That mean you are still not ready to learn anything.

Owai-, what SPI mode? I haven't been told about this SPI thing in microcontroller.

can I just use a table?

SPI transmission. Not very hard lar. Just read up the notes and you should be fine. The last time while I was doing 8051 I had to simulate an internal SPI using software emulation. With modern PICs, the SPI clocks are easily generated. Should be okay wan...

Just like the PS2 controllers, semua guna SPI protocol.

I didn't learn 8051 because while others are learning it over diploma, I did A-levels in biology. But my final year project has PIC microcontroller using PS/2 keyboard. I don't recall about SPI though.

PS2 as in Playstation 2 controller lol.

What PIC are you using? ATMEGAs? They have a list of documents on applications.

For your use, you just need to find the articles listed together with the PIC (if you're using atmel)

Just use master to slave mode to control your chip.

EDIT:

To make it easier for you to follow, just do this:

1) Generate SPI Clock first. Fast is good but depending on the chip you're trying to communicate you might need to adjust this a little bit.
2) Next, the function C should include SPI send byte, and SPI interrupt that checks whether the transmission went well.
3) When you have these functions working, you should be able to send whatever digital streams you need to your PGA2310

This post has been edited by LittleGhost: Dec 8 2010, 10:37 PM

I don't do atmel as well. The programmer is scarce compared to PIC, hence I literally used PIC for life.

The PIC16F887 datasheet does not seem to have mentioned explicitly about SPI or master/slave mode. I will try to take a look at it again but chances are, it doesn't have SPI (?).

Oh lol, looks like I'm so old-minded to think about PS/2 interface.

I posted something else, look above.

EDIT: Shitttt, this thing is poisonous. I have a big urge to build one also. I have alot of papers next week. how does i refrain? LOLLOL.

This post has been edited by LittleGhost: Dec 8 2010, 10:42 PM

Create PWM clock like in PS/2 keyboard, that I know. SPI... I really need to investigate if PIC16F887 has such thing.

If u look in PIC16F887 datasheet. The description about SPI can be found in chapter 13 - MASTER SYNCHRONOUS SERIAL PORT (MSSP) MODULE and the SPI can be found in chapter 13.3

The PIC need to be as Master Mode to send data to PGA. In the datasheet, Under SPI Mode (Master Mode) chapter, Just shown 8bit (1byte) data transmission. But PGA need to sent 16bit (2byte) data stream, 1byte for right channel and 1byte more for left. So, it need to be sent twice of 1byte in the SPI transmission. Just make sure CS input on PGA is pulling down while send these 2 byte data.

maybe u know already how to make the connection between PIC and PGA, here i just wanna share how to connect the PIC to PGA


PIC pin RC5/SDO to PGA SDI
PIC pin RC3/SCK to PGA SCLK
any PIC pin to PGA CS

Since, just use single PGA. So, SDO on PGA is not used coz, its just used to chain other PGA

If u don't want mess with the SPI. Other trick is, Pull High or Low (corresponding to the value u wanna send) on SDI input and Pull SCLK input High, delay some time, than pull back SCLK input low to genarate the clock, repeat this step for 16 times..

This post has been edited by mess o' wrecko: Dec 9 2010, 12:58 PM

Mmm. LittleGhost and mess o' wrecko, it would be really great to have both of you in my MSN contact list.

just pm me for it after this week.

I have too many shit to do this week (4 tests and 1 lab :|)

mengsuan, get your hand itchy now with this:

http://www.amb.org/audio/alpha10/

Once you have this, you cant buy anything better even you pay for RM30~40k for a commercial stuff. Engineers rock.

Chasing for something sound nice to your ears mean nothing, chasing for HIGH END is everything.

Very nice indeed. The alpha 10 uses modules instead of one large board, easing any future addons I suppose. I have looked into some PCB layout of his. For some reason, I don't have confidence doing dual layer PCB.

Remember I was mentioning about TLE2426 for power rail splitter? Now I might have slight changes on my amplifier design to accommodate specially for low impedance headphones. I am planning to have 2 op amps to provide large currents but TLE2426 would peak at 20mA. Can I put two TLE2426 in parallel or would it upset the splitter's stability?

Yes you will because the TLE2426 will fight with each other.

Just buffer the ground channel with a beefy opamp.

Head over to tangent's site tangentsoft.net on his article about virtual grounding. It's somewhat incorrect in small parts but is still a very good read.

Tangentsoft's virtual grounding notes are like my bible. I used the page for 2 years. Adding another buffer doesn't seem to be part of my plan.

I've seen many shortcuts that people are using to produce more instantaneous current, like using capacitors from rails to virtual ground, or even simpler, rail to rail. However tangentsoft's website advices not to use capacitors after the active rail splitter as capacitive load would disrupt the "bandwidth".

Probably I would have to put them into prototype and listen to decide the better arrangement.

good news is...we have so many expert here. check my tube project under Miscelenous tab in my blog.

This post has been edited by kubing: Dec 21 2010, 01:02 PM

How does your YAHA sound?

i have video upload there. I regret not to built this amp long time before. very warm. For a good result used battery 12V.