AM3358 EVM Serial Port Usage

D. Johnson

AM335x General Purpose EVM... we want to use one of the serial ports on the daughter board, as well as the LCD display.

HW User Guide is not clear, we are guessing that we need to set the CPLD switch for profile 2 (on off on ?) to bring out UART4, but to which D connector does it connect?

Thanks,

Dave

over 13 years ago

0 Joe G. over 13 years ago

TI__Mastermind 25886 points

We got UART2 working with following steps:

UART on the AM335x EVM for UART2 (J12 connector on the back right of the EVM) as ttyO2.

After applying the patch described here:

http://processors.wiki.ti.com/index.php/AM335x-PSP_04.06.00.03_Release_Notes#What.27s_Supported

Based on the AM335x EVM pin mappings described in the .zip file here:

http://processors.wiki.ti.com/index.php/AM335x_General_Purpose_EVM_HW_User_Guide#Functional_Interface_Mapping

You do have to flip the DIP switch on the EVM here::

http://processors.wiki.ti.com/index.php/AM335x_General_Purpose_EVM_HW_User_Guide#CPLD

We used CPLD Profile #3 so gotta flip the DIP switch:

>>the profile switches below the LCD 1 and 2 are set to "ON" with 3 and 4 still "OFF."

After booting on the regular console ttyO0, we entered the following command in the console window:

getty 115200 ttyO2 &

And got a login on the 2nd UART (J12 connector as ttyO2). Supposedly you can go into /etc/inittabs and change the console to ttyO2, but I did not try. Also at times when I logged into ttyO2, it logged me out of ttyO0.

0 D. Johnson over 13 years ago in reply to Joe G.

Intellectual 700 points

Unfortunately with CPLD profile #3 does not support the LCD interface. Only 0,1,2 and 7 support LCD functionality. The UART2 you used is not supported in with LCD.

The pin mapping files do not use the same names as the schematic so it is difficult to follow. CPLD profile uses UART2, UART, BTUART. Schematic uses UART1, UART2, UART3. Would appreciate some clarification as to the CPLD mapping. Is the CPLD code available ?

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AM3358 EVM Serial Port Usage