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)

drivers/RawSerial.cpp@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 /* mbed Microcontroller Library
mega64 146:03e976389d16 2 * Copyright (c) 2006-2013 ARM Limited
mega64 146:03e976389d16 3 *
mega64 146:03e976389d16 4 * Licensed under the Apache License, Version 2.0 (the "License");
mega64 146:03e976389d16 5 * you may not use this file except in compliance with the License.
mega64 146:03e976389d16 6 * You may obtain a copy of the License at
mega64 146:03e976389d16 7 *
mega64 146:03e976389d16 8 * http://www.apache.org/licenses/LICENSE-2.0
mega64 146:03e976389d16 9 *
mega64 146:03e976389d16 10 * Unless required by applicable law or agreed to in writing, software
mega64 146:03e976389d16 11 * distributed under the License is distributed on an "AS IS" BASIS,
mega64 146:03e976389d16 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mega64 146:03e976389d16 13 * See the License for the specific language governing permissions and
mega64 146:03e976389d16 14 * limitations under the License.
mega64 146:03e976389d16 15 */
mega64 146:03e976389d16 16 #include "drivers/RawSerial.h"
mega64 146:03e976389d16 17 #include "platform/mbed_wait_api.h"
mega64 146:03e976389d16 18 #include <cstdarg>
mega64 146:03e976389d16 19
mega64 146:03e976389d16 20 #if DEVICE_SERIAL
mega64 146:03e976389d16 21
mega64 146:03e976389d16 22 #define STRING_STACK_LIMIT 120
mega64 146:03e976389d16 23
mega64 146:03e976389d16 24 namespace mbed {
mega64 146:03e976389d16 25
mega64 146:03e976389d16 26 RawSerial::RawSerial(PinName tx, PinName rx, int baud) : SerialBase(tx, rx, baud) {
mega64 146:03e976389d16 27 // No lock needed in the constructor
mega64 146:03e976389d16 28 }
mega64 146:03e976389d16 29
mega64 146:03e976389d16 30 int RawSerial::getc() {
mega64 146:03e976389d16 31 lock();
mega64 146:03e976389d16 32 int ret = _base_getc();
mega64 146:03e976389d16 33 unlock();
mega64 146:03e976389d16 34 return ret;
mega64 146:03e976389d16 35 }
mega64 146:03e976389d16 36
mega64 146:03e976389d16 37 int RawSerial::putc(int c) {
mega64 146:03e976389d16 38 lock();
mega64 146:03e976389d16 39 int ret = _base_putc(c);
mega64 146:03e976389d16 40 unlock();
mega64 146:03e976389d16 41 return ret;
mega64 146:03e976389d16 42 }
mega64 146:03e976389d16 43
mega64 146:03e976389d16 44 int RawSerial::puts(const char *str) {
mega64 146:03e976389d16 45 lock();
mega64 146:03e976389d16 46 while (*str)
mega64 146:03e976389d16 47 putc(*str ++);
mega64 146:03e976389d16 48 unlock();
mega64 146:03e976389d16 49 return 0;
mega64 146:03e976389d16 50 }
mega64 146:03e976389d16 51
mega64 146:03e976389d16 52 // Experimental support for printf in RawSerial. No Stream inheritance
mega64 146:03e976389d16 53 // means we can't call printf() directly, so we use sprintf() instead.
mega64 146:03e976389d16 54 // We only call malloc() for the sprintf() buffer if the buffer
mega64 146:03e976389d16 55 // length is above a certain threshold, otherwise we use just the stack.
mega64 146:03e976389d16 56 int RawSerial::printf(const char *format, ...) {
mega64 146:03e976389d16 57 lock();
mega64 146:03e976389d16 58 std::va_list arg;
mega64 146:03e976389d16 59 va_start(arg, format);
mega64 146:03e976389d16 60 // ARMCC microlib does not properly handle a size of 0.
mega64 146:03e976389d16 61 // As a workaround supply a dummy buffer with a size of 1.
mega64 146:03e976389d16 62 char dummy_buf[1];
mega64 146:03e976389d16 63 int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
mega64 146:03e976389d16 64 if (len < STRING_STACK_LIMIT) {
mega64 146:03e976389d16 65 char temp[STRING_STACK_LIMIT];
mega64 146:03e976389d16 66 vsprintf(temp, format, arg);
mega64 146:03e976389d16 67 puts(temp);
mega64 146:03e976389d16 68 } else {
mega64 146:03e976389d16 69 char *temp = new char[len + 1];
mega64 146:03e976389d16 70 vsprintf(temp, format, arg);
mega64 146:03e976389d16 71 puts(temp);
mega64 146:03e976389d16 72 delete[] temp;
mega64 146:03e976389d16 73 }
mega64 146:03e976389d16 74 va_end(arg);
mega64 146:03e976389d16 75 unlock();
mega64 146:03e976389d16 76 return len;
mega64 146:03e976389d16 77 }
mega64 146:03e976389d16 78
mega64 146:03e976389d16 79 /** Acquire exclusive access to this serial port
mega64 146:03e976389d16 80 */
mega64 146:03e976389d16 81 void RawSerial::lock() {
mega64 146:03e976389d16 82 // No lock used - external synchronization required
mega64 146:03e976389d16 83 }
mega64 146:03e976389d16 84
mega64 146:03e976389d16 85 /** Release exclusive access to this serial port
mega64 146:03e976389d16 86 */
mega64 146:03e976389d16 87 void RawSerial::unlock() {
mega64 146:03e976389d16 88 // No lock used - external synchronization required
mega64 146:03e976389d16 89 }
mega64 146:03e976389d16 90
mega64 146:03e976389d16 91 } // namespace mbed
mega64 146:03e976389d16 92
mega64 146:03e976389d16 93 #endif