From cee859c9aeda07b2083760ce08afb1c7187f4037 Mon Sep 17 00:00:00 2001
From: Balazs Eszes <c4deszes@gmail.com>
Date: Sun, 9 Mar 2025 10:43:41 +0100
Subject: [PATCH] Evsys fix channel offset (0 meaning disconnected) Adds
 function to disconnect event generator

---
 include/hal/evsys.h | 11 +++++++++++
 src/hal/evsys.c     |  6 +++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/include/hal/evsys.h b/include/hal/evsys.h
index 7d48f0c..6392a22 100644
--- a/include/hal/evsys.h
+++ b/include/hal/evsys.h
@@ -42,6 +42,17 @@ void EVSYS_ConfigureGenerator(uint8_t channel, evsys_gen_edgesel edgsel, evsys_g
  */
 void EVSYS_ConfigureUser(uint8_t user_channel, uint8_t event_generator);
 
+/**
+ * @brief Disconnects the event user from the event generator
+ * 
+ * @code
+ * EVSYS_DisconnectUser(EVENT_ID_USER_TC4_EVU);
+ * @endcode
+ * 
+ * @param user_channel Event's consumer
+ */
+void EVSYS_DisconnectUser(uint8_t user_channel);
+
 /**
  * @brief Acquires a free generator channel
  * 
diff --git a/src/hal/evsys.c b/src/hal/evsys.c
index e9fc7c5..ee71413 100644
--- a/src/hal/evsys.c
+++ b/src/hal/evsys.c
@@ -11,7 +11,11 @@ void EVSYS_ConfigureGenerator(uint8_t channel, evsys_gen_edgesel edgsel, evsys_g
 }
 
 void EVSYS_ConfigureUser(uint8_t user_channel, uint8_t event_generator) {
-    EVSYS_REGS->EVSYS_USER = (event_generator << EVSYS_USER_CHANNEL_Pos) | user_channel;
+    EVSYS_REGS->EVSYS_USER = ((event_generator + 1) << EVSYS_USER_CHANNEL_Pos) | (user_channel);
+}
+
+void EVSYS_DisconnectUser(uint8_t user_channel) {
+    EVSYS_REGS->EVSYS_USER = (0 << EVSYS_USER_CHANNEL_Pos) | (user_channel);
 }
 
 uint8_t EVSYS_AcquireGeneratorChannel(void) {