Context Navigation

TracNav

Hardware [[DevicesList(...)]]
Development
Vendors

V3 Sound

Description

V3 uses IC2201 chip for audio output. This chip is a full analog of the well known MPEG codec VS1101k [1]. The codec has two interfaces: control interface SCI and data interface SDI. It seems that there is no connection between the microcontroller and SDI. Both interfaces are connected to the same SPI line of S3C2410 controller, as described in [3].

Connection to Samsung S3C2410 MCU

VS1001k			S3C2410
Pin	Name	Type	Pin	Name	Notes
SCI
30	SO	out	T7	GPE11/SPIMISO0	*1
29	SI	in	U7	GPE12/SPIMOSI0	*1
28	SCLK	in	P8	GPE13/SPICLK0	*1
23	xCS	in	T2	GPD8/VD16
SDI
10	SDATA	in	U7	GPE12/SPIMOSI0	*2
9	DCLK	in	P8	GPE13/SPICLK0	*2
13	BSYNC	in	R3	GPD9/VD17	*3
8	DREQ	out	G4	GPG3/TOUT3	*4
Other
	SDI_MUX	in	M3	GPC11/VD3	*5
3	xRESET	in	L4	GPC10/VD2
6,14,19	VDD[0..2]	PWR	G2	GPB7/nXDACK1	*6
	UNKNOWN		H4	GPB8/nXDREQ1	*7

Notes:

Analog of SPI0 master mode
Connected to SPI line via a multiplexer
According to [2], this line must be activated every time a byte is sent to SDI, but it would suffice to set the line to 0 in the beginning of the block and to 1 at the end of the block;
The pull up resistor must be switched off;
Control of the multiplexer that connects the SDI line to the controller's SPI line. The SCI interface is always connected to the line, so the xCS should be set to high level before using SDI;
This is not a direct connection. GPB7 line manages the power supply of the sound chip;
This line must be always set to 1. We could not identify the line, but unless it is set to 1 before the power is supplied to codec, the device hangs;

Headphones discovery

GPI0 signal GPF3 is used to determine whether headphones are plugged in. Pull up resistor must be enabled with GPFUP register. The line may be switched to the interrupt mode. It seems reasonable to include this function into the keyboard driver.