Linux/PROCESSOR-SDK-AM335X: USB serial communication

khageswararao bongu

Tool/software: Linux

Hi,

i am using am335x EVM with ti-processor-sdk-linux-am335x-evm-03.00.00.04 SDK. i want to send and receive serial data from EVM to host Machine.
Present i am using /dev/ttyGS0 device file in EVM and /dev/ttyACM0 in host pc(ubuntu 14.04) to send and receive data.

some times i am getting below prints in Host pc when i am reading . After that i am not able to send and receive data

recv= " http://arago-project.org am335x-evm ttyGS0\r\n\r\nArago "

recv= "2016.05 am335x-evm ttyGS0\r\n\r\nam335x-evm login: "

please suggest me what are things i need to check.

thank you.

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

What is your connection to the Host machine?

0 khageswararao bongu over 8 years ago in reply to Biser Gatchev-XID

Expert 1380 points

hi Biser thanks for your quick response.
i am using micro usb to usb cable (moble charging cable). to send data through serial communication.
just know i updated my post please check it.
thank you.

0 Biser Gatchev-XID over 8 years ago in reply to khageswararao bongu

TI__Guru**** 393215 points

This is USB0, and you need to configure it for Gadget Serial Device: processors.wiki.ti.com/.../MUSB_Linux_Driver_Configuration However you should not that USB serial device is not verified in the Linux SDK at present: processors.wiki.ti.com/.../Linux_Core_MUSB_User's_Guide

0 khageswararao bongu over 8 years ago in reply to Biser Gatchev-XID

Expert 1380 points

Hi Biser,

What you are suggested that is correct, it was already enabled in ti-processor-sdk-linux-am335x-evm-03.00.00.04 sdk, and i am getting gadget device name with /dev/ttyGS0 in EVM mechine, /dev/ttyACM0 in host mechine(ubuntu 14.04).

based on this Document https://www.kernel.org/doc/Documentation/usb/gadget_serial.txt

now i am trying to send data(AAAAAAA) from /dev/ttyGS0 (EVM) and receive from /dev/ttyACM0 (Host machine).

but in host machine side i am getting debug prints(this is not original data ) also after this i am not able to send and receive data.

readData=AAAAAAA

readData=AAAAAAA
readData= _____                    _____           _
readData=    _
| _ |___ ___ ___ ___   | _ |___ __
readData=_ |_|___ ___| |_
|     | _| .'| . | . | |
readData= __| _| . | | | -_| _| _|
|__|__|_| |__,|_
readData=|___| |__| |_| |___|_| |___|___|_|

readData=      |___|                    |___|
readData=

Arago Project http://arago-project.org am335
readData=x-evm ttyGS0

rago 2016.05 am335x-evm ttyGS0
readData=

0 Bin Liu over 8 years ago in reply to khageswararao bongu

TI__Guru**** 172871 points

Please describe how exactly you run the test so that I can replicate it here to investigate it. Thanks.

0 khageswararao bongu over 8 years ago in reply to Bin Liu

Expert 1380 points

hi Bin Liu, please help me for get out form the below issue.
e2e.ti.com/.../614745

thank you,

0 Bin Liu over 8 years ago in reply to khageswararao bongu

TI__Guru**** 172871 points

Sorry Khageswararao, I am unable to help you in that issue, I didn't test usb ACM gadget with Windows host.

By the way, did you solve the issue in this thread? You didn't reply to my question on how did you run the test.

0 khageswararao bongu over 8 years ago in reply to Bin Liu

Expert 1380 points

Hi, i resolved that

before open the ttyGS0 Device we must stop ttyGS0 Service. in EVM

#cd /bin

#systemctl stop serial-getty@ttyGS0.service

now i want to Send Data through Uart1. i added setting in arch/arm/boot/dts/am335x-evmsk.dts file

uart1_pins: pinmux_uart1_pins { 
pinctrl-single,pins = < 
0x180 (PIN_INPUT_PULLUP | MUX_MODE0) /* uart1_rxd.uart1_rxd */ 
0x184 (PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* uart1_txd.uart1_txd */ 
>; 
};
uart1: serial@48022000 { 
pinctrl-names = "default"; 
pinctrl-0 = <&uart1_pins>; 
status = "okay"; 
};

But i dont know from where can i take connections on EVM (TMDXEVM3358-SK_LCD) Board

Thank you

0 Bin Liu over 8 years ago in reply to khageswararao bongu

TI__Guru**** 172871 points

khageswararao bongu said:

now i want to Send Data through Uart1. i added setting in arch/arm/boot/dts/am335x-evmsk.dts file
...

But i dont know from where can i take connections on EVM (TMDXEVM3358-SK_LCD) Board

Please open a new thread for your uart1 question with a proper post subject. Since this thread has "USB" in the subject, our uart experts will likely not monitor this discussion and don't see your new uart question.

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Linux/PROCESSOR-SDK-AM335X: USB serial communication