#include <Avr/io.h>
#include "mmc.h"
#include "uart.h"
#include "rprintf.h"
#include "debug.h"
#include<stdio.h>
char FAT_SECTOR_BUFFER_ADDR[512];
int main()
{
int i =0;
uartInit(); // initialize UART (serial port)
uartInitBuffers();
uartSetBaudRate(9600); // set UART speed to 9600 baud
rprintfInit(uartSendByte); // configure rprintf to use UART for output
rprintf("Hello World\r\n");
delay_ms(100);
char buff[512];
#define MMC_DEBUG
mmcTest();
// mmcInit();
// mmcReset();
// mmcRead(0,buff);
// for(i =1;i<=32;i++)
// {
// buff[i]=i+64;
// }
// memset(buff,'A',512);
// mmcWrite(0,buff);
// rprintfStr(buff);
}
void delay_ms(unsigned short ms) {
unsigned short outer1, outer2;
outer1 = 200;
while (outer1) {
outer2 = 1000;
while (outer2) {
while ( ms ) ms--;
outer2--;
}
outer1--;
}
}
void mmcTest(void)
{
u32 sector=1;
u08 buffer[0x200];
u08 buffRead[0x200];
int c;
int i =0;
for(i =1;i<=512;i++)
{
buffer[i]=65;
}
// initialize MMC interface
mmcInit();
mmcReset();
// print new prompt
rprintf("\r\nNhap vao ma : I-Init r-Read w-Write >");
// testing loop
while(1)
{
// check for keypress
if((c=uartGetByte()) != -1)
{
rprintf("%c",c);
switch(c)
{
case 'i':
// initialize card
rprintf("\r\nResetting MMC/SD Card\r\n");
mmcReset();
break;
case 'r':
// read current sector into buffer
rprintf("\r\nRead Sector %d\r\n", sector);
mmcRead(sector, buffRead);
delay_ms(3000);
for(i =1;i<=512;i++)
{
rprintf("%c",buffRead[i]);
}
// print buffer contents
//debugPrintHexTable(0x200, buffer);
break;
case 'w':
// write current sector with data from buffer
rprintf("\r\nWrite Sector %d\r\n", sector);
mmcWrite(sector, buffer);
delay_ms(3000);
break;
// move to new sector
case '+': sector++; rprintf("\r\nSector = %d", sector); break;
case '-': sector--; rprintf("\r\nSector = %d", sector); break;
case '*': sector+=512; rprintf("\r\nSector = %d", sector); break;
case '/': sector-=512; rprintf("\r\nSector = %d", sector); break;
case '\r':
default:
break;
}
// print new prompt
rprintf("\r\nNhap vao ma : I-Init r-Read w-Write >");
}
}
}
/*! \file mmc.c \brief MultiMedia and SD Flash Card Interface. */
//*****************************************************************************
//
// File Name : 'mmc.c'
// Title : MultiMedia and SD Flash Card Interface
// Author : Pascal Stang - Copyright (C) 2004
// Created : 2004.09.22
// Revised : 2006.06.12
// Version : 0.1
// Target MCU : Atmel AVR Series
// Editor Tabs : 4
//
// NOTE: This code is currently below version 1.0, and therefore is considered
// to be lacking in some functionality or documentation, or may not be fully
// tested. Nonetheless, you can expect most functions to work.
//
// This code is distributed under the GNU Public License
// which can be found at http://www.gnu.org/licenses/gpl.txt
//
//*****************************************************************************
//----- Include Files ---------------------------------------------------------
#include <avr/io.h> // include I/O definitions (port names, pin names, etc)
#include <avr/interrupt.h> // include interrupt support
#include "global.h" // include our global settings
#include "spi.h" // include spi bus support
#include "rprintf.h"
#include "mmc.h"
// include project-specific hardware configuration
#include "mmcconf.h"
// Global variables
// Functions
void mmcInit(void)
{
// initialize SPI interface
spiInit();
// release chip select
sbi(MMC_CS_DDR, MMC_CS_PIN);
sbi(MMC_CS_PORT,MMC_CS_PIN);
}
u08 mmcReset(void)
{
u08 i;
u08 retry;
u08 r1=0;
retry = 0;
do
{
// send dummy bytes with CS high before accessing
for(i=0;i<10;i++) spiTransferByte(0xFF);
// resetting card, go to SPI mode
r1 = mmcSendCommand(MMC_GO_IDLE_STATE, 0);
#ifdef MMC_DEBUG
rprintf("MMC_GO_IDLE_STATE: R1=0x%x\r\n", r1);
#endif
// do retry counter
retry++;
if(retry>10) return -1;
} while(r1 != 0x01);
// TODO: check card parameters for voltage compliance
// before issuing initialize command
retry = 0;
do
{
// initializing card for operation
r1 = mmcSendCommand(MMC_SEND_OP_COND, 0);
#ifdef MMC_DEBUG
rprintf("MMC_SEND_OP_COND: R1=0x%x\r\n", r1);
#endif
// do retry counter
retry++;
if(retry>100) return -1;
} while(r1);
// turn off CRC checking to simplify communication
r1 = mmcSendCommand(MMC_CRC_ON_OFF, 0);
#ifdef MMC_DEBUG
rprintf("MMC_CRC_ON_OFF: R1=0x%x\r\n", r1);
#endif
// set block length to 512 bytes
r1 = mmcSendCommand(MMC_SET_BLOCKLEN, 512);
#ifdef MMC_DEBUG
rprintf("MMC_SET_BLOCKLEN: R1=0x%x\r\n", r1);
#endif
// return success
return 0;
}
u08 mmcSendCommand(u08 cmd, u32 arg)
{
u08 r1;
// assert chip select
cbi(MMC_CS_PORT,MMC_CS_PIN);
// issue the command
r1 = mmcCommand(cmd, arg);
// release chip select
sbi(MMC_CS_PORT,MMC_CS_PIN);
return r1;
}
u08 mmcRead(u32 sector, u08* buffer)
{
u08 r1;
u16 i;
// assert chip select
cbi(MMC_CS_PORT,MMC_CS_PIN);
// issue command
r1 = mmcCommand(MMC_READ_SINGLE_BLOCK, sector<<9);
#ifdef MMC_DEBUG
rprintf("MMC Read Block R1=0x%x\r\n", r1);
#endif
// check for valid response
if(r1 != 0x00)
return r1;
// wait for block start
while(spiTransferByte(0xFF) != MMC_STARTBLOCK_READ);
// read in data
for(i=0; i<0x200; i++)
{
*buffer++ = spiTransferByte(0xFF);
}
// read 16-bit CRC
spiTransferByte(0xFF);
spiTransferByte(0xFF);
// release chip select
sbi(MMC_CS_PORT,MMC_CS_PIN);
// return success
return 0;
}
u08 mmcWrite(u32 sector, u08* buffer)
{
u08 r1;
u16 i;
// assert chip select
cbi(MMC_CS_PORT,MMC_CS_PIN);
// issue command
r1 = mmcCommand(MMC_WRITE_BLOCK, sector<<9);
#ifdef MMC_DEBUG
rprintf("MMC Write Block R1=0x%x\r\n", r1);
#endif
// check for valid response
if(r1 != 0x00)
return r1;
// send dummy
spiTransferByte(0xFF);
// send data start token
spiTransferByte(MMC_STARTBLOCK_WRITE);
// write data
for(i=0; i<0x200; i++)
{
spiTransferByte(*buffer++);
}
// write 16-bit CRC (dummy values)
spiTransferByte(0xFF);
spiTransferByte(0xFF);
// read data response token
r1 = spiTransferByte(0xFF);
if( (r1&MMC_DR_MASK) != MMC_DR_ACCEPT)
return r1;
#ifdef MMC_DEBUG
rprintf("Data Response Token=0x%x\r\n", r1);
#endif
// wait until card not busy
while(!spiTransferByte(0xFF));
// release chip select
sbi(MMC_CS_PORT,MMC_CS_PIN);
// return success
return 0;
}
u08 mmcCommand(u08 cmd, u32 arg)
{
u08 r1;
u08 retry=0;
// send command
spiTransferByte(cmd | 0x40);
spiTransferByte(arg>>24);
spiTransferByte(arg>>16);
spiTransferByte(arg>>8);
spiTransferByte(arg);
spiTransferByte(0x95); // crc valid only for MMC_GO_IDLE_STATE
// end command
// wait for response
// if more than 8 retries, card has timed-out
// return the received 0xFF
while((r1 = spiTransferByte(0xFF)) == 0xFF)
if(retry++ > 8) break;
// return response
return r1;
}
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