.. currentmodule:: pyb

class ExtInt -- configure I/O pins to interrupt on external events

There are a total of 22 interrupt lines. 16 of these can come from GPIO pins and the remaining 6 are from internal sources.

For lines 0 through 15, a given line can map to the corresponding line from an arbitrary port. So line 0 can map to Px0 where x is A, B, C, ... and line 1 can map to Px1 where x is A, B, C, ...

def callback(line):
 print("line =", line)

Note: ExtInt will automatically configure the gpio line as an input.

extint = pyb.ExtInt(pin, pyb.ExtInt.IRQ_FALLING, pyb.Pin.PULL_UP, callback)

Now every time a falling edge is seen on the X1 pin, the callback will be called. Caution: mechanical pushbuttons have "bounce" and pushing or releasing a switch will often generate multiple edges. See: Constructors

Create an ExtInt object:

• pin is the pin on which to enable the interrupt (can be a pin object or any valid pin name).
• mode can be one of: - ExtInt.IRQ_RISING - trigger on a rising edge; - ExtInt.IRQ_FALLING - trigger on a falling edge; - ExtInt.IRQ_RISING_FALLING - trigger on a rising or falling edge.
• pull can be one of: - pyb.Pin.PULL_NONE - no pull up or down resistors; - pyb.Pin.PULL_UP - enable the pull-up resistor; - pyb.Pin.PULL_DOWN - enable the pull-down resistor.
• callback is the function to call when the interrupt triggers. The callback function must accept exactly 1 argument, which is the line that triggered the interrupt.

Class methods

.. classmethod:: ExtInt.regs()

 Dump the values of the EXTI registers.

Methods

.. method:: ExtInt.disable()

 Disable the interrupt associated with the ExtInt object.
 This could be useful for debouncing.

.. method:: ExtInt.enable()

 Enable a disabled interrupt.

.. method:: ExtInt.line()

 Return the line number that the pin is mapped to.

.. method:: ExtInt.swint()

 Trigger the callback from software.

Constants

.. data:: ExtInt.IRQ_FALLING

 interrupt on a falling edge

.. data:: ExtInt.IRQ_RISING

 interrupt on a rising edge

.. data:: ExtInt.IRQ_RISING_FALLING

 interrupt on a rising or falling edge

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