1 files changed, 157 insertions, 0 deletions
diff --git a/os/hal/ports/STM32/LLD/RNGv1/hal_trng_lld.h b/os/hal/ports/STM32/LLD/RNGv1/hal_trng_lld.h
new file mode 100644
index 000000000..3f04adcde
--- /dev/null
+++ b/os/hal/ports/STM32/LLD/RNGv1/hal_trng_lld.h
@@ -0,0 +1,157 @@
+/*
+    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    hal_trng_lld.h
+ * @brief   STM32 TRNG subsystem low level driver header.
+ *
+ * @addtogroup TRNG
+ * @{
+ */
+
+#ifndef HAL_TRNG_LLD_H
+#define HAL_TRNG_LLD_H
+
+#if (HAL_USE_TRNG == TRUE) || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants.                                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver pre-compile time settings.                                         */
+/*===========================================================================*/
+
+/**
+ * @name    STM32 configuration options
+ * @{
+ */
+/**
+ * @brief   TRNGD1 driver enable switch.
+ * @details If set to @p TRUE the support for TRNGD1 is included.
+ * @note    The default is @p FALSE.
+ */
+#if !defined(STM32_TRNG_USE_RNG1) || defined(__DOXYGEN__)
+#define STM32_TRNG_USE_RNG1                 FALSE
+#endif
+
+/**
+ * @brief   TRNGD1 error clear timeout counter.
+ * @details Number of status register fetches before failing.
+ */
+#if !defined(STM32_TRNG_ERROR_CLEAR_ATTEMPTS) || defined(__DOXYGEN__)
+#define STM32_TRNG_ERROR_CLEAR_ATTEMPTS     1000
+#endif
+
+/**
+ * @brief   TRNGD1 data available timeout counter.
+ * @details Number of status register fetches before failing.
+ */
+#if !defined(STM32_DATA_FETCH_ATTEMPTS) || defined(__DOXYGEN__)
+#define STM32_DATA_FETCH_ATTEMPTS           1000
+#endif
+/** @} */
+
+/*===========================================================================*/
+/* Derived constants and error checks.                                       */
+/*===========================================================================*/
+
+#if !defined(STM32_HAS_RNG1)
+#define STM32_HAS_RNG1                      FALSE
+#endif
+
+#if STM32_TRNG_USE_RNG1 && !STM32_HAS_RNG1
+#error "RNG1 not present in the selected device"
+#endif
+
+#if !STM32_TRNG_USE_RNG1
+#error "TRNG driver activated but no RNG peripheral assigned"
+#endif
+
+#if !defined(STM32_RNGCLK)
+#error "STM32_RNGCLK not defined in this HAL"
+#endif
+
+#if STM32_RNGCLK != 48000000
+#error "STM32_RNGCLK is not exactly 48000000"
+#endif
+
+/*===========================================================================*/
+/* Driver data structures and types.                                         */
+/*===========================================================================*/
+
+/**
+ * @brief   Driver configuration structure.
+ * @note    It could be empty on some architectures.
+ */
+typedef struct {
+  /* End of the mandatory fields.*/
+  /**
+   * @brief   Dummy configuration, it is not needed.
+   */
+  uint32_t                   dummy;
+} TRNGConfig;
+
+/**
+ * @brief   Structure representing a TRNG driver.
+ */
+struct TRNGDriver {
+  /**
+   * @brief Driver state.
+   */
+  trngstate_t                state;
+  /**
+   * @brief Current configuration data.
+   */
+  const TRNGConfig           *config;
+#if defined(TRNG_DRIVER_EXT_FIELDS)
+  TRNG_DRIVER_EXT_FIELDS
+#endif
+  /* End of the mandatory fields.*/
+  /**
+    * @brief Pointer to the RNG registers block.
+    */
+  RNG_TypeDef                *rng;
+};
+
+/*===========================================================================*/
+/* Driver macros.                                                            */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* External declarations.                                                    */
+/*===========================================================================*/
+
+#if (STM32_TRNG_USE_RNG1 == TRUE) && !defined(__DOXYGEN__)
+extern TRNGDriver TRNGD1;
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  void trng_lld_init(void);
+  void trng_lld_start(TRNGDriver *trngp);
+  void trng_lld_stop(TRNGDriver *trngp);
+  bool trng_lld_generate(TRNGDriver *trngp, size_t size, uint8_t *out);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_TRNG == TRUE */
+
+#endif /* HAL_TRNG_LLD_H */
+
+/** @} */