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)

hal/gpio_api.h

Committer:
mega64
Date:
2017-04-27
Revision:
148:8b0b02bf146f
Parent:
147:38a0c20c7b3e

File content as of revision 148:8b0b02bf146f:


/** \addtogroup hal */
/** @{*/
/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef MBED_GPIO_API_H
#define MBED_GPIO_API_H

#include <stdint.h>
#include "device.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \defgroup hal_gpio GPIO HAL functions
 * @{
 */

/** Set the given pin as GPIO
 *
 * @param pin The pin to be set as GPIO
 * @return The GPIO port mask for this pin
 **/
uint32_t gpio_set(PinName pin);
/* Checks if gpio object is connected (pin was not initialized with NC)
 * @param pin The pin to be set as GPIO
 * @return 0 if port is initialized with NC
 **/
int gpio_is_connected(const gpio_t *obj);

/** Initialize the GPIO pin
 *
 * @param obj The GPIO object to initialize
 * @param pin The GPIO pin to initialize
 */
void gpio_init(gpio_t *obj, PinName pin);

/** Set the input pin mode
 *
 * @param obj  The GPIO object
 * @param mode The pin mode to be set
 */
void gpio_mode(gpio_t *obj, PinMode mode);

/** Set the pin direction
 *
 * @param obj       The GPIO object
 * @param direction The pin direction to be set
 */
void gpio_dir(gpio_t *obj, PinDirection direction);

/** Set the output value
 *
 * @param obj   The GPIO object
 * @param value The value to be set
 */
void gpio_write(gpio_t *obj, int value);

/** Read the input value
 *
 * @param obj The GPIO object
 * @return An integer value 1 or 0
 */
int gpio_read(gpio_t *obj);

// the following functions are generic and implemented in the common gpio.c file
// TODO: fix, will be moved to the common gpio header file

/** Init the input pin and set mode to PullDefault
 *
 * @param obj The GPIO object
 * @param pin The pin name
 */
void gpio_init_in(gpio_t* gpio, PinName pin);

/** Init the input pin and set the mode
 *
 * @param obj  The GPIO object
 * @param pin  The pin name
 * @param mode The pin mode to be set
 */
void gpio_init_in_ex(gpio_t* gpio, PinName pin, PinMode mode);

/** Init the output pin as an output, with predefined output value 0
 *
 * @param obj The GPIO object
 * @param pin The pin name
 * @return An integer value 1 or 0
 */
void gpio_init_out(gpio_t* gpio, PinName pin);

/** Init the pin as an output and set the output value
 *
 * @param obj   The GPIO object
 * @param pin   The pin name
 * @param value The value to be set
 */
void gpio_init_out_ex(gpio_t* gpio, PinName pin, int value);

/** Init the pin to be in/out
 *
 * @param obj       The GPIO object
 * @param pin       The pin name
 * @param direction The pin direction to be set
 * @param mode      The pin mode to be set
 * @param value     The value to be set for an output pin
 */
void gpio_init_inout(gpio_t* gpio, PinName pin, PinDirection direction, PinMode mode, int value);

/**@}*/

#ifdef __cplusplus
}
#endif

#endif

/** @}*/