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_application.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) 2017-2017 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 #include <stdlib.h>
mega64 146:03e976389d16 18 #include <stdarg.h>
mega64 146:03e976389d16 19 #include "device.h"
mega64 146:03e976389d16 20 #include "platform/mbed_application.h"
mega64 146:03e976389d16 21
mega64 146:03e976389d16 22 #if MBED_APPLICATION_SUPPORT
mega64 146:03e976389d16 23
mega64 146:03e976389d16 24 static void powerdown_nvic(void);
mega64 146:03e976389d16 25 static void powerdown_scb(uint32_t vtor);
mega64 146:03e976389d16 26 static void start_new_application(void *sp, void *pc);
mega64 146:03e976389d16 27
mega64 146:03e976389d16 28 void mbed_start_application(uintptr_t address)
mega64 146:03e976389d16 29 {
mega64 146:03e976389d16 30 void *sp;
mega64 146:03e976389d16 31 void *pc;
mega64 146:03e976389d16 32
mega64 146:03e976389d16 33 // Interrupts are re-enabled in start_new_application
mega64 146:03e976389d16 34 __disable_irq();
mega64 146:03e976389d16 35
mega64 146:03e976389d16 36 SysTick->CTRL = 0x00000000;
mega64 146:03e976389d16 37 powerdown_nvic();
mega64 146:03e976389d16 38 powerdown_scb(address);
mega64 146:03e976389d16 39
mega64 146:03e976389d16 40 sp = *((void**)address + 0);
mega64 146:03e976389d16 41 pc = *((void**)address + 1);
mega64 146:03e976389d16 42 start_new_application(sp, pc);
mega64 146:03e976389d16 43 }
mega64 146:03e976389d16 44
mega64 146:03e976389d16 45 static void powerdown_nvic()
mega64 146:03e976389d16 46 {
mega64 146:03e976389d16 47 int isr_count;
mega64 146:03e976389d16 48 int i;
mega64 146:03e976389d16 49 int j;
mega64 146:03e976389d16 50
mega64 146:03e976389d16 51 isr_count = (SCnSCB->ICTR & SCnSCB_ICTR_INTLINESNUM_Msk) >> SCnSCB_ICTR_INTLINESNUM_Pos;
mega64 146:03e976389d16 52 for (i = 0; i < isr_count; i++) {
mega64 146:03e976389d16 53 NVIC->ICER[i] = 0xFFFFFFFF;
mega64 146:03e976389d16 54 NVIC->ICPR[i] = 0xFFFFFFFF;
mega64 146:03e976389d16 55 for (j = 0; j < 8; j++) {
mega64 146:03e976389d16 56 NVIC->IP[i * 8 + j] = 0x00000000;
mega64 146:03e976389d16 57 }
mega64 146:03e976389d16 58 }
mega64 146:03e976389d16 59 }
mega64 146:03e976389d16 60
mega64 146:03e976389d16 61 static void powerdown_scb(uint32_t vtor)
mega64 146:03e976389d16 62 {
mega64 146:03e976389d16 63 int i;
mega64 146:03e976389d16 64
mega64 146:03e976389d16 65 // SCB->CPUID - Read only CPU ID register
mega64 146:03e976389d16 66 SCB->ICSR = SCB_ICSR_PENDSVCLR_Msk | SCB_ICSR_PENDSTCLR_Msk;
mega64 146:03e976389d16 67 SCB->VTOR = vtor;
mega64 146:03e976389d16 68 SCB->AIRCR = 0x05FA | 0x0000;
mega64 146:03e976389d16 69 SCB->SCR = 0x00000000;
mega64 146:03e976389d16 70 // SCB->CCR - Implementation defined value
mega64 146:03e976389d16 71 for (i = 0; i < 12; i++) {
mega64 146:03e976389d16 72 #if defined(__CORTEX_M7)
mega64 146:03e976389d16 73 SCB->SHPR[i] = 0x00;
mega64 146:03e976389d16 74 #else
mega64 146:03e976389d16 75 SCB->SHP[i] = 0x00;
mega64 146:03e976389d16 76 #endif
mega64 146:03e976389d16 77 }
mega64 146:03e976389d16 78 SCB->SHCSR = 0x00000000;
mega64 146:03e976389d16 79 SCB->CFSR = 0xFFFFFFFF;
mega64 146:03e976389d16 80 SCB->HFSR = SCB_HFSR_DEBUGEVT_Msk | SCB_HFSR_FORCED_Msk | SCB_HFSR_VECTTBL_Msk;
mega64 146:03e976389d16 81 SCB->DFSR = SCB_DFSR_EXTERNAL_Msk | SCB_DFSR_VCATCH_Msk |
mega64 146:03e976389d16 82 SCB_DFSR_DWTTRAP_Msk | SCB_DFSR_BKPT_Msk | SCB_DFSR_HALTED_Msk;
mega64 146:03e976389d16 83 // SCB->MMFAR - Implementation defined value
mega64 146:03e976389d16 84 // SCB->BFAR - Implementation defined value
mega64 146:03e976389d16 85 // SCB->AFSR - Implementation defined value
mega64 146:03e976389d16 86 // SCB->PFR - Read only processor feature register
mega64 146:03e976389d16 87 // SCB->DFR - Read only debug feature registers
mega64 146:03e976389d16 88 // SCB->ADR - Read only auxiliary feature registers
mega64 146:03e976389d16 89 // SCB->MMFR - Read only memory model feature registers
mega64 146:03e976389d16 90 // SCB->ISAR - Read only instruction set attribute registers
mega64 146:03e976389d16 91 // SCB->CPACR - Implementation defined value
mega64 146:03e976389d16 92 }
mega64 146:03e976389d16 93
mega64 146:03e976389d16 94 #if defined (__CC_ARM)
mega64 146:03e976389d16 95
mega64 146:03e976389d16 96 __asm static void start_new_application(void *sp, void *pc)
mega64 146:03e976389d16 97 {
mega64 146:03e976389d16 98 MOV R2, #0
mega64 146:03e976389d16 99 MSR CONTROL, R2 // Switch to main stack
mega64 146:03e976389d16 100 MOV SP, R0
mega64 146:03e976389d16 101 MSR PRIMASK, R2 // Enable interrupts
mega64 146:03e976389d16 102 BX R1
mega64 146:03e976389d16 103 }
mega64 146:03e976389d16 104
mega64 146:03e976389d16 105 #elif defined (__GNUC__) || defined (__ICCARM__)
mega64 146:03e976389d16 106
mega64 146:03e976389d16 107 void start_new_application(void *sp, void *pc)
mega64 146:03e976389d16 108 {
mega64 146:03e976389d16 109 __asm volatile (
mega64 146:03e976389d16 110 "mov r2, #0 \n"
mega64 146:03e976389d16 111 "msr control, r2 \n" // Switch to main stack
mega64 146:03e976389d16 112 "mov sp, %0 \n"
mega64 146:03e976389d16 113 "msr primask, r2 \n" // Enable interrupts
mega64 146:03e976389d16 114 "bx %1 \n"
mega64 146:03e976389d16 115 :
mega64 146:03e976389d16 116 : "l" (sp), "l" (pc)
mega64 146:03e976389d16 117 : "r2", "cc", "memory"
mega64 146:03e976389d16 118 );
mega64 146:03e976389d16 119 }
mega64 146:03e976389d16 120
mega64 146:03e976389d16 121 #else
mega64 146:03e976389d16 122
mega64 146:03e976389d16 123 #error "Unsupported toolchain"
mega64 146:03e976389d16 124
mega64 146:03e976389d16 125 #endif
mega64 146:03e976389d16 126
mega64 146:03e976389d16 127 #endif /* MBED_APPLICATION_SUPPORT */