1 files changed, 142 insertions, 0 deletions
diff --git a/nuttx/configs/stm32f3discovery/src/up_pwm.c b/nuttx/configs/stm32f3discovery/src/up_pwm.c
new file mode 100644
index 000000000..3c7fe0772
--- /dev/null
+++ b/nuttx/configs/stm32f3discovery/src/up_pwm.c
@@ -0,0 +1,142 @@
+/************************************************************************************
+ * configs/stm32f3discovery/src/up_pwm.c
+ * arch/arm/src/board/up_pwm.c
+ *
+ *   Copyright (C) 2011 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 <errno.h>
+#include <debug.h>
+
+#include <nuttx/pwm.h>
+#include <arch/board/board.h>
+
+#include "chip.h"
+#include "up_arch.h"
+#include "stm32_pwm.h"
+#include "stm32f3discovery-internal.h"
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+/* Configuration *******************************************************************/
+/* PWM
+ *
+ * The stm32f3discovery has no real on-board PWM devices, but the board can be configured to output
+ * a pulse train using TIM4 CH2.  This pin is used by FSMC is connect to CN5 just for this
+ * purpose:
+ *
+ * PD13 FSMC_A18 / MC_TIM4_CH2OUT pin 33 (EnB)
+ *
+ * FSMC must be disabled in this case!
+ */
+
+#define HAVE_PWM 1
+
+#ifndef CONFIG_PWM
+#  undef HAVE_PWM
+#endif
+
+#ifndef CONFIG_STM32_TIM4
+#  undef HAVE_PWM
+#endif
+
+#ifndef CONFIG_STM32_TIM4_PWM
+#  undef HAVE_PWM
+#endif
+
+#if CONFIG_STM32_TIM4_CHANNEL != STM32F3DISCOVERY_PWMCHANNEL
+#  undef HAVE_PWM
+#endif
+
+#ifdef HAVE_PWM
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: pwm_devinit
+ *
+ * Description:
+ *   All STM32 architectures must provide the following interface to work with
+ *   examples/pwm.
+ *
+ ************************************************************************************/
+
+int pwm_devinit(void)
+{
+  static bool initialized = false;
+  struct pwm_lowerhalf_s *pwm;
+  int ret;
+
+  /* Have we already initialized? */
+
+  if (!initialized)
+    {
+      /* Call stm32_pwminitialize() to get an instance of the PWM interface */
+
+      pwm = stm32_pwminitialize(STM32F3DISCOVERY_PWMTIMER);
+      if (!pwm)
+        {
+          dbg("Failed to get the STM32 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 */
+
+      initialized = true;
+    }
+
+  return OK;
+}
+
+#endif /* HAVE_PWM */