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/* mbed Microcontroller Library
* Copyright (c) 2006-2013 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "cmsis.h"
#include "semihost_api.h"
#include <stdint.h>
#include <string.h>
#if DEVICE_SEMIHOST
// ARM Semihosting Commands
#define SYS_OPEN (0x1)
#define SYS_CLOSE (0x2)
#define SYS_WRITE (0x5)
#define SYS_READ (0x6)
#define SYS_ISTTY (0x9)
#define SYS_SEEK (0xa)
#define SYS_ENSURE (0xb)
#define SYS_FLEN (0xc)
#define SYS_REMOVE (0xe)
#define SYS_RENAME (0xf)
#define SYS_EXIT (0x18)
// mbed Semihosting Commands
#define RESERVED_FOR_USER_APPLICATIONS (0x100) // 0x100 - 0x1ff
#define USR_XFFIND (RESERVED_FOR_USER_APPLICATIONS + 0)
#define USR_UID (RESERVED_FOR_USER_APPLICATIONS + 1)
#define USR_RESET (RESERVED_FOR_USER_APPLICATIONS + 2)
#define USR_VBUS (RESERVED_FOR_USER_APPLICATIONS + 3)
#define USR_POWERDOWN (RESERVED_FOR_USER_APPLICATIONS + 4)
#define USR_DISABLEDEBUG (RESERVED_FOR_USER_APPLICATIONS + 5)
#if DEVICE_LOCALFILESYSTEM
FILEHANDLE semihost_open(const char* name, int openmode) {
uint32_t args[3];
args[0] = (uint32_t)name;
args[1] = (uint32_t)openmode;
args[2] = (uint32_t)strlen(name);
return __semihost(SYS_OPEN, args);
}
int semihost_close(FILEHANDLE fh) {
return __semihost(SYS_CLOSE, &fh);
}
int semihost_write(FILEHANDLE fh, const unsigned char* buffer, unsigned int length, int mode) {
if (length == 0) return 0;
uint32_t args[3];
args[0] = (uint32_t)fh;
args[1] = (uint32_t)buffer;
args[2] = (uint32_t)length;
return __semihost(SYS_WRITE, args);
}
int semihost_read(FILEHANDLE fh, unsigned char* buffer, unsigned int length, int mode) {
uint32_t args[3];
args[0] = (uint32_t)fh;
args[1] = (uint32_t)buffer;
args[2] = (uint32_t)length;
return __semihost(SYS_READ, args);
}
int semihost_istty(FILEHANDLE fh) {
return __semihost(SYS_ISTTY, &fh);
}
int semihost_seek(FILEHANDLE fh, long position) {
uint32_t args[2];
args[0] = (uint32_t)fh;
args[1] = (uint32_t)position;
return __semihost(SYS_SEEK, args);
}
int semihost_ensure(FILEHANDLE fh) {
return __semihost(SYS_ENSURE, &fh);
}
long semihost_flen(FILEHANDLE fh) {
return __semihost(SYS_FLEN, &fh);
}
int semihost_remove(const char *name) {
uint32_t args[2];
args[0] = (uint32_t)name;
args[1] = (uint32_t)strlen(name);
return __semihost(SYS_REMOVE, args);
}
int semihost_rename(const char *old_name, const char *new_name) {
uint32_t args[4];
args[0] = (uint32_t)old_name;
args[1] = (uint32_t)strlen(old_name);
args[0] = (uint32_t)new_name;
args[1] = (uint32_t)strlen(new_name);
return __semihost(SYS_RENAME, args);
}
#endif
int semihost_exit(void) {
uint32_t args[4];
return __semihost(SYS_EXIT, args);
}
int semihost_uid(char *uid) {
uint32_t args[2];
args[0] = (uint32_t)uid;
args[1] = DEVICE_ID_LENGTH + 1;
return __semihost(USR_UID, &args);
}
int semihost_reset(void) {
// Does not normally return, however if used with older firmware versions
// that do not support this call it will return -1.
return __semihost(USR_RESET, NULL);
}
int semihost_vbus(void) {
return __semihost(USR_VBUS, NULL);
}
int semihost_powerdown(void) {
return __semihost(USR_POWERDOWN, NULL);
}
#if DEVICE_DEBUG_AWARENESS
int semihost_connected(void) {
return (CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) ? 1 : 0;
}
#else
// These processors cannot know if the interface is connect, assume so:
static int is_debugger_attached = 1;
int semihost_connected(void) {
return is_debugger_attached;
}
#endif
int semihost_disabledebug(void) {
#if !(DEVICE_DEBUG_AWARENESS)
is_debugger_attached = 0;
#endif
return __semihost(USR_DISABLEDEBUG, NULL);
}
#endif
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