tmk_core/tool/mbed/mbed-sdk/libraries/mbed/common/semihost_api.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #include "cmsis.h"
  17 #include "semihost_api.h"
  18
  19 #include <stdint.h>
  20 #include <string.h>
  21
  22 #if DEVICE_SEMIHOST
  23
  24 // ARM Semihosting Commands
  25 #define SYS_OPEN   (0x1)
  26 #define SYS_CLOSE  (0x2)
  27 #define SYS_WRITE  (0x5)
  28 #define SYS_READ   (0x6)
  29 #define SYS_ISTTY  (0x9)
  30 #define SYS_SEEK   (0xa)
  31 #define SYS_ENSURE (0xb)
  32 #define SYS_FLEN   (0xc)
  33 #define SYS_REMOVE (0xe)
  34 #define SYS_RENAME (0xf)
  35 #define SYS_EXIT   (0x18)
  36
  37 // mbed Semihosting Commands
  38 #define RESERVED_FOR_USER_APPLICATIONS (0x100) // 0x100 - 0x1ff
  39 #define USR_XFFIND      (RESERVED_FOR_USER_APPLICATIONS + 0)
  40 #define USR_UID      (RESERVED_FOR_USER_APPLICATIONS + 1)
  41 #define USR_RESET     (RESERVED_FOR_USER_APPLICATIONS + 2)
  42 #define USR_VBUS     (RESERVED_FOR_USER_APPLICATIONS + 3)
  43 #define USR_POWERDOWN     (RESERVED_FOR_USER_APPLICATIONS + 4)
  44 #define USR_DISABLEDEBUG (RESERVED_FOR_USER_APPLICATIONS + 5)
  45
  46 #if DEVICE_LOCALFILESYSTEM
  47 FILEHANDLE semihost_open(const char* name, int openmode) {
  48     uint32_t args[3];
  49     args[0] = (uint32_t)name;
  50     args[1] = (uint32_t)openmode;
  51     args[2] = (uint32_t)strlen(name);
  52     return __semihost(SYS_OPEN, args);
  53 }
  54
  55 int semihost_close(FILEHANDLE fh) {
  56     return __semihost(SYS_CLOSE, &fh);
  57 }
  58
  59 int semihost_write(FILEHANDLE fh, const unsigned char* buffer, unsigned int length, int mode) {
  60     if (length == 0) return 0;
  61
  62     uint32_t args[3];
  63     args[0] = (uint32_t)fh;
  64     args[1] = (uint32_t)buffer;
  65     args[2] = (uint32_t)length;
  66     return __semihost(SYS_WRITE, args);
  67 }
  68
  69 int semihost_read(FILEHANDLE fh, unsigned char* buffer, unsigned int length, int mode) {
  70     uint32_t args[3];
  71     args[0] = (uint32_t)fh;
  72     args[1] = (uint32_t)buffer;
  73     args[2] = (uint32_t)length;
  74     return __semihost(SYS_READ, args);
  75 }
  76
  77 int semihost_istty(FILEHANDLE fh) {
  78     return __semihost(SYS_ISTTY, &fh);
  79 }
  80
  81 int semihost_seek(FILEHANDLE fh, long position) {
  82     uint32_t args[2];
  83     args[0] = (uint32_t)fh;
  84     args[1] = (uint32_t)position;
  85     return __semihost(SYS_SEEK, args);
  86 }
  87
  88 int semihost_ensure(FILEHANDLE fh) {
  89     return __semihost(SYS_ENSURE, &fh);
  90 }
  91
  92 long semihost_flen(FILEHANDLE fh) {
  93     return __semihost(SYS_FLEN, &fh);
  94 }
  95
  96 int semihost_remove(const char *name) {
  97     uint32_t args[2];
  98     args[0] = (uint32_t)name;
  99     args[1] = (uint32_t)strlen(name);
 100     return __semihost(SYS_REMOVE, args);
 101 }
 102
 103 int semihost_rename(const char *old_name, const char *new_name) {
 104     uint32_t args[4];
 105     args[0] = (uint32_t)old_name;
 106     args[1] = (uint32_t)strlen(old_name);
 107     args[0] = (uint32_t)new_name;
 108     args[1] = (uint32_t)strlen(new_name);
 109     return __semihost(SYS_RENAME, args);
 110 }
 111 #endif
 112
 113 int semihost_exit(void) {
 114     uint32_t args[4];
 115     return __semihost(SYS_EXIT, args);
 116 }
 117
 118 int semihost_uid(char *uid) {
 119     uint32_t args[2];
 120     args[0] = (uint32_t)uid;
 121     args[1] = DEVICE_ID_LENGTH + 1;
 122     return __semihost(USR_UID, &args);
 123 }
 124
 125 int semihost_reset(void) {
 126     // Does not normally return, however if used with older firmware versions
 127     // that do not support this call it will return -1.
 128     return __semihost(USR_RESET, NULL);
 129 }
 130
 131 int semihost_vbus(void) {
 132     return __semihost(USR_VBUS, NULL);
 133 }
 134
 135 int semihost_powerdown(void) {
 136     return __semihost(USR_POWERDOWN, NULL);
 137 }
 138
 139 #if DEVICE_DEBUG_AWARENESS
 140
 141 int semihost_connected(void) {
 142     return (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ? 1 : 0;
 143 }
 144
 145 #else
 146 // These processors cannot know if the interface is connect, assume so:
 147 static int is_debugger_attached = 1;
 148
 149 int semihost_connected(void) {
 150     return is_debugger_attached;
 151 }
 152 #endif
 153
 154 int semihost_disabledebug(void) {
 155 #if !(DEVICE_DEBUG_AWARENESS)
 156     is_debugger_attached = 0;
 157 #endif
 158     return __semihost(USR_DISABLEDEBUG, NULL);
 159 }
 160
 161 #endif
 162