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DsPIC Block/I2C Master

From - Simulink device driver Blockset for dsPIC / PIC24 / PIC32 Microcontrollers --[[User:LubinKerhuel|LubinKerhuel]] 12:40, 3 September 2009 (UTC)
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Block I2C Master

Input driver for I2C Peripheral

Provide acces to the I2C peripheral of the dsPIC (when available). The I2C bus sequence depends on the component being addressed. This sequence is configured very quickly with the 'sequence' parameter. The number of input and the number of output of the block is modified in order to match the sequence specification.

Dialog Box Parameters

I2C Master Dialog

Ref I2C

use either I2C 1 or I2C 2 if the dsPIC has two distinct I2C peripheral

Alternative I2C pin

This option is display when the dsPIC has an alternative I2C pin option. All I2C blocks must have the same configuration. Either this option is checked in all of the I2C blocks, neither none of them are checked. Mixing both will result in chosing randomly one of the PIN configuration and may also provide unexpected behaviour.


Specify the I2C bus sequence. The sequence is enterred as text, between single quote 'xxx'.

  • S : generate a start condition on the bus
  • Sr : generate a re-start condition on the bus
  • P : generate a stop condition on the bus
  • A and Axxx : send the address of the component of the bus. If followed by a decimal number (like A104) this number is taken as the address. Otherwise, a block input appear noted A1
  • W and Wxxx : write a data of type uint8 on the bus. If followed by a decimal number (like W82) this number is taken as the data being written. Otherwise, a block input noted W1 appears.
  • R and Rnack : Read a data of type uint8 on the bus. R generate an acknowledge. Rnack do not generate the acknowledge. A block output noted R1, R2 ... Rn appears for each R or Rnack present in the sequence.

Example of sequence : ' S A125 W R R P '


Define when the I2C peripheral is configured :

  • When PIC is initialized (only once)
  • When I2C bus is enable (if Enable I2C is checked)
  • Both
  • None

For simple schematic, use the first item.

Enable I2C peripheral before use

Enable or Re-enable the I2C peripheral. for simple model, the I2C bus is never disabled, this option can be unchecked.

==Wait after enable==Place a number or No OPerating (nop) instruction after re-enabling the I2C BUS. This is to avoid problems du to fast transition.

Disable I2C peripheral after use

to disable the I2C peripheral after use.

I2C bus frequency

Configure the I2C bus frequency. The I2C bus frequency Fscl is updated in the info part of the dialog each time this parameter is modified.

Slew rate active

Activate Slew rate

Enable SMB bus threshold

Enable SMB bus threshold

Output Error flag

Add an output to the block. This output will output 0 if no error occurs. 1 otherwise.

Sample Time

Sample time of the block. -1 for inherited

Block Ordering Input / Output

If you want to force the execution order of blocks that are not connected, this option allow to add either an input, an output or both to the block. These virtual connection allow to force the ordering of the blocks.


Information, give the clock frequency Fscl of the I2C bus.

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