Import Mbed OS hard-float snapshot

targets/TARGET_NUVOTON/TARGET_NANO100/device/StdDriver/nano100_crc.c

@@ -0,0 +1,100 @@
+/**************************************************************************//**
+ * @file     crc.c
+ * @version  V1.00
+ * $Revision: 3 $
+ * $Date: 14/09/29 3:50p $
+ * @brief    Nano100 series CRC driver source file
+ *
+ * @note
+ * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
+*****************************************************************************/
+#include "Nano100Series.h"
+
+
+
+/** @addtogroup NANO100_Device_Driver NANO100 Device Driver
+  @{
+*/
+
+/** @addtogroup NANO100_CRC_Driver CRC Driver
+  @{
+*/
+
+
+/** @addtogroup NANO100_CRC_EXPORTED_FUNCTIONS CRC Exported Functions
+  @{
+*/
+
+/**
+ * @brief       CRC Open
+ *
+ * @param[in]   u32Mode      CRC Polynomial Mode \ref CRC_CCITT, \ref CRC_8, \ref CRC_16, \ref CRC_32
+ * @param[in]   u32Attribute Parameter attribute \ref CRC_CHECKSUM_COM, \ref CRC_CHECKSUM_RVS, \ref CRC_WDATA_COM, \ref CRC_WDATA_RVS
+ * @param[in]   u32Seed      Seed value
+ * @param[in]   u32DataLen   CPU Write Data Length \ref CRC_CPU_WDATA_8, \ref CRC_CPU_WDATA_16, \ref CRC_CPU_WDATA_32
+ *
+ * @return      None
+ *
+ * @details     This function enable the CRC channel.
+ */
+void CRC_Open(uint32_t u32Mode, uint32_t u32Attribute, uint32_t u32Seed, uint32_t u32DataLen)
+{
+    PDMAGCR->GCRCSR |= DMA_GCR_GCRCSR_CRC_CLK_EN_Msk;
+    PDMACRC->SEED = u32Seed;
+    PDMACRC->CTL = u32Mode | u32Attribute | u32DataLen | DMA_CRC_CTL_CRCCEN_Msk;
+    /* When operated in CPU PIO mode, setting RST bit will reload the initial seed value (CRC_SEED register) */
+    PDMACRC->CTL |= DMA_CRC_CTL_CRC_RST_Msk;
+}
+
+/**
+ * @brief       CRC Start DMA transfer
+ *
+ * @param[in]   u32SrcAddr      Source address
+ * @param[in]   u32ByteCount    Calculate byte count
+ *
+ * @return      None
+ *
+ * @details     This function start DMA transfer.
+ */
+void CRC_StartDMATransfer(uint32_t u32SrcAddr, uint32_t u32ByteCount)
+{
+    PDMACRC->DMASAR = u32SrcAddr;
+    PDMACRC->DMABCR = u32ByteCount;
+    PDMACRC->CTL |= DMA_CRC_CTL_TRIG_EN_Msk;
+}
+
+/**
+ * @brief       Get CRC Checksum
+ *
+ * @param[in]   None
+ *
+ * @return      Checksum
+ *
+ * @details     This macro get the CRC checksum
+ */
+uint32_t CRC_GetChecksum(void)
+{
+    switch (PDMACRC->CTL & DMA_CRC_CTL_CRC_MODE_Msk) {
+    case CRC_CCITT:
+    case CRC_16:
+        return (PDMACRC->CHECKSUM & 0xffff);
+
+    case CRC_32:
+        return (PDMACRC->CHECKSUM);
+
+    case CRC_8:
+        return (PDMACRC->CHECKSUM & 0xff);
+
+    default:
+        return 0;
+    }
+}
+
+
+/*@}*/ /* end of group NANO100_CRC_EXPORTED_FUNCTIONS */
+
+/*@}*/ /* end of group NANO100_CRC_Driver */
+
+/*@}*/ /* end of group NANO100_Device_Driver */
+
+/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/