Diff: platform/mbed_semihost_api.c

Revision:

0:f269e3021894

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/platform/mbed_semihost_api.c	Sun Oct 23 15:10:02 2016 +0000
@@ -0,0 +1,162 @@
+/* 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 "platform/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
+