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_wait_api_no_rtos.c@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
mega64 146:03e976389d16 17 // This implementation of the wait functions will be compiled only
mega64 146:03e976389d16 18 // if the RTOS is not present.
mega64 146:03e976389d16 19 #ifndef MBED_CONF_RTOS_PRESENT
mega64 146:03e976389d16 20
mega64 146:03e976389d16 21 #include "platform/mbed_wait_api.h"
mega64 146:03e976389d16 22 #include "hal/us_ticker_api.h"
mega64 146:03e976389d16 23
mega64 146:03e976389d16 24 void wait(float s) {
mega64 146:03e976389d16 25 wait_us(s * 1000000.0f);
mega64 146:03e976389d16 26 }
mega64 146:03e976389d16 27
mega64 146:03e976389d16 28 void wait_ms(int ms) {
mega64 146:03e976389d16 29 wait_us(ms * 1000);
mega64 146:03e976389d16 30 }
mega64 146:03e976389d16 31
mega64 146:03e976389d16 32 void wait_us(int us) {
mega64 146:03e976389d16 33 uint32_t start = us_ticker_read();
mega64 146:03e976389d16 34 while ((us_ticker_read() - start) < (uint32_t)us);
mega64 146:03e976389d16 35 }
mega64 146:03e976389d16 36
mega64 146:03e976389d16 37 #endif // #ifndef MBED_CONF_RTOS_PRESENT
mega64 146:03e976389d16 38