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api/semihost_api.h@128:c31e94a47539, 2016-05-13 (annotated)

Committer:
mbed_official
Date:
Fri May 13 16:00:11 2016 +0100
Revision:
128:c31e94a47539
Parent:
0:9b334a45a8ff
Child:
134:c5ba39804b6b
Synchronized with git revision 7bd986845c110b2c4e8bc58739a74757dd6ff493



Full URL: https://github.com/mbedmicro/mbed/commit/7bd986845c110b2c4e8bc58739a74757dd6ff493/



* [STM32F1 F4] Fix #1705 MBED_37



The transmit data register needs to be flushed at the initialisation of

the uart.

In case previous transmission was interrupted by a uart init, uart may

contain a char that will be transmitted at the next start.



This is the case in MBED_37 test (serial_auto_nc_rx).

The MCU is writting {{start}}\n

At the moment of the \n the main program is handling 'new serial'. The

next time the main program is handling a printf, the previous \n is

still present in the uart->DR register and is transmitted.

This cannot happen anymore with this commit



* [STM32_F1] Fix #1705 MBED_37 by resetting the uart

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:9b334a45a8ff 5 * you may not use this file except in compliance with the License.
bogdanm 0:9b334a45a8ff 6 * You may obtain a copy of the License at
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:9b334a45a8ff 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:9b334a45a8ff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:9b334a45a8ff 13 * See the License for the specific language governing permissions and
bogdanm 0:9b334a45a8ff 14 * limitations under the License.
bogdanm 0:9b334a45a8ff 15 */
bogdanm 0:9b334a45a8ff 16 #ifndef MBED_SEMIHOST_H
bogdanm 0:9b334a45a8ff 17 #define MBED_SEMIHOST_H
bogdanm 0:9b334a45a8ff 18
bogdanm 0:9b334a45a8ff 19 #include "device.h"
bogdanm 0:9b334a45a8ff 20 #include "toolchain.h"
bogdanm 0:9b334a45a8ff 21
bogdanm 0:9b334a45a8ff 22 #ifdef __cplusplus
bogdanm 0:9b334a45a8ff 23 extern "C" {
bogdanm 0:9b334a45a8ff 24 #endif
bogdanm 0:9b334a45a8ff 25
bogdanm 0:9b334a45a8ff 26 #if DEVICE_SEMIHOST
bogdanm 0:9b334a45a8ff 27
bogdanm 0:9b334a45a8ff 28 #ifndef __CC_ARM
bogdanm 0:9b334a45a8ff 29
bogdanm 0:9b334a45a8ff 30 #if defined(__ICCARM__)
bogdanm 0:9b334a45a8ff 31 inline int __semihost(int reason, const void *arg) {
bogdanm 0:9b334a45a8ff 32 return __semihosting(reason, (void*)arg);
bogdanm 0:9b334a45a8ff 33 }
bogdanm 0:9b334a45a8ff 34 #else
bogdanm 0:9b334a45a8ff 35
bogdanm 0:9b334a45a8ff 36 #ifdef __thumb__
bogdanm 0:9b334a45a8ff 37 # define AngelSWI 0xAB
bogdanm 0:9b334a45a8ff 38 # define AngelSWIInsn "bkpt"
bogdanm 0:9b334a45a8ff 39 # define AngelSWIAsm bkpt
bogdanm 0:9b334a45a8ff 40 #else
bogdanm 0:9b334a45a8ff 41 # define AngelSWI 0x123456
bogdanm 0:9b334a45a8ff 42 # define AngelSWIInsn "swi"
bogdanm 0:9b334a45a8ff 43 # define AngelSWIAsm swi
bogdanm 0:9b334a45a8ff 44 #endif
bogdanm 0:9b334a45a8ff 45
bogdanm 0:9b334a45a8ff 46 static inline int __semihost(int reason, const void *arg) {
bogdanm 0:9b334a45a8ff 47 int value;
bogdanm 0:9b334a45a8ff 48
bogdanm 0:9b334a45a8ff 49 asm volatile (
bogdanm 0:9b334a45a8ff 50 "mov r0, %1" "\n\t"
bogdanm 0:9b334a45a8ff 51 "mov r1, %2" "\n\t"
bogdanm 0:9b334a45a8ff 52 AngelSWIInsn " %a3" "\n\t"
bogdanm 0:9b334a45a8ff 53 "mov %0, r0"
bogdanm 0:9b334a45a8ff 54 : "=r" (value) /* output operands */
bogdanm 0:9b334a45a8ff 55 : "r" (reason), "r" (arg), "i" (AngelSWI) /* input operands */
bogdanm 0:9b334a45a8ff 56 : "r0", "r1", "r2", "r3", "ip", "lr", "memory", "cc" /* list of clobbered registers */
bogdanm 0:9b334a45a8ff 57 );
bogdanm 0:9b334a45a8ff 58
bogdanm 0:9b334a45a8ff 59 return value;
bogdanm 0:9b334a45a8ff 60 }
bogdanm 0:9b334a45a8ff 61 #endif
bogdanm 0:9b334a45a8ff 62 #endif
bogdanm 0:9b334a45a8ff 63
bogdanm 0:9b334a45a8ff 64 #if DEVICE_LOCALFILESYSTEM
bogdanm 0:9b334a45a8ff 65 FILEHANDLE semihost_open(const char* name, int openmode);
bogdanm 0:9b334a45a8ff 66 int semihost_close (FILEHANDLE fh);
bogdanm 0:9b334a45a8ff 67 int semihost_read (FILEHANDLE fh, unsigned char* buffer, unsigned int length, int mode);
bogdanm 0:9b334a45a8ff 68 int semihost_write (FILEHANDLE fh, const unsigned char* buffer, unsigned int length, int mode);
bogdanm 0:9b334a45a8ff 69 int semihost_ensure(FILEHANDLE fh);
bogdanm 0:9b334a45a8ff 70 long semihost_flen (FILEHANDLE fh);
bogdanm 0:9b334a45a8ff 71 int semihost_seek (FILEHANDLE fh, long position);
bogdanm 0:9b334a45a8ff 72 int semihost_istty (FILEHANDLE fh);
bogdanm 0:9b334a45a8ff 73
bogdanm 0:9b334a45a8ff 74 int semihost_remove(const char *name);
bogdanm 0:9b334a45a8ff 75 int semihost_rename(const char *old_name, const char *new_name);
bogdanm 0:9b334a45a8ff 76 #endif
bogdanm 0:9b334a45a8ff 77
bogdanm 0:9b334a45a8ff 78 int semihost_uid(char *uid);
bogdanm 0:9b334a45a8ff 79 int semihost_reset(void);
bogdanm 0:9b334a45a8ff 80 int semihost_vbus(void);
bogdanm 0:9b334a45a8ff 81 int semihost_powerdown(void);
bogdanm 0:9b334a45a8ff 82 int semihost_exit(void);
bogdanm 0:9b334a45a8ff 83
bogdanm 0:9b334a45a8ff 84 int semihost_connected(void);
bogdanm 0:9b334a45a8ff 85 int semihost_disabledebug(void);
bogdanm 0:9b334a45a8ff 86
bogdanm 0:9b334a45a8ff 87 #endif
bogdanm 0:9b334a45a8ff 88
bogdanm 0:9b334a45a8ff 89 #ifdef __cplusplus
bogdanm 0:9b334a45a8ff 90 }
bogdanm 0:9b334a45a8ff 91 #endif
bogdanm 0:9b334a45a8ff 92
bogdanm 0:9b334a45a8ff 93 #endif