USB to uart sever based on lpc54018
| folder | description |
|---|---|
| hardware | hardware schematic |
| kernel driver | kernel driver sources |
| lpc_firmware_download_tool | Linux side DFU download tool and MCU firmware |
| user_space_test_program | user space test program and demo |
| reference | other reference |
| misc | other reference |
- Copy file kernel_driver/lpc54xxx.c file to Linux kernel source directory drivers/usb/serial/
- Add below code to Linux kernel source file drivers/usb/serial/Makefile:
obj-$(CONFIG_USB_SERIAL_LPC54XXX) += lpc54xxx.o
- Add below code to Linux kernel source file drivers/usb/serial/Kconfig:
config USB_SERIAL_LPC54XXX
tristate "USB LPC54XXX USB Serial Driver"
help
Say Y here if you want to use a LPC54XXX 10 port
USB to serial converter device.
To compile this driver as a module, choose M here.
- On Linux kernel source folder, run ‘make menuconfig’ and select above item (“Linux kernel source”) to ‘*’, then compile the Linux kernel by executing ‘make’.
Environment required for download tool (LPC_firmware_download_tool/dfu-utils):
-
CPU: arm64
-
SYSTEM: linux
-
Copy the download folder LPC_firmware_download_tool/* to a arm64 platform (such as LS1021ATWR)’s directory /usr/bin/. Connect a USB cable between arm64 platform USB host port and target LPC board’s USB upstream port.
-
Log on arm64 platform /usr/bin/LPC_firmware_download_tool/, execute below command to download LPC firmware:
root@ls1021atwr:/usr/bin/LPC_firmware_download_tool# ./download.sh
log:
dfu-util 0.9
Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/
dfu-util: Invalid DFU suffix signature
dfu-util: A valid DFU suffix will be required in a future dfu-util release!!!
Opening DFU capable USB device...
ID 1fc9:001f
Run-time device DFU version 0110
Claiming USB DFU Interface...
Setting Alternate Setting #0 ...
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
DFU mode device DFU version 0110
Device returned transfer size 512
Copying data from PC to DFU device
Download [=========================] 100% 62776 bytes
Download done.
state(8) = dfuMANIFEST-WAIT-RESET, status(0) = No error condition is present
Done!
************************************************************************************************
Congratulations! Now the operation download firmware is successful. Host board (arm64) will begin re-enumerate LPC board as a special USB serial port device automatically.
run：
root@ls1021atwr:/usr/bin/LPC_firmware_download_tool# ls /dev/ttyUSB
If you can see above 10 ttyUSBx device file ,the firmware have been running correctly.
Besides, we also have implement a test program which can be run on arm64 platform, please see folder user_space_test_program/ for details.
The device’s driver has added two files in sysfs to show the number of sending and receiving data (in bytes). The file named “send_bytes” means the data ttyUSBx device has sent since usb serial device got enumerated. Similarly, the file named “recv_bytes” means the data ttyUSBx device have received since usb serial device got enumerated.
Here is an example:
root@ls1043ardb:/sys/bus/usb/devices/1-1.4:1.0/ttyUSB8# cat send_bytes
360855
root@ls1043ardb:/sys/bus/usb/devices/1-1.4:1.0/ttyUSB8# cat recv_bytes
360855
UART pinmux table:
| 串口 | PIN | 复用功能 |
|---|---|---|
| UART0_TX(内部debug使用) | P0_30 | 1 |
| UART0_RX(内部debug使用) | P0_29 | 1 |
| UART0_CTS | N/A | N/A |
| UART0_RTS | N/A | N/A |
| UART1_TX | P1_11 | 2 |
| UART1_RX | P1_10 | 2 |
| UART1_CTS | P0_13 | 1 |
| UART1_RTS | P0_14 | 1 |
| UART2_TX | P1_25 | 1 |
| UART2_RX | P1_24 | 1 |
| UART2_CTS | P1_26 | 1 |
| UART2_RTS | P1_27 | 1 |
| UART3_TX | P0_2 | 1 |
| UART3_RX | P0_3 | 1 |
| UART3_CTS | P0_1 | 2 |
| UART3_RTS | P0_7 | 1 |
| UART4_TX | P3_27 | 3 |
| UART4_RX | P3_26 | 3 |
| UART4_CTS | P3_28 | 3 |
| UART4_RTS | P3_29 | 3 |
| UART5_TX | P2_13 | 5 |
| UART5_RX | P2_12 | 5 |
| UART5_CTS | P2_14 | 5 |
| UART5_RTS | P2_15 | 5 |
| UART6_TX | P4_3 | 2 |
| UART6_RX | P4_2 | 2 |
| UART6_CTS | P4_0 | 2 |
| UART6_RTS | N/A | N/A |
| UART7_TX | P2_20 | 3 |
| UART7_RX | P2_19 | 3 |
| UART7_CTS | P1_21 | 1 |
| UART7_RTS | P1_20 | 1 |
| UART8_TX | P3_17 | 1 |
| UART8_RX | P3_16 | 1 |
| UART8_CTS | P3_4 | 3 |
| UART8_RTS | P3_5 | 3 |
| UART9_TX | P3_3 | 2 |
| UART9_RX | P3_2 | 2 |
| UART9_CTS | P3_30 | 1 |
| UART9_RTS | P3_31 | 1 |