asciidisplay_driver.c

/*
* asciidisplay_driver.c
* MD407 library
*/
/* declarations goes to 'libMD407.h' */
#include "libMD407.h"
/* Define variables here */

/* Define functions here */

general.c

/*
* general.c
* MD407 library
*/
/* declarations goes to 'libMD407.h' */
#include "libMD407.h"
#include "usart_driver"
#include "keypad_driver"
#include "asciidisplay_driver"

/* Define variables here */
static char *heap_end;

PDEV_DRIVER_DESC device_table[MAX_FILENO] =
{
	&StdIn,
	&StdOut,
	&StdErr,
	&KeyPad,
	&AsciiDisplay,
};

/* Define functions here */
void crt_init() {
	extern char __bss_start;
	extern char __bss_end;
	extern char __heap_low;
	extern char __heap_top;
	char *s;
	s = &__bss_start;
	while( s < &__bss_end)
		*s++ = 0;
	s = &__heap_low;
	while( s < &__heap_top )
		*s++ = 0;
		
	for( int i = 0; i < MAX_FILENO; i++ )
	{
		fd = device_table[i];
		if( fd‐>init != 0)
		(void) fd‐>init( 0 );
	}
}

void crt_deinit(void)
{
	
}

char* _sbrk( int incr) {
	extern char __heap_low;
	extern char __heap_top;
	char *prev_heap_end;
	if (heap_end == 0) {
		heap_end = &__heap_low;
	}
	prev_heap_end = heap_end;
	if (heap_end + incr > &__heap_top) {
		/* Heap and stack collision */
		errno = ENOMEM;
		return (char *)-1;
	}
	heap_end += incr;
	return (char *) prev_heap_end;
}

int _close(int file)
{
	return -1;
}

int _fstat(int file, struct stat *st)
{
	st‐>st_mode = S_IFCHR;
	return 0;
}

int _isatty(int file)
{
	return 1;
}

int _lseek(int file, int ptr, int dir)
{
	return 0;
}

int _open(const char *name, int flags, int mode)
{
	return -1;
}

int _read(int file, char *ptr, int len) {
	PDEV_DRIVER_DESC drvr;
	drvr = device_table[file];
	if(drvr == 0)
		return 0;
	return drvr‐>read(ptr,len);
}

int _write(int file, char *ptr, int len)
{
	PDEV_DRIVER_DESC drvr;
	drvr = device_table[file];
	if(drvr == 0)
		return 0;
	return drvr‐>write(ptr,len);
}

keypad_driver.c

/*
* keypad_driver.c
* MD407 library
*/
/* declarations goes to 'libMD407.h' */
#include "libMD407.h"
/* Define variables here */


/* Define functions here */

libMD407.c

/*
* libMD407.c
* Declaration of library functions, constants etc...
*/
/* declarations goes to 'libMD407.h' */
#include "libMD407.h"
#include "usart_driver.c"
#include "keypad_driver.c"
#include "asciidisplay_driver.c"

/* Define variables here */
static char *heap_end;

/*PDEV_DRIVER_DESC device_table[MAX_FILENO] =
{
	&StdIn,
	&StdOut,
	&StdErr,
	&KeyPad,
	&AsciiDisplay,
};*/

PDEV_DRIVER_DESC device_table[MAX_FILENO] =
{
	0,
	0,
	0,
	0,
	&AsciiDisplay,
};

/* Define functions here */
void crt_init() {
	extern char __bss_start;
	extern char __bss_end;
	extern char __heap_low;
	extern char __heap_top;
	char *s;
	s = &__bss_start;
	while(s < &__bss_end)
		*s++ = 0;
	s = &__heap_low;
	while(s < &__heap_top)
		*s++ = 0;
		
	for( int i = 0; i < MAX_FILENO; i++ )
	{
		*PDEV_DRIVER_DESC fd = device_table[i];
		if(fd->init != 0)
            (void) fd->init(0);
	}
}

void crt_deinit(void)
{
	
}

char* _sbrk( int incr) {
	extern char __heap_low;
	extern char __heap_top;
	char *prev_heap_end;
	if (heap_end == 0) {
		heap_end = &__heap_low;
	}
	prev_heap_end = heap_end;
	if (heap_end + incr > &__heap_top) {
		/* Heap and stack collision */
		errno = ENOMEM;
		return (char *)-1;
	}
	heap_end += incr;
	return (char *) prev_heap_end;
}

int _close(int file)
{
	return -1;
}

int _fstat(int file, struct stat *st)
{
	st->st_mode = S_IFCHR;
	return 0;
}

int _isatty(int file)
{
	return 1;
}

int _lseek(int file, int ptr, int dir)
{
	return 0;
}

int _open(const char *name, int flags, int mode)
{
	return -1;
}

int _read(int file, char *ptr, int len) {
	PDEV_DRIVER_DESC drvr;
	drvr = device_table[file];
	if(drvr == 0)
		return 0;
	return drvr->read(ptr,len);
}

int _write(int file, char *ptr, int len)
{
	PDEV_DRIVER_DESC drvr;
	drvr = device_table[file];
	if(drvr == 0)
		return 0;
	return drvr->write(ptr,len);
}

libMD407.h

/*
*	libNAME.h
*	Declaration of library functions, constants etc...
*/
#include <stdio.h>
#include <errno.h>
#include <sys/stat.h>

#ifndef HEADER_H
#define HEADER_H

// Rest of header file contents go here


/* Type definitions */
typedef struct
{
	char name[16];
	int (*init) (int);
	void (*deinit) (int);
	int (*fstat)(struct stat *st);
	int (*isatty)(void);
	int (*open)(const char name,int flags,int mode);
	int (*close)(void);
	int (*lseek)(int ptr, int dir);
	int (*write)(char *ptr, int len);
	int (*read)(char *ptr, int len);
} DEV_DRIVER_DESC, *PDEV_DRIVER_DESC;

/* Constants */
#define MAX_FILENO 5

/* Constant defined by linker */
extern char __heap_low;
extern char __heap_top;
extern char __bss_start;
extern char __bss_end;

/* Library defined functions */
void crt_init(void);
void crt_deinit(void);

char *_sbrk(int);
int _close(int file);
int _fstat(int file, struct stat *st);
int _isatty(int file);
int _lseek(int file, int ptr, int dir);
int _open(const char *name, int flags, int mode);
int _read(int file, char *ptr, int len);
int _write(int file, char *ptr, int len);

#endif

usart_driver.c

/*
* usart_driver.c
* MD407 library
*/
/* declarations goes in 'libMD407.h' */
#include "libMD407.h"

/* Define functions here */
void usart_init(int initval) {
	
}

void usart_deinit(int deinitval) {

}

void usart_isatty(void) {
	
}

int usart_write(char *ptr, int len) {

}

int usart_read(char *ptr, int len) {

}