C5504 GPIO[18:20,27] instead of I2S2

GaryS57064

Other Parts Discussed in Thread: TMS320C5504

Sorry for the innane post, but I have been through sprugh6 (TMS320C5504 DSP System User's Guide), sprufo4 (General-Purpose Input/Output) and sprufx4 (Inter-IC Sound (I2S) Bus) a few times and seem to be missing something obvious.

I know that the PPMODE bits in the EBSR are responsible for the pertinent pin multiplexing (per sprugh6 section 1.7.3.1 External Bus Selection Register). Only two of those modes apply to a device without the LCD controller; 001 and 110. I currently am setting the PPMODE bits to 001 because this is indeed the peripheral set that I need sans the I2S2. In other parts of the EBSR definition I see bitfields for reconfiguring I2S0 (SP0MODE) and I2S1 (SP1MODE) as GPIO, however I cannot seem to find any such setting for I2S2. Am I just blind, or did I make a mistake in assuming that I could reconfigure these pins as GPIO?

Thanks in advance,

Gary

over 14 years ago

0 Steve Tsang over 14 years ago

TI__Mastermind 23785 points

I2S3 pins and GPIO28-31 share the same physical pins. They can only be selected either 010 or 011 in PPMODE. They are mutually exclusive. So no need for something likes SPxMODE.

0 GaryS57064 over 14 years ago in reply to Steve Tsang

Intellectual 310 points

Sorry for being dense, but PPMODE 010 and 011 also map in the LCD controller which is not supported on the C5504. Does any of the PPMODE settings allow me to map in SPI, UART, GPIO[12:17] and GPIO[18:20,27]?

Thanks.

0 Steve Tsang over 14 years ago in reply to GaryS57064

TI__Mastermind 23785 points

GPIO[18-20,27] is selectable only on PPMODE 010.

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C5504 GPIO[18:20,27] instead of I2S2