Greetings to all readers! I have a nice problem and I am happy for all your answers. Preliminary: I tried to send data from my atmega8 to HTerm 0.8.1 beta but it received only \0\0\0... Hence, I concentrated on the simulation in AtmelStudio6: The code I used is visible on http://www.mikrocontroller.net/articles/AVR-Tutorial:_UART under "Senden von Zeichen" and in the attachment. Symptoms in the Simulator of AtmelStudio6: When debugging I observed some effects that are hopefully interrelated: - URSEL stays at 0. - No changes can be observed in UDR. - UDRE wont come back to 1...not after 1200 steps. - TXC stays at 0, too. - Only two loop-cycles ('T' and 'e') are run through, then UDRE is set to 0...and the program wont exit the serout-sub-routine. I read the fantastic mannual and browsed the forum but couldn´t find a hint to make the uart work. Thank you for your comments and ideas! Best regards max
I found an answer to the UDR and the TXC "problem" and probably also for the URSEL "problem" in the Atmel Studio6 Manual: "In some cases, read and write access go to different hardware locations. The effect ot this may be that attempting to change a register/bitfield has no visible effect even if the register is actually written (like the USART UDR register in many devices), or that the effect is delayed by one or more cycles (like registers with double buffering)" ...to be continued...
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