Nothing Special / mbed-STM32F103C8

Modification of Mbed-dev library for LQFP48 package microcontrollers: STM32F103C8 (STM32F103C8T6) and STM32F103CB (STM32F103CBT6) (Bluepill boards, Maple mini etc. )

Fork of mbed-STM32F103C8_org by Nothing Special

Library for STM32F103C8 (Bluepill boards etc.).
Use this instead of mbed library.
This library allows the size of the code in the FLASH up to 128kB. Therefore, code also runs on microcontrollers STM32F103CB (eg. Maple mini).
But in the case of STM32F103C8, check the size of the resulting code would not exceed 64kB.

To compile a program with this library, use NUCLEO-F103RB as the target name. !

Changes:

  • Corrected initialization of the HSE + crystal clock (mbed permanent bug), allowing the use of on-board xtal (8MHz).(1)
  • Additionally, it also set USB clock (48Mhz).(2)
  • Definitions of pins and peripherals adjusted to LQFP48 case.
  • Board led LED1 is now PC_13 (3)
  • USER_BUTTON is now PC_14 (4)

    Now the library is complete rebuilt based on mbed-dev v160 (and not yet fully tested).

notes
(1) - In case 8MHz xtal on board, CPU frequency is 72MHz. Without xtal is 64MHz.
(2) - Using the USB interface is only possible if STM32 is clocking by on-board 8MHz xtal or external clock signal 8MHz on the OSC_IN pin.
(3) - On Bluepill board led operation is reversed, i.e. 0 - led on, 1 - led off.
(4) - Bluepill board has no real user button

Information

After export to SW4STM (AC6):

  • add line #include "mbed_config.h" in files Serial.h and RawSerial.h
  • in project properties change Optimisation Level to Optimise for size (-Os)

platform/mbed_semihost_api.h@148:8b0b02bf146f, 2017-04-27 (annotated)

Committer:
mega64
Date:
Thu Apr 27 23:56:38 2017 +0000
Revision:
148:8b0b02bf146f
Parent:
146:03e976389d16 
Remove unnecessary folders

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mega64 146:03e976389d16 1
mega64 146:03e976389d16 2 /** \addtogroup platform */
mega64 146:03e976389d16 3 /** @{*/
mega64 146:03e976389d16 4 /* mbed Microcontroller Library
mega64 146:03e976389d16 5 * Copyright (c) 2006-2013 ARM Limited
mega64 146:03e976389d16 6 *
mega64 146:03e976389d16 7 * Licensed under the Apache License, Version 2.0 (the "License");
mega64 146:03e976389d16 8 * you may not use this file except in compliance with the License.
mega64 146:03e976389d16 9 * You may obtain a copy of the License at
mega64 146:03e976389d16 10 *
mega64 146:03e976389d16 11 * http://www.apache.org/licenses/LICENSE-2.0
mega64 146:03e976389d16 12 *
mega64 146:03e976389d16 13 * Unless required by applicable law or agreed to in writing, software
mega64 146:03e976389d16 14 * distributed under the License is distributed on an "AS IS" BASIS,
mega64 146:03e976389d16 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mega64 146:03e976389d16 16 * See the License for the specific language governing permissions and
mega64 146:03e976389d16 17 * limitations under the License.
mega64 146:03e976389d16 18 */
mega64 146:03e976389d16 19 #ifndef MBED_SEMIHOST_H
mega64 146:03e976389d16 20 #define MBED_SEMIHOST_H
mega64 146:03e976389d16 21
mega64 146:03e976389d16 22 #include "device.h"
mega64 146:03e976389d16 23 #include "platform/mbed_toolchain.h"
mega64 146:03e976389d16 24
mega64 146:03e976389d16 25 #ifdef __cplusplus
mega64 146:03e976389d16 26 extern "C" {
mega64 146:03e976389d16 27 #endif
mega64 146:03e976389d16 28
mega64 146:03e976389d16 29 #if DEVICE_SEMIHOST
mega64 146:03e976389d16 30
mega64 146:03e976389d16 31 #ifndef __CC_ARM
mega64 146:03e976389d16 32
mega64 146:03e976389d16 33 #if defined(__ICCARM__)
mega64 146:03e976389d16 34 static inline int __semihost(int reason, const void *arg) {
mega64 146:03e976389d16 35 return __semihosting(reason, (void*)arg);
mega64 146:03e976389d16 36 }
mega64 146:03e976389d16 37 #else
mega64 146:03e976389d16 38
mega64 146:03e976389d16 39 #ifdef __thumb__
mega64 146:03e976389d16 40 # define AngelSWI 0xAB
mega64 146:03e976389d16 41 # define AngelSWIInsn "bkpt"
mega64 146:03e976389d16 42 # define AngelSWIAsm bkpt
mega64 146:03e976389d16 43 #else
mega64 146:03e976389d16 44 # define AngelSWI 0x123456
mega64 146:03e976389d16 45 # define AngelSWIInsn "swi"
mega64 146:03e976389d16 46 # define AngelSWIAsm swi
mega64 146:03e976389d16 47 #endif
mega64 146:03e976389d16 48
mega64 146:03e976389d16 49 static inline int __semihost(int reason, const void *arg) {
mega64 146:03e976389d16 50 int value;
mega64 146:03e976389d16 51
mega64 146:03e976389d16 52 asm volatile (
mega64 146:03e976389d16 53 "mov r0, %1" "\n\t"
mega64 146:03e976389d16 54 "mov r1, %2" "\n\t"
mega64 146:03e976389d16 55 AngelSWIInsn " %a3" "\n\t"
mega64 146:03e976389d16 56 "mov %0, r0"
mega64 146:03e976389d16 57 : "=r" (value) /* output operands */
mega64 146:03e976389d16 58 : "r" (reason), "r" (arg), "i" (AngelSWI) /* input operands */
mega64 146:03e976389d16 59 : "r0", "r1", "r2", "r3", "ip", "lr", "memory", "cc" /* list of clobbered registers */
mega64 146:03e976389d16 60 );
mega64 146:03e976389d16 61
mega64 146:03e976389d16 62 return value;
mega64 146:03e976389d16 63 }
mega64 146:03e976389d16 64 #endif
mega64 146:03e976389d16 65 #endif
mega64 146:03e976389d16 66
mega64 146:03e976389d16 67 #if DEVICE_LOCALFILESYSTEM
mega64 146:03e976389d16 68 FILEHANDLE semihost_open(const char* name, int openmode);
mega64 146:03e976389d16 69 int semihost_close (FILEHANDLE fh);
mega64 146:03e976389d16 70 int semihost_read (FILEHANDLE fh, unsigned char* buffer, unsigned int length, int mode);
mega64 146:03e976389d16 71 int semihost_write (FILEHANDLE fh, const unsigned char* buffer, unsigned int length, int mode);
mega64 146:03e976389d16 72 int semihost_ensure(FILEHANDLE fh);
mega64 146:03e976389d16 73 long semihost_flen (FILEHANDLE fh);
mega64 146:03e976389d16 74 int semihost_seek (FILEHANDLE fh, long position);
mega64 146:03e976389d16 75 int semihost_istty (FILEHANDLE fh);
mega64 146:03e976389d16 76
mega64 146:03e976389d16 77 int semihost_remove(const char *name);
mega64 146:03e976389d16 78 int semihost_rename(const char *old_name, const char *new_name);
mega64 146:03e976389d16 79 #endif
mega64 146:03e976389d16 80
mega64 146:03e976389d16 81 int semihost_uid(char *uid);
mega64 146:03e976389d16 82 int semihost_reset(void);
mega64 146:03e976389d16 83 int semihost_vbus(void);
mega64 146:03e976389d16 84 int semihost_powerdown(void);
mega64 146:03e976389d16 85 int semihost_exit(void);
mega64 146:03e976389d16 86
mega64 146:03e976389d16 87 int semihost_connected(void);
mega64 146:03e976389d16 88 int semihost_disabledebug(void);
mega64 146:03e976389d16 89
mega64 146:03e976389d16 90 #endif
mega64 146:03e976389d16 91
mega64 146:03e976389d16 92 #ifdef __cplusplus
mega64 146:03e976389d16 93 }
mega64 146:03e976389d16 94 #endif
mega64 146:03e976389d16 95
mega64 146:03e976389d16 96 #endif
mega64 146:03e976389d16 97
mega64 146:03e976389d16 98 /** @}*/