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/InterruptIn.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/InterruptIn.h"
mega64 146:03e976389d16 17
mega64 146:03e976389d16 18 #if DEVICE_INTERRUPTIN
mega64 146:03e976389d16 19
mega64 146:03e976389d16 20 namespace mbed {
mega64 146:03e976389d16 21
mega64 146:03e976389d16 22 static void donothing() {}
mega64 146:03e976389d16 23
mega64 146:03e976389d16 24 InterruptIn::InterruptIn(PinName pin) : gpio(),
mega64 146:03e976389d16 25 gpio_irq(),
mega64 146:03e976389d16 26 _rise(),
mega64 146:03e976389d16 27 _fall() {
mega64 146:03e976389d16 28 // No lock needed in the constructor
mega64 146:03e976389d16 29
mega64 146:03e976389d16 30 _rise = donothing;
mega64 146:03e976389d16 31 _fall = donothing;
mega64 146:03e976389d16 32
mega64 146:03e976389d16 33 gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
mega64 146:03e976389d16 34 gpio_init_in(&gpio, pin);
mega64 146:03e976389d16 35 }
mega64 146:03e976389d16 36
mega64 146:03e976389d16 37 InterruptIn::~InterruptIn() {
mega64 146:03e976389d16 38 // No lock needed in the destructor
mega64 146:03e976389d16 39 gpio_irq_free(&gpio_irq);
mega64 146:03e976389d16 40 }
mega64 146:03e976389d16 41
mega64 146:03e976389d16 42 int InterruptIn::read() {
mega64 146:03e976389d16 43 // Read only
mega64 146:03e976389d16 44 return gpio_read(&gpio);
mega64 146:03e976389d16 45 }
mega64 146:03e976389d16 46
mega64 146:03e976389d16 47 void InterruptIn::mode(PinMode pull) {
mega64 146:03e976389d16 48 core_util_critical_section_enter();
mega64 146:03e976389d16 49 gpio_mode(&gpio, pull);
mega64 146:03e976389d16 50 core_util_critical_section_exit();
mega64 146:03e976389d16 51 }
mega64 146:03e976389d16 52
mega64 146:03e976389d16 53 void InterruptIn::rise(Callback<void()> func) {
mega64 146:03e976389d16 54 core_util_critical_section_enter();
mega64 146:03e976389d16 55 if (func) {
mega64 146:03e976389d16 56 _rise = func;
mega64 146:03e976389d16 57 gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
mega64 146:03e976389d16 58 } else {
mega64 146:03e976389d16 59 _rise = donothing;
mega64 146:03e976389d16 60 gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
mega64 146:03e976389d16 61 }
mega64 146:03e976389d16 62 core_util_critical_section_exit();
mega64 146:03e976389d16 63 }
mega64 146:03e976389d16 64
mega64 146:03e976389d16 65 void InterruptIn::fall(Callback<void()> func) {
mega64 146:03e976389d16 66 core_util_critical_section_enter();
mega64 146:03e976389d16 67 if (func) {
mega64 146:03e976389d16 68 _fall = func;
mega64 146:03e976389d16 69 gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
mega64 146:03e976389d16 70 } else {
mega64 146:03e976389d16 71 _fall = donothing;
mega64 146:03e976389d16 72 gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
mega64 146:03e976389d16 73 }
mega64 146:03e976389d16 74 core_util_critical_section_exit();
mega64 146:03e976389d16 75 }
mega64 146:03e976389d16 76
mega64 146:03e976389d16 77 void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event) {
mega64 146:03e976389d16 78 InterruptIn *handler = (InterruptIn*)id;
mega64 146:03e976389d16 79 switch (event) {
mega64 146:03e976389d16 80 case IRQ_RISE: handler->_rise(); break;
mega64 146:03e976389d16 81 case IRQ_FALL: handler->_fall(); break;
mega64 146:03e976389d16 82 case IRQ_NONE: break;
mega64 146:03e976389d16 83 }
mega64 146:03e976389d16 84 }
mega64 146:03e976389d16 85
mega64 146:03e976389d16 86 void InterruptIn::enable_irq() {
mega64 146:03e976389d16 87 core_util_critical_section_enter();
mega64 146:03e976389d16 88 gpio_irq_enable(&gpio_irq);
mega64 146:03e976389d16 89 core_util_critical_section_exit();
mega64 146:03e976389d16 90 }
mega64 146:03e976389d16 91
mega64 146:03e976389d16 92 void InterruptIn::disable_irq() {
mega64 146:03e976389d16 93 core_util_critical_section_enter();
mega64 146:03e976389d16 94 gpio_irq_disable(&gpio_irq);
mega64 146:03e976389d16 95 core_util_critical_section_exit();
mega64 146:03e976389d16 96 }
mega64 146:03e976389d16 97
mega64 146:03e976389d16 98 InterruptIn::operator int() {
mega64 146:03e976389d16 99 // Underlying call is atomic
mega64 146:03e976389d16 100 return read();
mega64 146:03e976389d16 101 }
mega64 146:03e976389d16 102
mega64 146:03e976389d16 103 } // namespace mbed
mega64 146:03e976389d16 104
mega64 146:03e976389d16 105 #endif