[avr-gcc-list] Is this a Stack problem?

[Eric Fu]

Hi All,

I'm writing a test code to implement a SW half duplex interrupt UART with 
ATmega16 / STK500.
The code passes the compiler (modified from a successful HW UART code). 
However, it doesn't work. It couldn't transmit anything, nothing happens at the 
transmit pin. The degugging I did shows the following:
  a.. The timer interrupt routine has been entered 22 times before it stops. 
And it is repeatable. Note: the timer period is defined same as bit rate. It 
supposed to transmit 11 ASCII code, equivalent to 220 timer interrupt entries.
  b.. If I run the Simulator in AVR Studio 4.08 in step mode, it could transmit 
the all the 11 characters, at least this is what I saw in the Simulator, and 
the transmit pin behaves as expected (in the Simulator)
  c.. If I run in continuos mode with a breakpoint set immediately after the 11 
characters, it took 28 Secs to complete, however, it seems it does it 
connectedly.
As I don't have a emulator at the moment, it is hard for me to find the fault. 

Could it be Stack problem? If it is, how to fix it?
The compile message for code size is

Size after:
RF001.elf  :
section     size      addr
.text       1622         0
.data         12   8388704
.bss         137   8388716
.noinit        0   8388853
.eeprom        0   8454144
.stab       7212         0
.stabstr    3158         0
Total      12141

I'm not sure what stab and stabstr are. Are they supposed to be like that?

Thanks 

Eric Fu