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DbgMCU.h

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00001 /**
00002  ******************************************************************************
00003  * @file    DbgMCU.h
00004  * @author  AST / EST
00005  * @version V0.0.1
00006  * @date    30-March-2015
00007  * @brief   Header file for enabling debugging in sleep modes for STM32 MCUs
00008  ******************************************************************************
00009  * @attention
00010  *
00011  * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
00012  *
00013  * Redistribution and use in source and binary forms, with or without modification,
00014  * are permitted provided that the following conditions are met:
00015  *   1. Redistributions of source code must retain the above copyright notice,
00016  *      this list of conditions and the following disclaimer.
00017  *   2. Redistributions in binary form must reproduce the above copyright notice,
00018  *      this list of conditions and the following disclaimer in the documentation
00019  *      and/or other materials provided with the distribution.
00020  *   3. Neither the name of STMicroelectronics nor the names of its contributors
00021  *      may be used to endorse or promote products derived from this software
00022  *      without specific prior written permission.
00023  *
00024  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00025  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00026  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00027  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
00028  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00029  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
00030  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
00031  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00032  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00033  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00034  *
00035  ******************************************************************************
00036  */
00037 
00038 /* Define to prevent from recursive inclusion --------------------------------*/
00039 #ifndef __DBG_MCU_H
00040 #define __DBG_MCU_H
00041 
00042 /* Includes ------------------------------------------------------------------*/
00043 
00044 /* Classes -------------------------------------------------------------------*/
00045 /** Helper class DbgMCU providing a default constructor which enables debugging
00046  *  on STM32 MCUs while using sleep modes.
00047  */
00048 class DbgMCU
00049 {
00050  public:
00051     /** Create a DbgMCU dummy object */
00052         DbgMCU(void) {
00053         /* the following code is NOT portable */
00054                 volatile uint32_t *dbgmcu_creg = (uint32_t*)0xE0042004;
00055                 uint32_t tmp = *dbgmcu_creg;
00056         
00057         tmp &= ~(0xE7);
00058         tmp |= 0x27; // Set asynchronous communication via DBGMCU_CR (for ITM/printf)
00059         // tmp |= 0xE7; // Set 4-pin tracing via DBGMCU_CR (for ETM)
00060                 *dbgmcu_creg = tmp;
00061     }
00062 };
00063 
00064 #endif /* __DBG_MCU_H */