diff --git a/configs/nucleo-l432kc/src/stm32_zerocross.c b/configs/nucleo-l432kc/src/stm32_zerocross.c
new file mode 100644
index 00000000000..5415793be87
--- /dev/null
+++ b/configs/nucleo-l432kc/src/stm32_zerocross.c
@@ -0,0 +1,194 @@
+/****************************************************************************
+ * configs/nucleo-l432kc/src/stm32_zerocross.c
+ *
+ *   Copyright (C) 2018-2019 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <stdint.h>
+#include <debug.h>
+
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+#include <nuttx/sensors/zerocross.h>
+
+#include "stm32l4_gpio.h"
+#include "nucleo-l432kc.h"
+
+#ifdef CONFIG_SENSORS_ZEROCROSS
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static void zcross_enable(FAR const struct zc_lowerhalf_s *lower,
+                          zc_interrupt_t handler, FAR void *arg);
+
+static void zcross_disable(void);
+static int  zcross_interrupt(int irq, FAR void *context, FAR void *arg);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/* Current interrupt handler and argument */
+
+static zc_interrupt_t g_zcrosshandler;
+static FAR void *g_zcrossarg;
+
+/* This is the zero cross lower half driver interface */
+
+static struct zc_lowerhalf_s g_zcrosslower =
+{
+  .zc_enable = zcross_enable,
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: zcross_enable
+ *
+ * Description:
+ *   Enable interrupts on the selected zero cross pin.  And empty
+ *   set will disable all interrupts.
+ *
+ ****************************************************************************/
+
+static void zcross_enable(FAR const struct zc_lowerhalf_s *lower,
+                          zc_interrupt_t handler, FAR void *arg)
+{
+  irqstate_t flags;
+  bool rising = false;
+  bool falling = true;
+
+  /* Start with all interrupts disabled */
+
+  flags = enter_critical_section();
+  zcross_disable();
+
+  sninfo("handler: %p arg: %p\n", handler, arg);
+
+  if (handler)
+    {
+      g_zcrosshandler = handler;
+      g_zcrossarg     = arg;
+    }
+
+  (void)stm32l4_gpiosetevent(GPIO_ZEROCROSS, rising, falling,
+                           true, zcross_interrupt, NULL);
+
+  leave_critical_section(flags);
+}
+
+/****************************************************************************
+ * Name: zcross_disable
+ *
+ * Description:
+ *   Disable zero cross interrupts
+ *
+ ****************************************************************************/
+
+static void zcross_disable(void)
+{
+  irqstate_t flags;
+
+  /* Disable zero cross pin interrupt */
+
+  flags = enter_critical_section();
+
+  (void)stm32l4_gpiosetevent(GPIO_ZEROCROSS, false, false, false, NULL, NULL);
+
+  leave_critical_section(flags);
+
+  /* Nullify the handler and argument */
+
+  g_zcrosshandler = NULL;
+  g_zcrossarg     = NULL;
+}
+
+/****************************************************************************
+ * Name: zcross_interrupt
+ *
+ * Description:
+ *   Zero Cross interrupt handler
+ *
+ ****************************************************************************/
+
+static int zcross_interrupt(int irq, FAR void *context, FAR void *arg)
+{
+  DEBUGASSERT(g_zcrosshandler != NULL);
+  if (g_zcrosshandler)
+    {
+      g_zcrosshandler(&g_zcrosslower, g_zcrossarg);
+    }
+
+  return OK;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stm32_zerocross_initialize
+ *
+ * Description:
+ *   Initialize and register the zero cross driver
+ *
+ ****************************************************************************/
+
+int stm32_zerocross_initialize(void)
+{
+  /* Configure the GPIO pin as input.    NOTE: This is unnecessary for
+   * interrupting pins since it will also be done by stm32l4_gpiosetevent().
+   */
+
+  stm32l4_configgpio(GPIO_ZEROCROSS);
+
+  /* Make sure that all interrupts are disabled */
+
+  zcross_disable();
+
+  /* Register the zero cross device as /dev/zc0 */
+
+  return zc_register("/dev/zc0", &g_zcrosslower);
+}
+
+#endif /* CONFIG_SENSORS_ZEROCROSS */
+