usart_9bit_interrupt_transfer#
Overview#
The usart_9bit_interrupt_transfer example shows how to use usart driver in 9-bit mode in multi-slave system. Master can send data to slave with certain address specifically, and slave can only receive data when it is addressed.
In this example, one usart instance is used with address configured. Its TX and RX pins are connected together. First it sends a piece of data out, then addresses itself, after that sends the other piece of data. Only data sent after the address can be received by itself.
Supported Boards#
EVK-MIMXRT685
Hardware requirements
Micro USB cable
EVK-MIMXRT685 board
Personal Computer
Board settings
Using instance 4 of UART interface to transfer data to itself. TX pin is connected with RX pin.
UART4 CONNECTS TO UART4
Pin Name Board Location Pin Name Board Location
TXD J27-2 RXD J27-1
Prepare the Demo
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J5) on the board
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Launch the debugger in your IDE to begin running the demo.
Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
USART 9-bit mode example begins
USART is configured with address, only data sent to itself after matched address can be received
USART will send first piece of data out:
0x 0 0x 1 0x 2 0x 3 0x 4 0x 5 0x 6 0x 7
0x 8 0x 9 0x a 0x b 0x c 0x d 0x e 0x f
USART will address itself
USART will send the other piece of data out:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
USART received data:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
All data matches!
FRDM-MCXW23
Hardware requirements
Type-C USB cable
FRDM-MCXW23 Board
Personal Computer
Board settings
USART1 CONNECTS TO USART1
Pin Name Board Location Pin Name Board Location
TXD J5-5 RXD J5-6
Prepare the Demo
Connect a USB cable between the host PC and the FRDM board J10.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
USART 9-bit mode example begins
USART is configured with address, only data sent to itself after matched address can be received
USART will send first piece of data out:
0x 0 0x 1 0x 2 0x 3 0x 4 0x 5 0x 6 0x 7
0x 8 0x 9 0x a 0x b 0x c 0x d 0x e 0x f
USART will address itself
USART will send the other piece of data out:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
USART received data:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
All data matches!
LPCXpresso51U68
Hardware requirements
Micro USB cable
LPCXpresso51U68 board
Personal Computer
Board settings
UART2 CONNECTS TO UART2
Pin Name FC2_P0_9 Pin Name FC2_P1_14
TXD J2-13 RXD J2-1
Prepare the Demo
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J6) on the board
Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Reset the SoC and run the project.
Running the demo
When the demo runs successfully, the log would be seen on the CMSIS DAP terminal like:
UART 9-bit mode example begins
UART is configured with address, only data sent to itself after matched address can be received
UART will send first piece of data out:
0x 0 0x 1 0x 2 0x 3 0x 4 0x 5 0x 6 0x 7
0x 8 0x 9 0x a 0x b 0x c 0x d 0x e 0x f
UART will address itself
UART will send the other piece of data out:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
UART received data:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
All data matches!
LPCXpresso54628
Hardware requirements
Micro USB cable
LPCXpresso54628 board
Personal Computer
Board settings
USART one board: Using instance 8 of USART interface to transfer data to itself. TX pin is connected with RX pin.
USART8 CONNECTS TO USART8
Pin Name Board Location Pin Name Board Location
TXD J9-2 RXD J12-3
Prepare the Demo
Connect a micro USB cable between the host PC and the LPC-Link USB port (J8) on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
USART 9-bit mode example begins
USART is configured with address, only data sent to itself after matched address can be received
USART will send first piece of data out:
0x 0 0x 1 0x 2 0x 3 0x 4 0x 5 0x 6 0x 7
0x 8 0x 9 0x a 0x b 0x c 0x d 0x e 0x f
USART will address itself
USART will send the other piece of data out:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
USART received data:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
All data matches!
LPCXpresso54S018
Hardware requirements
Micro USB cable
LPCXpresso54s018 board
Personal Computer
Board settings
USART one board: Using instance 9 of USART interface to transfer data to itself. TX pin is connected with RX pin.
USART9 CONNECTS TO USART9
Pin Name Board Location Pin Name Board Location
TXD J13-11 RXD J9-8
Prepare the Demo
Connect a micro USB cable between the host PC and the LPC-Link USB port (J8) on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
USART 9-bit mode example begins
USART is configured with address, only data sent to itself after matched address can be received
USART will send first piece of data out:
0x 0 0x 1 0x 2 0x 3 0x 4 0x 5 0x 6 0x 7
0x 8 0x 9 0x a 0x b 0x c 0x d 0x e 0x f
USART will address itself
USART will send the other piece of data out:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
USART received data:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
All data matches!
LPCXpresso54S018M
Hardware requirements
Micro USB cable
LPCXpresso54S018M board
Personal Computer
Board settings
USART one board: Using instance 4 of USART interface to transfer data to itself. TX pin is connected with RX pin.
USART4 CONNECTS TO USART4
Pin Name Board Location Pin Name Board Location
TXD J13-13 RXD J13-15
Prepare the Demo
Connect a micro USB cable between the host PC and the LPC-Link USB port (J8) on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
USART 9-bit mode example begins
USART is configured with address, only data sent to itself after matched address can be received
USART will send first piece of data out:
0x 0 0x 1 0x 2 0x 3 0x 4 0x 5 0x 6 0x 7
0x 8 0x 9 0x a 0x b 0x c 0x d 0x e 0x f
USART will address itself
USART will send the other piece of data out:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
USART received data:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
All data matches!
LPCXpresso55S06
Hardware requirements
Micro USB cable
LPCXpresso55S06 board
Personal Computer
Board settings
USART3 CONNECTS TO USART3
Pin Name Board Location Pin Name Board Location
TXD J12-2 RXD J12-1
Prepare the Demo
Connect a micro USB cable between the host PC and the LPC-Link USB port (J1) on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
UART 9-bit mode example begins
UART is configured with address, only data sent to itself after matched address can be received
UART will send first piece of data out:
0x 0 0x 1 0x 2 0x 3 0x 4 0x 5 0x 6 0x 7
0x 8 0x 9 0x a 0x b 0x c 0x d 0x e 0x f
UART will address itself
UART will send the other piece of data out:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
UART received data:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
All data matches!
LPCXpresso55S16
Hardware requirements
Micro USB cable
LPCXpresso55S16 board
Personal Computer
Board settings
USART2 CONNECTS TO USART2
Pin Name Board Location Pin Name Board Location
TXD J8-4 RXD J8-3
Prepare the Demo
Connect a micro USB cable between the host PC and the LPC-Link USB port (J1) on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
UART 9-bit mode example begins
UART is configured with address, only data sent to itself after matched address can be received
UART will send first piece of data out:
0x 0 0x 1 0x 2 0x 3 0x 4 0x 5 0x 6 0x 7
0x 8 0x 9 0x a 0x b 0x c 0x d 0x e 0x f
UART will address itself
UART will send the other piece of data out:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
UART received data:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
All data matches!
LPCXpresso55S28
Hardware requirements
Micro USB cable
LPCXpresso55S28 board
Personal Computer
Board settings
UART1 CONNECTS TO UART1
Pin Name Board Location Pin Name Board Location
TXD J17-6 RXD J18-3
Prepare the Demo
Note: MCUXpresso IDE project default debug console is semihost
Connect a micro USB cable between the host PC and the LPC-Link USB port (P6) on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
UART 9-bit mode example begins
UART is configured with address, only data sent to itself after matched address can be received
UART will send first piece of data out:
0x 0 0x 1 0x 2 0x 3 0x 4 0x 5 0x 6 0x 7
0x 8 0x 9 0x a 0x b 0x c 0x d 0x e 0x f
UART will address itself
UART will send the other piece of data out:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
UART received data:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
All data matches!
LPCXpresso55S69
Hardware requirements
Micro USB cable
LPCXpresso55S69 board
Personal Computer
Board settings
UART1 CONNECTS TO UART1
Pin Name Board Location Pin Name Board Location
TXD P17-6 RXD P18-3
Prepare the Demo
Note: MCUXpresso IDE project default debug console is semihost
Connect a micro USB cable between the host PC and the LPC-Link USB port (P6) on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
UART 9-bit mode example begins
UART is configured with address, only data sent to itself after matched address can be received
UART will send first piece of data out:
0x 0 0x 1 0x 2 0x 3 0x 4 0x 5 0x 6 0x 7
0x 8 0x 9 0x a 0x b 0x c 0x d 0x e 0x f
UART will address itself
UART will send the other piece of data out:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
UART received data:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
All data matches!
MIMXRT685-AUD-EVK
Hardware requirements
Micro USB cable
MIMXRT685-AUD-EVK board
Personal Computer
Board settings
Make sure the JP42 2-3 is connected.
Using instance 4 of UART interface to transfer data to itself. TX pin is connected with RX pin.
UART4 CONNECTS TO UART4
Pin Name Board Location Pin Name Board Location
TXD J27-2 RXD J27-1
Prepare the Demo
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J5) on the board
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Launch the debugger in your IDE to begin running the demo.
Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
USART 9-bit mode example begins
USART is configured with address, only data sent to itself after matched address can be received
USART will send first piece of data out:
0x 0 0x 1 0x 2 0x 3 0x 4 0x 5 0x 6 0x 7
0x 8 0x 9 0x a 0x b 0x c 0x d 0x e 0x f
USART will address itself
USART will send the other piece of data out:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
USART received data:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
All data matches!
MCXW23-EVK
Hardware requirements
Mini/micro USB cable
MCXW23-EVK Board
Personal Computer
Board settings
USART1 CONNECTS TO USART1
Pin Name Board Location Pin Name Board Location
TXD J17-4 RXD J17-3
Prepare the Demo
Connect a USB cable between the host PC and the EVK board J33.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
USART 9-bit mode example begins
USART is configured with address, only data sent to itself after matched address can be received
USART will send first piece of data out:
0x 0 0x 1 0x 2 0x 3 0x 4 0x 5 0x 6 0x 7
0x 8 0x 9 0x a 0x b 0x c 0x d 0x e 0x f
USART will address itself
USART will send the other piece of data out:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
USART received data:
0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17
0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x1e 0x1f
All data matches!