register each enabled timer

configs/teensy-3.x/src/Makefile

 ############################################################################
 # configs/teensy-3.x/src/Makefile
 #
-#   Copyright (C) 2015 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2015,2016 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -51,4 +51,8 @@ ifeq ($(CONFIG_LIB_BOARDCTL),y)
 CSRCS += k20_appinit.c
 endif
 
+ifeq ($(CONFIG_PWM),y)
+CSRCS += k20_pwm.c
+endif
+
 include $(TOPDIR)/configs/Board.mk

configs/teensy-3.x/src/k20_pwm.c

+/************************************************************************************
+ * configs/teensy-3.x/src/k20_pwm.c
+ *
+ *   Copyright (C) 2015,2016 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *           Alan Carvalho de Assis <acassis@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * 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 OWNER 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.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/board.h>
+#include <nuttx/pwm.h>
+
+#include <arch/board/board.h>
+
+#include "chip.h"
+#include "up_arch.h"
+#include "kinetis_pwm.h"
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+/* Configuration *******************************************************************/
+/* PWM
+ *
+ * The Kinetis Freedom board provides a LED on GPIO.
+ */
+
+#ifdef CONFIG_PWM
+
+extern struct pwm_lowerhalf_s *kinetis_pwminitialize(int timer);
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: board_pwm_setup
+ *
+ * Description:
+ *   All Kinetis K20 architectures must provide the following interface to work with
+ *   examples/pwm.
+ *
+ ************************************************************************************/
+
+int board_pwm_setup(void)
+{
+  static bool initialized = false;
+  struct pwm_lowerhalf_s *pwm;
+  int ret;
+
+  /* Have we already initialized? */
+
+  if (!initialized)
+    {
+      /* Call kinetis_pwminitialize() to get an instance of the PWM interface */
+#ifdef CONFIG_KINETIS_FTM0_PWM
+      pwm = kinetis_pwminitialize(0);
+      if (!pwm)
+        {
+          adbg("Failed to get the KL20 PWM lower half\n");
+          return -ENODEV;
+        }
+
+      /* Register the PWM driver at "/dev/pwm0" */
+
+      ret = pwm_register("/dev/pwm0", pwm);
+      if (ret < 0)
+        {
+          adbg("pwm_register failed: %d\n", ret);
+          return ret;
+        }
+
+      /* Now we are initialized */
+#endif
+#ifdef CONFIG_KINETIS_FTM1_PWM
+      pwm = kinetis_pwminitialize(1);
+      if (!pwm)
+        {
+          adbg("Failed to get the KL20 PWM lower half\n");
+          return -ENODEV;
+        }
+
+      /* Register the PWM driver at "/dev/pwm1" */
+
+      ret = pwm_register("/dev/pwm1", pwm);
+      if (ret < 0)
+        {
+          adbg("pwm_register failed: %d\n", ret);
+          return ret;
+        }
+
+      /* Now we are initialized */
+#endif
+#ifdef CONFIG_KINETIS_FTM2_PWM
+      pwm = kinetis_pwminitialize(2);
+      if (!pwm)
+        {
+          adbg("Failed to get the KL20 PWM lower half\n");
+          return -ENODEV;
+        }
+
+      /* Register the PWM driver at "/dev/pwm2" */
+
+      ret = pwm_register("/dev/pwm2", pwm);
+      if (ret < 0)
+        {
+          adbg("pwm_register failed: %d\n", ret);
+          return ret;
+        }
+
+      /* Now we are initialized */
+#endif
+      initialized = true;
+    }
+
+  return OK;
+}
+
+#endif /* CONFIG_PWM */