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Kernel Setup
Enter the kernel configuration by running the following command in the top directory of project.
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Execute the make command to build the Linux image.
ConfigFS (CDC ACM)
Configure serial gadget through configfs saved as a file named setup_serial.
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#!/bin/sh
USB2_ACM_EN=on
USB3_ACM_EN=on
KERNEL_PATH=/lib/modules/`uname -r`/kernel
GADGET_PATH=$KERNEL_PATH/drivers/usb/gadget
FUNCTION_PATH=$GADGET_PATH/function
COMPOSITE=$GADGET_PATH/libcomposite.ko
U_SERIAL=$FUNCTION_PATH/u_serial.ko
insmod $COMPOSITE
insmod $U_SERIAL
# disable debug message
echo 0 > /sys/module/sunplus_udc/parameters/dmsg
mkdir -p /sys/kernel/config
mount -t configfs none /sys/kernel/config
if [ $USB2_ACM_EN = on]
then
cd /sys/kernel/config/usb_gadget
# create gadget folder
mkdir g1
cd g1
# setup gadget
echo 64 > bMaxPacketSize0
echo 0x200 > bcdUSB
# composite class
echo 0x02 > bDeviceClass
mkdir -p configs/c.1
mkdir -p configs/c.1/strings/0x409
echo "USB2.0 Serial Console" > configs/c.1/strings/0x409/configuration
mkdir strings/0x409
echo "1234" > strings/0x409/serialnumber
echo "Sunplus" > strings/0x409/manufacturer
echo "SP7350" > strings/0x409/product
mkdir functions/acm.gs0
ln -s functions/acm.gs0 configs/c.1
# bind UDC
echo "f8102800.usb" > UDC
fi
if [ $USB3_ACM_EN = on]
then
cd /sys/kernel/config/usb_gadget
# create gadget folder
if [ $USB2_ACM_EN = on]
then
mkdir g2
cd g2
else
mkdir g1
cd g1
fi
# setup gadget
echo 64 > bMaxPacketSize0
echo 0x300 > bcdUSB
# composite class
echo 0x02 > bDeviceClass
mkdir -p configs/c.1
mkdir -p configs/c.1/strings/0x409
echo "USB3.0 Serial Console" > configs/c.1/strings/0x409/configuration
mkdir strings/0x409
echo "5678" > strings/0x409/serialnumber
echo "Sunplus" > strings/0x409/manufacturer
echo "SP7350" > strings/0x409/product
mkdir functions/acm.gs1
ln -s functions/acm.gs1 configs/c.1
# bind UDC
echo "f80a1000.dwc3" > UDC
fi |
Test (CDC ACM) Configuartions
Use sh setup_serial command to configure USB 2.0 and USB3.0 device controllers as serial gadgets.
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In Device Manager of Windows PC, “USB Serial Device (COM17)“ (USB2.0 serial gadget) and “USB Serial Device (COM18)“ (USB3.0 serial gadget) will show up in “Ports (COM & LPT)”.
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Serial Device Test
Use the communication tool of Putty for the test with a Windows PC.
TX Test for USB2.0 Serial Gadget
Use the following command to transfer characters of “SP7350 USB2.0 Serial Gadget TX Test“ to COM17 through ttyGS0 (USB2.0 serial gadget).
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The characters will be received by COM17 open in Putty.
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TX Test for USB3.0 Serial Gadget
Use the following command to transfer characters of “SP7350 USB3.0 Serial Gadget TX Test“ to COM18 through ttyGS1 (USB3.0 serial gadget).
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The characters will be received by COM18 open in Putty.
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RX Test for USB2.0 Serial Gadget
Use the following command to receive characters transferred from COM17 through ttyGS0 (USB2.0 serial gadget).
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Input the characters of “SP7350 USB2.0 Serial Gadget RX Test" in Putty with COM17 and press “Enter”. The characters will be received by COM4 (console) open in Putty.
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RX Test for USB3.0 Serial Gadget
Use the following command to receive characters transferred from COM18 through ttyGS1 (USB3.0 serial gadget).
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