uart_9bit_interrupt_transfer#
Overview#
The uart_9bit_interrupt_transfer example shows how to use uart 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 uart 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#
FRDM-K22F
Hardware requirements
Mini/Micro USB cable
FRDM-K22F board
Personal Computer
Board settings
UART one board: Using instance 2 of UART interface to transfer data to itself. TX pin is connected with RX pin.
UART2 CONNECTS TO UART2
Pin Name Board Location Pin Name Board Location
TXD J1-4 RXD J1-2
Prepare the Demo
Connect a mini USB cable between the PC host and the OpenSDA USB port on the board.
Open a serial terminal on PC for OpenSDA serial device with these settings:
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 OpenSDA 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!
FRDM-K32L2B
Hardware requirements
Mini USB cable
FRDM-K32L2B board
Personal Computer
Board settings
Using instance 2 of UART interface to transfer data to itself. TX pin is connected with RX pin.
UART2 CONNECTS TO UART2
Pin Name Board Location Pin Name Board Location
TXD J4-5 RXD J4-7
Prepare the Demo
Connect USB to Com Converter between the PC host and the port on the board.
Open a serial terminal on PC for serial device with these settings:
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 UART Terminal port which connected to the USB2COM 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!
TWR-KM34Z75M
Hardware requirements
Mini USB cable
TWR-KM34Z75M board
Personal Computer
Board settings
UART one board: Using instance 1 of UART interface to transfer data to itself. TX pin is connected with RX pin.
UART1 CONNECTS TO UART1
Pin Name Board Location Pin Name Board Location
TXD J25-9 RXD J25-8
Prepare the Demo
Connect a USB cable between the host PC and the OpenSDA USB port 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.
Reset the SoC and run the project.
Running the demo
When the demo runs successfully, the log would be seen on the OpenSDA 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!
TWR-KM35Z75M
Hardware requirements
Micro USB cable
TWR-KM35Z75M board
Personal Computer
Board settings
UART one board: Using instance 0 of UART interface to transfer data to itself. TX pin is connected with RX pin.
UART0 CONNECTS TO UART0
Pin Name Board Location Pin Name Board Location
TXD J25-22 RXD J25-24
Prepare the Demo
Connect a micro USB cable between the host PC and the LPC-Link USB port (J27) 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!