Mikroelektronika MIKROE-724 データシート

mikroBasic PRO for dsPIC30/33 and PIC24

MikroElektronika

453

Soft_I2C_Break

sub procedure Soft_I2C_Break()

Description All Software I²C Library functions can block the program flow (see note at the top of this page). Calling 

this routine from interrupt will unblock the program execution. This mechanism is similar to WDT.

Parameters None.
Returns

Nothing.

Nothing. 

dim data1, error, counter as byte

sub procedure Timer1Int() org IVT_ADDR_T1INTERRUPT

  counter = 0

  if (counter >= 20)

    Soft_I2C_Break()

    counter = 0                ‘ reset counter

  else

    Inc(counter)               ‘ increment counter

  end if

 

  T1IF_bit = 0                 ‘ Clear Timer1 overflow interrupt flag

main:

  ...

  ‘ try Soft_I2C_Init with blocking prevention mechanism

  IPC0   = IPC0 or 0x1000      ‘ Interrupt priority level = 1 

  T1IE_bit = 1                 ‘ Enable Timer1 interrupts

  T1CON = 0x8030     ‘ Timer1 ON, internal clock FCY, prescaler 1:256

  Soft_I2C_Init()

  T1IE_bit = 0                 ‘ Disable Timer1 interrupts

Interrupts should be disabled before using Software I²C routines again (see note at the top of this 

page).