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static void update_gpios() {
    updating_gpios = true;
    while(GetMenuItemCount(gpio_menu)) {
        RemoveMenu(gpio_menu,0,MF_BYPOSITION); 
    }
    wchar_t name[256];
    for(size_t i = 0; i < 256; ++i) {
        gpio_t& g = gpios[i];
        if(g.mode!=0) {
            wcscpy(name,L"GPIO ");
            _itow((int)i,name+wcslen(name),10);
            switch(g.mode) {
                case INPUT:
                case INPUT_PULLDOWN:
                case INPUT_PULLUP:
                    wcscat(name,L" <");
                    break;
                case OUTPUT:
                case OUTPUT_OPEN_DRAIN:
                    wcscat(name,L" >");
            }
            MENUITEMINFOW mif;
            mif.cbSize = sizeof(MENUITEMINFOW);
            mif.cch = wcslen(name);
            mif.dwTypeData = name;
            mif.fMask = MIIM_STRING | MIIM_ID | MIIM_STATE;
            mif.wID = (~i);
            mif.fState = g.value==0?MFS_UNCHECKED:MFS_CHECKED;
            InsertMenuItemW(gpio_menu,GetMenuItemCount(gpio_menu),TRUE,&mif);
        }
        if(g.hwnd_text!=NULL) {
                // update the visible text box
                wchar_t val[64];
                if(!g.is_input()) {
                if(g.value==HIGH) {
                    wcscpy(val,L"HIGH");
                } else if(g.value==LOW) {
                    wcscpy(val,L"LOW");
                } else {
                    _itow(g.value,val,10);
                }
                if(GetFocus()!=g.hwnd_text) {
                    SetWindowTextW(g.hwnd_text, val);
                }
            }
            EnableWindow(g.hwnd_text,g.is_input()?TRUE:FALSE);
        }
    }
    updating_gpios = false;   
}