In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

I found a 24LC16B in my stash and updated the program from the help file so that MEM_OUT does not return until the write-cycle is complete.  Here's the update:

[code]' Use: MEM_OUT address, value
' -- writes 'value' to 24LC16B location at 'address'
' -- "address" is a word (two bytes required)
' -- "value" is a byte

MEM_OUT:
  tmpW1 = __WPARAM12                            ' copy address
  tmpB1 = __PARAM3                              ' copy value

  I2CSTART SDA
  tmpW1_MSB = tmpW1_MSB & $03                   ' get block value
  tmpW1_MSB = tmpW1_MSB << 1
  tmpW1_MSB = tmpW1_MSB | SlaveID               ' create control byte
  tmpW1_MSB.0 = 0                               ' set RW bit for write
  I2CSEND SDA, tmpW1_MSB                        ' send slave ID
  I2CSEND SDA, tmpW1_LSB                        ' send word address
  I2CSEND SDA, tmpB1                            ' send data byte
  I2CSTOP SDA                                   ' finish
  DO                                            ' let write cycle finish
    I2CSTART SDA
    I2CSEND SDA, tmpW1_MSB, ackBit              ' resend slave ID
  LOOP UNTIL ackBit = Ack
  RETURN[/code]

You could use conditional compilation to disable the write-delay, and if you're going to be using I2C is a large application its a good idea to encapsulate the core I2C commands in custom subroutines and functions; I2C has a timing element to is and, therefore, generates a bit of code.

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