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TLV320AIC3204EVM-K: unable to set up digital loopback on the EVM

Ronald Edgar
Intellectual 820 points
Part Number: TLV320AIC3204EVM-K

I am attempting to set up an audio IP on IP1 and send it to line out via the digital loopback path. If I use the analog capability to do the same thing, everything is OK. It appears the problem is in the ADC/DAC, perhaps clock setup. I have tried everything I can think of using the GUI.I have been carefully through the clock setup and believe I have it set correctly. Because of internal dependencies on the order of doing things, do I need to run a script? Does anyone have a script to do this on the EVM they are willing to share. Any help is much appreciated.

Many thanks, Ron

  • 0
    TI__Guru* 84915 points

    Hi, Ron,

    I recommend to take a look at this script. It may be used to configure the digital loopback on the EVM. I only recommend to ensure that all the jumpers and switches are in default state.

    MIC_to_HP_LO.txt 
    ###############################################
# Software Reset
###############################################
#
# Select Page 0
w 30 00 00
#
# Initialize the device through software reset
w 30 01 01
#
###############################################



###############################################
# Clock Settings
# ---------------------------------------------
# The codec receives: MCLK = 11.2896 MHz,
# BLCK = 2.8224 MHz, WCLK = 44.1 kHz
###############################################
#
# Select Page 0
w 30 00 00
#
# NADC = 1, MADC = 2
w 30 12 81 82
#
###############################################
#
# Select Page 0
w 30 00 00
#
# NDAC = 1, MDAC = 2
w 30 0b 81 82
#
###############################################


###############################################
# Signal Processing Settings
###############################################
#
# Select Page 0
w 30 00 00
#
# Set the ADC Mode to PRB_P1
w 30 3d 01
#
# Set the DAC Mode to PRB_P8
w 30 3c 08
#
###############################################



###############################################
# Initialize Codec
###############################################
#
# Select Page 1
w 30 00 01
#
# Disable weak AVDD in presence of external
# AVDD supply
w 30 01 08
#
# Enable Master Analog Power Control
w 30 02 00
#
# Select ADC PTM_R4
w 30 3d 00
#
# Set the input powerup time to 3.1ms (for ADC)
w 30 47 32
#
# Set the REF charging time to 40ms
w 30 7b 01
#
###############################################



###############################################
# Recording Setup
###############################################
#
# Select Page 1
w 30 00 01
#
# Route IN3L to LEFT_P with 20K input impedance
w 30 34 08
#
# Route CM1L to LEFT_M with 20K input impedance
w 30 36 80
#
# Route IN3R to RIGHT_P with 20K input impedance
w 30 37 08
#
# Route CM1R to RIGHT_M with 20K input impedance
w 30 39 80
#
# Unmute Left MICPGA, Gain selection of 6dB to make channel gain 0dB
# Register of 6dB with input impedance of 20K => Channel Gain of 0dB
w 30 3b 0c
#
# Unmute Right MICPGA, Gain selection of 6dB to make channel gain 0dB
# Register of 6dB with input impedance of 20K => Channel Gain of 0dB
w 30 3c 0c
#
# Select Page 0
w 30 00 00
#
# Power up LADC/RADC
w 30 51 c0
#
# Unmute LADC/RADC
w 30 52 00
#
###############################################
# Playback Setup
###############################################
#
# Select Page 1
w 30 00 01
#
# De-pop
w 30 14 25
#
# Route LDAC/RDAC to HPL/HPR
w 30 0c 08 08
#
# Route LDAC/RDAC to LOL/LOR
w 30 0e 08 08
#
# Power up HPL/HPR and LOL/LOR drivers
w 30 09 3C
#
# Unmute HPL/HPR driver, 0dB Gain
w 30 10 00 00
#
# Unmute LOL/LOR driver, 0dB Gain
w 30 12 00 00
#
# Select Page 0
w 30 00 00
#
# DAC => 0dB
w 30 41 00 00
#
# Power up LDAC/RDAC
w 30 3f d6
#
# Unmute LDAC/RDAC
w 30 40 00
#
# Page 0
w 30 00 00
#
# Digital loopback
w 30 1D 10
#
###############################################

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Intellectual 820 points

    This works, thanks. Also, I had an error in the way I connected the input. With your script and that correction, all works properly now. Thanks again! Ron.