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_lib.json@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 {
mega64 146:03e976389d16 2 "name": "platform",
mega64 146:03e976389d16 3 "config": {
mega64 146:03e976389d16 4 "stdio-convert-newlines": {
mega64 146:03e976389d16 5 "help": "Enable conversion to standard newlines on stdin/stdout",
mega64 146:03e976389d16 6 "value": false
mega64 146:03e976389d16 7 },
mega64 146:03e976389d16 8
mega64 146:03e976389d16 9 "stdio-baud-rate": {
mega64 146:03e976389d16 10 "help": "Baud rate for stdio",
mega64 146:03e976389d16 11 "value": 9600
mega64 146:03e976389d16 12 },
mega64 146:03e976389d16 13
mega64 146:03e976389d16 14 "stdio-flush-at-exit": {
mega64 146:03e976389d16 15 "help": "Enable or disable the flush of standard I/O's at exit.",
mega64 146:03e976389d16 16 "value": true
mega64 146:03e976389d16 17 },
mega64 146:03e976389d16 18
mega64 146:03e976389d16 19 "default-serial-baud-rate": {
mega64 146:03e976389d16 20 "help": "Default baud rate for a Serial or RawSerial instance (if not specified in the constructor)",
mega64 146:03e976389d16 21 "value": 9600
mega64 146:03e976389d16 22 }
mega64 146:03e976389d16 23 },
mega64 146:03e976389d16 24 "target_overrides": {
mega64 146:03e976389d16 25 "EFM32": {
mega64 146:03e976389d16 26 "stdio-baud-rate": 115200
mega64 146:03e976389d16 27 },
mega64 146:03e976389d16 28 "EFR32": {
mega64 146:03e976389d16 29 "stdio-baud-rate": 115200
mega64 146:03e976389d16 30 }
mega64 146:03e976389d16 31 }
mega64 146:03e976389d16 32 }