cmsis_i2c_read_accel_value_transfer#
Overview#
CMSIS-Driver defines generic peripheral driver interfaces for middleware making it reusable across a wide range of supported microcontroller devices. The API connects microcontroller peripherals with middleware that implements for example communication stacks, file systems, or graphic user interfaces. More information and usage method please refer to http://www.keil.com/pack/doc/cmsis/Driver/html/index.html.
The cmsis_i2c_read_accel_value example shows how to use CMSIS I2C driver to communicate with an i2c device:
How to use the i2c driver to read a i2c device who_am_I register.
How to use the i2c driver to write/read the device registers.
In this example, the values of three-axis accelerometer print to the serial terminal on PC through the virtual serial port on board.
Supported Boards#
FRDM-K22F
Hardware requirements
Mini/Micro USB cable
FRDM-K22F board
Personal Computer
Board settings
No special is needed.
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.
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 example runs successfully, you can see the similar information from the terminal as below.
I2C example – Read Accelerometer Value Found an FXOS8700 on board , the device address is 0x1d . The accel values: status_reg = 0xff , x = -10 , y = 31 , z = 2025 status_reg = 0xff , x = -6 , y = 32 , z = 2022 status_reg = 0xff , x = -9 , y = 35 , z = 2023 status_reg = 0xff , x = -4 , y = 32 , z = 2034 status_reg = 0xff , x = -12 , y = 32 , z = 2020 status_reg = 0xff , x = -8 , y = 33 , z = 2022 status_reg = 0xff , x = -8 , y = 33 , z = 2017 status_reg = 0xff , x = -9 , y = 35 , z = 2024 status_reg = 0xff , x = -7 , y = 35 , z = 2018 status_reg = 0xff , x = -5 , y = 33 , z = 2019
End of I2C example .
FRDM-K32L2B
Hardware requirements
Mini/Micro USB cable
FRDM-K32L2B board
Personal Computer
Board settings
FXOS8700 must be available on board to run this example. If it’s not soldered, the example cannot work.
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.
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 example runs successfully, you can see the similar information from the terminal as below.
I2C example – Read Accelerometer Value Found an FXOS8700 on board , the device address is 0x1c . The accel values: status_reg = 0xff , x = -10 , y = 31 , z = 2025 status_reg = 0xff , x = -6 , y = 32 , z = 2022 status_reg = 0xff , x = -9 , y = 35 , z = 2023 status_reg = 0xff , x = -4 , y = 32 , z = 2034 status_reg = 0xff , x = -12 , y = 32 , z = 2020 status_reg = 0xff , x = -8 , y = 33 , z = 2022 status_reg = 0xff , x = -8 , y = 33 , z = 2017 status_reg = 0xff , x = -9 , y = 35 , z = 2024 status_reg = 0xff , x = -7 , y = 35 , z = 2018 status_reg = 0xff , x = -5 , y = 33 , z = 2019
End of I2C example .
FRDM-KE02Z40M
Hardware requirements
Mini USB cable
FRDM-KE02Z40M board
Personal Computer
Board settings
No special is needed.
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.
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 example runs successfully, you can see the similar information from the terminal as below.
I2C example – Read Accelerometer Value Found an MMA8451 on board , the device address is 0x1d . The accel values: status_reg = 0xff , x = 220 , y = 616 , z = 1946 status_reg = 0xff , x = 222 , y = 617 , z = 1937 status_reg = 0xff , x = 217 , y = 615 , z = 1941 status_reg = 0xff , x = 220 , y = 620 , z = 1941 status_reg = 0xff , x = 219 , y = 617 , z = 1933 status_reg = 0xff , x = 221 , y = 614 , z = 1933 status_reg = 0xff , x = 219 , y = 618 , z = 1933 status_reg = 0xff , x = 220 , y = 621 , z = 1936 status_reg = 0xff , x = 221 , y = 616 , z = 1939 status_reg = 0xff , x = 219 , y = 617 , z = 1945
End of I2C example .
TWR-KM34Z50MV3
Hardware requirements
Mini USB cable
TWR-KM34Z50MV3 board
Personal Computer
Board settings
No special settings are required.
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.
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, similar message will be displayed in the terminal:
I2C example – Read Accelerometer Value Found MMA8491 on board, the device address is 0x55. The accel values: status_reg = 0xf , x = -26 , y = 29 , z = 1036 status_reg = 0xf , x = -7 , y = -6 , z = 1017 status_reg = 0xf , x = -4 , y = 43 , z = 1031 status_reg = 0xf , x = -22 , y = 33 , z = 1035 status_reg = 0xf , x = -18 , y = 35 , z = 1020 status_reg = 0xf , x = 2 , y = 11 , z = 1029 status_reg = 0xf , x = -10 , y = 34 , z = 1029 status_reg = 0xf , x = 1 , y = 15 , z = 1016 status_reg = 0xf , x = -8 , y = 41 , z = 1041 status_reg = 0xf , x = -21 , y = 20 , z = 1045
End of I2C example .
TWR-KM34Z75M
Hardware requirements
Mini/Micro USB cable
TWR-KM34Z75M board
Personal Computer
Board settings
No special is needed.
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.
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 example runs successfully, you can see the similar information from the terminal as below.
I2C example – Read Accelerometer Value Found an FXOS8700 on board , the device address is 0x1c . The accel values: status_reg = 0xff , x = 63 , y = 82 , z = 2068 status_reg = 0xff , x = 58 , y = 88 , z = 2079 status_reg = 0xff , x = 62 , y = 79 , z = 2095 status_reg = 0xff , x = 64 , y = 91 , z = 2088 status_reg = 0xff , x = 59 , y = 90 , z = 2089 status_reg = 0xff , x = 63 , y = 78 , z = 2073 status_reg = 0xff , x = 57 , y = 89 , z = 2083 status_reg = 0xff , x = 63 , y = 81 , z = 2091 status_reg = 0xff , x = 63 , y = 89 , z = 2086 status_reg = 0xff , x = 59 , y = 87 , z = 2082
End of I2C example .
TWR-KM35Z75M
Hardware requirements
Micro USB cable
TWR-KM35Z75M board
Personal Computer
Board settings
No special is needed.
Prepare the Demo
Connect a Micro 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.
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 example runs successfully, you can see the similar information from the terminal as below.
I2C example – Read Accelerometer Value Found an FXOS8700 on board , the device address is 0x1c . The accel values: status_reg = 0xff , x = 63 , y = 82 , z = 2068 status_reg = 0xff , x = 58 , y = 88 , z = 2079 status_reg = 0xff , x = 62 , y = 79 , z = 2095 status_reg = 0xff , x = 64 , y = 91 , z = 2088 status_reg = 0xff , x = 59 , y = 90 , z = 2089 status_reg = 0xff , x = 63 , y = 78 , z = 2073 status_reg = 0xff , x = 57 , y = 89 , z = 2083 status_reg = 0xff , x = 63 , y = 81 , z = 2091 status_reg = 0xff , x = 63 , y = 89 , z = 2086 status_reg = 0xff , x = 59 , y = 87 , z = 2082
End of I2C example .