path: root/ldmicro/iolist.cpp

//-----------------------------------------------------------------------------
// Copyright 2007 Jonathan Westhues
//
// This file is part of LDmicro.
// 
// LDmicro 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.
// 
// LDmicro 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 LDmicro.  If not, see <http://www.gnu.org/licenses/>.
//------
//
// Routines to maintain the processor I/O list. Whenever the user changes the
// name of an element, rebuild the I/O list from the PLC program, so that new
// assigned names are automatically reflected in the I/O list. Also keep a 
// list of old I/Os that have been deleted, so that if the user deletes a
// a name and then recreates it the associated settings (e.g. pin number)
// will not be forgotten. Also the dialog box for assigning I/O pins.
// Jonathan Westhues, Oct 2004
//-----------------------------------------------------------------------------
#include <windows.h>
#include <commctrl.h>
#include <stdio.h>
#include <stdlib.h>

#include "ldmicro.h"

// I/O that we have seen recently, so that we don't forget pin assignments
// when we re-extract the list
#define MAX_IO_SEEN_PREVIOUSLY 512
static struct {
    char    name[MAX_NAME_LEN];
    int     type;
    int     pin;
} IoSeenPreviously[MAX_IO_SEEN_PREVIOUSLY];
static int IoSeenPreviouslyCount;

// stuff for the dialog box that lets you choose pin assignments
static BOOL DialogDone;
static BOOL DialogCancel;

static HWND IoDialog;

static HWND PinList;
static HWND OkButton;
static HWND CancelButton;

// stuff for the popup that lets you set the simulated value of an analog in
static HWND AnalogSliderMain;
static HWND AnalogSliderTrackbar;
static BOOL AnalogSliderDone;
static BOOL AnalogSliderCancel;


//-----------------------------------------------------------------------------
// Append an I/O to the I/O list if it is not in there already.
//-----------------------------------------------------------------------------
static void AppendIo(char *name, int type)
{
    int i;
    for(i = 0; i < Prog.io.count; i++) {
        if(strcmp(Prog.io.assignment[i].name, name)==0) {
            if(type != IO_TYPE_GENERAL && Prog.io.assignment[i].type ==
                IO_TYPE_GENERAL)
            {
                Prog.io.assignment[i].type = type;
            }
            // already in there
            return;
        }
    }
    if(i < MAX_IO) {
        Prog.io.assignment[i].type = type;
        Prog.io.assignment[i].pin = NO_PIN_ASSIGNED;
        strcpy(Prog.io.assignment[i].name, name);
        (Prog.io.count)++;
    }
}

//-----------------------------------------------------------------------------
// Move an I/O pin into the `seen previously' list. This means that if the
// user creates input Xasd, assigns it a pin, deletes, and then recreates it,
// then it will come back with the correct pin assigned.
//-----------------------------------------------------------------------------
static void AppendIoSeenPreviously(char *name, int type, int pin)
{
    if(strcmp(name+1, "new")==0) return;

    int i;
    for(i = 0; i < IoSeenPreviouslyCount; i++) {
        if(strcmp(name, IoSeenPreviously[i].name)==0 &&
            type == IoSeenPreviously[i].type)
        {
            if(pin != NO_PIN_ASSIGNED) {
                IoSeenPreviously[i].pin = pin;
            }
            return;
        }
    }
    if(IoSeenPreviouslyCount >= MAX_IO_SEEN_PREVIOUSLY) {
        // maybe improve later; just throw away all our old information, and
        // the user might have to reenter the pin if they delete and recreate
        // things
        IoSeenPreviouslyCount = 0;
    }

    i = IoSeenPreviouslyCount;
    IoSeenPreviously[i].type = type;
    IoSeenPreviously[i].pin = pin;
    strcpy(IoSeenPreviously[i].name, name);
    IoSeenPreviouslyCount++;
}

//-----------------------------------------------------------------------------
// Walk a subcircuit, calling ourselves recursively and extracting all the
// I/O names out of it.
//-----------------------------------------------------------------------------
static void ExtractNamesFromCircuit(int which, void *any)
{
    ElemLeaf *l = (ElemLeaf *)any;

    switch(which) {
        case ELEM_PARALLEL_SUBCKT: {
            ElemSubcktParallel *p = (ElemSubcktParallel *)any;
            int i;
            for(i = 0; i < p->count; i++) {
                ExtractNamesFromCircuit(p->contents[i].which,
                    p->contents[i].d.any);
            }
            break;
        }
        case ELEM_SERIES_SUBCKT: {
            ElemSubcktSeries *s = (ElemSubcktSeries *)any;
            int i;
            for(i = 0; i < s->count; i++) {
                ExtractNamesFromCircuit(s->contents[i].which,
                    s->contents[i].d.any);
            }
            break;
        }
        case ELEM_CONTACTS:
            switch(l->d.contacts.name[0]) {
                case 'R':
                    AppendIo(l->d.contacts.name, IO_TYPE_INTERNAL_RELAY);
                    break;

                case 'Y':
                    AppendIo(l->d.contacts.name, IO_TYPE_DIG_OUTPUT);
                    break;

                case 'X':
                    AppendIo(l->d.contacts.name, IO_TYPE_DIG_INPUT);
                    break;

                default:
                    oops();
                    break;
            }
            break;

        case ELEM_COIL:
            AppendIo(l->d.coil.name, l->d.coil.name[0] == 'R' ?
                IO_TYPE_INTERNAL_RELAY : IO_TYPE_DIG_OUTPUT);
            break;

        case ELEM_TON:
        case ELEM_TOF:
            AppendIo(l->d.timer.name, which == ELEM_TON ?  IO_TYPE_TON :
                IO_TYPE_TOF);
            break;

        case ELEM_RTO:
            AppendIo(l->d.timer.name, IO_TYPE_RTO);
            break;

        case ELEM_MOVE:
            AppendIo(l->d.move.dest, IO_TYPE_GENERAL);
            break;

        case ELEM_ADD:
        case ELEM_SUB:
        case ELEM_MUL:
        case ELEM_DIV:
            AppendIo(l->d.math.dest, IO_TYPE_GENERAL);
            break;

        case ELEM_FORMATTED_STRING:
            if(strlen(l->d.fmtdStr.var) > 0) {
                AppendIo(l->d.fmtdStr.var, IO_TYPE_UART_TX);
            }
            break;

        case ELEM_UART_SEND:
            AppendIo(l->d.uart.name, IO_TYPE_UART_TX);
            break;

        case ELEM_UART_RECV:
            AppendIo(l->d.uart.name, IO_TYPE_UART_RX);
            break;

        case ELEM_SET_PWM:
            AppendIo(l->d.setPwm.name, IO_TYPE_PWM_OUTPUT);
            break;

        case ELEM_CTU:
        case ELEM_CTD:
        case ELEM_CTC:
            AppendIo(l->d.counter.name, IO_TYPE_COUNTER);
            break;

        case ELEM_READ_ADC:
            AppendIo(l->d.readAdc.name, IO_TYPE_READ_ADC);
            break;

        case ELEM_SHIFT_REGISTER: {
            int i;
            for(i = 0; i < l->d.shiftRegister.stages; i++) {
                char str[MAX_NAME_LEN+10];
                sprintf(str, "%s%d", l->d.shiftRegister.name, i);
                AppendIo(str, IO_TYPE_GENERAL);
            }
            break;
        }

        case ELEM_LOOK_UP_TABLE:
            AppendIo(l->d.lookUpTable.dest, IO_TYPE_GENERAL);
            break;

        case ELEM_PIECEWISE_LINEAR:
            AppendIo(l->d.piecewiseLinear.dest, IO_TYPE_GENERAL);
            break;

        case ELEM_PLACEHOLDER:
        case ELEM_COMMENT:
        case ELEM_SHORT:
        case ELEM_OPEN:
        case ELEM_MASTER_RELAY:
        case ELEM_ONE_SHOT_RISING:
        case ELEM_ONE_SHOT_FALLING:
        case ELEM_EQU:
        case ELEM_NEQ:
        case ELEM_GRT:
        case ELEM_GEQ:
        case ELEM_LES:
        case ELEM_LEQ:
        case ELEM_RES:
        case ELEM_PERSIST:
            break;

        default:
            oops();
    }
}

//-----------------------------------------------------------------------------
// Compare function to qsort() the I/O list. Group by type, then 
// alphabetically within each section.
//-----------------------------------------------------------------------------
static int CompareIo(const void *av, const void *bv)
{
    PlcProgramSingleIo *a = (PlcProgramSingleIo *)av;
    PlcProgramSingleIo *b = (PlcProgramSingleIo *)bv;

    if(a->type != b->type) {
        return a->type - b->type;
    }

    if(a->pin == NO_PIN_ASSIGNED && b->pin != NO_PIN_ASSIGNED) return  1;
    if(b->pin == NO_PIN_ASSIGNED && a->pin != NO_PIN_ASSIGNED) return -1;

    return strcmp(a->name, b->name);
}

//-----------------------------------------------------------------------------
// Wipe the I/O list and then re-extract it from the PLC program, taking
// care not to forget the pin assignments. Gets passed the selected item
// as an index into the list; modifies the list, so returns the new selected
// item as an index into the new list.
//-----------------------------------------------------------------------------
int GenerateIoList(int prevSel)
{
    int i, j;

    char selName[MAX_NAME_LEN];
    if(prevSel >= 0) {
        strcpy(selName, Prog.io.assignment[prevSel].name);
    }

    if(IoSeenPreviouslyCount > MAX_IO_SEEN_PREVIOUSLY/2) {
        // flush it so there's lots of room, and we don't run out and
        // forget important things
        IoSeenPreviouslyCount = 0;
    }
    
    // remember the pin assignments
    for(i = 0; i < Prog.io.count; i++) {
        AppendIoSeenPreviously(Prog.io.assignment[i].name,
            Prog.io.assignment[i].type, Prog.io.assignment[i].pin);
    }
    // wipe the list
    Prog.io.count = 0;
    // extract the new list so that it must be up to date
    for(i = 0; i < Prog.numRungs; i++) {
        ExtractNamesFromCircuit(ELEM_SERIES_SUBCKT, Prog.rungs[i]);
    }

    for(i = 0; i < Prog.io.count; i++) {
        if(Prog.io.assignment[i].type == IO_TYPE_DIG_INPUT ||
           Prog.io.assignment[i].type == IO_TYPE_DIG_OUTPUT ||
           Prog.io.assignment[i].type == IO_TYPE_READ_ADC)
        {
            for(j = 0; j < IoSeenPreviouslyCount; j++) {
                if(strcmp(Prog.io.assignment[i].name, 
                    IoSeenPreviously[j].name)==0)
                {
                    Prog.io.assignment[i].pin = IoSeenPreviously[j].pin;
                    break;
                }
            }
        }
    }

    qsort(Prog.io.assignment, Prog.io.count, sizeof(PlcProgramSingleIo),
        CompareIo);

    if(prevSel >= 0) {
        for(i = 0; i < Prog.io.count; i++) {
            if(strcmp(Prog.io.assignment[i].name, selName)==0)
                break;
        }
        if(i < Prog.io.count)
            return i;
    }
    // no previous, or selected was deleted
    return -1;
}

//-----------------------------------------------------------------------------
// Load the I/O list from a file. Since we are just loading pin assignments,
// put it into IoSeenPreviously so that it will get used on the next
// extraction.
//-----------------------------------------------------------------------------
BOOL LoadIoListFromFile(FILE *f)
{
    char line[80];
    char name[MAX_NAME_LEN];
    int pin;
    while(fgets(line, sizeof(line), f)) {
        if(strcmp(line, "END\n")==0) {
            return TRUE;
        }
        // Don't internationalize this! It's the file format, not UI.
        if(sscanf(line, "    %s at %d", name, &pin)==2) {
            int type;
            switch(name[0]) {
                case 'X': type = IO_TYPE_DIG_INPUT; break;
                case 'Y': type = IO_TYPE_DIG_OUTPUT; break;
                case 'A': type = IO_TYPE_READ_ADC; break;
                default: oops();
            }
            AppendIoSeenPreviously(name, type, pin);
        }
    }
    return FALSE;
}

//-----------------------------------------------------------------------------
// Write the I/O list to a file. Since everything except the pin assignment
// can be extracted from the schematic, just write the Xs and Ys.
//-----------------------------------------------------------------------------
void SaveIoListToFile(FILE *f)
{
    int i;
    for(i = 0; i < Prog.io.count; i++) {
        if(Prog.io.assignment[i].type == IO_TYPE_DIG_INPUT  ||
           Prog.io.assignment[i].type == IO_TYPE_DIG_OUTPUT ||
           Prog.io.assignment[i].type == IO_TYPE_READ_ADC)
        {
            // Don't internationalize this! It's the file format, not UI.
            fprintf(f, "    %s at %d\n", Prog.io.assignment[i].name,
                Prog.io.assignment[i].pin);
        }
    }
}

//-----------------------------------------------------------------------------
// Dialog proc for the popup that lets you set the value of an analog input for
// simulation.
//-----------------------------------------------------------------------------
static LRESULT CALLBACK AnalogSliderDialogProc(HWND hwnd, UINT msg,
    WPARAM wParam, LPARAM lParam)
{
    switch (msg) {
        case WM_CLOSE:
        case WM_DESTROY:
            AnalogSliderDone = TRUE;
            AnalogSliderCancel = TRUE;
            return 1;

        default:
            return DefWindowProc(hwnd, msg, wParam, lParam);
    }
}

//-----------------------------------------------------------------------------
// A little toolbar-style window that pops up to allow the user to set the
// simulated value of an ADC pin.
//-----------------------------------------------------------------------------
void ShowAnalogSliderPopup(char *name)
{
    WNDCLASSEX wc;
    memset(&wc, 0, sizeof(wc));
    wc.cbSize = sizeof(wc);

    wc.style            = CS_BYTEALIGNCLIENT | CS_BYTEALIGNWINDOW | CS_OWNDC |
                            CS_DBLCLKS;
    wc.lpfnWndProc      = (WNDPROC)AnalogSliderDialogProc;
    wc.hInstance        = Instance;
    wc.hbrBackground    = (HBRUSH)COLOR_BTNSHADOW;
    wc.lpszClassName    = "LDmicroAnalogSlider";
    wc.lpszMenuName     = NULL;
    wc.hCursor          = LoadCursor(NULL, IDC_ARROW);

    RegisterClassEx(&wc);

    POINT pt;
    GetCursorPos(&pt);

    SWORD currentVal = GetAdcShadow(name);

    SWORD maxVal;
    if(Prog.mcu) {
        maxVal = Prog.mcu->adcMax;
    } else {
        maxVal = 1023;
    }
    if(maxVal == 0) {
        Error(_("No ADC or ADC not supported for selected micro."));
        return;
    }

    int left = pt.x - 10;
    // try to put the slider directly under the cursor (though later we might
    // realize that that would put the popup off the screen)
    int top = pt.y - (15 + (73*currentVal)/maxVal);

    RECT r;
    SystemParametersInfo(SPI_GETWORKAREA, 0, &r, 0);

    if(top + 110 >= r.bottom) {
        top = r.bottom - 110;
    }
    if(top < 0) top = 0;
    
    AnalogSliderMain = CreateWindowClient(0, "LDmicroAnalogSlider", "I/O Pin",
        WS_VISIBLE | WS_POPUP | WS_DLGFRAME,
        left, top, 30, 100, NULL, NULL, Instance, NULL);

    AnalogSliderTrackbar = CreateWindowEx(0, TRACKBAR_CLASS, "", WS_CHILD |
        TBS_AUTOTICKS | TBS_VERT | TBS_TOOLTIPS | WS_CLIPSIBLINGS | WS_VISIBLE, 
        0, 0, 30, 100, AnalogSliderMain, NULL, Instance, NULL);
    SendMessage(AnalogSliderTrackbar, TBM_SETRANGE, FALSE,
        MAKELONG(0, maxVal));
    SendMessage(AnalogSliderTrackbar, TBM_SETTICFREQ, (maxVal + 1)/8, 0);
    SendMessage(AnalogSliderTrackbar, TBM_SETPOS, TRUE, currentVal);

    EnableWindow(MainWindow, FALSE);
    ShowWindow(AnalogSliderMain, TRUE);
    SetFocus(AnalogSliderTrackbar);

    DWORD ret;
    MSG msg;
    AnalogSliderDone = FALSE;
    AnalogSliderCancel = FALSE;

    SWORD orig = GetAdcShadow(name);

    while(!AnalogSliderDone && (ret = GetMessage(&msg, NULL, 0, 0))) {
        SWORD v = (SWORD)SendMessage(AnalogSliderTrackbar, TBM_GETPOS, 0, 0);

        if(msg.message == WM_KEYDOWN) {
            if(msg.wParam == VK_RETURN) {
                AnalogSliderDone = TRUE;
                break;
            } else if(msg.wParam == VK_ESCAPE) {
                AnalogSliderDone = TRUE;
                AnalogSliderCancel = TRUE;
                break;
            }
        } else if(msg.message == WM_LBUTTONUP) {
            if(v != orig) {
                AnalogSliderDone = TRUE;
            }
        }
        SetAdcShadow(name, v);

        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    if(!AnalogSliderCancel) {
        SWORD v = (SWORD)SendMessage(AnalogSliderTrackbar, TBM_GETPOS, 0, 0);
        SetAdcShadow(name, v);
    }

    EnableWindow(MainWindow, TRUE);
    DestroyWindow(AnalogSliderMain);
    ListView_RedrawItems(IoList, 0, Prog.io.count - 1);
}

//-----------------------------------------------------------------------------
// Window proc for the contacts dialog box
//-----------------------------------------------------------------------------
static LRESULT CALLBACK IoDialogProc(HWND hwnd, UINT msg, WPARAM wParam,
    LPARAM lParam)
{
    switch (msg) {
        case WM_COMMAND: {
            HWND h = (HWND)lParam;
            if(h == OkButton && wParam == BN_CLICKED) {
                DialogDone = TRUE;
            } else if(h == CancelButton && wParam == BN_CLICKED) {
                DialogDone = TRUE;
                DialogCancel = TRUE;
            } else if(h == PinList && HIWORD(wParam) == LBN_DBLCLK) {
                DialogDone = TRUE;
            }
            break;
        }

        case WM_CLOSE:
        case WM_DESTROY:
            DialogDone = TRUE;
            DialogCancel = TRUE;
            return 1;

        default:
            return DefWindowProc(hwnd, msg, wParam, lParam);
    }

    return 1;
}

//-----------------------------------------------------------------------------
// Create our window class; nothing exciting.
//-----------------------------------------------------------------------------
static BOOL MakeWindowClass()
{
    WNDCLASSEX wc;
    memset(&wc, 0, sizeof(wc));
    wc.cbSize = sizeof(wc);

    wc.style            = CS_BYTEALIGNCLIENT | CS_BYTEALIGNWINDOW | CS_OWNDC |
                            CS_DBLCLKS;
    wc.lpfnWndProc      = (WNDPROC)IoDialogProc;
    wc.hInstance        = Instance;
    wc.hbrBackground    = (HBRUSH)COLOR_BTNSHADOW;
    wc.lpszClassName    = "LDmicroIo";
    wc.lpszMenuName     = NULL;
    wc.hCursor          = LoadCursor(NULL, IDC_ARROW);
    wc.hIcon            = (HICON)LoadImage(Instance, MAKEINTRESOURCE(4000),
                            IMAGE_ICON, 32, 32, 0);
    wc.hIconSm          = (HICON)LoadImage(Instance, MAKEINTRESOURCE(4000),
                            IMAGE_ICON, 16, 16, 0);

    return RegisterClassEx(&wc);
}

static void MakeControls(void)
{
    HWND textLabel = CreateWindowEx(0, WC_STATIC, _("Assign:"),
        WS_CHILD | WS_CLIPSIBLINGS | WS_VISIBLE,
        6, 1, 80, 17, IoDialog, NULL, Instance, NULL);
    NiceFont(textLabel);

    PinList = CreateWindowEx(WS_EX_CLIENTEDGE, WC_LISTBOX, "",
        WS_CHILD | WS_TABSTOP | WS_CLIPSIBLINGS | WS_VISIBLE | WS_VSCROLL |
        LBS_NOTIFY, 6, 18, 95, 320, IoDialog, NULL, Instance, NULL);
    FixedFont(PinList);

    OkButton = CreateWindowEx(0, WC_BUTTON, _("OK"),
        WS_CHILD | WS_TABSTOP | WS_CLIPSIBLINGS | WS_VISIBLE | BS_DEFPUSHBUTTON,
        6, 325, 95, 23, IoDialog, NULL, Instance, NULL); 
    NiceFont(OkButton);

    CancelButton = CreateWindowEx(0, WC_BUTTON, _("Cancel"),
        WS_CHILD | WS_TABSTOP | WS_CLIPSIBLINGS | WS_VISIBLE,
        6, 356, 95, 23, IoDialog, NULL, Instance, NULL); 
    NiceFont(CancelButton);
}

void ShowIoDialog(int item)
{
    if(!Prog.mcu) {
        MessageBox(MainWindow,
            _("No microcontroller has been selected. You must select a "
            "microcontroller before you can assign I/O pins.\r\n\r\n"
            "Select a microcontroller under the Settings menu and try "
            "again."), _("I/O Pin Assignment"), MB_OK | MB_ICONWARNING);
        return;
    }

    if(Prog.mcu->whichIsa == ISA_ANSIC) {
        Error(_("Can't specify I/O assignment for ANSI C target; compile and "
            "see comments in generated source code."));
        return;
    }

    if(Prog.mcu->whichIsa == ISA_INTERPRETED) {
        Error(_("Can't specify I/O assignment for interpretable target; see "
            "comments in reference implementation of interpreter."));
        return;
    }

    if(Prog.io.assignment[item].name[0] != 'X' && 
       Prog.io.assignment[item].name[0] != 'Y' &&
       Prog.io.assignment[item].name[0] != 'A')
    {
        Error(_("Can only assign pin number to input/output pins (Xname or "
            "Yname or Aname)."));
        return;
    }

    if(Prog.io.assignment[item].name[0] == 'A' && Prog.mcu->adcCount == 0) {
        Error(_("No ADC or ADC not supported for this micro."));
        return;
    }

    if(strcmp(Prog.io.assignment[item].name+1, "new")==0) {
        Error(_("Rename I/O from default name ('%s') before assigning "
            "MCU pin."), Prog.io.assignment[item].name);
        return;
    }

    MakeWindowClass();

    // We need the TOOLWINDOW style, or else the window will be forced to
    // a minimum width greater than our current width. And without the
    // APPWINDOW style, it becomes impossible to get the window back (by
    // Alt+Tab or taskbar).
    IoDialog = CreateWindowClient(WS_EX_TOOLWINDOW | WS_EX_APPWINDOW,
        "LDmicroIo", _("I/O Pin"),
        WS_OVERLAPPED | WS_SYSMENU,
        100, 100, 107, 387, NULL, NULL, Instance, NULL);

    MakeControls();

    SendMessage(PinList, LB_ADDSTRING, 0, (LPARAM)_("(no pin)"));
    int i;
    for(i = 0; i < Prog.mcu->pinCount; i++) {
        int j;
        for(j = 0; j < Prog.io.count; j++) {
            if(j == item) continue;
            if(Prog.io.assignment[j].pin == Prog.mcu->pinInfo[i].pin) {
                goto cant_use_this_io;
            }
        }

        if(UartFunctionUsed() && Prog.mcu &&
                ((Prog.mcu->pinInfo[i].pin == Prog.mcu->uartNeeds.rxPin) ||
                 (Prog.mcu->pinInfo[i].pin == Prog.mcu->uartNeeds.txPin)))
        {
            goto cant_use_this_io;
        }

        if(PwmFunctionUsed() && 
            Prog.mcu->pinInfo[i].pin == Prog.mcu->pwmNeedsPin)
        {
            goto cant_use_this_io;
        }

        if(Prog.io.assignment[item].name[0] == 'A') {
            for(j = 0; j < Prog.mcu->adcCount; j++) {
                if(Prog.mcu->adcInfo[j].pin == Prog.mcu->pinInfo[i].pin) {
                    // okay; we know how to connect it up to the ADC
                    break;
                }
            }
            if(j == Prog.mcu->adcCount) {
                goto cant_use_this_io;
            }
        }

        char buf[40];
        if(Prog.mcu->pinCount <= 21) {
            sprintf(buf, "%3d   %c%c%d", Prog.mcu->pinInfo[i].pin,
                Prog.mcu->portPrefix, Prog.mcu->pinInfo[i].port,
                Prog.mcu->pinInfo[i].bit);
        } else {
            sprintf(buf, "%3d  %c%c%d", Prog.mcu->pinInfo[i].pin,
                Prog.mcu->portPrefix, Prog.mcu->pinInfo[i].port,
                Prog.mcu->pinInfo[i].bit);
        }
        SendMessage(PinList, LB_ADDSTRING, 0, (LPARAM)buf);
cant_use_this_io:;
    }

    EnableWindow(MainWindow, FALSE);
    ShowWindow(IoDialog, TRUE);
    SetFocus(PinList);

    MSG msg;
    DWORD ret;
    DialogDone = FALSE;
    DialogCancel = FALSE;
    while((ret = GetMessage(&msg, NULL, 0, 0)) && !DialogDone) {
        if(msg.message == WM_KEYDOWN) {
            if(msg.wParam == VK_RETURN) {
                DialogDone = TRUE;
                break;
            } else if(msg.wParam == VK_ESCAPE) {
                DialogDone = TRUE;
                DialogCancel = TRUE;
                break;
            }
        }

        if(IsDialogMessage(IoDialog, &msg)) continue;
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    if(!DialogCancel) {
        int sel = SendMessage(PinList, LB_GETCURSEL, 0, 0);
        char pin[16];
        SendMessage(PinList, LB_GETTEXT, (WPARAM)sel, (LPARAM)pin);
        if(strcmp(pin, _("(no pin)"))==0) {
            int i;
            for(i = 0; i < IoSeenPreviouslyCount; i++) {
                if(strcmp(IoSeenPreviously[i].name,
                    Prog.io.assignment[item].name)==0)
                {
                    IoSeenPreviously[i].pin = NO_PIN_ASSIGNED;
                }
            }
            Prog.io.assignment[item].pin = NO_PIN_ASSIGNED;
        } else {
            Prog.io.assignment[item].pin = atoi(pin);
            // Only one name can be bound to each pin; make sure that there's
            // not another entry for this pin in the IoSeenPreviously list,
            // that might get used if the user creates a new pin with that
            // name.
            int i;
            for(i = 0; i < IoSeenPreviouslyCount; i++) {
                if(IoSeenPreviously[i].pin == atoi(pin)) {
                    IoSeenPreviously[i].pin = NO_PIN_ASSIGNED;
                }
            }
        }
    }

    EnableWindow(MainWindow, TRUE);
    DestroyWindow(IoDialog);
    return;
}

//-----------------------------------------------------------------------------
// Called in response to a notify for the listview. Handles click, text-edit
// operations etc., but also gets called to find out what text to display
// where (LPSTR_TEXTCALLBACK); that way we don't have two parallel copies of
// the I/O list to keep in sync.
//-----------------------------------------------------------------------------
void IoListProc(NMHDR *h)
{
    switch(h->code) {
        case LVN_GETDISPINFO: {
            NMLVDISPINFO *i = (NMLVDISPINFO *)h;
            int item = i->item.iItem;
            switch(i->item.iSubItem) {
                case LV_IO_PIN:
                    // Don't confuse people by displaying bogus pin assignments
                    // for the C target.
                    if(Prog.mcu && (Prog.mcu->whichIsa == ISA_ANSIC ||
                                    Prog.mcu->whichIsa == ISA_INTERPRETED) )
                    {
                        strcpy(i->item.pszText, "");
                        break;
                    }

                    PinNumberForIo(i->item.pszText,
                        &(Prog.io.assignment[item]));
                    break;

                case LV_IO_TYPE: {
                    char *s = IoTypeToString(Prog.io.assignment[item].type);
                    strcpy(i->item.pszText, s);
                    break;
                }
                case LV_IO_NAME:
                    strcpy(i->item.pszText, Prog.io.assignment[item].name);
                    break;

                case LV_IO_PORT: {
                    // Don't confuse people by displaying bogus pin assignments
                    // for the C target.
                    if(Prog.mcu && Prog.mcu->whichIsa == ISA_ANSIC) {
                        strcpy(i->item.pszText, "");
                        break;
                    }

                    int type = Prog.io.assignment[item].type;
                    if(type != IO_TYPE_DIG_INPUT && type != IO_TYPE_DIG_OUTPUT
                        && type != IO_TYPE_READ_ADC)
                    {
                        strcpy(i->item.pszText, "");
                        break;
                    }

                    int pin = Prog.io.assignment[item].pin;
                    if(pin == NO_PIN_ASSIGNED || !Prog.mcu) {
                        strcpy(i->item.pszText, "");
                        break;
                    }

                    if(UartFunctionUsed() && Prog.mcu) {
                        if((Prog.mcu->uartNeeds.rxPin == pin) ||
                           (Prog.mcu->uartNeeds.txPin == pin))
                        {
                            strcpy(i->item.pszText, _("<UART needs!>"));
                            break;
                        }
                    }

                    if(PwmFunctionUsed() && Prog.mcu) {
                        if(Prog.mcu->pwmNeedsPin == pin) {
                            strcpy(i->item.pszText, _("<PWM needs!>"));
                            break;
                        }
                    }

                    int j;
                    for(j = 0; j < Prog.mcu->pinCount; j++) {
                        if(Prog.mcu->pinInfo[j].pin == pin) {
                            sprintf(i->item.pszText, "%c%c%d",
                                Prog.mcu->portPrefix,
                                Prog.mcu->pinInfo[j].port,
                                Prog.mcu->pinInfo[j].bit);
                            break;
                        }
                    }
                    if(j == Prog.mcu->pinCount) {
                        sprintf(i->item.pszText, _("<not an I/O!>"));
                    }
                    break;
                }

                case LV_IO_STATE: {
                    if(InSimulationMode) {
                        char *name = Prog.io.assignment[item].name;
                        DescribeForIoList(name, i->item.pszText);
                    } else {
                        strcpy(i->item.pszText, "");
                    }
                    break;
                }

            }
            break;
        }
        case LVN_ITEMACTIVATE: {
            NMITEMACTIVATE *i = (NMITEMACTIVATE *)h;
            if(InSimulationMode) {
                char *name = Prog.io.assignment[i->iItem].name;
                if(name[0] == 'X') {
                    SimulationToggleContact(name);
                } else if(name[0] == 'A') {
                    ShowAnalogSliderPopup(name);
                }
            } else {
                UndoRemember();
                ShowIoDialog(i->iItem);
                ProgramChanged();
                InvalidateRect(MainWindow, NULL, FALSE);
            }
            break;
        }
    }
}