Dear all,
we are developing a control panel based on STM32F767 microcontroller. In our board we have a QSPI flash memory to store the resources, menu Structure and menu Strings. We placed the menu Structure and menu String at specif addresses, so it is possible to replace or upgrade the menu when necessary (using a the bootloader).
We realized a tool that generate the strings coded on Unicode characters. In this control panel we realized programmatically menu, so when the user hits a button, our function provides the rows count and the strings for each rows of the menu. This is the ShowMenu method implemented in Embedded Wizard Studio:
method void ShowMenu( arg int32 MenuLevel, arg int32 MenuId )
{
tmrOnExit.Enabled = false;
sthClose.Enabled = false;
//to avoid warning
MenuLevel;
MenuId;
if ( MenuView.GetCurrentMenu() != null )
{
trace "There is already a menu visible.";
return;
}
RectEffect.Reversed = false;
RectEffect.Enabled = true;
//necessary to place on top MenuView since Menu Button are created dinamically
RestackTop( MenuView );
var Menu::Menu menu = new Menu::Menu;
//var Menu::ExitItem item4 = new Menu::ExitItem;
$if $prototyper == true
var Menu::BigSlideItem item1 = new Menu::BigSlideItem;
var Menu::BigSlideItem item2 = new Menu::BigSlideItem;
var Menu::BigSlideItem item3 = new Menu::BigSlideItem;
menu.Caption = "Test";
item1.Caption = "Caption 1";
item2.Caption = "Caption 2";
item3.Caption = "Caption 3";
//item4.Caption = "EXIT";
menu.AppendItem( item1 );
menu.AppendItem( item2 );
menu.AppendItem( item3 );
//menu2.AppendItem( item4 );
$else
//get the current menu
var int32 listItem = 0;
var int32 i;
var string RowCaption = "";
native (MenuLevel, listItem) {
Start_menu(MenuLevel);
listItem = GetMenuCurrentListCount();
}
for (i = 0; i < listItem; i = i + 1)
{
native (RowCaption, i)
{
RowCaption = GetMenuStringByListOrdinal(i);
}
//test
//RowCaption = "Test";
if (i == 0)
{
//first caption is menu caption
menu.Caption = RowCaption;
}
else
{
var Menu::BigSlideItem item1 = new Menu::BigSlideItem;
item1.Caption = RowCaption;
menu.AppendItem( item1 );
}
}
$endif
MenuView.exitMenu = sltCloseMenu;
MenuView.OpenMenu( menu );
}
The Ansi C function GetMenuStringByListOrdinal(i) is our function that provides a XString type (retrieve the memory address of Unicode string)... When the code is runnig and excute the menu.Caption = RowCaption instuction, the target fall in EwPanic function...
More specifically, the previous instruction has translated in MenuMenu_OnSetCaption( menu, RowCaption ) on the target device and this function is like this:
/* 'C' function for method : 'Menu::Menu.OnSetCaption()' */
void MenuMenu_OnSetCaption( MenuMenu _this, XString value )
{
if ( !EwCompString( _this->Caption, value ))
return;
EwRetainString( &_this->Caption, value );
EwNotifyObjObservers((XObject)_this, 0 );
}
So when the code call EwRetainString fall in EwPanic... If we set RowCaption = "Test" in the Embedded Wizard Studio everything works perfectly.
We understand that if we use a memory address of constant string array created by Emebedded Wizard studio everythings works perfectly, otherwise no.
We use a debug serial port to read all the GUI message. The error before panic is as follow:
[FATAL ERROR in ewstring.c:1300] Unmanaged string 'Combustion Management'
PANIC: System halted
Could you help us please?
Waiting for your kind reply
Best regards
Gianni Perugini
