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_rtc_time.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 "hal/rtc_api.h"
mega64 146:03e976389d16 17
mega64 146:03e976389d16 18 #include <time.h>
mega64 146:03e976389d16 19 #include "platform/mbed_critical.h"
mega64 146:03e976389d16 20 #include "platform/mbed_rtc_time.h"
mega64 146:03e976389d16 21 #include "hal/us_ticker_api.h"
mega64 146:03e976389d16 22 #include "platform/SingletonPtr.h"
mega64 146:03e976389d16 23 #include "platform/PlatformMutex.h"
mega64 146:03e976389d16 24
mega64 146:03e976389d16 25 static SingletonPtr<PlatformMutex> _mutex;
mega64 146:03e976389d16 26
mega64 146:03e976389d16 27 #if DEVICE_RTC
mega64 146:03e976389d16 28 static void (*_rtc_init)(void) = rtc_init;
mega64 146:03e976389d16 29 static int (*_rtc_isenabled)(void) = rtc_isenabled;
mega64 146:03e976389d16 30 static time_t (*_rtc_read)(void) = rtc_read;
mega64 146:03e976389d16 31 static void (*_rtc_write)(time_t t) = rtc_write;
mega64 146:03e976389d16 32 #else
mega64 146:03e976389d16 33 static void (*_rtc_init)(void) = NULL;
mega64 146:03e976389d16 34 static int (*_rtc_isenabled)(void) = NULL;
mega64 146:03e976389d16 35 static time_t (*_rtc_read)(void) = NULL;
mega64 146:03e976389d16 36 static void (*_rtc_write)(time_t t) = NULL;
mega64 146:03e976389d16 37 #endif
mega64 146:03e976389d16 38
mega64 146:03e976389d16 39 #ifdef __cplusplus
mega64 146:03e976389d16 40 extern "C" {
mega64 146:03e976389d16 41 #endif
mega64 146:03e976389d16 42 #if defined (__ICCARM__)
mega64 146:03e976389d16 43 time_t __time32(time_t *timer)
mega64 146:03e976389d16 44 #else
mega64 146:03e976389d16 45 time_t time(time_t *timer)
mega64 146:03e976389d16 46 #endif
mega64 146:03e976389d16 47
mega64 146:03e976389d16 48 {
mega64 146:03e976389d16 49 _mutex->lock();
mega64 146:03e976389d16 50 if (_rtc_isenabled != NULL) {
mega64 146:03e976389d16 51 if (!(_rtc_isenabled())) {
mega64 146:03e976389d16 52 set_time(0);
mega64 146:03e976389d16 53 }
mega64 146:03e976389d16 54 }
mega64 146:03e976389d16 55
mega64 146:03e976389d16 56 time_t t = 0;
mega64 146:03e976389d16 57 if (_rtc_read != NULL) {
mega64 146:03e976389d16 58 t = _rtc_read();
mega64 146:03e976389d16 59 }
mega64 146:03e976389d16 60
mega64 146:03e976389d16 61 if (timer != NULL) {
mega64 146:03e976389d16 62 *timer = t;
mega64 146:03e976389d16 63 }
mega64 146:03e976389d16 64 _mutex->unlock();
mega64 146:03e976389d16 65 return t;
mega64 146:03e976389d16 66 }
mega64 146:03e976389d16 67
mega64 146:03e976389d16 68 void set_time(time_t t) {
mega64 146:03e976389d16 69 _mutex->lock();
mega64 146:03e976389d16 70 if (_rtc_init != NULL) {
mega64 146:03e976389d16 71 _rtc_init();
mega64 146:03e976389d16 72 }
mega64 146:03e976389d16 73 if (_rtc_write != NULL) {
mega64 146:03e976389d16 74 _rtc_write(t);
mega64 146:03e976389d16 75 }
mega64 146:03e976389d16 76 _mutex->unlock();
mega64 146:03e976389d16 77 }
mega64 146:03e976389d16 78
mega64 146:03e976389d16 79 clock_t clock() {
mega64 146:03e976389d16 80 _mutex->lock();
mega64 146:03e976389d16 81 clock_t t = us_ticker_read();
mega64 146:03e976389d16 82 t /= 1000000 / CLOCKS_PER_SEC; // convert to processor time
mega64 146:03e976389d16 83 _mutex->unlock();
mega64 146:03e976389d16 84 return t;
mega64 146:03e976389d16 85 }
mega64 146:03e976389d16 86
mega64 146:03e976389d16 87 void attach_rtc(time_t (*read_rtc)(void), void (*write_rtc)(time_t), void (*init_rtc)(void), int (*isenabled_rtc)(void)) {
mega64 146:03e976389d16 88 _mutex->lock();
mega64 146:03e976389d16 89 _rtc_read = read_rtc;
mega64 146:03e976389d16 90 _rtc_write = write_rtc;
mega64 146:03e976389d16 91 _rtc_init = init_rtc;
mega64 146:03e976389d16 92 _rtc_isenabled = isenabled_rtc;
mega64 146:03e976389d16 93 _mutex->unlock();
mega64 146:03e976389d16 94 }
mega64 146:03e976389d16 95
mega64 146:03e976389d16 96
mega64 146:03e976389d16 97
mega64 146:03e976389d16 98 #ifdef __cplusplus
mega64 146:03e976389d16 99 }
mega64 146:03e976389d16 100 #endif