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_interface.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 #include <stdio.h>
mega64 146:03e976389d16 17 #include "platform/mbed_interface.h"
mega64 146:03e976389d16 18
mega64 146:03e976389d16 19 #include "hal/gpio_api.h"
mega64 146:03e976389d16 20 #include "platform/mbed_wait_api.h"
mega64 146:03e976389d16 21 #include "platform/mbed_semihost_api.h"
mega64 146:03e976389d16 22 #include "platform/mbed_error.h"
mega64 146:03e976389d16 23 #include "platform/mbed_toolchain.h"
mega64 146:03e976389d16 24
mega64 146:03e976389d16 25 #if DEVICE_SEMIHOST
mega64 146:03e976389d16 26
mega64 146:03e976389d16 27 // return true if a debugger is attached, indicating mbed interface is connected
mega64 146:03e976389d16 28 int mbed_interface_connected(void) {
mega64 146:03e976389d16 29 return semihost_connected();
mega64 146:03e976389d16 30 }
mega64 146:03e976389d16 31
mega64 146:03e976389d16 32 int mbed_interface_reset(void) {
mega64 146:03e976389d16 33 if (mbed_interface_connected()) {
mega64 146:03e976389d16 34 semihost_reset();
mega64 146:03e976389d16 35 return 0;
mega64 146:03e976389d16 36 } else {
mega64 146:03e976389d16 37 return -1;
mega64 146:03e976389d16 38 }
mega64 146:03e976389d16 39 }
mega64 146:03e976389d16 40
mega64 146:03e976389d16 41 WEAK int mbed_interface_uid(char *uid) {
mega64 146:03e976389d16 42 if (mbed_interface_connected()) {
mega64 146:03e976389d16 43 return semihost_uid(uid); // Returns 0 if successful, -1 on failure
mega64 146:03e976389d16 44 } else {
mega64 146:03e976389d16 45 uid[0] = 0;
mega64 146:03e976389d16 46 return -1;
mega64 146:03e976389d16 47 }
mega64 146:03e976389d16 48 }
mega64 146:03e976389d16 49
mega64 146:03e976389d16 50 int mbed_interface_disconnect(void) {
mega64 146:03e976389d16 51 int res;
mega64 146:03e976389d16 52 if (mbed_interface_connected()) {
mega64 146:03e976389d16 53 if ((res = semihost_disabledebug()) != 0)
mega64 146:03e976389d16 54 return res;
mega64 146:03e976389d16 55 while (mbed_interface_connected());
mega64 146:03e976389d16 56 return 0;
mega64 146:03e976389d16 57 } else {
mega64 146:03e976389d16 58 return -1;
mega64 146:03e976389d16 59 }
mega64 146:03e976389d16 60 }
mega64 146:03e976389d16 61
mega64 146:03e976389d16 62 int mbed_interface_powerdown(void) {
mega64 146:03e976389d16 63 int res;
mega64 146:03e976389d16 64 if (mbed_interface_connected()) {
mega64 146:03e976389d16 65 if ((res = semihost_powerdown()) != 0)
mega64 146:03e976389d16 66 return res;
mega64 146:03e976389d16 67 while (mbed_interface_connected());
mega64 146:03e976389d16 68 return 0;
mega64 146:03e976389d16 69 } else {
mega64 146:03e976389d16 70 return -1;
mega64 146:03e976389d16 71 }
mega64 146:03e976389d16 72 }
mega64 146:03e976389d16 73
mega64 146:03e976389d16 74 // for backward compatibility
mega64 146:03e976389d16 75 void mbed_reset(void) {
mega64 146:03e976389d16 76 mbed_interface_reset();
mega64 146:03e976389d16 77 }
mega64 146:03e976389d16 78
mega64 146:03e976389d16 79 WEAK int mbed_uid(char *uid) {
mega64 146:03e976389d16 80 return mbed_interface_uid(uid);
mega64 146:03e976389d16 81 }
mega64 146:03e976389d16 82 #endif
mega64 146:03e976389d16 83
mega64 146:03e976389d16 84 WEAK void mbed_mac_address(char *mac) {
mega64 146:03e976389d16 85 #if DEVICE_SEMIHOST
mega64 146:03e976389d16 86 char uid[DEVICE_ID_LENGTH + 1];
mega64 146:03e976389d16 87 int i;
mega64 146:03e976389d16 88
mega64 146:03e976389d16 89 // if we have a UID, extract the MAC
mega64 146:03e976389d16 90 if (mbed_interface_uid(uid) == 0) {
mega64 146:03e976389d16 91 char *p = uid;
mega64 146:03e976389d16 92 #if defined(DEVICE_MAC_OFFSET)
mega64 146:03e976389d16 93 p += DEVICE_MAC_OFFSET;
mega64 146:03e976389d16 94 #endif
mega64 146:03e976389d16 95 for (i=0; i<6; i++) {
mega64 146:03e976389d16 96 int byte;
mega64 146:03e976389d16 97 sscanf(p, "%2x", &byte);
mega64 146:03e976389d16 98 mac[i] = byte;
mega64 146:03e976389d16 99 p += 2;
mega64 146:03e976389d16 100 }
mega64 146:03e976389d16 101 mac[0] &= ~0x01; // reset the IG bit in the address; see IEE 802.3-2002, Section 3.2.3(b)
mega64 146:03e976389d16 102 } else { // else return a default MAC
mega64 146:03e976389d16 103 #endif
mega64 146:03e976389d16 104 mac[0] = 0x00;
mega64 146:03e976389d16 105 mac[1] = 0x02;
mega64 146:03e976389d16 106 mac[2] = 0xF7;
mega64 146:03e976389d16 107 mac[3] = 0xF0;
mega64 146:03e976389d16 108 mac[4] = 0x00;
mega64 146:03e976389d16 109 mac[5] = 0x00;
mega64 146:03e976389d16 110 #if DEVICE_SEMIHOST
mega64 146:03e976389d16 111 }
mega64 146:03e976389d16 112 #endif
mega64 146:03e976389d16 113 }