/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012,2013 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.h"
#include "hal.h"
#include "test.h"

#include "chprintf.h"
#include "shell.h"

#include "usbcfg.h"

/* Virtual serial port over USB.*/
static SerialUSBDriver SDU2;

/*===========================================================================*/
/* Command line related.                                                     */
/*===========================================================================*/

#define SHELL_WA_SIZE   THD_WA_SIZE(2048)
#define TEST_WA_SIZE    THD_WA_SIZE(256)

static void cmd_mem(BaseSequentialStream *chp, int argc, char *argv[]) {
  size_t n, size;

  (void)argv;
  if (argc > 0) {
    chprintf(chp, "Usage: mem\r\n");
    return;
  }
  n = chHeapStatus(NULL, &size);
  chprintf(chp, "core free memory : %u bytes\r\n", chCoreStatus());
  chprintf(chp, "heap fragments   : %u\r\n", n);
  chprintf(chp, "heap free total  : %u bytes\r\n", size);
}

static void cmd_threads(BaseSequentialStream *chp, int argc, char *argv[]) {
  static const char *states[] = {THD_STATE_NAMES};
  Thread *tp;

  (void)argv;
  if (argc > 0) {
    chprintf(chp, "Usage: threads\r\n");
    return;
  }
  chprintf(chp, "    addr    stack prio refs     state time\r\n");
  tp = chRegFirstThread();
  do {
    chprintf(chp, "%.8lx %.8lx %4lu %4lu %9s %lu\r\n",
            (uint32_t)tp, (uint32_t)tp->p_ctx.r13,
            (uint32_t)tp->p_prio, (uint32_t)(tp->p_refs - 1),
            states[tp->p_state], (uint32_t)tp->p_time);
    tp = chRegNextThread(tp);
  } while (tp != NULL);
}

static void cmd_test(BaseSequentialStream *chp, int argc, char *argv[]) {
  Thread *tp;

  (void)argv;
  if (argc > 0) {
    chprintf(chp, "Usage: test\r\n");
    return;
  }
  tp = chThdCreateFromHeap(NULL, TEST_WA_SIZE, chThdGetPriority(),
                           TestThread, chp);
  if (tp == NULL) {
    chprintf(chp, "out of memory\r\n");
    return;
  }
  chThdWait(tp);
}

static const ShellCommand commands[] = {
  {"mem", cmd_mem},
  {"threads", cmd_threads},
  {"test", cmd_test},
  {NULL, NULL}
};

static const ShellConfig shell_cfg1 = {
  (BaseSequentialStream *)&SDU2,
  commands
};


/*
 * Debug output and heartbeat thread.
 */
static WORKING_AREA(waThread1, 128);
static msg_t Thread1(void *arg) {
  (void)arg;
  systime_t time;

  chRegSetThreadName("reader");

#if STM32_SERIAL_USE_USART2
  BaseSequentialStream *chp = (BaseSequentialStream *)&SD2;
#endif
#if STM32_SERIAL_USE_USART3
  BaseSequentialStream *chp = (BaseSequentialStream *)&SD3;
#endif

  /* Blinky Light Loop */
  palTogglePad(GPIOH, GPIOH_LED1);
  palTogglePad(GPIOH, GPIOH_LED2);

  while (TRUE) {
    time = chTimeNow();
    chprintf(chp, "Toggling LEDs: %u\r\n", time);
    palTogglePad(GPIOH, GPIOH_LED1);
    palTogglePad(GPIOH, GPIOH_LED2);
    palTogglePad(GPIOI, GPIOI_LED3);
    palTogglePad(GPIOI, GPIOI_LED4);

    chThdSleep(MS2ST(500));
  }
}

/*===========================================================================*/
/* Initialization and main thread.                                           */
/*===========================================================================*/

/*
 * Application entry point.
 */
int main(void) {
  Thread *shelltp = NULL;

  /*
   * System initializations.
   * - HAL initialization, this also initializes the configured device drivers
   *   and performs the board-specific initializations.
   * - Kernel initialization, the main() function becomes a thread and the
   *   RTOS is active.
   */
  halInit();
  chSysInit();

  /*
   * Shell manager initialization.
   */
  shellInit();

  /*
   * Initializes a serial-over-USB CDC driver.
   */
  sduObjectInit(&SDU2);
  sduStart(&SDU2, &serusbcfg);

  /*
   * Activates the USB driver and then the USB bus pull-up on D+.
   * Note, a delay is inserted in order to not have to disconnect the cable
   * after a reset.
   */
  usbDisconnectBus(serusbcfg.usbp);
  chThdSleepMilliseconds(1000);
  usbStart(serusbcfg.usbp, &usbcfg);
  usbConnectBus(serusbcfg.usbp);

  /*
   * Activates the serial driver 2 using the driver default configuration.
   * PA2(TX) and PA3(RX) are routed to USART2.
   */
#if STM32_SERIAL_USE_USART2
  sdStart(&SD2, NULL);
  palSetPadMode(GPIOA, 2, PAL_MODE_ALTERNATE(7));
  palSetPadMode(GPIOA, 3, PAL_MODE_ALTERNATE(7));
#endif

#if STM32_SERIAL_USE_USART3
  sdStart(&SD3, NULL);
  palSetPadMode(GPIOC, 10, PAL_MODE_ALTERNATE(7));
  palSetPadMode(GPIOC, 11, PAL_MODE_ALTERNATE(7));
#endif


  /*
   * Creates the example thread.
   */
  chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO + 10, Thread1, NULL);

  /*
   * Normal main() thread activity, in this demo it just performs
   * a shell respawn upon its termination.
   */
  while (TRUE) {
    if (!shelltp) {
      if (SDU2.config->usbp->state == USB_ACTIVE) {
        /* Spawns a new shell.*/
        shelltp = shellCreate(&shell_cfg1, SHELL_WA_SIZE, NORMALPRIO);
      }
    }
    else {
      /* If the previous shell exited.*/
      if (chThdTerminated(shelltp)) {
        /* Recovers memory of the previous shell.*/
        chThdRelease(shelltp);
        shelltp = NULL;
      }
    }
    chThdSleepMilliseconds(500);
  }
}