From 0e274fc31006bbc1f381abe3d240cca8c47676a4 Mon Sep 17 00:00:00 2001
From: Giovanni Di Sirio <gdisirio@gmail.com>
Date: Sun, 25 Apr 2021 07:55:43 +0000
Subject: [PATCH] Single APB variant.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@14316 27425a3e-05d8-49a3-a47f-9c15f0e5edd8
---
 os/hal/ports/STM32/LLD/RCCv1/stm32_apb.inc | 111 +++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 os/hal/ports/STM32/LLD/RCCv1/stm32_apb.inc

diff --git a/os/hal/ports/STM32/LLD/RCCv1/stm32_apb.inc b/os/hal/ports/STM32/LLD/RCCv1/stm32_apb.inc
new file mode 100644
index 000000000..79e885fb1
--- /dev/null
+++ b/os/hal/ports/STM32/LLD/RCCv1/stm32_apb.inc
@@ -0,0 +1,111 @@
+/*
+    ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @file    RCCv1/stm32_apb.inc
+ * @brief   Shared APB clock handler.
+ *
+ * @addtogroup STM32_APB_HANDLER
+ * @{
+ */
+
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+/**
+ * @name    PPRE field bits definitions
+ * @{
+ */
+#define STM32_PPRE_MASK         (7U << RCC_CFGR_PPRE_Pos)
+#define STM32_PPRE_FIELD(n)     ((n) << RCC_CFGR_PPRE_Pos)
+#define STM32_PPRE_DIV1         STM32_PPRE_FIELD(0U)
+#define STM32_PPRE_DIV2         STM32_PPRE_FIELD(4U)
+#define STM32_PPRE_DIV4         STM32_PPRE_FIELD(5U)
+#define STM32_PPRE_DIV8         STM32_PPRE_FIELD(6U)
+#define STM32_PPRE_DIV16        STM32_PPRE_FIELD(7U)
+/** @} */
+
+/*===========================================================================*/
+/* Derived constants and error checks.                                       */
+/*===========================================================================*/
+
+/* Registry checks for robustness.*/
+
+/* Checks on configurations.*/
+#if !defined(STM32_PPRE)
+#error "STM32_PPRE not defined in mcuconf.h"
+#endif
+
+/* Input checks.*/
+#if !defined(STM32_PCLK_MAX)
+#error "STM32_PCLK_MAX not defined in hal_lld.h"
+#endif
+
+#if !defined(STM32_HCLK)
+#error "STM32_HCLK not defined in hal_lld.h"
+#endif
+
+/**
+ * @brief   APB frequency.
+ */
+#if (STM32_PPRE == STM32_PPRE_DIV1) || defined(__DOXYGEN__)
+#define STM32_PCLK                  (STM32_HCLK / 1U)
+
+#elif STM32_PPRE == STM32_PPRE_DIV2
+#define STM32_PCLK                  (STM32_HCLK / 2U)
+
+#elif STM32_PPRE == STM32_PPRE_DIV4
+#define STM32_PCLK                  (STM32_HCLK / 4U)
+
+#elif STM32_PPRE == STM32_PPRE_DIV8
+#define STM32_PCLK                  (STM32_HCLK / 8U)
+
+#elif STM32_PPRE == STM32_PPRE_DIV16
+#define STM32_PCLK                  (STM32_HCLK / 16U)
+
+#else
+#error "invalid STM32_PPRE value specified"
+#endif
+
+/*
+ * APB1 frequency check.
+ */
+#if STM32_PCLK > STM32_PCLK_MAX
+#error "STM32_PCLK exceeding maximum frequency (STM32_PCLK_MAX)"
+#endif
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver interrupt handlers.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/** @} */