From 9ad1c43e87dea94438382486e1c6fd8285e12148 Mon Sep 17 00:00:00 2001
From: Giovanni Di Sirio <gdisirio@gmail.com>
Date: Sun, 30 Jun 2019 07:38:10 +0000
Subject: Fixed bug #1036.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/stable_19.1.x@12856 27425a3e-05d8-49a3-a47f-9c15f0e5edd8
---
 os/hal/ports/STM32/STM32L4xx+/stm32_rcc.h | 23 +++++++++++++++++++++++
 os/hal/ports/STM32/STM32L4xx/stm32_rcc.h  | 23 +++++++++++++++++++++++
 readme.txt                                |  1 +
 3 files changed, 47 insertions(+)

diff --git a/os/hal/ports/STM32/STM32L4xx+/stm32_rcc.h b/os/hal/ports/STM32/STM32L4xx+/stm32_rcc.h
index d88c378f4..cc86599c1 100644
--- a/os/hal/ports/STM32/STM32L4xx+/stm32_rcc.h
+++ b/os/hal/ports/STM32/STM32L4xx+/stm32_rcc.h
@@ -595,6 +595,29 @@
  * @api
  */
 #define rccResetI2C3() rccResetAPB1R1(RCC_APB1RSTR1_I2C3RST)
+
+/**
+ * @brief Enables the I2C4 peripheral clock.
+ *
+ * @param[in] lp low power enable flag
+ *
+ * @api
+ */
+#define rccEnableI2C4(lp) rccEnableAPB1R2(RCC_APB1ENR2_I2C4EN, lp)
+
+/**
+ * @brief Disables the I2C4 peripheral clock.
+ *
+ * @api
+ */
+#define rccDisableI2C4() rccDisableAPB1R1(RCC_APB1ENR2_I2C4EN)
+
+/**
+ * @brief Resets the I2C4 peripheral.
+ *
+ * @api
+ */
+#define rccResetI2C4() rccResetAPB1R1(RCC_APB1RSTR2_I2C4RST)
 /** @} */
 
 /**
diff --git a/os/hal/ports/STM32/STM32L4xx/stm32_rcc.h b/os/hal/ports/STM32/STM32L4xx/stm32_rcc.h
index a48e305f8..48ad74050 100644
--- a/os/hal/ports/STM32/STM32L4xx/stm32_rcc.h
+++ b/os/hal/ports/STM32/STM32L4xx/stm32_rcc.h
@@ -567,6 +567,29 @@
  * @api
  */
 #define rccResetI2C3() rccResetAPB1R1(RCC_APB1RSTR1_I2C3RST)
+
+/**
+ * @brief Enables the I2C4 peripheral clock.
+ *
+ * @param[in] lp low power enable flag
+ *
+ * @api
+ */
+#define rccEnableI2C4(lp) rccEnableAPB1R2(RCC_APB1ENR2_I2C4EN, lp)
+
+/**
+ * @brief Disables the I2C4 peripheral clock.
+ *
+ * @api
+ */
+#define rccDisableI2C4() rccDisableAPB1R1(RCC_APB1ENR2_I2C4EN)
+
+/**
+ * @brief Resets the I2C4 peripheral.
+ *
+ * @api
+ */
+#define rccResetI2C4() rccResetAPB1R1(RCC_APB1RSTR2_I2C4RST)
 /** @} */
 
 /**
diff --git a/readme.txt b/readme.txt
index 0067ea02c..4fa618da8 100644
--- a/readme.txt
+++ b/readme.txt
@@ -78,6 +78,7 @@
        generate a library with a pre-configured RT. It also includes
        an "header generator" able to generate an unified "ch.h" with
        all options resolved.
+- FIX: Fixed missing I2C4 RCC definitions for L4/L4+ (bug #1036).
 - FIX: Fixed missing delay after STM32 wait states setup (bug #1035).
 - FIX: Fixed reduced time slices in RT (bug #1034).
 - FIX: Fixed long intervals fail when interval type is larger than time type
-- 
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