From 5938ffc0d5ee525a5d39249f3da29ac6c065aed0 Mon Sep 17 00:00:00 2001
From: Lisin Dmitriy <d.lisin@thirdpin.ru>
Date: Wed, 18 Sep 2019 17:54:10 +0300
Subject: IMPR: [tim] Add some ETR config methods

---
 cm3cpp/timer.cpp | 25 +++++++++++++++++++++++++
 cm3cpp/timer.hpp | 11 +++++++++++
 2 files changed, 36 insertions(+)

diff --git a/cm3cpp/timer.cpp b/cm3cpp/timer.cpp
index e02b54b..49768ec 100644
--- a/cm3cpp/timer.cpp
+++ b/cm3cpp/timer.cpp
@@ -1698,6 +1698,31 @@ void Timer::set_capture_compare_4_value(uint32_t value)
     TIM_CCR4(_timer) = value;
 }
 
+void Timer::enable_etr_clock()
+{
+    TIM_SMCR(_timer) |= TIM_SMCR_ECE;  // set enable bit
+}
+
+void Timer::disable_etr_clock()
+{
+    TIM_SMCR(_timer) &= ~TIM_SMCR_ECE;  // reset enable bit
+}
+
+void Timer::set_etr_filter(ExtTriggerFilter filter)
+{
+    timer_slave_set_filter(_timer, filter);
+}
+
+void Timer::set_etr_prescaler(ExtTriggerPrescaler prescaler)
+{
+    timer_slave_set_prescaler(_timer, prescaler);
+}
+
+void Timer::set_etr_polarity(ExtTriggerPolarity polarity)
+{
+    timer_slave_set_polarity(_timer, polarity);
+}
+
 }  // namespace tim
 
 }  // namespace cm3cpp
diff --git a/cm3cpp/timer.hpp b/cm3cpp/timer.hpp
index 31b78a9..b3fc2de 100644
--- a/cm3cpp/timer.hpp
+++ b/cm3cpp/timer.hpp
@@ -179,6 +179,9 @@ class Timer
     };
 
     Timer(uint8_t timer_num)
+    using ExtTriggerFilter = tim_ic_filter;
+    using ExtTriggerPrescaler = tim_ic_psc;
+    using ExtTriggerPolarity = tim_et_pol;
     {
 #if defined(STM32F2) || defined(STM32F4)
         switch (timer_num) {
@@ -260,6 +263,14 @@ class Timer
     Result set_trigger(Trigger trigger);
     Result enable_master_slave_mode();
     Result disable_master_slave_mode();
+
+    // ETR config (external trigger), TIM 1-8 (F4, F2)
+    void enable_etr_clock();  //!< Enable CNT after ETR clock enabling
+    void disable_etr_clock();
+    void set_etr_filter(ExtTriggerFilter);
+    void set_etr_prescaler(ExtTriggerPrescaler);
+    void set_etr_polarity(ExtTriggerPolarity);
+
     // DIER/////////////////////////////////////////////////////
     Result enable_update_interrupt();
     Result disable_update_interrupt();
-- 
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