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| 17:28.01 | nascentmind | Hi. Is a nfs setup necessary for embedded development? Is there an alternative to nfs? I am not comfortable with the security. |
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| 18:34.23 | wmat | nascentmind: no, i do some using only sdcards |
| 18:44.56 | alex4nder | nascentmind: if my target is running well and has net, I'll do scp/rsync. |
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| 19:00.40 | nascentmind | wmat, is the reason same? |
| 19:00.47 | nascentmind | i.e. security |
| 19:02.20 | nascentmind | I am doing custom bootloader work and some linux modifications mostly on the driver side. |
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| 19:06.46 | nascentmind | or should I setup nfs on a virtual machine? |
| 19:12.27 | alex4nder | what're you trying to do? |
| 19:12.44 | alex4nder | just move data onto your device? |
| 19:15.22 | nascentmind | alex4nder, yes. |
| 19:17.26 | nascentmind | alex4nder, also how is it usually done? is it developed on an emulator and then finally moved on to the device for final testing? |
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| 19:22.00 | wmat | nascentmind: what is you're worried about exactly? |
| 19:23.29 | nascentmind | wmat, worried about access to outside world. I am not good with security and don't want to forget some setting which exposes everything to the world. |
| 19:23.40 | wmat | nascentmind: most development I've seen is done on a host linux machine with the target attached via serial/usb. The rootfs and kernel typically reside on an NFS share. |
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| 19:24.07 | wmat | nascentmind: does your target need to be attached to the internet at all during dev? |
| 19:24.38 | nascentmind | wmat, well i have to connect it to my router for network access. |
| 19:25.34 | wmat | nascentmind: you could set up a private internal network |
| 19:26.31 | wmat | nascentmind: i think you're worrying to much |
| 19:27.48 | nascentmind | hmm. yes a little bit. I think if I am careful about exporting the right directories I should not be worrying much I guess. |
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| 21:20.49 | gkwhc | Hi, is it possible to use the SSI/SSP interface to communicate with an I2S interface? The timing diagrams of both interfaces are extremely similar, except for the chip/slave select line of the SSI/SSP interface which pulses high to indicate a transfer, instead of alternating between high/low (same widths) in I2S |
| 21:26.14 | roxfan | well, you could probably make it work by togling the select by timer or something |
| 21:27.03 | prpplague | gkwhc: if you are doing this from linux, you best choice is to just use some gpios and bit bang it |
| 21:27.26 | prpplague | gkwhc: generally running at 100KHz for i2c is plenty doable from gpio bit bang |
| 21:27.53 | roxfan | he's talking about i2s, not i2c |
| 21:28.09 | prpplague | oh sorry |
| 21:28.10 | prpplague | my bad |
| 21:28.14 | prpplague | misread |
| 21:28.16 | gkwhc | hmm |
| 21:28.39 | gkwhc | toggling the select with a timer seems tricky |
| 21:29.33 | gkwhc | plus, if im sending 24bits, i would have to count the falling edge of select three times and toggle it at a gpio for the FS input of I2s |
| 21:30.01 | prpplague | gkwhc: maybe the addition of a cpld would make things easier |
| 21:31.13 | roxfan | http://www.st.com/stonline/books/pdf/docs/14254.pdf uses one |
| 21:31.19 | gkwhc | prpplague: yeah I found a few app notes that uses a cpld, though costs would increase |
| 21:31.43 | roxfan | they claim it's very cheap |
| 21:31.44 | roxfan | The SPI to I2S bridge solution proposed in this |
| 21:31.44 | roxfan | application note is made with a very low cost hardware (about 1$) using a CPLD with less |
| 21:31.44 | roxfan | than 32 macrocells and a minimum of firmware overhead. |
| 21:32.35 | roxfan | what is your mcu? |
| 21:33.04 | gkwhc | lpc111x cortex m0 |
| 21:33.34 | gkwhc | its perhaps the cheapest 32bit mcu in existance |
| 21:33.59 | roxfan | ah |
| 21:34.07 | roxfan | yeah, no i2s on those |
| 21:34.38 | gkwhc | i've been looking into nuvoton's m0 series that has i2s |
| 21:34.53 | gkwhc | they are very power hungry |
| 21:37.28 | gkwhc | i suppose i should spend a few days on writing code for i2s with the ssi/ssp + timer and simulate it with uvision |
| 21:38.39 | gkwhc | roxfan: do you use the lpc11xx series? |
| 21:38.56 | roxfan | not exactly |
| 21:38.59 | roxfan | but i know them |
| 21:39.29 | gkwhc | ok |
| 21:43.18 | roxfan | http://knowledgebase.nxp.com/forumdisplay.php?f=4 <- post your question here, if anyone knows how to do it with LPCs it's these guys |
| 21:43.43 | gkwhc | okay thanks! |
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| 22:49.59 | gkwhc | wow, i just had a look at dsPICs..they consume far more current than LPCs from NXP! though im not sure if its right to compare them that way since one evaluates current consumption according to MIPS and the other according to MHz |
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