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| 09:05.32 | Ryp | hi ! does anyone here use his cubie for reading data on gpio ? |
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| 09:28.18 | Ryp | i'm trying to connect an wiegand RFID reader on my board but the interrupt speed seems too slow |
| 09:33.02 | premoboss | Ryp, did you tru to use the UART (one of) of the CB? |
| 09:35.43 | Ryp | premoboss: not at all, I used simple gpios (ph15 and ph14) and listened to IRQ |
| 09:36.20 | Ryp | is UART compatible with a Wiegand protocol ? |
| 09:36.35 | premoboss | i dont know, i dont know the module you talk about. |
| 09:37.12 | premoboss | it is enouugh to read/force the status of sime pins in sequece ot it is necessary to respect a protocol? (SPI, i2c, etc) |
| 09:38.31 | Ryp | I could read at a certain rate on the pins, but i'm not sure if the reading will be reliable that way |
| 09:39.21 | Ryp | the wiegand protocol use two wires (Data+ and -) and send short impulses on them |
| 09:39.39 | Ryp | in my case the communication is unidirectionnal |
| 09:40.46 | Ryp | I read what the card reader feeds me. I'm supposed to get around 26bits of data |
| 09:41.36 | Ryp | I'm not very used to SPI / UART or other low level protocols, could the UART help me achieve this you think ? |
| 09:44.11 | premoboss | Ryp, i cannot answr you cos i dont know the protocol needed bywiegand. if you know the sequence of impulses, you can do it manually writind the sequnece of "pin_up", "pin_down" of the two wires. |
| 09:45.12 | Ryp | the impulses are sent by the reader |
| 09:45.41 | Ryp | there is not much of a protocol, the reader just sends small bursts of data when it reads on a RFID card |
| 09:45.46 | premoboss | Ryp, so the CB must hear? not send impulse? |
| 09:45.55 | premoboss | ok i understand now. |
| 09:46.11 | premoboss | so you must set CB as "listender" on trend of impulse. |
| 09:46.28 | Ryp | premoboss: exactly |
| 09:46.32 | premoboss | ok |
| 09:46.56 | premoboss | what are thye speed of impulse? i mean, ine impulse every (i.e.) 10ms? |
| 09:47.50 | premoboss | there is a clock that detemine the speed (as SPI) or there is a fixed speed (as UART)? |
| 09:48.20 | Ryp | every 2ms between falling edges |
| 09:48.21 | Ryp | http://en.wikipedia.org/wiki/Wiegand_interface#Physical_layer |
| 09:49.02 | Ryp | there is no clock sync between the two ends |
| 09:50.17 | premoboss | sso you have to champion the logica leve elvery 2ms. an option is to set an interrupt to do thyat. |
| 09:50.27 | Ryp | but; my reader is supposed to keep a 500bits/sec rate |
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| 09:51.44 | premoboss | no problem, 500 b/s is a veri low speed, you can do both with interupt or simply doind a continuois polling of the pin. |
| 09:52.36 | premoboss | read the ping every 1ms so you are sure to ear all. after that, you can read the sequence of 0-1 value and "rebuild" the string. |
| 09:53.27 | Ryp | the code I used works very well with a raspberry using the same wiring |
| 09:54.27 | Ryp | I don't get why i get garbage readings ( 5-6 bits only ) |
| 09:54.42 | premoboss | Ryp, are you suse you set the GPIO correctly? to try that, force the pi to 0 or to 1 (do a short to GRD or to 3V3. aftet that, reaad the value and verify it is correct. |
| 09:54.51 | premoboss | suse=sure |
| 09:56.05 | Ryp | I did that test already |
| 09:56.17 | Ryp | because I also wired a button |
| 09:56.56 | Ryp | maybe its a difference in the internal resistor or default pull-up-down behavior between pi and cubie ? |
| 09:57.36 | Ryp | (I wish i could get an oscilloscope) |
| 09:58.21 | premoboss | both of them works in 0-3V3. what are the levoe of the module? |
| 09:59.01 | Ryp | +5V (i used a simple voltage divider with 10k - 20k resistor) |
| 09:59.26 | Ryp | https://github.com/islog/leosac/wiki/Basic-Setup#3-wiring |
| 10:00.52 | premoboss | ok |
| 10:01.21 | premoboss | at this point i ave no idea more... |
| 10:05.48 | Ryp | with my voltage divider i get a 2.5V in input |
| 10:06.00 | Ryp | is it sufficient ? |
| 10:06.23 | premoboss | bettter to reach at least 3V. |
| 10:06.50 | Ryp | ok i'll modify resistor value |
| 10:07.06 | premoboss | but you say 10k-20k so i suppose you reac 5V-33%=3.3V |
| 10:09.33 | Ryp | yeah this is what I should get |
| 10:11.14 | premoboss | but if you get 2.5V there are somehng frong. verify that bot 10 and 20k are _REALLY_ 10k and 20k resistors :-) |
| 10:11.33 | Ryp | in fact I used 3 10k resistors xD |
| 10:11.52 | premoboss | 2 of them must be in serie |
| 10:11.57 | Ryp | yup |
| 10:12.17 | premoboss | redo and try again. |
| 10:12.39 | Ryp | the Data pin tend to be lower than 5V |
| 10:12.54 | Ryp | i'll adjust my resistor values and test again |
| 10:19.43 | Ryp | premoboss: ok so I got a proper 3.10V now |
| 10:19.50 | premoboss | good. |
| 10:20.02 | premoboss | what was the error on reistor scheme? |
| 10:20.33 | Ryp | I powered the reader on the 5V pins of the cubie |
| 10:20.42 | Ryp | on the raspberry i was enough |
| 10:20.53 | Ryp | not here so I plugged the 12V |
| 10:21.13 | Ryp | 4.9V for the data pins now |
| 10:21.59 | premoboss | goon. now the signal levels should be clean enough. redo your test. |
| 10:29.15 | Ryp | mmmh |
| 10:29.55 | Ryp | i get no edges anymore now |
| 10:30.19 | Ryp | i think the low voltage is not 0V at all |
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| 10:33.13 | Ryp | ok now I see a little bit clearly. My reader is supplied in 12V. and the data pins have 5V relative to the GND |
| 10:33.41 | Ryp | however, the reader and the cubie have a ~1.5 difference GND to GND |
| 10:33.45 | Ryp | is that normal ? |
| 10:35.50 | Ryp | so the actual reading i of the gpio is ~1.4V |
| 10:38.25 | Ryp | premoboss: how can I balance the voltage now ? |
| 10:39.40 | premoboss | you cannot mix 12V, 5V and 3V3 |
| 10:40.16 | premoboss | if there is a differenve beteen the 2 GRD, in menas tha there are somethin wtong. |
| 10:41.12 | Ryp | 12V is only used to power the reader, the wires used for reading are 5V |
| 10:41.53 | premoboss | ok. |
| 10:41.58 | premoboss | the probme is tu |
| 10:42.04 | premoboss | is to find tere the problem is. |
| 10:42.35 | premoboss | can you simulate the module output using another CB? |
| 10:43.27 | Ryp | yeah i could |
| 10:43.38 | Ryp | even with the same cubieboard |
| 10:43.45 | Ryp | didn't try that |
| 10:45.33 | premoboss | if you can emulate and it works is ok. it menas the the problmen is elsewere. but not user the same cb, use the raspeberry to generate impulses. |
| 10:45.55 | Ryp | i've got two cubie and a pi |
| 10:46.12 | Ryp | gonna grab lunch and do that |
| 10:46.26 | Ryp | thanks for your help premoboss, very appreciated |
| 10:46.26 | premoboss | look, the emulation mst be done withy 2 DIRRETENT sistem, not on the same one. so use cb+cb or cb+rb |
| 10:46.35 | premoboss | u welcome bye |
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| 11:08.26 | casaper | Hi there. Does any of you know any alternatives to shairport? Something that would also allow to serve Airplay for example. |
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| 11:32.58 | Ironflix | hi, i think i have overwritten the complete nand including the original script.bin file by upgrading to the lubuntu desktop image (cubieboard 1) through Phoenix Suit. of course i have forgotten to backup the script.bin . is the script.bin in the image the one the cubieboard was originaly shipped with? |
| 11:33.40 | Ironflix | i downloaded it from here http://cubieboard.org/download/ |
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| 12:51.55 | Ryp | premoboss: fixed my wiring: still reading garbage |
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| 14:51.42 | premoboss | Ryp, i duno how to do, sorry. |
| 14:56.18 | Ryp | meh, no problem mate =) |
| 15:03.58 | premoboss | Ryp, i think again: ig there are difference of foltage between the two GRD, sometrhin is wrong. |
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| 15:04.44 | Ryp | I guess so :/ |
| 15:05.07 | Ryp | but right now my wiring seems normal |
| 15:05.39 | Ryp | I'm too lazy to make my raspi output debug wiegand, so i'm just retrying the actual wiring with a pi |
| 15:06.02 | Ryp | damn those pi's are Slooww (also too lazy to setup distcc) |
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| 20:34.27 | old-papa-work | hope someone is here, can the cubie send a break like 100 ms on the Tx line no pulse, true break? |
| 20:34.37 | old-papa-work | Or is it like the arduino. |
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