-- Raspberry Pi LPC1114 I/O Processor Expansion Board interrupt test program

-- Copyright (C)2013-2018, Philip Munts, President, Munts AM Corp.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are met:
--
-- * Redistributions of source code must retain the above copyright notice,
--   this list of conditions and the following disclaimer.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-- POSSIBILITY OF SUCH DAMAGE.

WITH Ada.Text_IO;           USE Ada.Text_IO;
WITH errno;                 USE errno;

WITH spi_agent.exceptions;  USE spi_agent.exceptions;
WITH spi_agent.gpio;        USE spi_agent.gpio;
WITH spi_agent.interrupt;   USE spi_agent.interrupt;
WITH spi_agent.pins;        USE spi_agent.pins;
WITH spi_agent.transport;   USE spi_agent.transport;

PROCEDURE test_int IS

  input_pin : GPIO;
  intr_pin  : Integer;
  error     : Integer;

BEGIN
  New_Line;
  Put_Line("Raspberry Pi LPC1114 I/O Processor Expansion Board Interrupt Test");
  New_Line;

  -- Initialize the SPI Agent Firmware transport library

  spi_agent.transport.open("ioctl://localhost" & ASCII.NUL, error);

  IF error /= 0 THEN
    RAISE SpiAgentError WITH
      "spi_agent.transport.open() failed, error:" & Integer'IMAGE(error);
  END IF;

  -- Configure an LPC1114 pin as input with pull-up, with interrupt enabled

  input_pin := Create(LPC1114_GPIO0, GPIO_INPUT, True);
  input_pin.ConfigureInterrupt(GPIO_INTERRUPT_FALLING);

  -- Enable interrupt monitoring on Raspberry Pi INT (GPIO4)

  interrupt_enable(error);

  IF error /= 0 THEN
    RAISE SpiAgentError WITH
      "interrupt_enable() failed, error:" & Integer'IMAGE(error);
  END IF;

  Put_Line("Press CONTROL-C to quit");
  New_Line;

  LOOP
    interrupt_wait(1000, intr_pin, error);

    CASE error IS
      WHEN EOK => -- poll() event received or timed out
        IF intr_pin /= 0 THEN
          Put_Line
           ("Received interrupt on GPIO pin" & Integer'IMAGE (intr_pin));
        END IF;

      WHEN EINTR => -- poll() interrupted by signal
        EXIT;

      WHEN OTHERS => -- poll() failed
        RAISE SpiAgentError WITH
          "interrupt_wait() failed, error:" & Integer'IMAGE(error);
    END CASE;
  END LOOP;

  New_Line;
  Put_Line("Terminating.");
  New_Line;

  -- Return the LPC1114 pin to default configuration

  input_pin.ConfigureMode(GPIO_MODE_INPUT_PULLUP);
  input_pin.ConfigureInterrupt(GPIO_INTERRUPT_DISABLED);

  -- Disable interrupt monitoring on Raspberry Pi INT (GPIO4)

  interrupt_disable(error);

  IF error /= 0 THEN
    RAISE SpiAgentError WITH
      "interrupt_disable() failed, error:" & Integer'IMAGE(error);
  END IF;

  -- Close the SPI Agent Firmware transport library

  spi_agent.transport.close(error);

  IF error /= 0 THEN
    RAISE SpiAgentError WITH
      "spi_agent.transport.close() failed, error:" & Integer'IMAGE(error);
  END IF;
END test_int;