/*
Copyright (C) Magna Carta Software, Inc. 1988-1990.  All Rights Reserved.

Z80SIO03.C -- BISYNC reception using the Z-80 SIO
*/

#include <comm.h>
#include <z80sio.h>
#include <cursor.h>
#include <conio.h>
#include <ctype.h>
#include <dos.h>


/* MANIFEST CONSTANTS AND MACROS */
#define MENU            ALT_M           /* key for command summary */
#define AST             0X300           /* base address of AST CC-232 */


/* FUNCTION PROTOTYPES */
void                do_data_menu(COMM_PORT * p_port);
long                do_speed_menu(COMM_PORT * p_port);
short               menu(COMM_PORT *p);
void                term(COMM_PORT *p);
void INTERRUPT_     uz80_bisync_rxint(void);


/* GLOBAL VARIABLES */
BYTE        ztxbuf[2048];               /* TRANSMIT BUFFER FOR Z-80 SIO */
BYTE        zrxbuf[2048];               /* RECEIVE BUFFER FOR Z-80 SIO */
int         vers = 3;

#include "sioport.c"
COMM_PORT * sio0 = &z80;

/* ------------------------ PROGRAM BEGINS HERE --------------------------- */
int main(void)
{
    z80.uart.uz80sio = uz80;
    /* Z-80 SIO INITIALIZATION */
    u2.uz80sio = uz80;
    if (c_open(&z80) == PORT_ALREADY_OPEN) {
        fprintf(stderr, "\aError: Cannot open port1");
        mspause(1000);
        return (EOF);
    }
    uz80_mod_reg(&z80, WR3, ~UZ80_RX_ENABLE, 0);
    uz80_set_reg(&z80, WR0, UZ80_RX_CRC_RESET);
    uz80_set_reg(&z80, WR2, 0);                 /* interrupt vector */
/*  uz80_mod_reg(&z80, WR3, ~UZ80_AUTO_ENABLE, UZ80_AUTO_ENABLE); */
    uz80_mod_reg(&z80, WR4, ~UZ80_STOPBITS_MASK, UZ80_STOPBITS0);
    uz80_mod_reg(&z80, WR4, ~UZ80_SYNC_MASK, UZ80_BISYNC);
    uz80_mod_reg(&z80, WR4, ~UZ80_CLOCK_MASK, X1);
    uz80_mod_reg(&z80, WR5, ~UZ80_CRC16_MASK, UZ80_CRC16_MASK);
    uz80_mod_reg(&z80, WR5, ~UZ80_DTR_MASK, UZ80_DTR_MASK);
    uz80_mod_reg(&z80, WR3, ~UZ80_SYNC_INHIBIT, UZ80_SYNC_INHIBIT);
/*  uz80_mod_reg(&z80, WR3, ~UZ80_RX_CRC_ENABLE, UZ80_RX_CRC_ENABLE); */
    uz80_mod_reg(&z80, WR3, ~UZ80_HUNT_ENTER, UZ80_HUNT_ENTER);
    uz80_mod_reg(&z80, WR3, ~UZ80_RX_DATABITS_MASK, UZ80_RX_DATA8);
    uz80_set_reg(&z80, WR6, SYN);
    uz80_set_reg(&z80, WR7, SYN);
    /* STATUS EFFECTS VECTOR, EXTERNAL INT. ENABLE, RX INT. ENABLE */
    uz80_mod_reg(&z80, WR1, ~0X1D, 0X1D);
    uz80_mod_reg(&z80, WR3, ~UZ80_RX_ENABLE, UZ80_RX_ENABLE);
#if 0
    uz80_mod_reg(&z80, WR3, ~UZ80_SYNC_INHIBIT, UZ80_SYNC_INHIBIT);
    uz80_mod_reg(&z80, WR3, ~UZ80_HUNT_ENTER, UZ80_HUNT_ENTER);
    uz80_mod_reg(&z80, WR3, ~UZ80_RX_DATABITS_MASK, UZ80_RX_DATA8);
#endif
    /* INSTALL THE INTERRUPT HANDLERS */
    uz80_install_ipr(&z80, UZ80_RX_ALL, NULL, zrxbuf, sizeof(zrxbuf));
    uz80_install_ipr(&z80, UZ80_ES, NULL, NULL, 0);
    install_isr(&z80, 2, (void far *) uz80_bisync_rxint);

    printf("CCT Z-80 SIO Version %d: Press Alt-M for a list of commands\n", vers);
    term(&z80);
    printf("\nEnd of CCT Z-80 SIO%d\n", vers);

    set_dtr(&z80, LOW);
    uz80_mod_reg(&z80, WR3, ~UZ80_RX_ENABLE, 0);

    return (0);
}



/*
TERM -- The terminal emulation routine. Simply polls the COM port and the
keyboard alternately for characters.
*/
void term(COMM_PORT *p_port)
{
    short c;              /* must be signed to detect a -1 return */

    /* THESE LINES CONTROL THE RECEIVED DATA FORMAT */
    set_rx_xlat(p_port, XLAT, TRUE);
    set_rx_xlat(p_port, EOL, FALSE);
    set_rx_xlat(p_port, LOCAL_ECHO, ON);

    /* THESE LINES CONTROL THE TRANSMITTED DATA FORMAT */
    set_tx_xlat(p_port, XLAT, TRUE);
    set_tx_xlat(p_port, ASCII_ONLY, TRUE);

    for (;;) {
        /* CHECK SERIAL PORT FOR BYTE */
        while ((c = c_getc(p_port)) != EOF);

        /* CHECK KEYBOARD FOR A KEY PRESS */
        if ( (c = inkey()) != EOF) {
            if (c == MENU) {
                if (menu(p_port) == 1) break;
            }
            else c_putc(p_port, c);
        }
    }
}


#define DATA_FORMAT 'D'                /* key to set speed */
#define DATA_SPEED  'S'                /* key to set speed */
#define EXIT        'Q'                /* key to exit from main */
#define SEND_STR    'T'

short menu(COMM_PORT *p_port)
{
    short c, retval = 0, DONE = FALSE;
    static char *menus[] = {
        "\tD.  Data Format",
        "\tS.  Data Transfer Rate.",
        "\tT.  Transmit a string",
        "\tQ.  EXIT from COMM.",
        NULL
    };
    char **p_menu;

    c = !EXIT;
    while (!DONE) {
        puts("\n\n");
        for (p_menu = menus; *p_menu != NULL; p_menu++) printf("%s\n", *p_menu);
        printf("\n\t\t Enter selection (CR to quit menu) :  ");
        if ( (c = getch()) == CR) break;        /* return to term */
        c = toupper(c);
        switch (c) {
            case EXIT:
                retval = 1;
                DONE = TRUE;
                break;

            case DATA_FORMAT:
                do_data_menu(p_port);
                break;

            case DATA_SPEED:
                do_speed_menu(p_port);
                break;

            case SEND_STR:
                c_putn(p_port, 8L, "ATS0=1X4");
                DONE = TRUE;
                break;

            default:
                puts("Invalid choice\n\007");
                DONE = TRUE;
                break;
        }
    }
    puts("\nExiting menu");

    return (retval);                /* will be zero except if EXIT */
}



char *parity_strings[] = {"NONE","ODD","EVEN","MARK","SPACE"};

/*
DO_DATA_MENU -- Show a menu for setting the data format.
*/
void do_data_menu(COMM_PORT * p_port)
{
    short key, DONE = FALSE;

    do {
        puts("\nSET THE DATA FORMAT");
        printf("\nFormat: %d Data bits, %s Parity, %d Stopbits",
            p_port->rxdatabits,
            parity_strings[p_port->parity],
            p_port->stopbits
            );
        puts("\nA. Set number of databits");
        puts("B. Set number of stopbits");
        puts("C. Set parity");
        puts("\nAny other key exits");
        key = toupper(bios_key(0) & 0XFF);
        switch (key) {
            case 'A':
                puts("\nEnter databits (5, 6, 7 or 8): ");
                key = bios_key(0) & 0XF;
                set_databits(p_port, key);
                break;

            case 'B':
                puts("\nEnter stopbits (1 or 2): ");
                key = bios_key(0) & 0XF;
                set_stopbits(p_port, key);
                break;

            case 'C':
                puts("\nEnter parity ('N' for none, 'E' for even, etc.): ");
                key = toupper(bios_key(0) & 0XFF);
                if (key == 'N') set_parity(p_port, PARITY_NONE);
                else if (key == 'E') set_parity(p_port, PARITY_EVEN);
                else if (key == 'O') set_parity(p_port, PARITY_ODD);
                else if (key == 'M') set_parity(p_port, PARITY_MARK);
                else if (key == 'S') set_parity(p_port, PARITY_SPACE);
                else puts("\nNot recognized.  Use 'N', 'E', 'O', 'M' or 'S'");
                break;

            default:
                DONE = TRUE;
                break;
        }
    } while (!DONE);

    printf("\nFormat now : %d Data bits, %s Parity, %d Stopbits",
            p_port->rxdatabits,
            parity_strings[p_port->parity],
            p_port->stopbits
            );
}



/*
DO_SPEED_MENU -- Show a menu for setting the data tranfer rate.
*/
long do_speed_menu(COMM_PORT *p_port)
{
    short key;
    long ret;

    do {
        puts("\nSET THE DATA TRANSFER SPEED");
        printf("\nSpeed:  %ld bits-per-second\n", p_port->speed);
        puts("\nA. Data transfer rate     50    bits-per-second");
        puts("B. Data transfer rate     75    bits-per-second");
        puts("C. Data transfer rate    110    bits-per-second");
        puts("D. Data transfer rate    134.5  bits-per-second");
        puts("E. Data transfer rate    150    bits-per-second");
        puts("F. Data transfer rate    300    bits-per-second");
        puts("G. Data transfer rate    600    bits-per-second");
        puts("H. Data transfer rate   1200    bits-per-second");
        puts("I. Data transfer rate   2400    bits-per-second");
        puts("J. Data transfer rate   4800    bits-per-second");
        puts("K. Data transfer rate   9600    bits-per-second");
        puts("L. Data transfer rate  19200    bits-per-second");
        puts("M. Data transfer rate  38400    bits-per-second");
        puts("N. Data transfer rate  57600    bits-per-second");
        puts("O. Data transfer rate 115200    bits-per-second");
        printf("\n\tNew data transfer rate: ");

        key = toupper(bios_key(0) & 0XFF);
    } while (key < 'A' || key > 'O');

    switch (key) {
        case 'A':
            ret = 50;
            break;
        case 'B':
            ret = 75;
            break;
        case 'C':
            ret = 110;
            break;
        case 'D':
            puts("\nSorry, that data transfer rate not supported");
            ret = EOF;
            break;
        case 'E':
            ret = 150;
            break;
        case 'F':
            ret = 300;
            break;
        case 'G':
            ret = 600;
            break;
        case 'H':
            ret = 1200;
            break;
        case 'I':
            ret = 2400;
            break;
        case 'J':
            ret = 4800;
            break;
        case 'K':
            ret = 9600;
            break;
        case 'L':
            ret = 19200;
            break;
        case 'M':
            ret = 38400L;
            break;
        case 'N':
            ret = 57600L;
            break;
        case 'O':
            ret = 115200L;
            break;
        default:
            ret = EOF;
    }
    if (ret != EOF) {
        set_speed(p_port, ret);
        printf("\nSpeed now set to: %ld bits-per-second\n", p_port->speed);
    }
    return ((long) ret);
}



/*
UZ80_BYSYNC_RXINT -- Interrupt handler for the Z-80 SIO to perform BISYNC.
Enables RX, TX, ES interrupts
For use under the IBM architecture.
*/
void INTERRUPT_ uz80_bisync_rxint(void)
{
    static BYTE c, rx_lastchar;
    static volatile BYTE far *b_ptr;

    outp(z80.ubase_addr, 2);    /* toggle the reg. ptr. to RR2 */
    c = (BYTE) (inp(z80.ubase_addr) & 0XE);

    /* EXTERNAL STATUS CHANGE (DCD, CTS, or SYNC) */
    if (c & 2) {
        uz80_set_reg(&z80, WR0, UZ80_ES_RESET);
    }
    /* RX CHARACTER AVAILABLE */
    if (c & 4) {
        if (inp(z80.ubase_addr) & 1) {   /* IF a char is ready get it */
            b_ptr = z80.rxbufhead + 1;
            if (b_ptr > z80.rxbufend) b_ptr = z80.rxbuf;
            if (!(b_ptr == z80.rxbuftail)) {         /* buffer is full */
                rx_lastchar = *z80.rxbufhead = (BYTE) inp(z80.udata_reg_addr);
                z80.rxbufhead = b_ptr;
            }
        }
    }
    else if (c & 6) {   /* SPECIAL RECEIVE CONDITION (Parity error, RX Overrrun, CRC Error */
#if defined(CCT_TEST)
        outp(AST+3,1);              /* read register 1 for int type */
        rr1 = inp(AST+3);

        if (rr1 & 0X20) {
            c = 'o';                /* receiver overrun error */
            outp(AST+3, 0X30);      /* issue error reset command */
            if (inp(AST+3) & 1) inp(AST+3); /* IF a char is ready get it */
        }
        else if (rr1 & 0X40) {
            c = 'f';                /* receiver framing error */
            outp(AST+3, 0X30);      /* issue error reset command */
            if (inp(AST+3) & 1) inp(AST+1); /* IF a char is ready get it */
        }
#endif
    }
    disable();
    outp(EOINT, 0X20);        /* Send EOI to 8259 */
}