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)

targets/TARGET_STM/port_api.c

Committer:
mega64
Date:
2017-04-27
Revision:
148:8b0b02bf146f
Parent:
146:03e976389d16

File content as of revision 148:8b0b02bf146f:

/* mbed Microcontroller Library
 *******************************************************************************
 * Copyright (c) 2016, STMicroelectronics
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of STMicroelectronics nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *******************************************************************************
 */
#include "port_api.h"
#include "pinmap.h"
#include "gpio_api.h"
#include "mbed_error.h"

#if DEVICE_PORTIN || DEVICE_PORTOUT

extern GPIO_TypeDef *Set_GPIO_Clock(uint32_t port_idx);

// high nibble = port number (0=A, 1=B, 2=C, 3=D, 4=E, 5=F, ...)
// low nibble  = pin number
PinName port_pin(PortName port, int pin_n)
{
    return (PinName)(pin_n + (port << 4));
}

void port_init(port_t *obj, PortName port, int mask, PinDirection dir)
{
    uint32_t port_index = (uint32_t)port;

    // Enable GPIO clock
    GPIO_TypeDef *gpio =  Set_GPIO_Clock(port_index);

    // Fill PORT object structure for future use
    obj->port      = port;
    obj->mask      = mask;
    obj->direction = dir;
    obj->reg_in    = &gpio->IDR;
    obj->reg_out   = &gpio->ODR;

    port_dir(obj, dir);
}

void port_dir(port_t *obj, PinDirection dir)
{
    uint32_t i;
    obj->direction = dir;
    for (i = 0; i < 16; i++) { // Process all pins
        if (obj->mask & (1 << i)) { // If the pin is used
            if (dir == PIN_OUTPUT) {
                pin_function(port_pin(obj->port, i), STM_PIN_DATA(STM_MODE_OUTPUT_PP, GPIO_NOPULL, 0));
            } else { // PIN_INPUT
                pin_function(port_pin(obj->port, i), STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
            }
        }
    }
}

void port_mode(port_t *obj, PinMode mode)
{
    uint32_t i;
    for (i = 0; i < 16; i++) { // Process all pins
        if (obj->mask & (1 << i)) { // If the pin is used
            pin_mode(port_pin(obj->port, i), mode);
        }
    }
}

void port_write(port_t *obj, int value)
{
    *obj->reg_out = (*obj->reg_out & ~obj->mask) | (value & obj->mask);
}

int port_read(port_t *obj)
{
    if (obj->direction == PIN_OUTPUT) {
        return (*obj->reg_out & obj->mask);
    } else { // PIN_INPUT
        return (*obj->reg_in & obj->mask);
    }
}

#endif