From 082d32226b582033daf565c9bddca3e600b31769 Mon Sep 17 00:00:00 2001
From: Pierre-noel Bouteville <pn_bouteville@yahoo.fr>
Date: Fri, 3 Jun 2016 08:45:22 -0600
Subject: [PATCH] STM32 Timer Driver: Change calculation of per-timer
 pre-scaler value

---
 arch/arm/src/stm32/stm32_tim.c | 94 ++++++++++++++++++++++++++++++----
 1 file changed, 84 insertions(+), 10 deletions(-)

diff --git a/arch/arm/src/stm32/stm32_tim.c b/arch/arm/src/stm32/stm32_tim.c
index 14359625f88..26749a05b0e 100644
--- a/arch/arm/src/stm32/stm32_tim.c
+++ b/arch/arm/src/stm32/stm32_tim.c
@@ -324,17 +324,91 @@ static int stm32_tim_setclock(FAR struct stm32_tim_dev_s *dev, uint32_t freq)
       return 0;
     }
 
-#if STM32_NATIM > 0
-  if (((struct stm32_tim_priv_s *)dev)->base == STM32_TIM1_BASE ||
-      ((struct stm32_tim_priv_s *)dev)->base == STM32_TIM8_BASE)
-    {
-      prescaler = STM32_TIM18_FREQUENCY / freq;
-    }
-  else
+  switch (((struct stm32_tim_priv_s *)dev)->base)
+  {
+#ifdef STM32_APB2_TIM1_CLKIN
+      case STM32_TIM1_BASE:
+          prescaler = STM32_APB2_TIM1_CLKIN / freq;
+          break;
 #endif
-    {
-      prescaler = STM32_TIM27_FREQUENCY / freq;
-    }
+#ifdef STM32_APB2_TIM2_CLKIN
+      case STM32_TIM2_BASE:
+          prescaler = STM32_APB2_TIM2_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM3_CLKIN
+      case STM32_TIM3_BASE:
+          prescaler = STM32_APB2_TIM3_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM4_CLKIN
+      case STM32_TIM4_BASE:
+          prescaler = STM32_APB2_TIM4_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM5_CLKIN
+      case STM32_TIM5_BASE:
+          prescaler = STM32_APB2_TIM5_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM6_CLKIN
+      case STM32_TIM6_BASE:
+          prescaler = STM32_APB2_TIM6_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM7_CLKIN
+      case STM32_TIM7_BASE:
+          prescaler = STM32_APB2_TIM7_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM8_CLKIN
+      case STM32_TIM8_BASE:
+          prescaler = STM32_APB2_TIM8_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM9_CLKIN
+      case STM32_TIM9_BASE:
+          prescaler = STM32_APB2_TIM9_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM10_CLKIN
+      case STM32_TIM10_BASE:
+          prescaler = STM32_APB2_TIM10_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM11_CLKIN
+      case STM32_TIM11_BASE:
+          prescaler = STM32_APB2_TIM11_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM12_CLKIN
+      case STM32_TIM12_BASE:
+          prescaler = STM32_APB2_TIM12_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM13_CLKIN
+      case STM32_TIM13_BASE:
+          prescaler = STM32_APB2_TIM13_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM14_CLKIN
+      case STM32_TIM14_BASE:
+          prescaler = STM32_APB2_TIM14_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM15_CLKIN
+      case STM32_TIM15_BASE:
+          prescaler = STM32_APB2_TIM15_CLKIN / freq;
+          break;
+#endif
+#ifdef STM32_APB2_TIM16_CLKIN
+      case STM32_TIM16_BASE:
+          prescaler = STM32_APB2_TIM16_CLKIN / freq;
+          break;
+#endif
+      default:
+          return ERROR;
+  }
 
   /* We need to decrement value for '1', but only, if we are allowed to
    * not to cause underflow. Check for overflow.