STM32: make PWM driver into a common file

The pwmout driver is very similar for each STM32 family.

The only family specific part is defined in pwmout_device.h file.
It mainly contains few specific information:
- The mapping of PWM/TIMERS to APB1 or APB2 so that we can get the clock
- The clock calculation uses the right APB clock, which was sometimes
not the case before and could have lead to errors in case dividers were
enabled on APB clock settings. This case is now covered.
- Inactivation of inverted support on feaw families

Author: LMESTM

targets/TARGET_STM/TARGET_STM32F0/pwmout_api.c

@@ -0,0 +1,83 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2017, STMicroelectronics
+ * All rights reserved.
+ *
+ * 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 of STMicroelectronics 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 HOLDER 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.
+ *******************************************************************************
+ */
+#ifndef MBED_PWMOUT_DEVICE_H
+#define MBED_PWMOUT_DEVICE_H
+
+#include "cmsis.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef DEVICE_PWMOUT
+
+typedef enum {
+    PWMOUT_ON_APB1 = 0,
+    PWMOUT_UNKNOWN = 1
+} PwmoutApb;
+
+/*  Structure to describe Timers to APB */
+typedef struct pwm_apb_map {
+    PWMName pwm;   // an index entry for each EXIT line
+    PwmoutApb pwmoutApb;
+} pwm_apb_map_t;
+
+/*  there is only 1 APB clock in F0 family */
+#define PWMOUT_APB2_NOT_SUPPORTED
+
+static const pwm_apb_map_t pwm_apb_map_table[] =
+{
+#if defined(TIM2_BASE)
+    {PWM_2, PWMOUT_ON_APB1},
+#endif
+#if defined(TIM3_BASE)
+    {PWM_3, PWMOUT_ON_APB1},
+#endif
+#if defined(TIM14_BASE)
+    {PWM_14, PWMOUT_ON_APB1},
+#endif
+#if defined(TIM1_BASE)
+    {PWM_1, PWMOUT_ON_APB1},
+#endif
+#if defined(TIM15_BASE)
+    {PWM_15, PWMOUT_ON_APB1},
+#endif
+#if defined(TIM16_BASE)
+    {PWM_16, PWMOUT_ON_APB1},
+#endif
+#if defined(TIM17_BASE)
+    {PWM_17, PWMOUT_ON_APB1},
+#endif
+    {(PWMName) 0, PWMOUT_UNKNOWN}
+};
+
+#endif // DEVICE_PWMOUT
+
+#endif