33;
// SPI initialization
// SPI Type: Master
// SPI Clock Rate: 2000.000 kHz
// SPI Clock Phase: Cycle Start
// SPI Clock Polarity: Low
// SPI Data Order: MSB First
SPCR=0x50;
SPSR=0x00;
puts("\nstart_sd_card");
res = f_mount(0, &fs);
if (res == FR_OK)
{
printf("\nres_mount: %d", res);
}
if (res == FR_OK)
{
puts("\nin create_new");
res = f_open(&fp,"0:sd0.txt",FA_CREATE_NEW); //create a new file
}
else puts("\nfail create_new");
f_close(&fp);
if (res == FR_OK)
{
puts("\nin write");
res = f_open(&fp,"0:sd0.txt",FA_WRITE);
//res = f_write(&fp,buffer,sizeof buffer,&br);
res = f_write(&fp,wr_buf,sizeof(wr_buf),&bw);
}
else puts("\nfail write");
f_close(&fp);
if (res == FR_OK)
{
puts("\nin read");
res = f_open(&fp,"0:sd.txt",FA_READ);
if(res) printf("res: %d",res);
//delay_ms(2000);
//res = f_read(&fp,buffer,br,&bw);
res = f_read(&fp,buffer,10,&bw);
if(res) printf("res_read: %d",res);
printf("\nbuffer:%s",buffer);
}
else puts("\nfail read");
f_close(&fp);
puts("\nend");
while (1)
{
// Place your code here
}
}
and my result is
start_sd_card
res_mount: 0
in create_new
i am using this product.