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/BusIn.h

Committer:
mega64
Date:
2017-04-27
Revision:
148:8b0b02bf146f
Parent:
146:03e976389d16

File content as of revision 148:8b0b02bf146f:

/* 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.
 */
#ifndef MBED_BUSIN_H
#define MBED_BUSIN_H

#include "platform/platform.h"
#include "drivers/DigitalIn.h"
#include "platform/PlatformMutex.h"

namespace mbed {
/** \addtogroup drivers */
/** @{*/

/** A digital input bus, used for reading the state of a collection of pins
 *
 * @Note Synchronization level: Thread safe
 */
class BusIn {

public:
    /* Group: Configuration Methods */

    /** Create an BusIn, connected to the specified pins
     *
     * @param <n> DigitalIn pin to connect to bus bit <n> (p5-p30, NC)
     *
     * @note
     *  It is only required to specify as many pin variables as is required
     *  for the bus; the rest will default to NC (not connected)
     */
    BusIn(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC,
          PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC,
          PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC,
          PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC);

    BusIn(PinName pins[16]);

    virtual ~BusIn();

    /** Read the value of the input bus
     *
     *  @returns
     *   An integer with each bit corresponding to the value read from the associated DigitalIn pin
     */
    int read();

    /** Set the input pin mode
     *
     *  @param mode PullUp, PullDown, PullNone
     */
    void mode(PinMode pull);

    /** Binary mask of bus pins connected to actual pins (not NC pins)
     *  If bus pin is in NC state make corresponding bit will be cleared (set to 0), else bit will be set to 1
     *
     *  @returns
     *    Binary mask of connected pins
     */
    int mask() {
        // No lock needed since _nc_mask is not modified outside the constructor
        return _nc_mask;
    }

    /** A shorthand for read()
     */
    operator int();

    /** Access to particular bit in random-iterator fashion
     */
    DigitalIn & operator[] (int index);

protected:
    DigitalIn* _pin[16];

    /** Mask of bus's NC pins
     * If bit[n] is set to 1 - pin is connected
     * if bit[n] is cleared - pin is not connected (NC)
     */
    int _nc_mask;

    PlatformMutex _mutex;

    /* disallow copy constructor and assignment operators */
private:
    virtual void lock();
    virtual void unlock();
    BusIn(const BusIn&);
    BusIn & operator = (const BusIn&);
};

} // namespace mbed

#endif

/** @}*/