Generic mbed Extensions used by STM Expansion Board Firmware Packages

Diff: DbgMCU/DbgMCU.h

Revision:

1:ca975408dd4e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DbgMCU/DbgMCU.h	Thu Apr 02 13:23:09 2015 +0200
@@ -0,0 +1,64 @@
+/**
+ ******************************************************************************
+ * @file    DbgMCU.h
+ * @author  AST / EST
+ * @version V0.0.1
+ * @date    30-March-2015
+ * @brief   Header file for enabling debugging in sleep modes for STM32 MCUs
+ ******************************************************************************
+ * @attention
+ *
+ * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *   1. Redistributions of source code must retain the above copyright notice,
+ *      this list of conditions and the following disclaimer.
+ *   2. Redistributions in binary form must reproduce the above copyright notice,
+ *      this list of conditions and the following disclaimer in the documentation
+ *      and/or other materials provided with the distribution.
+ *   3. Neither the name of STMicroelectronics nor the names of its contributors
+ *      may be used to endorse or promote products derived from this software
+ *      without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ ******************************************************************************
+ */
+
+/* Define to prevent from recursive inclusion --------------------------------*/
+#ifndef __DBG_MCU_H
+#define __DBG_MCU_H
+
+/* Includes ------------------------------------------------------------------*/
+
+/* Classes -------------------------------------------------------------------*/
+/** Helper class DbgMCU providing a default constructor which enables debugging
+ *  on STM32 MCUs while using sleep modes.
+ */
+class DbgMCU
+{
+ public:
+	/** Create a DbgMCU dummy object */
+        DbgMCU(void) {
+		/* the following code is NOT portable */
+                volatile uint32_t *dbgmcu_creg = (uint32_t*)0xE0042004;
+                uint32_t tmp = *dbgmcu_creg;
+		
+		tmp &= ~(0xE7);
+		tmp |= 0x27; // Set asynchronous communication via DBGMCU_CR (for ITM/printf)
+		// tmp |= 0xE7; // Set 4-pin tracing via DBGMCU_CR (for ETM)
+                *dbgmcu_creg = tmp;
+	}
+};
+
+#endif /* __DBG_MCU_H */