I2C Controller Write
Write data to I2C peripheral device or I2C peripheral device register
Libraries:
Simulink Coder Support Package for BeagleBone Blue Hardware /
Communication
Description
Write data to an I2C peripheral device or an I2C peripheral device register. Using this block, you can also write data to a specific register on the I2C peripheral.
For more information on I2C Communication, refer to Support I2C Communication.To open the pin map of the BeagleBone® Bone Blue board, click the View pin map.
Ports
Input
Data — Input port to write data to I2C peripheral device register
[1xN] and [Nx1] array
The input port to write data to the I2C peripheral device or I2C peripheral device register.
Data Types: single
| double
| int8
| int16
| int32
| uint8
| uint16
| uint32
Output
Status — Status of write operation
scalar
Output port to display error status. For more information, see Output error status
Dependencies
This port appears only when you select the Output error status parameter.
Data Types: uint8
Parameters
Peripheral address — Address of I2C peripheral device
10 (default) | scalar
Enter the I2C peripheral device address to which you want to write the data. The I2C peripheral device address is a 7-bit address.
Specify this address as an integer or in hexadecimal format by using
hex2dec()
, for example hex2dec(‘61’).
Peripheral byte order — Byte order supported by the I2C peripheral device
BigEndian (default) | LittleEndian
Select the byte ordering that your I2C peripheral supports.
The two byte ordering options are:
Big Endian — The most significant byte is written first over the I2C bus. This option is the default option.
Little Endian — The least significant byte is written first over the I2C bus.
Enable register access — Option to enable writing to the register on I2C peripheral device
On (default) | Off
Select this check box to write data to a specific I2C peripheral register.
When you clear this parameter, the Send NACK at the end of data transfer and Remove stop bit at the end of data transfer parameters are displayed. Using these parameters, you can modify the write operation according to your requirements. For more information, see I2C Register Read/Write
Send NACK at the end of data transfer — Option to send Not Acknowledge bit at the end of data transfer
off (default) | on
When you select this parameter, the I2C Controller Write block sends a NACK (Not Acknowledge) bit to the peripheral device with the final byte.
When the peripheral device receives the NACK, it waits for a STOP condition from the I2C controller block. The controller block generates either a STOP condition to abort the transfer or a repeated START condition to start a new transfer.
When you clear this parameter, the I2C Controller Write block sends an ACK (Acknowledge) bit to the peripheral device at the end of every byte. The ACK indicates that the I2C Controller Write block is ready to read the next byte from the peripheral device.
Dependencies
This parameter appears only when you clear the Enable register access parameter.
Remove stop bit at the end of data transfer — Option to remove STOP bit at the end of data transfer
off (default) | on
When you clear this parameter, the block sends a STOP condition. This condition indicates that the block has terminated the data transmission and the I2C bus is free for any other I2C controller block to initiate the read/write operation.
When you select this parameter, the block sends another START condition followed by an address and read/write bit. The block sends any number of start conditions recursively. Such a repeated START condition allows write operations to the peripheral devices without releasing the bus. No other controller block interrupts the operation.
Dependencies
This parameter appears only when you clear the Enable register access parameter.
Peripheral register address — I2C peripheral device register address
0 (default) (default) | scalar
Enter the peripheral device register address to which you want to write the data.
Dependencies
This parameter is enabled only when you select the Enable register access parameter.
Output error status — Option to display output error status
Off (default) | On
Select this option to display the output error status. When you select this
parameter, the block configures an output port. The port on the block is labeled as
Status
, indicating that the block outputs the status of the write
operation at the output port.
The block outputs the status as a uint8
value. Each value
corresponds to a data transfer status.
Status value | Status description |
---|---|
0 | SUCCESS |
1 | BUSY |
2 | ARBITRATION_LOST |
4 | NO_ACKNOWLEDGE |
8 | BUS_ERROR |
16 | BUS_NOT_IN_USE |
Version History
Introduced in R2018b
See Also
MATLAB 命令
您点击的链接对应于以下 MATLAB 命令:
请在 MATLAB 命令行窗口中直接输入以执行命令。Web 浏览器不支持 MATLAB 命令。
Select a Web Site
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list:
How to Get Best Site Performance
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.
Americas
- América Latina (Español)
- Canada (English)
- United States (English)
Europe
- Belgium (English)
- Denmark (English)
- Deutschland (Deutsch)
- España (Español)
- Finland (English)
- France (Français)
- Ireland (English)
- Italia (Italiano)
- Luxembourg (English)
- Netherlands (English)
- Norway (English)
- Österreich (Deutsch)
- Portugal (English)
- Sweden (English)
- Switzerland
- United Kingdom (English)