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#include <avr/io.h>
#include "fat16.h"
#include "ssc.h"
//________________________________________________________________________________________________________________________________________
// Module name: fat16.c
// Compiler used: avr-gcc 3.4.5
// Last Modifikation: 24.07.2007
// Version: 1.03
// Authors: Stephan Busker
// Description: Source files for access to the synchrnous serial channel.
// Copyright (C) 2007 Stephan Busker
//........................................................................................................................................
// Functions: extern void SSC_Init(void);
// extern u8 SSC_GetChar (void);
// extern void SSC_PutChar (u8 Byte);
// extern void SSC_Disable(void);
// extern void SSC_Enable(void);
//........................................................................................................................................
// ext. functions: extern u8 SDC_GetSector (u32,u8*);
// extern u8 SDC_PutSector (u32,u8*);
//........................................................................................................................................
//
// URL: www.Mikro-Control.de
// mailto: stephan.busker@mikro-control.de
//________________________________________________________________________________________________________________________________________
//________________________________________________________________________________________________________________________________________
// Funtion: SSC_Init(void);
//
// Description: This function initialises the synchronus serial channel to the sdcard.
//
//
// Returnvalue: none
//________________________________________________________________________________________________________________________________________
void SSC_Init(void)
{
MMC_Direction_REG &=~(1<<SPI_DI); // Set the direction of the ssc-port
MMC_Direction_REG |= (1<<SPI_Clock); // _______ _______
MMC_Direction_REG |= (1<<SPI_DO); // CS \________________________/
MMC_Direction_REG |= (1<<MMC_Chip_Select); //
MMC_Direction_REG |= (1<<SPI_SS); // ___ ___ ___
// clk __________/ \___/ \___/ \_________
//
SSC_Disable(); // ___ ___
// data_________/ \___________/ \___________
// initialise ssc, clock = Idel low
// devide clock by 32
SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR1)|(1<<CPOL); // Enable SSC in mastermode, invert clockpolarity (idle high)
SPSR = SPSR|(1<<SPI2X);
}
//________________________________________________________________________________________________________________________________________
// Funtion: void SSC_ClearRxFifo(void);
//
// Description: Clears the fifo of the ssc if the controller used has a builtin fifo.
//
//
// Returnvalue: none
//________________________________________________________________________________________________________________________________________
void SSC_ClearRxFifo(void)
{
// enter your code here to clear the rx-fifo of the ssc.
}
//________________________________________________________________________________________________________________________________________
// Funtion: SSC_GetChar(void);
//
// Description: This function reads one byte from the SSC
//
//
// Returnvalue: the byte received.
//________________________________________________________________________________________________________________________________________
u8 SSC_GetChar (void)
{
u8 Byte = 0;
SPDR = 0x00; // read one byte of data from the SSC
while(!(SPSR & (1<<SPIF))){}; // wait until the data has been read.
Byte = SPDR;
#ifdef __MMC_INTERFACE_INVERTED
return (~Byte);
#else
return (Byte); // the byte received
#endif
}
//________________________________________________________________________________________________________________________________________
// Funtion: SSC_PutChar(u8 Byte);
//
// Description: This function writes one byte to the SSC
//
//
// Returnvalue: none
//________________________________________________________________________________________________________________________________________
void SSC_PutChar (u8 Byte)
{
#ifdef __MMC_INTERFACE_INVERTED
SPDR = ~Byte; // send one byte of data to the SSC
#else
SPDR = Byte; // send one byte of data to the SSC
#endif
SPDR = ~Byte; // send one byte of data to the SSC
while(!(SPSR & (1<<SPIF))) // wait until data was send.
{
}
}
//________________________________________________________________________________________________________________________________________
// Funtion: SSC_Disable(void);
//
// Description: This function enables chipselect of the sdcard (active low)
//
//
// Returnvalue: none
//________________________________________________________________________________________________________________________________________
void SSC_Disable(void)
{
#ifdef __MMC_INTERFACE_INVERTED
MMC_Write &= ~(1<<MMC_Chip_Select); // disable chipselect of the sdcard (active low).
#else
MMC_Write |= (1<<MMC_Chip_Select); // enable chipselect of the sdcard (active low).
#endif
}
//________________________________________________________________________________________________________________________________________
// Funtion: SSC_Enable(void);
//
// Description: This function disables chipselect of the sdcard (active low)
//
//
// Returnvalue: none
//________________________________________________________________________________________________________________________________________
void SSC_Enable(void)
{
#ifdef __MMC_INTERFACE_INVERTED
MMC_Write |= (1<<MMC_Chip_Select); // enable chipselect of the sdcard (active low).
#else
MMC_Write &= ~(1<<MMC_Chip_Select); // disable chipselect of the sdcard (active low).
#endif
}