![]() ![]() If you had CTS/RTS shorted in loopback, then remove that as well. Remove the TX/RX jumper in loopback without changing software or shutdown/reboot.Exit gtkterm (do not reboot or reset anything). Settings were verified set and correct with gtkterm.I don’t normally recommend disconnecting/connecting UART lines on a running system, but if nothing odd is going on you could do the following to transition to the remote device: Now if you were to tie the CTS and RTS together as well, and instead start the command line with CTS/RTS flow control, then echo of text during typing would show the driver and hardware on that side are working correctly in that mode. When TX and RX are shorted, if you run gtkterm as mentioned, then typing text in should result in the text being echoed back. This is just a wiring test (not meant to be a permanent solution). “man stty” will show a lot of options, but not all UARTs support all options (even if the driver doesn’t complain). Using a hyphen (“-crtscts”) in front implies “no” flow control. To set 115200 but only one stop bit us a hyphen on cstopbit: Here are some example stty manipulations (adjust ofr your case): To read a port: When you query for a serial UART setting what you are getting is the driver’s settings…if the driver was set to something the UART doesn’t accept, then you will never know from a simple driver query. There are other ways as well, but UARTs are not plug-n-play…they have no ability (for the most part) to be queried. Note that the lack of option “-w” implies disabling hardware flow control. ![]() I’d wire the RX and TX together (optionally CTS and RTS), add gtkterm (“sudo apt-get install gtkterm”), and run this as root or a user with permissions: gtkterm -b 8 -t 1 -s 9600 -p /dev/ttyTHS1 I have not tested doing this with direct UART manipulation, but a very reliable way to do this (at least while testing) is to use loopback with gtkterm or another serial terminal. I followed these steps Instructables Burn a New Bootloader - Arduino Pro Miniīurn a New Bootloader - Arduino Pro Mini: I wanted to re-purpose an Arduino Pro Mini that I hadn't used for a while, so - as I do with all the Arduinos I re-use - I tried to upload the Blink sketch to return it to a sort of 'default' state and to. When we got our Atmega328p it needed a bootloader, so I used an Arduino to burn the bootloader in it. We do the same steps, press upload, press the reset button but it does not work. However, we just cannot upload the sketch without the dongle. This shows that UART communication (without the dongle) between our custom board that has the Atmega328P and through the connector to the TX2 module is working. The Tx and Rx lines works, since without the dongle I can read and write bytes using the Arduino serial monitor. When we try to upload a sketch without the dongle, we get this errorĪvrdude: arduino_read_sig_bytes(): (a) protocol error, expect=0x10, resp=0x0eĪvrdude: error reading signature data for part “ATMEGA328P”, rc=-3Īvrdude: error reading signature data, rc=-3Īvrdude: stk500_disable(): protocol error, expect 0x14 resp=0x00 If we connect a USB dongle to the Rx and Tx lines on our custom board to the TX2 carrier board setup, we can successfully upload the sketch.īut we expect that we do not need to use a dongle, since the Rx and Tx signal lines from the Atmega328P on our custom board goes directly to the TX2 module via a connector. ![]() ![]() The Rx and Tx lines goes directly to TX2 but through a 5V 1.8V level shifter and we downloaded the Arduino IDE on Ubuntu. This board is connected to a TX2 module setup. I am having issues uploading a sketch to my ATmega328P chip which is on a custom board identical to the Arduino Mini Pro. ![]()
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