Pages: [1]   Go Down
Author Topic: EVAL232R uno upload issues  (Read 1190 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Sr. Member
****
Karma: 1
Posts: 486
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

i just got a new computer which doesnt have regular serial ports, but i did get a free EVAL232R that out puts TX/RX etc signals in ttl format from USB. so i hooked it up and installed the drivers, but it wont upload anything, of course. TXD of the eval is going to RX on the arduino and RXD is going to TX. previously this arduino was using a MAX232 and the serial cable and worked fine. It is a breadboard duino with the optiboot(UNO) bootloader on a 328p. so then i connected RX and TX of the EVAL together and i got the echo.  so im guessing it something to do with serial port settings in device manager; mine are 9600 8N1. i changed it to 115200(the uno upload speed) but no go.

oh, and when it doesnt upload it says 0x00. so it seems like no connection at all. swapping rx/tx doesnt help. neither does manual reset.

what do ya think? sorry to post this, but i have tried all the common causes and i have run out of ideas.
Logged

http://dduino.blogspot.com all my Arduino/electronic projects!!!

{NEW} Getting Started, Learning, Reference + FAQ PDF!!:
[url]http://ar

Offline Offline
Sr. Member
****
Karma: 1
Posts: 486
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

fixed it. apparently i miss read because it gives out the regular RS232 voltages. it has the FT232RL chip to go from USB->TTL levels and then a CMOS chip to convert those ttl levels to regualt RS232 voltages. so i just connected my MAX232 back to it and got ttl levels.

i may find the traces and solder some headers directly from the ttl tx/rx/dtr pins for later use as it would much easier to use.
Logged

http://dduino.blogspot.com all my Arduino/electronic projects!!!

{NEW} Getting Started, Learning, Reference + FAQ PDF!!:
[url]http://ar

Offline Offline
Sr. Member
****
Karma: 1
Posts: 486
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

another issue smiley-wink

this time im using a USBasp as usb->ttl converter http://ullihome.de/wiki/USBAVRLab/Firmwares/USBasp . yes  they are ttl voltages as the DMM says 4.56v when measuring on GND and TXD. it passes the loop back test and i still get 0x00 error (no connection at all) when uploading...

 i am using the manual method to reset it on upload but ive done it plenty of time  before on another arduino.
Logged

http://dduino.blogspot.com all my Arduino/electronic projects!!!

{NEW} Getting Started, Learning, Reference + FAQ PDF!!:
[url]http://ar

Pages: [1]   Go Up
Jump to: