diff options
Diffstat (limited to 'os/hal/platforms/STM8L/hal_lld.c')
| -rw-r--r-- | os/hal/platforms/STM8L/hal_lld.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/os/hal/platforms/STM8L/hal_lld.c b/os/hal/platforms/STM8L/hal_lld.c new file mode 100644 index 000000000..06e6ad981 --- /dev/null +++ b/os/hal/platforms/STM8L/hal_lld.c @@ -0,0 +1,123 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006-2013 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 STM8L/hal_lld.c
+ * @brief STM8L HAL subsystem low level driver source.
+ *
+ * @addtogroup HAL
+ * @{
+ */
+
+#include "ch.h"
+#include "hal.h"
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables and types. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Low level HAL driver initialization.
+ * @details Clock sources initialization, HSI is assumed to be already
+ * started after reset.
+ * @note If the @p STM8L_CLOCK_INIT option is set to @p FALSE then the
+ * initialization is not performed and is left to the application.
+ *
+ * @notapi
+ */
+void hal_lld_init(void) {
+
+#if !STM8L_NO_CLOCK_INIT
+ /* Makes sure that HSI is stable before proceeding.*/
+ CLK->ICKCR |= CLK_ICKCR_HSION;
+ while ((CLK->ICKCR & CLK_ICKCR_HSIRDY) == 0)
+ ;
+
+ /* LSI startup and stabilization if required.*/
+#if STM8L_LSI_ENABLED
+ CLK->ICKCR |= CLK_ICKCR_LSION;
+ while ((CLK->ICKCR & CLK_ICKCR_LSIRDY) == 0)
+ ;
+#endif
+
+ /* HSE startup and stabilization if required.*/
+#if STM8L_HSE_ENABLED
+#if HSEBYPASS
+ CLK->ECKCR |= CLK_ECKCR_HSEON | CLK_ECKCR_HSEBYP;
+#else
+ CLK->ECKCR |= CLK_ECKCR_HSEON;
+#endif
+ while ((CLK->ECKCR & CLK_ECKCR_HSERDY) == 0)
+ ;
+#endif
+
+ /* LSE startup and stabilization if required.*/
+#if STM8L_LSE_ENABLED
+#if LSEBYPASS
+ CLK->ECKCR |= CLK_ECKCR_LSEON | CLK_ECKCR_LSEBYP;
+#else
+ CLK->ECKCR |= CLK_ECKCR_LSEON;
+#endif
+ while ((CLK->ECKCR & CLK_ECKCR_LSERDY) == 0)
+ ;
+#endif
+
+ /* Setting up clock dividers.*/
+ CLK->CKDIVR = STM8L_SYSCLK_DIVIDER << 0;
+
+ /* SYSCLK switch to the selected source, not necessary if it is HSI.*/
+#if STM8L_SYSCLK_SOURCE != CLK_SYSSEL_HSI
+ /* Switching clock (manual switch mode).*/
+ CLK->SWR = STM8L_SYSCLK_SOURCE;
+ while ((CLK->SWCR & CLK_SWCR_SWIF) == 0)
+ ;
+ CLK->SWCR = CLK_SWCR_SWEN;
+#endif
+
+ /* Clocks initially all disabled, note the boot ROM clock is disabled
+ because the boot loader is no more required and it draws precious uAs.*/
+ CLK->PCKENR1 = 0;
+ CLK->PCKENR2 = 0;
+ CLK->PCKENR3 = 0;
+
+ /* Other clock related initializations.*/
+ CLK->CSSR = 0;
+ CLK->CCOR = 0;
+
+ /* HSI disabled if it is no more required.*/
+#if !STM8L_HSI_ENABLED
+ CLK->ICKCR &= ~CLK_ICKCR_HSION;
+#endif
+#endif /* !STM8L_NO_CLOCK_INIT */
+}
+
+/** @} */
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