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| 05:51.59 | mne | Hi. Is anyone familiar with at91 devices like at91sam9260 and the sam-ba boot agent ? I can successfully flash my controller with sam-ba, but it is terribly slow since the USB connection to the controller is only 9600bps. I tried to change the speed of the connection so something liek 115200 bps, but it didn't work. Is the speed of the USB connection to the controller fixed at 9600 bps or is it also possible to flash the controller at higher speeds ? |
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| 06:06.48 | solar | derfers that one to HcE |
| 06:10.16 | davidc__ | mne: IIRC the last time I used samba, I wrote a second stage loader |
| 06:10.20 | davidc__ | erm, sam-ba |
| 06:10.36 | davidc__ | that took over then maxed out download speed |
| 06:10.42 | davidc__ | [but then again, I was using the serial port] |
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| 06:12.46 | mne | davidc__, I just read in the sam-ba manual that sam-ba also supports JTAG and serial ports. The serial port should definitively work at maximum speed (which is 115200 I think). However, since the serial console is also on that port I would prefer the USB connection. I'm currently using samba to flash at91bootstrap (1st stage) and u-boot (second stage) |
| 06:13.33 | davidc__ | mne: it was quite a while ago, but I definitely had a 2nd stage loader |
| 06:14.01 | davidc__ | Actually, now that I think more about it, it was because the flash was broken on my board; so I was loading an entire linux environment into SDRAM ;) |
| 06:16.15 | mne | That's what I used to do with openocd and JTAG. Is was much faster AFAIK. |
| 06:17.50 | mne | I'm also not sure if all the things explained in the sam-ba manual are also relevant for the linux version (http://www.linux4sam.org/twiki/bin/view/Linux4SAM/SoftwareTools) |
| 06:21.42 | HcE | solar: sorry, I'm not really a AT91 user, I only know a lot about the peripherals in the devices. |
| 06:24.02 | mne | speaking of peripherals. Are you running a linux kernel on the AT91 devices ? Once my at91sam9260 board boots correctly, I would like to connect a I2S PCM codec as well as (bus-connected) chip. Can you sugest at91 specific linux programming documentation ? |
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| 06:26.51 | HcE | use the SSC to setup I2S interface |
| 06:27.58 | solar | HcE: I'm kinda thinking you might have a clue about such things better than most in here. Hope that was ok to semi hint you might be. |
| 06:28.49 | mne | HcE, I get just connecting the codec to the I2C port should suffice ? If I enable SSC, it should detect the (linux supported) codec chip on its own, right ? |
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| 06:32.06 | mne | got up to early and is writing nonsense like "I get just connecting ..." |
| 06:33.38 | HcE | I2C or I2S? |
| 06:33.43 | HcE | wide different interfaces |
| 06:33.45 | mne | I2S |
| 06:34.10 | HcE | either you can use the bloated ALSA SOC interface, or use the slightly less bloated ALSA interface |
| 06:34.39 | HcE | for ALSA use drivers/misc/atmel-ssc.c and see the usage from sound/spi/at73c213.c |
| 06:34.46 | HcE | for ALSA SOC you are on your own ;) |
| 06:34.50 | mne | what's the difference ? I though I'll have to use the ALSA SOC interface. |
| 06:35.00 | mne | Ok, I see. |
| 06:35.06 | mne | thanks |
| 06:35.17 | HcE | there are drivers for AT91 and SSC in the ALSA SOC |
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| 06:35.31 | HcE | so hopefully your codec is available, or you have to add a codec file as well |
| 06:35.39 | HcE | in sound/alsa/soc/codec |
| 06:35.42 | HcE | or something like that |
| 06:36.03 | HcE | and probably a rediculous amount of virtual layers to get it all working |
| 06:36.06 | mne | I saw it already there ;) It's a tlv320aic23 |
| 06:36.14 | HcE | then it should be pretty strait forward |
| 06:36.24 | HcE | perhaps you can just enable it in menuconfig |
| 06:36.30 | mne | I hope so. hehe. |
| 06:37.06 | mne | And what do you think would be the best way to connect a parallel interface chip to the at91sam9260 ? I'll have to write a driver for it anyway |
| 06:37.19 | HcE | hook it up to the EBI |
| 06:39.58 | HcE | how you want to expose the chip to user space will depend on what it is |
| 06:40.08 | HcE | maybe a character interface suits good? |
| 06:41.22 | mne | I'l look into EBI. So far I'm new to at91. The device is a voice codec: http://www.dvsinc.com/products/a2000.htm |
| 06:41.29 | mne | character device sounds good ;) |
| 06:46.00 | HcE | sounds like a sound device |
| 06:46.07 | HcE | I would make an alsa driver for it then |
| 06:46.28 | mne | Hmm, ok. |
| 06:46.59 | HcE | do you send/receive raw audio, or something compressed? |
| 06:47.07 | HcE | making an alsa driver is actually quite simple :) |
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| 06:47.40 | mne | On the one side it has in- and output of PCM samples (e.g. coming from the PCM codec). And on the other side I need to have access to the compressed speech frames (in- and output as well). |
| 06:48.05 | mne | raw audio ? |
| 06:49.04 | mne | I would like to tunnel the PCM samples from alsa to the voice codec. Then I would like to somehow access the compressed speech samples and transfer them over a data connection |
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| 06:50.14 | HcE | aha |
| 06:50.53 | HcE | there must have been done something similar, but I would at least use alsa for the raw PCM part |
| 06:51.06 | HcE | you might to pull up a Tekken trick for the encoded part |
| 06:51.29 | mne | lol, ok. |
| 06:52.30 | mne | Maybe I would end up with two devices for the voice codec. One being an ALSA device for the PCM part and one being a character device to access the encoded speech samples |
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| 06:52.47 | mne | btw, thanks for helping |
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| 08:36.24 | methril|work | yo |
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| 09:19.03 | florian | good morning |
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