main.cpp

/*
  MSP430 Emulator
  Copyright (C) 2022 Rudolf Geosits (rgeosits@live.esu.edu)
  
  "MSP430 Emulator" is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  "MSP430 Emulator" is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program. If not, see <https://www.gnu.org/licenses/>.
*/

#include "main.h"

int main(int argc, char *argv[])
{
    Emulator *emu = (Emulator *) calloc( 1, sizeof(Emulator) );
    Cpu *cpu = NULL; Debugger *deb = NULL;

    emu->cpu       = (Cpu *) calloc(1, sizeof(Cpu));
    emu->cpu->bcm  = (Bcm *) calloc(1, sizeof(Bcm));
    emu->cpu->timer_a  = (Timer_a *) calloc(1, sizeof(Timer_a));
    emu->cpu->p1   = (Port_1 *) calloc(1, sizeof(Port_1));
    emu->cpu->usci = (Usci *) calloc(1, sizeof(Usci));  

    emu->debugger  = (Debugger *) calloc(1, sizeof(Debugger));
    setup_debugger(emu);

    cpu = emu->cpu;
    deb = emu->debugger;

    deb->server = (Server *) calloc(1, sizeof(Server));

    if (deb->web_interface == true)
    {
        if (argv[1] == NULL)
        {
            puts("Need port argument");
            return(1);
        }
    
        deb->ws_port = strtoul(argv[1], NULL, 10);

        pthread_t *t = &deb->web_server_thread;

        if ( pthread_create(t, NULL, web_server, (void *)emu ) )
        {
            fprintf(stderr, "Error creating web server thread\n");
            return 1;
        }
    
        while (!deb->web_server_ready)
            usleep(10000);

        print_console(emu, " [MSP430 Emulator]\n Copyright (C) 2022 Rudolf Geosits (rgeosits@live.esu.edu)\n");
        print_console(emu, " [!] Upload your firmware (ELF format only); Type 'h' for debugger options.\n\n");

        while (!deb->web_firmware_uploaded)
            usleep(10000);
    }

    //register_signal(SIGINT); // Register Callback for CONTROL-c
  
    initialize_msp_memspace();
    initialize_msp_registers(emu);  

    setup_bcm(emu);
    setup_timer_a(emu);
    setup_port_1(emu);
    setup_usci(emu);
  
    load_bootloader(0x0C00);

    if (deb->web_interface)
        load_firmware(emu, (char*)"tmp.bin", 0xC000);
    
    // display first round of registers
    display_registers(emu);
    disassemble(emu, cpu->pc, 1);
    update_register_display(emu);

    // Fetch-Decode-Execute Cycle (run machine)
    while (!deb->quit)
    {
        // Handle debugger when CPU is not running
        if (!cpu->running)
        {
            usleep(10000);
            continue;
        }

        // Handle Breakpoints
        handle_breakpoints(emu);
        
        // Instruction Decoder
        decode(emu, fetch(emu), EXECUTE); 
        
        // Handle Peripherals
        handle_bcm(emu);
        handle_timer_a(emu);
        handle_port_1(emu);
        handle_usci(emu);

        // Average of 4 cycles per instruction
        mclk_wait_cycles(emu, 4);
    }

    uninitialize_msp_memspace();
    free(cpu->timer_a);
    free(cpu->bcm);
    free(cpu->p1);
    free(cpu->usci);
    free(cpu);
    free(deb->server);
    free(deb);
    free(emu);

    return 0;
}