tinySA/demos/ARM7-LPC214x-G++/main.cpp

/*
    ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    ChibiOS/RT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <ch.hpp>
#include <pal.h>

#include <evtimer.h>
#include <test.h>

#include <board.h>
#include <lpc214x_serial.h>

#define BOTH_BUTTONS (PAL_PORT_BIT(PA_BUTTON1) | PAL_PORT_BIT(PA_BUTTON2))

using namespace chibios_rt;

/*
 * LED blink sequences.
 * NOTE: Sequences must always be terminated by a GOTO instruction.
 * NOTE: The sequencer language could be easily improved but this is outside
 *       the scope of this demo.
 */
#define SLEEP           0
#define GOTO            1
#define STOP            2
#define BITCLEAR        3
#define BITSET          4

typedef struct {
  uint8_t       action;
  uint32_t      value;
} seqop_t;

// Flashing sequence for LED1.
static const seqop_t LED1_sequence[] =
{
  {BITCLEAR, PAL_PORT_BIT(PA_LED1)},
  {SLEEP,    200},
  {BITSET,   PAL_PORT_BIT(PA_LED1)},
  {SLEEP,    1800},
  {GOTO,     0}
};

// Flashing sequence for LED2.
static const seqop_t LED2_sequence[] =
{
  {SLEEP,    1000},
  {BITCLEAR, PAL_PORT_BIT(PA_LED2)},
  {SLEEP,    200},
  {BITSET,   PAL_PORT_BIT(PA_LED2)},
  {SLEEP,    1800},
  {GOTO,     1}
};

// Flashing sequence for LED3.
static const seqop_t LED3_sequence[] =
{
  {BITCLEAR, PAL_PORT_BIT(PA_LEDUSB)},
  {SLEEP,    200},
  {BITSET,   PAL_PORT_BIT(PA_LEDUSB)},
  {SLEEP,    300},
  {GOTO,     0}
};

/*
 * Sequencer thread class. It can drive LEDs or other output pins.
 * Any sequencer is just an instance of this class, all the details are
 * totally encapsulated and hidden to the application level.
 */
class SequencerThread : public EnhancedThread<128> {
private:
  const seqop_t *base, *curr;                   // Thread local variables.

protected:
  virtual msg_t Main(void) {
    while (true) {
      switch(curr->action) {
      case SLEEP:
        Sleep(curr->value);
        break;
      case GOTO:
        curr = &base[curr->value];
        continue;
      case STOP:
        return 0;
      case BITCLEAR:
        palClearPort(IOPORT_A, curr->value);
        break;
      case BITSET:
        palSetPort(IOPORT_A, curr->value);
        break;
      }
      curr++;
    }
  }

public:
  SequencerThread(const seqop_t *sequence) : EnhancedThread<128>("sequencer") {

    base = curr = sequence;
  }
};

/*
 * Tester thread class. This thread executes the test suite.
 */
class TesterThread : public EnhancedThread<128> {

protected:
  virtual msg_t Main(void) {

    return TestThread(&COM1);
  }

public:
  TesterThread(void) : EnhancedThread<128>("tester") {
  }
};

/*
 * Executed as an event handler at 500mS intervals.
 */
static void TimerHandler(eventid_t id) {

  if (!(palReadPort(IOPORT_A) & BOTH_BUTTONS)) { // Both buttons
    TesterThread tester;
    tester.Wait();
  };
}

/*
 * Entry point, note, the main() function is already a thread in the system
 * on entry.
 */
int main(int argc, char **argv) {
  static const evhandler_t evhndl[] = {
    TimerHandler
  };
  static EvTimer evt;
  struct EventListener el0;

  evtInit(&evt, 500);                   // Initializes an event timer.
  evtStart(&evt);                       // Starts the event timer.
  chEvtRegister(&evt.et_es, &el0, 0);   // Registers a listener on the source.

  /*
   * Starts several instances of the SequencerThread class, each one operating
   * on a different LED.
   */
  SequencerThread blinker1(LED1_sequence);
  SequencerThread blinker2(LED2_sequence);
  SequencerThread blinker3(LED3_sequence);

  /*
   * Serves timer events.
   */
  while (true)
    Event::Dispatch(evhndl, Event::WaitOne(ALL_EVENTS));

  return 0;
}