mbed library sources
Dependents: STM32F103C8T6-RangoTec STM32-103C8_Plantilla_USB
Diff: common/semihost_api.c
- Revision:
- 9:0ce32e54c9a7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/common/semihost_api.c Mon Jun 10 16:03:00 2013 +0100 @@ -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 "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 +