1 files changed, 159 insertions, 0 deletions
diff --git a/os/hal/ports/NRF5/LLD/RNGv1/hal_rng_lld.h b/os/hal/ports/NRF5/LLD/RNGv1/hal_rng_lld.h
new file mode 100644
index 0000000..a74f6ef
--- /dev/null
+++ b/os/hal/ports/NRF5/LLD/RNGv1/hal_rng_lld.h
@@ -0,0 +1,159 @@
+/*
+    RNG for ChibiOS - Copyright (C) 2016 Stephane D'Alu
+
+    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    RNGv1/hal_rng_lld.h
+ * @brief   NRF5 RNG subsystem low level driver header.
+ *
+ * @addtogroup RNG
+ * @{
+ */
+
+#ifndef HAL_RNG_LLD_H
+#define HAL_RNG_LLD_H
+
+#if (HAL_USE_RNG == TRUE) || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants.                                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver pre-compile time settings.                                         */
+/*===========================================================================*/
+
+/**
+ * @name    Configuration options
+ * @{
+ */
+/**
+ * @brief   RNGD1 driver enable switch.
+ * @details If set to @p TRUE the support for RNGD1 is included.
+ * @note    The default is @p FALSE.
+ */
+#if !defined(NRF5_RNG_USE_RNG0) || defined(__DOXYGEN__)
+#define NRF5_RNG_USE_RNG0                  FALSE
+#endif
+
+/**
+ * @brief   RNG interrupt priority level setting for RNG0.
+ */
+#if !defined(NRF5_RNG_RNG0_IRQ_PRIORITY) || defined(__DOXYGEN__)
+#define NRF5_RNG_RNG0_IRQ_PRIORITY         3
+#endif
+
+
+/*===========================================================================*/
+/* Derived constants and error checks.                                       */
+/*===========================================================================*/
+
+#if NRF5_RNG_USE_RNG0 == FALSE
+#error "Requesting RNG driver, but no RNG peripheric attached"
+#endif
+
+#if NRF5_RNG_USE_RNG0 &&					\
+    !OSAL_IRQ_IS_VALID_PRIORITY(NRF5_RNG_RNG0_IRQ_PRIORITY)
+#error "Invalid IRQ priority assigned to RNG0"
+#endif
+
+/*===========================================================================*/
+/* Driver data structures and types.                                         */
+/*===========================================================================*/
+
+/**
+ * @brief   Type of a structure representing an RNG driver.
+ */
+typedef struct RNGDriver RNGDriver;
+
+/**
+ * @brief   Driver configuration structure.
+ */
+typedef struct {
+  /* End of the mandatory fields.*/
+  /**
+   * @brief   Activate the digital error correction
+   *
+   * @details A digital corrector algorithm is employed to remove any
+   *          bias toward '1' or '0'. Disabling it offers a substantial
+   *          speed advantage, but may result in a statistical distribution
+   *          that is not perfectly uniform.
+   *
+   * @note    For nRF51, on average, it take 167µs to get a byte without
+   *          digitial error correction and 677µs with, but no garantee 
+   *          is made on the necessary time to generate one byte.
+   */
+  uint8_t digital_error_correction:1;
+} RNGConfig;
+
+
+/**
+ * @brief   Structure representing an RNG driver.
+ */
+struct RNGDriver {
+  /**
+   * @brief Driver state.
+   */
+  rngstate_t                state;
+  /**
+   * @brief Current configuration data.
+   */
+  const RNGConfig           *config;
+#if RNG_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
+  /**
+   * @brief   Mutex protecting the peripheral.
+   */
+  mutex_t                   mutex;
+#endif /* RNG_USE_MUTUAL_EXCLUSION */
+  /* End of the mandatory fields.*/
+  /**
+   * @brief Pointer to the RNGx registers block.
+   */
+  NRF_RNG_Type             *rng;
+  /**
+   * @brief IRQ number
+   */
+  uint32_t                  irq;
+};
+
+/*===========================================================================*/
+/* Driver macros.                                                            */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* External declarations.                                                    */
+/*===========================================================================*/
+
+#if NRF5_RNG_USE_RNG0 && !defined(__DOXYGEN__)
+extern RNGDriver RNGD1;
+#endif /* NRF5_RNG_USE_RNG0 */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  void rng_lld_init(void);
+  void rng_lld_start(RNGDriver *rngp);
+  void rng_lld_stop(RNGDriver *rngp);
+  msg_t rng_lld_write(RNGDriver *rngp, uint8_t *buf, size_t n,
+                      systime_t timeout);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_RNG */
+
+#endif /* HAL_RNG_LLD_H */
+
+/** @} */