void MainWindow::jumpToSelectedAddress() {
if (auto address = cxxView_->getIntegerUnderCursor()) {
if (jumpToAddress(*address)) {
instructionsView_->show();
}
}
}
void MainWindow::jumpToSymbolAddress() {
if (auto symbol = symbolsView_->selectedSymbol()) {
if (symbol->value()) {
if (jumpToAddress(*symbol->value())) {
instructionsView_->show();
}
}
}
}
void Cpu::processInstruction() {
switch (_ir) {
case 1: // load value
_ac = fetchInstruction();
break;
case 2: // load value at the address into the AC
_ac = readFromMemory(fetchInstruction());
break;
case 3: // Use the AC value as an address to a another value.
// this new value is also used as an address to the final value.
_ac = readFromMemory(readFromMemory(fetchInstruction()));
break;
case 4: // load the value at address + X into the AC
_ac = readFromMemory(fetchInstruction() + _x);
break;
case 5: // load the value at the address + Y into the AC
_ac = readFromMemory(fetchInstruction() + _y);
break;
case 6: // from from sp + X into the AC
_ac = readFromMemory(_sp + _x);
break;
case 7: // store the AC value into the following address
writeToMemory(fetchInstruction(), _ac);
break;
case 8: // Get a random integer from interval [1, 100]
putRandInAC();
break;
case 9: // write the AC to the screen as an integer if following value is 1
// or as an char if the following value is 2
putPort();
break;
case 10: // add the value in X to the AC
_ac = _ac + _x;
break;
case 11: // add the value in Y to the AC
_ac = _ac + _y;
break;
case 12: // subtract the value in X from the AC
_ac = _ac - _x;
break;
case 13: // subtract the value in Y from the AC
_ac = _ac - _y;
break;
case 14: // Copy AC to X
_x = _ac;
break;
case 15: // Copy X to AC
_ac = _x;
break;
case 16: // Copy AC to Y
_y = _ac;
break;
case 17: // Copy Y to AC
_ac = _y;
break;
case 18: // Copy AC to SP
_sp = _ac;
break;
case 19: // Copy SP to AC
_ac = _sp;
break;
case 20: // Jump to following address
jumpToAddress(fetchInstruction());
break;
case 21: // jump to address if AC == 0
if (_ac == 0)
jumpToAddress(fetchInstruction());
else
_pc++;
break;
case 22: // jump to address if AC != 0
if (_ac != 0)
jumpToAddress(fetchInstruction());
else
_pc++;
break;
case 23: // push return address onto the stack and jump to the following address
callAddress();
break;
case 24: // return from stack
jumpToAddress(pop());
break;
case 25:
_x++;
break;
case 26:
_x--;
break;
case 27:
push(_ac);
break;
case 28:
_ac = pop();
break;
case 29: // Set system mode, switch stack, push SP and PC, set new SP and PC
if (_interruptEnabled)
interrupt(INTERRUPT_HANDLER_ADDRESS);
break;
case 30: // restore registers and set to user mode
if (_inSystemMode)
returnFromInterrupt();
break;
}
}
int main(int argc, char *argv[])
{
int speed = B115200;
const char *device = "/dev/ttyUSB0";
unsigned char x;
int fd, n;
unsigned char buf[32768];
unsigned do_erase = 0;
unsigned do_write = 0;
unsigned do_exec = 0;
unsigned addr = 0;
if (argc < 2)
return usage();
if (!strcmp(argv[1],"erase")) {
do_erase = 1;
} else if (!strcmp(argv[1],"flash")) {
do_erase = 1;
do_write = 1;
addr = 0x08000000;
} else if (!strcmp(argv[1],"exec")) {
do_write = 1;
do_exec = 1;
addr = 0x20001000;
} else {
return usage();
}
if (do_write && argc != 3)
return usage();
fd = openserial(device, speed);
if (fd < 0) {
fprintf(stderr, "stderr open '%s'\n", device);
return -1;
}
n = TIOCM_DTR;
ioctl(fd, TIOCMBIS, &n);
usleep(2500);
ioctl(fd, TIOCMBIC, &n);
usleep(2500);
/* If the board just powered up, we need to send an ACK
* to auto-baud and will get an ACK back. If the board
* is already up, two ACKs will get a NAK (invalid cmd).
* Either way, we're talking!
*/
for (n = 0; n < 5; n++) {
unsigned char SYNC = 0x7F;
if (write(fd, &SYNC, 1)) { /* do nothing */ }
if (read(fd, &x, 1) != 1)
continue;
if ((x == 0x79) || (x == 0x1f))
break;
}
if (n == 5) {
fprintf(stderr,"sync failure\n");
return -1;
}
#if 0
readMemory(fd, 0x1FFFF000, buf, 4096);
for (n = 0; n < 1024; n++)
fprintf(stderr,"%02x ", buf[n]);
return 0;
#endif
if (do_write) {
int fd2 = open(argv[2], O_RDONLY);
n = read(fd2, buf, sizeof(buf));
close(fd2);
if ((fd2 < 0) || (n <= 0)) {
fprintf(stderr,"cannot read '%s'\n", argv[2]);
return -1;
}
n += (n % 4);
if (do_erase) {
fprintf(stderr,"erasing flash...\n");
if (eraseFlash(fd)) {
fprintf(stderr,"erase failed\n");
return -1;
}
}
fprintf(stderr,"sending %d bytes...\n", n);
if (writeMemory(fd, addr, buf, n)) {
fprintf(stderr,"write failed\n");
return -1;
}
fprintf(stderr,"done\n");
if (do_exec) {
jumpToAddress(fd, addr);
} else {
return 0;
}
} else if (do_erase) {
if (eraseFlash(fd)) {
fprintf(stderr,"erase failed\n");
return -1;
}
fprintf(stderr,"flash erased\n");
return 0;
}
for (;;) {
if (read(fd, &x, 1) == 1) {
if (x == 27) break;
if ((x < 0x20) || (x > 0x7f))
if ((x != 10) && (x != 13))
x = '.';
fprintf(stderr,"%c", x);
}
}
return 0;
}
void Cpu::callAddress() {
const int address = fetchInstruction();
push(_pc);
jumpToAddress(address);
}