Hello, I would like to ask, how to connect SAM3X's native USB port to imx6q's USB port under Linux(UDOOBuntu). As it seems from reference manual, the port is connected like I want it under Android by default, but not under Linux. I've studied schematics and there is USB switch controlled by some GPIO from imx6q (part U16, AOZ6184). however, the switching signal "USB_OTG_SEL" leads nowhere. I need to gather data from SAM3X at much faster speeds that default serial connection allows me to. Which GPIO controls the USB switching circuit, especially it's USB_OTG_SEL signal ? Thanks for reply. Best regards, Filip.
Hi filipxsikora! The same documentation of Android is valid: http://www.udoo.org/docs/Android/UDOO_Switch_Between_Adb_Debug_And_ADK_Connection Follow the section that tells "Switch from Debug Mode (MicroUSB plugged in CN3) to INTERNAL ADK mode (i.Mx6 <-> SAM3X)" Under Linux you have to add these commands (you'll probably need root's privilege) Code: echo 128 > /sys/class/gpio/export echo 203 > /sys/class/gpio/export echo 1 > /sys/class/gpio/gpio128/value echo 1 > /sys/class/gpio/gpio203/value
Thank you for your reply. Unforunetaly it is not working. I cannot export mentioned GPIO's, but they are exported already. (I'm using UDOOBuntu 1.1 on UDOO Quad). I can however write values to them, but it's not doing anything. I have connected jumpers J2 and J18. So I will describe my procedure to check if I haven't messed anything. 1. I upload my program to SAM3X from JTAGICE3 from Atmel using JTAG pins on UDOO. 2. I write 1 to GPIO's 128 and 203 from Linux terminal at UDOO. 3. I try command "lsusb" from Linux terminal, my device is nowhere. 4. I reset SAM3X by jumper (I've tried also reset by JTAGICE3) 5. I try "lsusb" again, my device is still not shown. I have also separate Arduino DUE, where I've tried my code and it is working fine there using Arduino DUE's native USB port connected to UDOO's USB port. When I try "lsusb" with my Arduino connected, my device is normally detected. Am I doing something wrong there ? Thank you.
It's not obvious that the Linux Kernel have activated all the necessary modules to see SAM3X as native port, because we don't support this functionality under Linux.
That's a pitty really. Because from my tests, I was able to get around 150Mbps transfer rate from my Arduino DUE. Sometimes it's good or even crucial to get more than 1Mbps (more or less, speed depends on many things) from UART.
