LPC1768 I2S und Wolfson Codec

[husten (Gast)]

hi

ich hab gerade ein Problem mit dem I2S Interface vom LPC1768 und einem 
wolfson Codec ( WM8510 )

Der I2S am LPC hat
I2SRX_CLK Receive Clock. A clock signal used to synchronize the transfer 
of data on the receive channel. It is driven by the master and received 
by the slave. Corresponds to the signal SCK in the I2S bus 
specification.

I2SRX_WS Receive Word Select. Selects the channel from which data is to 
be received. It is driven by the master and received by the slave. 
Corresponds to the signal WS in the I2S bus specification.
WS = 0 indicates that data is being received by channel 1 (left 
channel).
WS = 1 indicates that data is being received by channel 2 (right 
channel).

I2SRX_SDA Receive Data. Serial data, received MSB first. It is driven by 
the transmitter and read by the receiver. Corresponds to the signal SD 
in the I2S bus specification. RX_MCLK Output Optional master clock 
output for the I2S receive function.

I2STX_CLK Transmit Clock. A clock signal used to synchronize the 
transfer of data on the transmit channel. It is driven by the master and 
received by the slave. Corresponds to the signal SCK in the I2S bus 
specification.

I2STX_WS Transmit Word Select. Selects the channel to which data is 
being sent. It is driven by the master and received by the slave. 
Corresponds to the signal WS in the I2S bus specification.
WS = 0 indicates that data is being sent to channel 1 (left channel).
WS = 1 indicates that data is being sent to channel 2 (right channel).

I2STX_SDA Transmit Data. Serial data, sent MSB first. It is driven by 
the transmitter and read by the receiver. Corresponds to the signal SD 
in the I2S bus specification.

TX_MCLK Output Optional master clock output for the I2S transmit 
function.

am wolfson fehlen natürliche inige pins .. weil mono
ADCDAT - Digital Output ADC Digital Audio Data Output
DACDAT - Digital Input DAC Digital Audio Data Input
FRAME - Digital Input/Output DAC and ADC Sample Rate Clock or Frame sync
BCLK - Digital Input/Output Digital Audio Port Clock
MCLK - Digital Input Master Clock Input

demnach müsste ich die WS am LPC hart verdrahten oder? zB pullup gegen 
VCC oder pulldown GND

I2SRX_WS   -->  pulldown -->0 -> left channel
I2SRX_SDA  -->  ADCDAT
I2STX_WS   -->  offen
I2STX_SDA  -->  DACDAT
TX_MCLK    -->  MCLK

und hier bin ich mir nicht sicher :
I2STX_CLK  -->  BCLK
I2SRX_CLK  -->  FRAME

hat schonmal jemand sowas gemacht ?

oder versteht zumindestd ie I2S schnittstelle ?

danke

[Lothar (Gast)]

Schaltplan für LPC4078 (pin-kompatibel zu LPC1768 und WM8903:

http://www.support.code-red-tech.com/CodeRedWiki/RDB4078Docs

Demo-SW für I2S gibt es da auch.

[./. (Gast)]

> http://www.support.code-red-tech.com/CodeRedWiki/RDB4078Docs
Ohne Login findet man da nicht viel.

Das hier?
http://www.support.code-red-tech.com/CodeRedWiki/RDB4078Support

[Lothar (Gast)]

./. schrieb:
> Ohne Login findet man da nicht viel.

Was für ein Login? Click auf: RDB4078 Schematic (PDF)

[husten (Gast)]

Lothar schrieb:
> Schaltplan für LPC4078 (pin-kompatibel zu LPC1768 und WM8903:
>
> http://www.support.code-red-tech.com/CodeRedWiki/RDB4078Docs
>
> Demo-SW für I2S gibt es da auch.


das hilft mir schonmal sehr viel weiter.

vielen Dank


ADCDAT -> I2SRX_SDA
DACDAT -> I2STX_SDA
FRAME  -> I2SRX_WS
BCLK   -> I2SRX_CLK
MCLK   -> RX_MCLK