HELP!! I have a ATmega128RFA1 via UART-USB connected to the PC and just want to check the correct transmission of data via the UART. I try to read the microcontroller with Terminal-Program HTerm on my PC configured this way: Baud:9600, data:8, stop:1, Parity:None, after try all I can not. I have the ATmega128RFA1 microcontroller programmed with code enclosed. Does someone could help me, please?, I don´t know what I'm doing wrong. Thanks in advanced.
I'm not profitient in c. But at least You should try char str[]= "Hello world\0"; HTH
You should set the UBRR0 Register BEFORE you Enable RX and TX. anyone wrote: > I'm not profitient in c. But at least You should try > > char str[]= "Hello world\0"; This is not necessary because the quotation marks already define a 0-Termitated string in C. The \0 is appended automatically. So char str[] = "1234" is 5 bytes long 0x31,0x32,0x33,0x34,0x00.
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I have already try what you say but i can´t. How should I configure Hterm terminal program?I enclose the screen of my Hterm. I think now the code is correct, or should I add any printf? Thanks.
ektor wrote: > I have a ATmega128RFA1 via UART-USB connected to the PC Do you have a USB=> RS232 (with RS232 voltage levels) or a USB => UART (TTL) converter. You can't connect the Atmega UART to the RS232 directly since it has different voltage levels. Then you need a Level Converter IC like MAX232 or Max3232. And of cause you should check the right connection of Tx(AVR)=>Rx(PC) and vice versa
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Beside wiring issues, a common point for UART failures are fuse -, clock settings and the choice of F_CPU. Also check if hardware flow control is disabled in the terminal program. Debug Hint: Write a endless loop in a test programm that transmits permanent, e.g. letter "A" and then configure the terminal until you see the "A".
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Timmo H. wrote: > Do you have a USB=> RS232 (with RS232 voltage levels) or a USB => UART > (TTL) converter. I am using USB-UART TTL converter. This one: (https://shop.dresden-elektronik.de/accessories-1/levelshifter/usb-pegelwandler-stick-low-power.html). A. W. wrote: > Beside wiring issues, a common point for UART failures are fuse -, > clock settings and the choice of F_CPU. I think all the fuses are correctly.(see screen enclosed). > Also check if hardware flow control is disabled in the terminal program. The flow control is disabled. > > Debug Hint: Write a endless loop in a test programm that transmits > permanent, e.g. letter "A" and then configure the terminal until you see > the "A". Would be correct an example like the c example that I enclose?
And you're sure that you connected Pin1 of the Converter to Pin 47 and Pin4 of the Converter to Pin 46 of the Atmega? And of cause the ground (Pin6) to your target board GND?
The link to the USB converter is broken. What hardware do you use at all (e.g. which RFA1 PCB, a comercial one or a home-brew)?
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I don't have the RFA1. But as USB => UART TTL Converter this one works great: http://www.ebay.de/itm/400414654693
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Hello! I have the ATmega128RFA1 coneccted to the PC with the USB-UART TTL converter like I said(https://shop.dresden-elektronik.de/accessories-1/levelshifter/usb-pegelwandler-stick-low-power.html) and it should work correctly because all pins and conecction are correctly connected because I am using a board(I enclose a picture), but I am sure that I am doing something bad in the programation or the Hterm configuration. In the Hterm CW-Keyer that I enclose we can read that I need to install Prerequisites Before inserting the CWKeyer the first time in your PC must be installed the appropriate drivers (if you have not done so as well). The chip used is a by FTDI FT232. There are drivers for Windows, Linux and Mac here: http:\\\/\\\/www. ftdichip. com\\\/Drivers\\\/VCP. htm after installation the manipulator can be inserted. Now this must login as "eHaJo CWKeyer". Should I do? How can I get read the ATmega128RFA1 with Hterm?:C Help¡¡ Thanks in advance.
If your USB TTL converter is based on a FTDI Chip, of cause you have to install the drivers first (from here http://www.dresden-elektronik.de/funktechnik/service/downloads/software/?L=0 or http://www.ftdichip.com/Drivers/VCP.htm ) After you did that you plug in your USB UART Converter and a virtual COM-Port should appear in the device manager like here: http://www.ladyada.net/images/arduino/devicemanager.jpg Behind the name you see the assigned COM-Port number (e.g. COM12). In hterm you connect to this COM-Port with the baudrate and configuration you also set in your atmega such as 9600 8N1. Thats it.
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Thank you very much, I did it time ago because of that i answer about CWkeyer. My code and my configuration is like i showed but it is impossible to read by Hterm. The C code that I enclose is correct? Whith this code should I read anithing on HTerm or shud I modify anything? How have I to configure the HTerm? I just configure Baud:9600, data:8, stop:1, Parity:None
Until now you didn't answered my question Timmo H. wrote: > And you're sure that you connected Pin1 of the Converter to Pin 47 and > Pin4 of the Converter to Pin 46 of the Atmega? And of cause the ground > (Pin6) to your target board GND? Are you sure you checked the right connection?! ektor wrote: > The C code that I enclose is correct? Now your code has changed since you last post. To use "printf" you have to do a little bit more: http://www.mikrocontroller.net/articles/AVR-GCC-Tutorial#Die_Nutzung_von_sprintf_und_printf But you can use your sendestring function which seems to be correct. And you really should set the UBRR0 BEFORE you enable the tx and rx as I said before.
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Hello¡¡ Timmo H. wrote: > Until now you didn't answered my question Sorry, I thought that with the picture was ok, I think all is correctly connected because it already design by deRFbreakout Board for pluggable radio modules(http://www.dresden-elektronik.de/funktechnik/products/boards-and-kits/development-boards/derfbreakout-board/description/?L=1). In this case Pin1 of the Converter to Pin 28 and Pin4 of the Converter to Pin 26 of the deRFbreakout Board.GND is aswell good coneccted. I enclose a picture of the conections and the deRFbreakout Board Datasheet. I have checked all and I think is ok. My conponents are conected like i show you in the picture 222. > But you can use your sendestring function which seems to be correct. So If have the deRFmega128 programmed whit the first C code with the sendestring what should I do for get read anything in Hterm? Should I write anything for get data, or just should I be able to read without write? I have tried all.:C Thank you!!
Thank you for help but unfortunately I can not read data from ATmega128RFA1. Whith the code that now I enclose, should I able to see a Hello World just connecting with Hterm? Help¡¡
If you remove the while(1) endless loop, the string will be displayed again and again. If you are the originator of this thread Beitrag "Verknüpfung der Sensordatenabfrage(LTC2498) mit der Funkverbindung(ATmega128RFA1)", please avoid double postings, lets stay at one thread and solve the issues step by step.
Hello, I am sorry!! Now I can read the messege on my Hterm¡¡ Thank you very much!!
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