Jonathan,
Spot on as always. The two ways to make noise are to either play one of 48 fixed "notes" from the PWT or to stream PCM to the modem codec (after switching it to take control rather than allowing the modem to control it) which is the way we play polyphonic ringtones, Spectrum 128 sound and audio on MPEG adverts. But to do this requires code running on the C55x DSP as only it mcbsp2 (think it's 2, maybe 1 though!) is connected to the codec chip and that mcbsp is a DSP "private" device and can't be programmed from the ARM side of the OMAP.
For Linux use I'm therefore gonna suggest that you are probably limited to PWT and your choice of the 12 notes in each of four octaves.
Cliff
-----Original Message----- From: Jonathan McDowell [mailto:noodles@earth.li]
The only other option I can see for talking to the handset/speaker/mic is via the modem codec.
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On Thursday 02 March 2006 17:51, Cliff Lawson wrote: [...]
For Linux use I'm therefore gonna suggest that you are probably limited to PWT and your choice of the 12 notes in each of four octaves.
Back in the old BBC days I had a speech synth (Superior Software's SPEECH, and I've still to find a cheapo speech synth for my PC that was as good) that worked by playing a continuous tone on the SN76489 sound chip and then modulating the four-bit amplitude very quickly. Could a similar trick be done to wrange sampled sound out of the PWT?
--- David Given dg@cowlark.com wrote:
On Thursday 02 March 2006 17:51, Cliff Lawson wrote: [...]
For Linux use I'm therefore gonna suggest that you are probably limited to PWT and your choice of the 12 notes in each of four octaves.
Back in the old BBC days I had a speech synth (Superior Software's SPEECH, and I've still to find a cheapo speech synth for my PC that was as good) that worked by playing a continuous tone on the SN76489 sound chip and then modulating the four-bit amplitude very quickly. Could a similar trick be done to wrange sampled sound out of the PWT?
I'm talking about the aic23 stero codec which the E3 seems to have 2 of ?! You don't need the DSP either as the BSP that sends the sound samples (via I2S) can be mapped to either the DSP or the CPU.
Thanks for the FB patch's Jonathan, but your E3_defconfig doesn't seem to have been updated to enable the FB :-(. In fact your patchs like very much like the changes I have made (great minds ;), however, your patch (like my version) only seem only yeild a blue display on my E3 (different hardware version?!) I'll have a play around this weekend to see if I can find you what's wrong. In the mean time would it be possible to post your working FB config plus a kernel uImage (just to make sure that we are running execatly the same code).
Keep on hacking :)
Mark
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On Thu, Mar 02, 2006 at 09:55:51PM +0000, Mark Underwood wrote:
I'm talking about the aic23 stero codec which the E3 seems to have 2 of ?! You don't need the DSP either as the BSP that sends the sound samples (via I2S) can be mapped to either the DSP or the CPU.
Er, really? You have this working?
Thanks for the FB patch's Jonathan, but your E3_defconfig doesn't seem to have been updated to enable the FB :-(. In fact your patchs like very much like the changes I have made (great minds ;), however, your patch (like my version) only seem only yeild a blue display on my E3 (different hardware version?!) I'll have a play around this weekend to see if I can find you what's wrong. In the mean time would it be possible to post your working FB config plus a kernel uImage (just to make sure that we are running execatly the same code).
That patch doesn't have the FB enabled because it doesn't work in it. It has working NAND and an updated keymap over my first patch.
I'm going to have a new patch out before the end of the weekend (hopefully split out and cleaner) that'll add the FB support; I have it working locally.
J.
--- Jonathan McDowell noodles@earth.li wrote:
On Thu, Mar 02, 2006 at 09:55:51PM +0000, Mark Underwood wrote:
I'm talking about the aic23 stero codec which the E3 seems to have 2 of ?! You don't need the DSP either as the BSP that sends the sound samples (via I2S) can be mapped to either the DSP or the CPU.
Er, really? You have this working?
Well, what to you mean by working ;). I looked through the E3 config for the 2.4 kernel and found that it had enabled support for the the aic23 stero codec and after a bit of light hacking I got it to complie under 2.6. The aic23 I2C driver probes for the device and will only try to attach to if it got an ack back from a chip so either the I2C bus is in a state which means it always thinks it has an ack, there is another I2C chip at the same address, or there are 2 aic23 stero codecs on the E3. As I haven't taken mine apart I don't know which it is.
I have DMA interrupts & I2C interrupts, but no sound as yet.
Thanks for the FB patch's Jonathan, but your E3_defconfig doesn't seem to have been updated to enable the FB :-(. In fact your patchs like very much like the changes I have made (great minds ;), however, your patch (like my version) only seem only yeild a blue display on my E3 (different hardware version?!) I'll have a play around this weekend to see if I can find you what's wrong. In the mean time would it be possible to post your working FB config plus a kernel uImage (just to make sure that we are running execatly the same code).
That patch doesn't have the FB enabled because it doesn't work in it. It has working NAND and an updated keymap over my first patch.
I'm going to have a new patch out before the end of the weekend (hopefully split out and cleaner) that'll add the FB support; I have it working locally.
Ah, your blurred picture got me so excited I didn't read your website correctly!
Any hint on how you got the LCD to work? (my FB code seems to match the FB code in your patch), or am I going to have to wait until the weekend!
What else is there to do? Just to confirm, the current status is:
Kernel booting Serial port working USB working NAND reading & writing FB working
Which leaves: sound ?! Mini keyboard (PS2 right?) u-boot NAND read (& write ?) Getting PBL tool to load & run u-boot from flash DSP!!
Mark
J.
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On Fri, 3 Mar 2006, Mark Underwood wrote:
DSP!!
...uh, given that the DSP is basically just a C55 with a little MMU that can only be programmed from the ARM side, what exactly do you envisage doing with it? In cellphones it's used for mp3 playback and speech coding, but that's probably not so useful on E3.
-J.
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Cliff Lawson -
David Given -
jasmine＠electronpusher.org -
Jonathan McDowell -
Mark Underwood