Atmega <> USO BASCOM issue

Hi,

I'm trying to read data from USO with an uC. But the uC won't read anything. I'm using BASCOM and I tried several codes. If the uC recieves any data, the LED on pinb.1 should toggle. It's working fine with hyperterminal, but not with X-Sim.

USO string I'm using is just ~115~ (ASCII S). So USO should send 01010011 every 33ms to my uC and toggle the LED.

Code:

$regfile = m88def.dat
$crystal = 8000000
$baud = 19200

Config Serialin = Buffered , Size = 20
Config Pinb.1 = Output
Led Alias Portb.1

Dim A As Byte

Enable Interrupts

Do
A = Inkey()
If A <> 0 Then
Toggle Led
End If
Loop
End

Would be great if anone could help

I don't know bascom, and I really have no clue what your compiler does with those instructions.
I can help you out if it was AVR Studio.

If it works with hyperterminal, it should work with x-sim too. What frequency and baudrate are you using?

BTW, '01010011' is 83. 115 is '01110011'

Baud is 19200/8/N/1

I've tried INKEY, WAITKEY and INPUT. Nothing works...

Try to lower the baud rate and see if that helps. Other than that, the only advice I can give you is to ask in a related forum, preferably a BASCOM forum. Or you can get AVR Studio with the WinAVR compiler library.

WinAVR would mean C. I'm not firm with C or Assembler.

I'll try it with lower baud rate.

Thanks, will check it.

I will also try Ischarwaiting, Interrupt recieve and with an external crystal. Atm just the internal RC is active. This may cause this problem, too.

The internal oscillator will definietly cause problems. It is nowhere near stable enough for the baudrate you are trying to use.

I Think, I got it.

Every time USO (X-Sim) starts up and connects to my uC, it sends:

Code:

COM port is opened
<20100218000422.102 SYS>
Baud rate 19200
<20100218000422.105 SYS>
RTS off
<20100218000422.108 SYS>
DTR on
<20100218000422.111 SYS>
Data bits=8, Stop bits=1, Parity=None
<20100218000422.111 SYS>
Set chars: Eof=0x00, Error=0x00, Break=0x00, Event=0x00, Xon=0x11, Xoff=0x13
<20100218000422.114 SYS>
Handflow: ControlHandShake=(DTR_CONTROL), FlowReplace=(), XonLimit=2048, XoffLimit=512
<20100218000422.114 SYS>
Set timeouts: ReadInterval=50, ReadTotalTimeoutMultiplier=10, ReadTotalTimeoutConstant=50, WriteTotalTimeoutMultiplier=0, WriteTotalTimeoutConstant=0

DTR on is the problem. It resets the uC all the time because the DTR pin of the FT232RL is connected to RESET. My other test board still needs some soldering. But I guess it should be ready this weekend.

What kind of dev board are u using? Can you just disconnect that pin from the circuit? All you really need is TX and RX.

Its a SMD TQFP32 Atmega88 board + FT232RL. The RESET pin has a pull down (4k7) and is also connected to FT232 DTR. I won't damage the PCB by cutting the connection.

My DIY board without DTR connection is nearly done.

Alright, its working brilliant without DTR.