Difference between revisions of "DcAN I/O Interface"

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==Send Display Data==
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==Write Display Pixel Data==
 
<ul>
 
<ul>
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<li>Each element of the I2C Read Response Packet is a 16 bit unsigned integer</li>
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<li>Each element of the Write Display Data Packet is a 16 bit unsigned integer</li>
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<li>The first 16 bit word of the packet represents the unique identifier and must be equal to 0x302</li>
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<li>The first 16 bit word of the packet represents the unique identifier and must be equal to 0x304</li>
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<li>An I2C Read Response Packet is sent to the client in response to an I2C Read Request</li>
 
 
</ul>
 
</ul>
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! width="100" bgcolor="#CCCCCC" |Byte Offset
 
! width="100" bgcolor="#CCCCCC" |Byte Offset
 
! width="280" bgcolor="#CCCCCC" |Element
 
! width="280" bgcolor="#CCCCCC" |Element
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|-
 
|-
 
! bgcolor="#CCCCCC" |0
 
! bgcolor="#CCCCCC" |0
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| bgcolor="#FFBBBB" |0x302
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| bgcolor="#FFBBBB" |0x304
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|-
 
|-
 
! bgcolor="#CCCCCC" |2
 
! bgcolor="#CCCCCC" |2
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| bgcolor="#FFBBBB" |Request ID
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| bgcolor="#FFBBBB" |I2C Bus ID
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|-
 
|-
 
! bgcolor="#CCCCCC" |4
 
! bgcolor="#CCCCCC" |4
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| bgcolor="#FFBBBB" |I2C Bus ID
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| bgcolor="#FFBBBB" |I2C Address
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|-
 
|-
 
! bgcolor="#CCCCCC" |6
 
! bgcolor="#CCCCCC" |6
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| bgcolor="#FFBBBB" |# Bytes Returned
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| bgcolor="#FFBBBB" |Beginning Pixel Column
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|-
 
|-
 
! bgcolor="#CCCCCC" |8
 
! bgcolor="#CCCCCC" |8
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| bgcolor="#FFBBBB" |Data Returned from I2C
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| bgcolor="#FFBBBB" |Beginning Pixel Row
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|-
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! bgcolor="#CCCCCC" |10
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| bgcolor="#FFBBBB" |Total Number of Pixel Columns
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|-
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! bgcolor="#CCCCCC" |12
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| bgcolor="#FFBBBB" |Total Number of Pixel Rows
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|-
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! bgcolor="#CCCCCC" |14
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| bgcolor="#FFBBBB" |Array of Pixel Columns and Rows
  
 
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Revision as of 14:25, 26 September 2019

Data can be passed between a client and a DcAN I/O device through the DcAN I/O Interface. Packets are sent through a TCP/IP port. The following rules apply:

  • The I/O device shall listen for TCP/IP connections on IP port number 33001
  • A maximum of 3 clients can simultaneously connect to the DcAN I/O Interface port
  • All elements of each packet shall be in network byte order

The following sections define the packets that are valid for the DcAN I/O Interface


I2C Read Request

  • Each element of the I2C Read Request Packet is a 16 bit unsigned integer
  • The first 16 bit word of the packet represents the unique identifier and must be equal to 0x301
  • An I2C Read Response Packet with the requested data will be sent back to the client in response to each I2C Read Request


Byte Offset Element Notes
0 0x301
2 Request ID Arbitrary value that will be sent back in the response
4 I2C Bus ID 0=I2C Bus 'A'
1=I2C Bus 'B'
6 # Bytes to Read
8 I2C Address
10 Read Mode 0=One-time read
1=Periodic
2=On Change + Periodic
12 Periodic Read Frequency millseconds

I2C Read Response

  • Each element of the I2C Read Response Packet is a 16 bit unsigned integer
  • The first 16 bit word of the packet represents the unique identifier and must be equal to 0x302
  • An I2C Read Response Packet is sent to the client in response to an I2C Read Request


Byte Offset Element
0 0x302
2 Request ID
4 I2C Bus ID
6 # Bytes Returned
8 Data Returned from I2C

Write Display Pixel Data

  • Each element of the Write Display Data Packet is a 16 bit unsigned integer
  • The first 16 bit word of the packet represents the unique identifier and must be equal to 0x304
Byte Offset Element
0 0x304
2 I2C Bus ID
4 I2C Address
6 Beginning Pixel Column
8 Beginning Pixel Row
10 Total Number of Pixel Columns
12 Total Number of Pixel Rows
14 Array of Pixel Columns and Rows
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