From 0da692511988cb35e22a27f34e40d49cc7d5142f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mario=20H=C3=BCttel?= <mario.huettel@gmx.net>
Date: Sun, 30 Aug 2020 18:25:10 +0200
Subject: [PATCH] Issue #17: Add override function for deltas of rotary encoder

---
 .../include/reflow-controller/rotary-encoder.h       |  2 ++
 stm-firmware/rotary-encoder.c                        | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/stm-firmware/include/reflow-controller/rotary-encoder.h b/stm-firmware/include/reflow-controller/rotary-encoder.h
index 706cb32..3b5721b 100644
--- a/stm-firmware/include/reflow-controller/rotary-encoder.h
+++ b/stm-firmware/include/reflow-controller/rotary-encoder.h
@@ -41,4 +41,6 @@ void rotary_encoder_stop(void);
 
 void rotary_encoder_zero(void);
 
+void rotary_encoder_override_delta(int16_t delta);
+
 #endif /* __ROTARY_ENCODER_H__ */
diff --git a/stm-firmware/rotary-encoder.c b/stm-firmware/rotary-encoder.c
index d079b50..d4dc2b5 100644
--- a/stm-firmware/rotary-encoder.c
+++ b/stm-firmware/rotary-encoder.c
@@ -23,6 +23,8 @@
 #include <stm-periph/stm32-gpio-macros.h>
 #include <helper-macros/helper-macros.h>
 
+static int16_t IN_SECTION(.ccm.bss) override_delta;
+
 static inline void rotary_encoder_setup_pins(void)
 {
 	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(ROTARY_ENCODER_RCC_MASK));
@@ -45,6 +47,8 @@ void rotary_encoder_setup(void)
 	ROTARY_ENCODER_TIMER->CCER = TIM_CCER_CC1P | TIM_CCER_CC2P;
 	ROTARY_ENCODER_TIMER->PSC = 0;
 	ROTARY_ENCODER_TIMER->CR1 = TIM_CR1_CEN;
+
+	override_delta = 0;
 }
 
 uint32_t rotary_encoder_get_abs_val(void)
@@ -72,6 +76,9 @@ int32_t rotary_encoder_get_change_val(void)
 
 	last_val = val;
 
+	diff += override_delta;
+	override_delta = 0;
+
 	return diff;
 }
 
@@ -88,3 +95,8 @@ void rotary_encoder_zero(void)
 {
 	ROTARY_ENCODER_TIMER->CNT = 0UL;
 }
+
+void rotary_encoder_override_delta(int16_t delta)
+{
+	override_delta = delta;
+}