added CC2541 8051 example

cc25xx-8051-example/ti/BLE-CC254x/Components/hal/target/CC2540USB/hal_crc.c

@@ -0,0 +1,116 @@
+/**************************************************************************************************
+  Filename:       _hal_crc.c
+  Revised:        $Date: 2012-12-04 18:36:53 -0800 (Tue, 04 Dec 2012) $
+  Revision:       $Revision: 32433 $
+
+  Description: This file defines the interface to the H/W CRC driver by LFSR.
+
+
+  Copyright 2012 Texas Instruments Incorporated. All rights reserved.
+
+  IMPORTANT: Your use of this Software is limited to those specific rights
+  granted under the terms of a software license agreement between the user
+  who downloaded the software, his/her employer (which must be your employer)
+  and Texas Instruments Incorporated (the "License").  You may not use this
+  Software unless you agree to abide by the terms of the License. The License
+  limits your use, and you acknowledge, that the Software may not be modified,
+  copied or distributed unless embedded on a Texas Instruments microcontroller
+  or used solely and exclusively in conjunction with a Texas Instruments radio
+  frequency transceiver, which is integrated into your product.  Other than for
+  the foregoing purpose, you may not use, reproduce, copy, prepare derivative
+  works of, modify, distribute, perform, display or sell this Software and/or
+  its documentation for any purpose.
+
+  YOU FURTHER ACKNOWLEDGE AND AGREE THAT THE SOFTWARE AND DOCUMENTATION ARE
+  PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED,
+  INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY, TITLE,
+  NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL
+  TEXAS INSTRUMENTS OR ITS LICENSORS BE LIABLE OR OBLIGATED UNDER CONTRACT,
+  NEGLIGENCE, STRICT LIABILITY, CONTRIBUTION, BREACH OF WARRANTY, OR OTHER
+  LEGAL EQUITABLE THEORY ANY DIRECT OR INDIRECT DAMAGES OR EXPENSES
+  INCLUDING BUT NOT LIMITED TO ANY INCIDENTAL, SPECIAL, INDIRECT, PUNITIVE
+  OR CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA, COST OF PROCUREMENT
+  OF SUBSTITUTE GOODS, TECHNOLOGY, SERVICES, OR ANY CLAIMS BY THIRD PARTIES
+  (INCLUDING BUT NOT LIMITED TO ANY DEFENSE THEREOF), OR OTHER SIMILAR COSTS.
+
+  Should you have any questions regarding your right to use this Software,
+  contact Texas Instruments Incorporated at www.TI.com.
+**************************************************************************************************/
+
+/* ------------------------------------------------------------------------------------------------
+ *                                          Includes
+ * ------------------------------------------------------------------------------------------------
+ */
+
+#include "hal_board.h"
+#include "hal_crc.h"
+#include "hal_types.h"
+
+/**************************************************************************************************
+ * @fn          HalCRCCalc
+ *
+ * @brief       Calculate the H/W CRC result.
+ *
+ * input parameters
+ *
+ * None.
+ *
+ * output parameters
+ *
+ * None.
+ *
+ * @return      The H/W CRC result.
+ */
+uint16 HalCRCCalc(void)
+{
+  uint16 crc = RNDH;
+  crc = (crc << 8) | RNDL;
+
+  return crc;
+}
+
+/**************************************************************************************************
+ * @fn          HalCRCExec
+ *
+ * @brief       Execute the H/W CRC calculation on the input byte.
+ *
+ * input parameters
+ *
+ * @param       ch - The byte on which to execute the H/W CRC calculation.
+ *
+ * output parameters
+ *
+ * None.
+ *
+ * @return      None.
+ */
+void HalCRCExec(uint8 ch)
+{
+  RNDH = ch;
+}
+
+/**************************************************************************************************
+ * @fn          HalCRCInit
+ *
+ * @brief       Initialize the H/W for a new CRC calculation.
+ *
+ * input parameters
+ *
+ * @param       seed - The CRC seed.
+ *
+ * output parameters
+ *
+ * None.
+ *
+ * @return      None.
+ */
+void HalCRCInit(uint16 seed)
+{
+  ADCCON1 &= 0xF3;  // CRC configuration of LRSR.
+
+  RNDL = HI_UINT16(seed);
+  RNDL = LO_UINT16(seed);
+}
+
+/**************************************************************************************************
+*/