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#include <mcs51reg.h>
#include <stdio.h>
enum sif_command {
DETECT_SIGN = '!', // answer to detect command
SIFCM_DETECT = '_', // command used to detect the interface
SIFCM_COMMANDS = 'i', // get info about commands
SIFCM_IFVER = 'v', // interface version
SIFCM_SIMVER = 'V', // simulator version
SIFCM_IFRESET = '@', // reset the interface
SIFCM_CMDINFO = 'I', // info about a command
SIFCM_CMDHELP = 'h', // help about a command
SIFCM_STOP = 's', // stop simulation
SIFCM_PRINT = 'p', // print character
SIFCM_FIN_CHECK = 'f', // check input file for input
SIFCM_READ = 'r', // read from input file
SIFCM_WRITE = 'w', // write to output file
};
enum sif_answer_type {
SIFAT_UNKNOWN = 0x00, // we don't know...
SIFAT_BYTE = 0x01, // just a byte
SIFAT_ARRAY = 0x02, // array of some bytes
SIFAT_STRING = 0x03, // a string
SIFAT_NONE = 0x04 // no answer at all
};
unsigned char
_sdcc_external_startup (void)
{
/* copied from device/examples/mcs51/simple2/hi.c */
PCON = 0x80; /* power control byte, set SMOD bit for serial port */
SCON = 0x40; /* serial control byte, mode 1, RI _NOT_ active */
TMOD = 0x21; /* timer control mode, byte operation */
TCON = 0; /* timer control register, byte operation */
TH1 = 0xFA; /* serial reload value, 9,600 baud at 11.0952Mhz */
TR1 = 1; /* start serial timer */
TI = 1; /* enable transmission of first byte */
return 0;
}
int
putchar (int c)
{
while (!TI)
;
SBUF = c;
TI = 0;
return c;
}
#define SIF_ADDRESS_SPACE_NAME "xram"
#define SIF_ADDRESS_SPACE __xdata
#define SIF_ADDRESS 0xffff
unsigned char SIF_ADDRESS_SPACE * volatile sif;
char
sif_get(char cmd)
{
*sif= cmd;
return *sif;
}
char
simulated(void)
{
unsigned char c;
*sif= 0x55;
c= *sif;
if (c != (unsigned char)~0x55)
return(0);
*sif= 0xaa;
if (*sif != (unsigned char)~0xaa)
return(0);
return(1);
}
char
detect(void)
{
*sif= SIFCM_DETECT;
return *sif == DETECT_SIGN;
}
int nuof_commands;
unsigned char commands[100];
void
get_commands(void)
{
int i;
*sif= SIFCM_COMMANDS;
nuof_commands= *sif;
for (i= 0; i < nuof_commands; i++)
commands[i]= *sif;
}
int
get_ifversion(void)
{
*sif= SIFCM_IFVER;
return(*sif);
}
unsigned char sim_version[15];
void
get_sim_version()
{
unsigned char c, i, n;
*sif= SIFCM_SIMVER;
sim_version[0]= 0;
n= *sif;
if (n)
{
i= 0;
c= *sif;
while (c && (i<14))
{
sim_version[i++]= c;
c= *sif;
}
while (c)
c= *sif;
sim_version[i]= 0;
}
}
void
print_cmd_infos(void)
{
int i, j;
unsigned char inf[5];
for (i= 0; i < nuof_commands; i++)
{
printf("Command '%c' info:\n", commands[i]);
*sif= SIFCM_CMDINFO;
*sif= commands[i];
inf[0]= *sif;
for (j= 0; j < inf[0]; j++)
{
inf[j+1]= *sif;
//printf(" 0x%02x", inf[j+1]);
}
printf(" need %d params, answers as ", inf[1]);
switch (inf[2])
{
case SIFAT_UNKNOWN : printf("unknown"); break;
case SIFAT_BYTE : printf("byte"); break;
case SIFAT_ARRAY : printf("array"); break;
case SIFAT_STRING : printf("string"); break;
case SIFAT_NONE : printf("none"); break;
}
printf(": ");
*sif= SIFCM_CMDHELP;
*sif= commands[i];
if (*sif)
{
j= *sif;
while (j)
{
putchar(j);
j= *sif;
}
}
printf("\n");
}
}
void
sif_putchar(char c)
{
*sif= SIFCM_PRINT;
*sif= c;
}
void
sif_print(char *s)
{
while (*s)
sif_putchar(*s++);
}
void
fout_demo(char *s)
{
while (*s)
{
*sif= SIFCM_WRITE;
*sif= *s++;
}
}
char
sif_fin_avail()
{
return sif_get(SIFCM_FIN_CHECK);
}
char
sif_read()
{
return sif_get(SIFCM_READ);
}
void
fin_demo()
{
char i, c;
printf("Reading input from SIMIF input file:\n");
while (i= sif_fin_avail())
{
c= sif_read();
if (c > 31)
putchar(c);
}
printf("\nRead demo finished\n");
}
void
main(void)
{
sif= (unsigned char SIF_ADDRESS_SPACE *) SIF_ADDRESS;
printf("Testing simulator interface at %s[0x%x]\n",
SIF_ADDRESS_SPACE_NAME, SIF_ADDRESS);
printf("%s", detect()?"Interface found.":"Interface not found");
if (detect())
{
int i;
i= get_ifversion();
get_sim_version();
printf(" Version %d (of simulator %s)\n", i, sim_version);
get_commands();
printf("Interface knows about %d commands:\n", nuof_commands);
for (i= 0; i < nuof_commands; i++)
printf("%c", commands[i]);
printf("\n");
print_cmd_infos();
sif_print("Message from simulated program: Hello World!\n");
fout_demo("Write this message\n"
"to simif output file.\n"
"\n"
"Done.\n");
fin_demo();
}
else
printf("\n");
//* (char __idata *) 0 = * (char __xdata *) 0x7654;
*sif= SIFCM_STOP;
}
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