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| Problems with Carambola 2 MODULE starting up https://www.8devices.com/community/viewtopic.php?f=13&t=576 |
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| Author: | fenyvesi [ 14 Sep 2013, 03:07 ] |
| Post subject: | Problems with Carambola 2 MODULE starting up |
| Author: | gedass [ 14 Sep 2013, 09:48 ] |
| Post subject: | Re: Problems with Carambola 2 MODULE starting up |
Hi, do you have this issue with all 7 modules ? |
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| Author: | gedass [ 14 Sep 2013, 10:08 ] |
| Post subject: | Re: Problems with Carambola 2 MODULE starting up |
GPIO11 and RST can be left unconnected I connected only TX, RX, Grounds, 3v3 and pull-ups on RST (Pin33) and GPIO11 based on the schematics of dev-board. The module starts up, seems to not react to serial input, the serial console is the following: |
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| Author: | fenyvesi [ 14 Sep 2013, 10:21 ] |
| Post subject: | Re: Problems with Carambola 2 MODULE starting up |
1. First I tried unconnected GPIO11 and RST without pull-ups. The result had been the same that's why I connected the pull-ups by the dev-borad schematics. 2. I tried a 2nd C2 with Gnd, 3V3, TX, RX no pull-ups and the result is the same. Any idea? |
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| Author: | gedass [ 14 Sep 2013, 10:25 ] |
| Post subject: | Re: Problems with Carambola 2 MODULE starting up |
| Author: | gedass [ 14 Sep 2013, 10:34 ] |
| Post subject: | Re: Problems with Carambola 2 MODULE starting up |
If you use 3.3V or 5V serial port adapter TX pin must be connected via 2x resistor divider because Carambola2 serial port voltage is 2.5V |
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| Author: | fenyvesi [ 14 Sep 2013, 12:31 ] |
| Post subject: | Re: Problems with Carambola 2 MODULE starting up |
Thanks for the advice. I used a Sparkfun FTDI USB/serial converter as power source, also. I will try with independent 3V3 power. The 2.6V serial is interesting. I haven't seen it in the documentation. Anyway, I will try. Thank you. George |
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| Author: | fenyvesi [ 14 Sep 2013, 14:59 ] |
| Post subject: | Re: Problems with Carambola 2 MODULE starting up |
You were right, it was a power problem, it starts now perfectly. By the way, what is the minimal amperage that is needed? George |
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| Author: | gedass [ 14 Sep 2013, 15:33 ] |
| Post subject: | Re: Problems with Carambola 2 MODULE starting up |
http://jeelabs.org/2013/05/07/carambola ... nsumption/ |
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| Author: | crashprone [ 19 Jul 2017, 11:08 ] | ||
| Post subject: | Re: Problems with Carambola 2 MODULE starting up | ||
Hello, I seem to having a similar issue. Carambola2 boots up but fails at the DRAM: 64MB, Flash : 16MB, Net: ... stage. Would this again be a power supply issue or could it also have something to do with the state of the bootstrap pins? Thanks in advance!
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