From 8a96a62c42708d5da7ce90e455531ec16986ee93 Mon Sep 17 00:00:00 2001
From: Hauke Petersen <hauke.petersen@fu-berlin.de>
Date: Wed, 9 Dec 2015 15:05:02 +0100
Subject: [PATCH] cpu/stm32f4discovery: fixed freq return in pwm_init

---
 cpu/stm32f4/periph/pwm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cpu/stm32f4/periph/pwm.c b/cpu/stm32f4/periph/pwm.c
index eaf5e76b35..f317efb929 100644
--- a/cpu/stm32f4/periph/pwm.c
+++ b/cpu/stm32f4/periph/pwm.c
@@ -120,6 +120,8 @@ int pwm_init(pwm_t dev, pwm_mode_t mode, unsigned int frequency, unsigned int re
     }
     tim->PSC = (pwm_clk / (resolution * frequency)) - 1;
     tim->ARR = resolution - 1;
+    /* calculate the actual PWM frequency */
+    frequency = (pwm_clk / (resolution * (tim->PSC + 1)));
 
     /* set PWM mode */
     switch (mode) {