void
load_main(prog_t *prog)
{
void *module;
char *error_s;
ulong64 tv2,tv1;
tv1 = gettime_us();
module = dlopen (prog->filename, RTLD_LAZY|RTLD_GLOBAL);
if (!module)
die(1, "loading invoked application: '%s'\n", dlerror());
dlerror();
prog->entry = (entry_t)dlsym(module, "main");
error_s = dlerror();
tv2 = gettime_us();
info("opening of %s took %llu usec\n", prog->filename, tv2-tv1);
if (error_s != NULL)
die(1, "loading symbol 'main': '%s'\n", error_s);
}
int main(int argc,char **argv)
{
start_time=time(0);
start_usec=gettime_us();
int opt;
while ((opt = getopt(argc, argv, "b:s:l:c:")) != -1) {
switch (opt) {
case 'l': strcpy(serial_port,optarg); break;
case 's':
serial_speed=atoi(optarg);
switch(serial_speed) {
case 1000000:
case 1500000:
case 4000000:
case 230400: case 2000000: break;
default: usage();
}
break;
case 'b':
bitstream=strdup(optarg); break;
case 'c':
queue_command(optarg); break;
default: /* '?' */
usage();
}
}
if (argc-optind==1) usage();
// Load bitstream if file provided
if (bitstream) {
char cmd[1024];
snprintf(cmd,1024,"fpgajtag -a %s",bitstream);
fprintf(stderr,"%s\n",cmd);
system(cmd);
fprintf(stderr,"[T+%lldsec] Bitstream loaded\n",(long long)time(0)-start_time);
}
#ifndef APPLE
// Try to set USB serial port to low latency
{
char latency_timer[1024];
int offset=strlen(serial_port);
while(offset&&serial_port[offset-1]!='/') offset--;
snprintf(latency_timer,1024,"/sys/bus/usb-serial/devices/%s/latency_timer",
&serial_port[offset]);
int old_latency=999;
FILE *f=fopen(latency_timer,"r");
if (f) { fscanf(f,"%d",&old_latency); fclose(f); }
if (old_latency!=1) {
snprintf(latency_timer,1024,"echo 1 | sudo tee /sys/bus/usb-serial/devices/%s/latency_timer",
&serial_port[offset]);
printf("Attempting to reduce USB latency via '%s'\n",latency_timer);
system(latency_timer);
}
}
// And also another way
struct serial_struct serial;
ioctl(fd, TIOCGSERIAL, &serial);
serial.flags |= ASYNC_LOW_LATENCY;
ioctl(fd, TIOCSSERIAL, &serial);
#endif
errno=0;
fd=open(serial_port,O_RDWR);
if (fd==-1) {
fprintf(stderr,"Could not open serial port '%s'\n",serial_port);
perror("open");
exit(-1);
}
fcntl(fd,F_SETFL,fcntl(fd, F_GETFL, NULL)|O_NONBLOCK);
// Set higher speed on serial interface to improve throughput
set_speed(fd,2000000);
slow_write(fd,"\r+9\r",4,5000);
set_speed(fd,4000000);
stop_cpu();
sdhc_check();
if (queued_command_count) {
for(int i=0;i<queued_command_count;i++) execute_command(queued_commands[i]);
return 0;
} else {
char *cmd=NULL;
while((cmd=readline("MEGA65 SD-card> "))!=NULL) {
execute_command(cmd);
}
}
return 0;
}