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_critical.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 /*
mega64 146:03e976389d16 2 * Copyright (c) 2015-2016, ARM Limited, All Rights Reserved
mega64 146:03e976389d16 3 * SPDX-License-Identifier: Apache-2.0
mega64 146:03e976389d16 4 *
mega64 146:03e976389d16 5 * Licensed under the Apache License, Version 2.0 (the "License"); you may
mega64 146:03e976389d16 6 * not use this file except in compliance with the License.
mega64 146:03e976389d16 7 * You may obtain a copy of the License at
mega64 146:03e976389d16 8 *
mega64 146:03e976389d16 9 * http://www.apache.org/licenses/LICENSE-2.0
mega64 146:03e976389d16 10 *
mega64 146:03e976389d16 11 * Unless required by applicable law or agreed to in writing, software
mega64 146:03e976389d16 12 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
mega64 146:03e976389d16 13 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mega64 146:03e976389d16 14 * See the License for the specific language governing permissions and
mega64 146:03e976389d16 15 * limitations under the License.
mega64 146:03e976389d16 16 */
mega64 146:03e976389d16 17
mega64 146:03e976389d16 18 /* Declare __STDC_LIMIT_MACROS so stdint.h defines UINT32_MAX when using C++ */
mega64 146:03e976389d16 19 #define __STDC_LIMIT_MACROS
mega64 146:03e976389d16 20 #include "platform/mbed_critical.h"
mega64 146:03e976389d16 21
mega64 146:03e976389d16 22 #include "cmsis.h"
mega64 146:03e976389d16 23 #include "platform/mbed_assert.h"
mega64 146:03e976389d16 24 #include "platform/mbed_toolchain.h"
mega64 146:03e976389d16 25
mega64 146:03e976389d16 26 #define EXCLUSIVE_ACCESS (!defined (__CORTEX_M0) && !defined (__CORTEX_M0PLUS))
mega64 146:03e976389d16 27
mega64 146:03e976389d16 28 static volatile uint32_t interrupt_enable_counter = 0;
mega64 146:03e976389d16 29 static volatile bool critical_interrupts_disabled = false;
mega64 146:03e976389d16 30
mega64 146:03e976389d16 31 bool core_util_are_interrupts_enabled(void)
mega64 146:03e976389d16 32 {
mega64 146:03e976389d16 33 #if defined(__CORTEX_A9)
mega64 146:03e976389d16 34 return ((__get_CPSR() & 0x80) == 0);
mega64 146:03e976389d16 35 #else
mega64 146:03e976389d16 36 return ((__get_PRIMASK() & 0x1) == 0);
mega64 146:03e976389d16 37 #endif
mega64 146:03e976389d16 38 }
mega64 146:03e976389d16 39
mega64 146:03e976389d16 40 MBED_WEAK void core_util_critical_section_enter(void)
mega64 146:03e976389d16 41 {
mega64 146:03e976389d16 42 bool interrupts_disabled = !core_util_are_interrupts_enabled();
mega64 146:03e976389d16 43 __disable_irq();
mega64 146:03e976389d16 44
mega64 146:03e976389d16 45 /* Save the interrupt disabled state as it was prior to any nested critical section lock use */
mega64 146:03e976389d16 46 if (!interrupt_enable_counter) {
mega64 146:03e976389d16 47 critical_interrupts_disabled = interrupts_disabled;
mega64 146:03e976389d16 48 }
mega64 146:03e976389d16 49
mega64 146:03e976389d16 50 /* If the interrupt_enable_counter overflows or we are in a nested critical section and interrupts
mega64 146:03e976389d16 51 are enabled, then something has gone badly wrong thus assert an error.
mega64 146:03e976389d16 52 */
mega64 146:03e976389d16 53 MBED_ASSERT(interrupt_enable_counter < UINT32_MAX);
mega64 146:03e976389d16 54 // FIXME
mega64 146:03e976389d16 55 #ifndef FEATURE_UVISOR
mega64 146:03e976389d16 56 if (interrupt_enable_counter > 0) {
mega64 146:03e976389d16 57 MBED_ASSERT(interrupts_disabled);
mega64 146:03e976389d16 58 }
mega64 146:03e976389d16 59 #else
mega64 146:03e976389d16 60 #warning "core_util_critical_section_enter needs fixing to work from unprivileged code"
mega64 146:03e976389d16 61 #endif /* FEATURE_UVISOR */
mega64 146:03e976389d16 62 interrupt_enable_counter++;
mega64 146:03e976389d16 63 }
mega64 146:03e976389d16 64
mega64 146:03e976389d16 65 MBED_WEAK void core_util_critical_section_exit(void)
mega64 146:03e976389d16 66 {
mega64 146:03e976389d16 67 /* If critical_section_enter has not previously been called, do nothing */
mega64 146:03e976389d16 68 if (interrupt_enable_counter) {
mega64 146:03e976389d16 69
mega64 146:03e976389d16 70 // FIXME
mega64 146:03e976389d16 71 #ifndef FEATURE_UVISOR
mega64 146:03e976389d16 72 bool interrupts_disabled = !core_util_are_interrupts_enabled(); /* get the current interrupt disabled state */
mega64 146:03e976389d16 73
mega64 146:03e976389d16 74 MBED_ASSERT(interrupts_disabled); /* Interrupts must be disabled on invoking an exit from a critical section */
mega64 146:03e976389d16 75 #else
mega64 146:03e976389d16 76 #warning "core_util_critical_section_exit needs fixing to work from unprivileged code"
mega64 146:03e976389d16 77 #endif /* FEATURE_UVISOR */
mega64 146:03e976389d16 78
mega64 146:03e976389d16 79 interrupt_enable_counter--;
mega64 146:03e976389d16 80
mega64 146:03e976389d16 81 /* Only re-enable interrupts if we are exiting the last of the nested critical sections and
mega64 146:03e976389d16 82 interrupts were enabled on entry to the first critical section.
mega64 146:03e976389d16 83 */
mega64 146:03e976389d16 84 if (!interrupt_enable_counter && !critical_interrupts_disabled) {
mega64 146:03e976389d16 85 __enable_irq();
mega64 146:03e976389d16 86 }
mega64 146:03e976389d16 87 }
mega64 146:03e976389d16 88 }
mega64 146:03e976389d16 89
mega64 146:03e976389d16 90 #if EXCLUSIVE_ACCESS
mega64 146:03e976389d16 91
mega64 146:03e976389d16 92 /* Supress __ldrex and __strex deprecated warnings - "#3731-D: intrinsic is deprecated" */
mega64 146:03e976389d16 93 #if defined (__CC_ARM)
mega64 146:03e976389d16 94 #pragma diag_suppress 3731
mega64 146:03e976389d16 95 #endif
mega64 146:03e976389d16 96
mega64 146:03e976389d16 97 bool core_util_atomic_cas_u8(uint8_t *ptr, uint8_t *expectedCurrentValue, uint8_t desiredValue)
mega64 146:03e976389d16 98 {
mega64 146:03e976389d16 99 uint8_t currentValue = __LDREXB((volatile uint8_t*)ptr);
mega64 146:03e976389d16 100 if (currentValue != *expectedCurrentValue) {
mega64 146:03e976389d16 101 *expectedCurrentValue = currentValue;
mega64 146:03e976389d16 102 __CLREX();
mega64 146:03e976389d16 103 return false;
mega64 146:03e976389d16 104 }
mega64 146:03e976389d16 105
mega64 146:03e976389d16 106 return !__STREXB(desiredValue, (volatile uint8_t*)ptr);
mega64 146:03e976389d16 107 }
mega64 146:03e976389d16 108
mega64 146:03e976389d16 109 bool core_util_atomic_cas_u16(uint16_t *ptr, uint16_t *expectedCurrentValue, uint16_t desiredValue)
mega64 146:03e976389d16 110 {
mega64 146:03e976389d16 111 uint16_t currentValue = __LDREXH((volatile uint16_t*)ptr);
mega64 146:03e976389d16 112 if (currentValue != *expectedCurrentValue) {
mega64 146:03e976389d16 113 *expectedCurrentValue = currentValue;
mega64 146:03e976389d16 114 __CLREX();
mega64 146:03e976389d16 115 return false;
mega64 146:03e976389d16 116 }
mega64 146:03e976389d16 117
mega64 146:03e976389d16 118 return !__STREXH(desiredValue, (volatile uint16_t*)ptr);
mega64 146:03e976389d16 119 }
mega64 146:03e976389d16 120
mega64 146:03e976389d16 121
mega64 146:03e976389d16 122 bool core_util_atomic_cas_u32(uint32_t *ptr, uint32_t *expectedCurrentValue, uint32_t desiredValue)
mega64 146:03e976389d16 123 {
mega64 146:03e976389d16 124 uint32_t currentValue = __LDREXW((volatile uint32_t*)ptr);
mega64 146:03e976389d16 125 if (currentValue != *expectedCurrentValue) {
mega64 146:03e976389d16 126 *expectedCurrentValue = currentValue;
mega64 146:03e976389d16 127 __CLREX();
mega64 146:03e976389d16 128 return false;
mega64 146:03e976389d16 129 }
mega64 146:03e976389d16 130
mega64 146:03e976389d16 131 return !__STREXW(desiredValue, (volatile uint32_t*)ptr);
mega64 146:03e976389d16 132 }
mega64 146:03e976389d16 133
mega64 146:03e976389d16 134 uint8_t core_util_atomic_incr_u8(uint8_t *valuePtr, uint8_t delta)
mega64 146:03e976389d16 135 {
mega64 146:03e976389d16 136 uint8_t newValue;
mega64 146:03e976389d16 137 do {
mega64 146:03e976389d16 138 newValue = __LDREXB((volatile uint8_t*)valuePtr) + delta;
mega64 146:03e976389d16 139 } while (__STREXB(newValue, (volatile uint8_t*)valuePtr));
mega64 146:03e976389d16 140 return newValue;
mega64 146:03e976389d16 141 }
mega64 146:03e976389d16 142
mega64 146:03e976389d16 143 uint16_t core_util_atomic_incr_u16(uint16_t *valuePtr, uint16_t delta)
mega64 146:03e976389d16 144 {
mega64 146:03e976389d16 145 uint16_t newValue;
mega64 146:03e976389d16 146 do {
mega64 146:03e976389d16 147 newValue = __LDREXH((volatile uint16_t*)valuePtr) + delta;
mega64 146:03e976389d16 148 } while (__STREXH(newValue, (volatile uint16_t*)valuePtr));
mega64 146:03e976389d16 149 return newValue;
mega64 146:03e976389d16 150 }
mega64 146:03e976389d16 151
mega64 146:03e976389d16 152 uint32_t core_util_atomic_incr_u32(uint32_t *valuePtr, uint32_t delta)
mega64 146:03e976389d16 153 {
mega64 146:03e976389d16 154 uint32_t newValue;
mega64 146:03e976389d16 155 do {
mega64 146:03e976389d16 156 newValue = __LDREXW((volatile uint32_t*)valuePtr) + delta;
mega64 146:03e976389d16 157 } while (__STREXW(newValue, (volatile uint32_t*)valuePtr));
mega64 146:03e976389d16 158 return newValue;
mega64 146:03e976389d16 159 }
mega64 146:03e976389d16 160
mega64 146:03e976389d16 161
mega64 146:03e976389d16 162 uint8_t core_util_atomic_decr_u8(uint8_t *valuePtr, uint8_t delta)
mega64 146:03e976389d16 163 {
mega64 146:03e976389d16 164 uint8_t newValue;
mega64 146:03e976389d16 165 do {
mega64 146:03e976389d16 166 newValue = __LDREXB((volatile uint8_t*)valuePtr) - delta;
mega64 146:03e976389d16 167 } while (__STREXB(newValue, (volatile uint8_t*)valuePtr));
mega64 146:03e976389d16 168 return newValue;
mega64 146:03e976389d16 169 }
mega64 146:03e976389d16 170
mega64 146:03e976389d16 171 uint16_t core_util_atomic_decr_u16(uint16_t *valuePtr, uint16_t delta)
mega64 146:03e976389d16 172 {
mega64 146:03e976389d16 173 uint16_t newValue;
mega64 146:03e976389d16 174 do {
mega64 146:03e976389d16 175 newValue = __LDREXH((volatile uint16_t*)valuePtr) - delta;
mega64 146:03e976389d16 176 } while (__STREXH(newValue, (volatile uint16_t*)valuePtr));
mega64 146:03e976389d16 177 return newValue;
mega64 146:03e976389d16 178 }
mega64 146:03e976389d16 179
mega64 146:03e976389d16 180 uint32_t core_util_atomic_decr_u32(uint32_t *valuePtr, uint32_t delta)
mega64 146:03e976389d16 181 {
mega64 146:03e976389d16 182 uint32_t newValue;
mega64 146:03e976389d16 183 do {
mega64 146:03e976389d16 184 newValue = __LDREXW((volatile uint32_t*)valuePtr) - delta;
mega64 146:03e976389d16 185 } while (__STREXW(newValue, (volatile uint32_t*)valuePtr));
mega64 146:03e976389d16 186 return newValue;
mega64 146:03e976389d16 187 }
mega64 146:03e976389d16 188
mega64 146:03e976389d16 189 #else
mega64 146:03e976389d16 190
mega64 146:03e976389d16 191 bool core_util_atomic_cas_u8(uint8_t *ptr, uint8_t *expectedCurrentValue, uint8_t desiredValue)
mega64 146:03e976389d16 192 {
mega64 146:03e976389d16 193 bool success;
mega64 146:03e976389d16 194 uint8_t currentValue;
mega64 146:03e976389d16 195 core_util_critical_section_enter();
mega64 146:03e976389d16 196 currentValue = *ptr;
mega64 146:03e976389d16 197 if (currentValue == *expectedCurrentValue) {
mega64 146:03e976389d16 198 *ptr = desiredValue;
mega64 146:03e976389d16 199 success = true;
mega64 146:03e976389d16 200 } else {
mega64 146:03e976389d16 201 *expectedCurrentValue = currentValue;
mega64 146:03e976389d16 202 success = false;
mega64 146:03e976389d16 203 }
mega64 146:03e976389d16 204 core_util_critical_section_exit();
mega64 146:03e976389d16 205 return success;
mega64 146:03e976389d16 206 }
mega64 146:03e976389d16 207
mega64 146:03e976389d16 208 bool core_util_atomic_cas_u16(uint16_t *ptr, uint16_t *expectedCurrentValue, uint16_t desiredValue)
mega64 146:03e976389d16 209 {
mega64 146:03e976389d16 210 bool success;
mega64 146:03e976389d16 211 uint16_t currentValue;
mega64 146:03e976389d16 212 core_util_critical_section_enter();
mega64 146:03e976389d16 213 currentValue = *ptr;
mega64 146:03e976389d16 214 if (currentValue == *expectedCurrentValue) {
mega64 146:03e976389d16 215 *ptr = desiredValue;
mega64 146:03e976389d16 216 success = true;
mega64 146:03e976389d16 217 } else {
mega64 146:03e976389d16 218 *expectedCurrentValue = currentValue;
mega64 146:03e976389d16 219 success = false;
mega64 146:03e976389d16 220 }
mega64 146:03e976389d16 221 core_util_critical_section_exit();
mega64 146:03e976389d16 222 return success;
mega64 146:03e976389d16 223 }
mega64 146:03e976389d16 224
mega64 146:03e976389d16 225
mega64 146:03e976389d16 226 bool core_util_atomic_cas_u32(uint32_t *ptr, uint32_t *expectedCurrentValue, uint32_t desiredValue)
mega64 146:03e976389d16 227 {
mega64 146:03e976389d16 228 bool success;
mega64 146:03e976389d16 229 uint32_t currentValue;
mega64 146:03e976389d16 230 core_util_critical_section_enter();
mega64 146:03e976389d16 231 currentValue = *ptr;
mega64 146:03e976389d16 232 if (currentValue == *expectedCurrentValue) {
mega64 146:03e976389d16 233 *ptr = desiredValue;
mega64 146:03e976389d16 234 success = true;
mega64 146:03e976389d16 235 } else {
mega64 146:03e976389d16 236 *expectedCurrentValue = currentValue;
mega64 146:03e976389d16 237 success = false;
mega64 146:03e976389d16 238 }
mega64 146:03e976389d16 239 core_util_critical_section_exit();
mega64 146:03e976389d16 240 return success;
mega64 146:03e976389d16 241 }
mega64 146:03e976389d16 242
mega64 146:03e976389d16 243
mega64 146:03e976389d16 244 uint8_t core_util_atomic_incr_u8(uint8_t *valuePtr, uint8_t delta)
mega64 146:03e976389d16 245 {
mega64 146:03e976389d16 246 uint8_t newValue;
mega64 146:03e976389d16 247 core_util_critical_section_enter();
mega64 146:03e976389d16 248 newValue = *valuePtr + delta;
mega64 146:03e976389d16 249 *valuePtr = newValue;
mega64 146:03e976389d16 250 core_util_critical_section_exit();
mega64 146:03e976389d16 251 return newValue;
mega64 146:03e976389d16 252 }
mega64 146:03e976389d16 253
mega64 146:03e976389d16 254 uint16_t core_util_atomic_incr_u16(uint16_t *valuePtr, uint16_t delta)
mega64 146:03e976389d16 255 {
mega64 146:03e976389d16 256 uint16_t newValue;
mega64 146:03e976389d16 257 core_util_critical_section_enter();
mega64 146:03e976389d16 258 newValue = *valuePtr + delta;
mega64 146:03e976389d16 259 *valuePtr = newValue;
mega64 146:03e976389d16 260 core_util_critical_section_exit();
mega64 146:03e976389d16 261 return newValue;
mega64 146:03e976389d16 262 }
mega64 146:03e976389d16 263
mega64 146:03e976389d16 264 uint32_t core_util_atomic_incr_u32(uint32_t *valuePtr, uint32_t delta)
mega64 146:03e976389d16 265 {
mega64 146:03e976389d16 266 uint32_t newValue;
mega64 146:03e976389d16 267 core_util_critical_section_enter();
mega64 146:03e976389d16 268 newValue = *valuePtr + delta;
mega64 146:03e976389d16 269 *valuePtr = newValue;
mega64 146:03e976389d16 270 core_util_critical_section_exit();
mega64 146:03e976389d16 271 return newValue;
mega64 146:03e976389d16 272 }
mega64 146:03e976389d16 273
mega64 146:03e976389d16 274
mega64 146:03e976389d16 275 uint8_t core_util_atomic_decr_u8(uint8_t *valuePtr, uint8_t delta)
mega64 146:03e976389d16 276 {
mega64 146:03e976389d16 277 uint8_t newValue;
mega64 146:03e976389d16 278 core_util_critical_section_enter();
mega64 146:03e976389d16 279 newValue = *valuePtr - delta;
mega64 146:03e976389d16 280 *valuePtr = newValue;
mega64 146:03e976389d16 281 core_util_critical_section_exit();
mega64 146:03e976389d16 282 return newValue;
mega64 146:03e976389d16 283 }
mega64 146:03e976389d16 284
mega64 146:03e976389d16 285 uint16_t core_util_atomic_decr_u16(uint16_t *valuePtr, uint16_t delta)
mega64 146:03e976389d16 286 {
mega64 146:03e976389d16 287 uint16_t newValue;
mega64 146:03e976389d16 288 core_util_critical_section_enter();
mega64 146:03e976389d16 289 newValue = *valuePtr - delta;
mega64 146:03e976389d16 290 *valuePtr = newValue;
mega64 146:03e976389d16 291 core_util_critical_section_exit();
mega64 146:03e976389d16 292 return newValue;
mega64 146:03e976389d16 293 }
mega64 146:03e976389d16 294
mega64 146:03e976389d16 295 uint32_t core_util_atomic_decr_u32(uint32_t *valuePtr, uint32_t delta)
mega64 146:03e976389d16 296 {
mega64 146:03e976389d16 297 uint32_t newValue;
mega64 146:03e976389d16 298 core_util_critical_section_enter();
mega64 146:03e976389d16 299 newValue = *valuePtr - delta;
mega64 146:03e976389d16 300 *valuePtr = newValue;
mega64 146:03e976389d16 301 core_util_critical_section_exit();
mega64 146:03e976389d16 302 return newValue;
mega64 146:03e976389d16 303 }
mega64 146:03e976389d16 304
mega64 146:03e976389d16 305 #endif
mega64 146:03e976389d16 306
mega64 146:03e976389d16 307
mega64 146:03e976389d16 308 bool core_util_atomic_cas_ptr(void **ptr, void **expectedCurrentValue, void *desiredValue) {
mega64 146:03e976389d16 309 return core_util_atomic_cas_u32(
mega64 146:03e976389d16 310 (uint32_t *)ptr,
mega64 146:03e976389d16 311 (uint32_t *)expectedCurrentValue,
mega64 146:03e976389d16 312 (uint32_t)desiredValue);
mega64 146:03e976389d16 313 }
mega64 146:03e976389d16 314
mega64 146:03e976389d16 315 void *core_util_atomic_incr_ptr(void **valuePtr, ptrdiff_t delta) {
mega64 146:03e976389d16 316 return (void *)core_util_atomic_incr_u32((uint32_t *)valuePtr, (uint32_t)delta);
mega64 146:03e976389d16 317 }
mega64 146:03e976389d16 318
mega64 146:03e976389d16 319 void *core_util_atomic_decr_ptr(void **valuePtr, ptrdiff_t delta) {
mega64 146:03e976389d16 320 return (void *)core_util_atomic_decr_u32((uint32_t *)valuePtr, (uint32_t)delta);
mega64 146:03e976389d16 321 }
mega64 146:03e976389d16 322