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.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/BusIn.h"
mega64 146:03e976389d16 17 #include "platform/mbed_assert.h"
mega64 146:03e976389d16 18
mega64 146:03e976389d16 19 namespace mbed {
mega64 146:03e976389d16 20
mega64 146:03e976389d16 21 BusIn::BusIn(PinName p0, PinName p1, PinName p2, PinName p3, PinName p4, PinName p5, PinName p6, PinName p7, PinName p8, PinName p9, PinName p10, PinName p11, PinName p12, PinName p13, PinName p14, PinName p15) {
mega64 146:03e976389d16 22 PinName pins[16] = {p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15};
mega64 146:03e976389d16 23
mega64 146:03e976389d16 24 // No lock needed in the constructor
mega64 146:03e976389d16 25 _nc_mask = 0;
mega64 146:03e976389d16 26 for (int i=0; i<16; i++) {
mega64 146:03e976389d16 27 _pin[i] = (pins[i] != NC) ? new DigitalIn(pins[i]) : 0;
mega64 146:03e976389d16 28 if (pins[i] != NC) {
mega64 146:03e976389d16 29 _nc_mask |= (1 << i);
mega64 146:03e976389d16 30 }
mega64 146:03e976389d16 31 }
mega64 146:03e976389d16 32 }
mega64 146:03e976389d16 33
mega64 146:03e976389d16 34 BusIn::BusIn(PinName pins[16]) {
mega64 146:03e976389d16 35 // No lock needed in the constructor
mega64 146:03e976389d16 36 _nc_mask = 0;
mega64 146:03e976389d16 37 for (int i=0; i<16; i++) {
mega64 146:03e976389d16 38 _pin[i] = (pins[i] != NC) ? new DigitalIn(pins[i]) : 0;
mega64 146:03e976389d16 39 if (pins[i] != NC) {
mega64 146:03e976389d16 40 _nc_mask |= (1 << i);
mega64 146:03e976389d16 41 }
mega64 146:03e976389d16 42 }
mega64 146:03e976389d16 43 }
mega64 146:03e976389d16 44
mega64 146:03e976389d16 45 BusIn::~BusIn() {
mega64 146:03e976389d16 46 // No lock needed in the destructor
mega64 146:03e976389d16 47 for (int i=0; i<16; i++) {
mega64 146:03e976389d16 48 if (_pin[i] != 0) {
mega64 146:03e976389d16 49 delete _pin[i];
mega64 146:03e976389d16 50 }
mega64 146:03e976389d16 51 }
mega64 146:03e976389d16 52 }
mega64 146:03e976389d16 53
mega64 146:03e976389d16 54 int BusIn::read() {
mega64 146:03e976389d16 55 int v = 0;
mega64 146:03e976389d16 56 lock();
mega64 146:03e976389d16 57 for (int i=0; i<16; i++) {
mega64 146:03e976389d16 58 if (_pin[i] != 0) {
mega64 146:03e976389d16 59 v |= _pin[i]->read() << i;
mega64 146:03e976389d16 60 }
mega64 146:03e976389d16 61 }
mega64 146:03e976389d16 62 unlock();
mega64 146:03e976389d16 63 return v;
mega64 146:03e976389d16 64 }
mega64 146:03e976389d16 65
mega64 146:03e976389d16 66 void BusIn::mode(PinMode pull) {
mega64 146:03e976389d16 67 lock();
mega64 146:03e976389d16 68 for (int i=0; i<16; i++) {
mega64 146:03e976389d16 69 if (_pin[i] != 0) {
mega64 146:03e976389d16 70 _pin[i]->mode(pull);
mega64 146:03e976389d16 71 }
mega64 146:03e976389d16 72 }
mega64 146:03e976389d16 73 unlock();
mega64 146:03e976389d16 74 }
mega64 146:03e976389d16 75
mega64 146:03e976389d16 76 void BusIn::lock() {
mega64 146:03e976389d16 77 _mutex.lock();
mega64 146:03e976389d16 78 }
mega64 146:03e976389d16 79
mega64 146:03e976389d16 80 void BusIn::unlock() {
mega64 146:03e976389d16 81 _mutex.unlock();
mega64 146:03e976389d16 82 }
mega64 146:03e976389d16 83
mega64 146:03e976389d16 84 BusIn::operator int() {
mega64 146:03e976389d16 85 // Underlying read is thread safe
mega64 146:03e976389d16 86 return read();
mega64 146:03e976389d16 87 }
mega64 146:03e976389d16 88
mega64 146:03e976389d16 89 DigitalIn& BusIn::operator[] (int index) {
mega64 146:03e976389d16 90 // No lock needed since _pin is not modified outside the constructor
mega64 146:03e976389d16 91 MBED_ASSERT(index >= 0 && index <= 16);
mega64 146:03e976389d16 92 MBED_ASSERT(_pin[index]);
mega64 146:03e976389d16 93 return *_pin[index];
mega64 146:03e976389d16 94 }
mega64 146:03e976389d16 95
mega64 146:03e976389d16 96 } // namespace mbed