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libraries/sdk/Peripheral/ch32v30x_rng.c

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+/********************************** (C) COPYRIGHT *******************************
+* File Name          : ch32v30x_rng.c
+* Author             : WCH
+* Version            : V1.0.0
+* Date               : 2021/06/06
+* Description        : This file provides all the RNG firmware functions.
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* SPDX-License-Identifier: Apache-2.0
+********************************************************************************/
+#include "ch32v30x_rng.h"
+#include "ch32v30x_rcc.h"
+
+/*********************************************************************
+ * @fn      RNG_Cmd
+ *
+ * @brief   Enables or disables the RNG peripheral.
+ *
+ * @param   NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void RNG_Cmd(FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        RNG->CR |= RNG_CR_RNGEN;
+    }
+    else
+    {
+        RNG->CR &= ~RNG_CR_RNGEN;
+    }
+}
+
+/*********************************************************************
+ * @fn      RNG_GetRandomNumber
+ *
+ * @brief   Returns a 32-bit random number.
+ *
+ * @return  32-bit random number.
+ */
+uint32_t RNG_GetRandomNumber(void)
+{
+    return RNG->DR;
+}
+
+/*********************************************************************
+ * @fn      RNG_ITConfig
+ *
+ * @brief   Enables or disables the RNG interrupt.
+ *
+ * @param   NewState - ENABLE or DISABLE.
+ *
+ * @return  32-bit random number.
+ */
+void RNG_ITConfig(FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        RNG->CR |= RNG_CR_IE;
+    }
+    else
+    {
+        RNG->CR &= ~RNG_CR_IE;
+    }
+}
+
+/*********************************************************************
+ * @fn      RNG_GetFlagStatus
+ *
+ * @brief   Checks whether the specified RNG flag is set or not.
+ *
+ * @param   RNG_FLAG - specifies the RNG flag to check.
+ *            RNG_FLAG_DRDY - Data Ready flag.
+ *            RNG_FLAG_CECS - Clock Error Current flag.
+ *            RNG_FLAG_SECS - Seed Error Current flag.
+ *
+ * @return  32-bit random number.
+ */
+FlagStatus RNG_GetFlagStatus(uint8_t RNG_FLAG)
+{
+    FlagStatus bitstatus = RESET;
+
+    if((RNG->SR & RNG_FLAG) != (uint8_t)RESET)
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      RNG_ClearFlag
+ *
+ * @brief   Clears the RNG flags.
+ *
+ * @param   RNG_FLAG - specifies the flag to clear.
+ *            RNG_FLAG_CECS - Clock Error Current flag.
+ *            RNG_FLAG_SECS - Seed Error Current flag.
+ *
+ * @return  32-bit random number.
+ */
+void RNG_ClearFlag(uint8_t RNG_FLAG)
+{
+    RNG->SR = ~(uint32_t)(((uint32_t)RNG_FLAG) << 4);
+}
+
+/*********************************************************************
+ * @fn      RNG_GetFlagStatus
+ *
+ * @brief   Checks whether the specified RNG interrupt has occurred or not.
+ *
+ * @param   RNG_IT - specifies the RNG interrupt source to check.
+ *            RNG_IT_CEI - Clock Error Interrupt.
+ *            RNG_IT_SEI - Seed Error Interrupt.
+ *
+ * @return  bitstatus<75><73>SET or RESET.
+ */
+ITStatus RNG_GetITStatus(uint8_t RNG_IT)
+{
+    ITStatus bitstatus = RESET;
+
+    if((RNG->SR & RNG_IT) != (uint8_t)RESET)
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      RNG_ClearITPendingBit
+ *
+ * @brief   Clears the RNG interrupt pending bit(s).
+ *
+ * @param   RNG_IT - specifies the RNG interrupt pending bit(s) to clear.
+ *            RNG_IT_CEI - Clock Error Interrupt.
+ *            RNG_IT_SEI - Seed Error Interrupt.
+ *
+ * @return  None
+ */
+void RNG_ClearITPendingBit(uint8_t RNG_IT)
+{
+    RNG->SR = (uint8_t)~RNG_IT;
+}