Modification of mbed-src library only for STM32F030F4, very cheap microcontroller in 20-Pin TSSOP package, with 16Kbytes of Flash and 4Kbytes of Ram. **Target for online compilator must be Nucleo 32F030R8.**

Dependents:   STM32F031_blink_LED_2


Information

For programming similar chips in TSSOP20 package, but with 32kB flash: STM32F031F6 and STM32F050F6 (virtually identical to STM32F031F6 and no longer produced but still on sale), it is recommended to use NUCLEO-F031K6 as compiler platform, and the mbed library without the need for any modifications.

Just remember that the only significant difference between these chips and NUCLEO-F031K6 is the lack of pins: PB_0, PB_3, PB_4, PB_5, PB_6, PB_7, PA_11, PA_12, PA_15 in TSSOP-20.



STM32F030F4 pinout (pin functions supported in mbed library).

/media/uploads/mega64/mbedf4.jpg

other pins:

Pin nrPin nameConnectedST-LINK on Nucleo (programming and debug)
1.BOOT0GND
4.NRSTCN4 pin 5
5.VDDA+3.3V
15.VSSGNDCN4 pin 3
16.VDD+3.3V
19.SWDIOCN4 pin 4
20.SWCLKCN4 pin 2
  • Remove jumpers CN2 on Nucleo when CN4 is connected to STM32F030F4
  • NRST connection is not necessarily needed, but in this case, after programming it is necessary to manually reset the target processor


STM32R030F4 programming using Nucleo (any type):
/media/uploads/mega64/f4_nucleo.jpg Notes:

  • When programming using the Nucleo virtual disk (drag and drop) , first turn on the power STM32F030F4, and then connect Nucleo to USB. When programming with "ST-LINK Utility", it does not matter.




STM32R030F4 programming using Arduino (as a simple USB-Serial converter) and FlyMcu program:
/media/uploads/mega64/f4_arduino.jpg

Notes:

  • For Usart in STM32F030F4, only 5V tolerant TX, RX pins are pins 17 and 18. Just their uses internal serial bootloader, so you can use such Arduino or other USB-Serial converter operating as standard 5V.
  • Where used FlyMcu, binary file from online compiler Mbed need to convert to intel hex file and during the conversion add the data offset 0x08000000 (or if offset is 0, manually add/edit the first line of the .hex file to ":020000040800F2").
  • During programming procedure, pin 1 (BOOT0) should be connected to 3.3 V. And before contact with the loader program, temporarily pin 4 (NRST) shorted to GND to reset the chip. After programming BOOT0 is connected to GND.
  • In this set with Arduino Uno, the "Flash loader demonstrator" from STM does not work (does not recognize the response from the chip at the initial stage of connection). But with Arduino Duemilanove program "STM Flash loader demonstrator" works perfectly (ver. 2.7.0). And do not need any additional file conversion (as the need for FlyMcu). You can use a binary file directly from the on-line compiler mbed.

Warning.
Because of the small size of the STM32F030F4 flash, for programs that use UART, it is proposed not to use the Serial class but use the <cstdio> (stdio.h) functions that directly use stdout and stdin (e.g printf().putchar(),getchar(),vprintf(),scanf() ).

Example:

version with serial class

#include "mbed.h"
Serial pc(USBTX, USBRX); // tx, rx

int main()
{

    pc.printf("Hello World!\n");

}

consuming 13.7kB FLASH and 1.5kB RAM

but this:

version without serial class

#include "mbed.h"
int main()
{

    printf("Hello World!\n");

}

consuming only 8.7kB FLASH and 0.4kB RAM

5kB used flash difference (with 16kB total size) !!!

However, if you need other than the default UART settings for stdin and stdout (that is 9600b, pins PA_2, PA_3), you can do as an example:

change uart pins and speed

#include "mbed.h"

// declarations needed to change here the parameters of stdio UART
extern int stdio_uart_inited;
extern serial_t stdio_uart; 

int main()
{
    // for change pins
    serial_init(&stdio_uart, PA_9,PA_10);
    stdio_uart_inited=1;

    // for change baud rate
    serial_baud(&stdio_uart, 115000);


    printf("Hello World!\n");

}




uVision users

In the case of online compilation of the program with this library using Keil, to prevent linker errors set in the project options "One ELF Section per Function" and Optimisation: Level 2.



Additional information (and inspiration for this modification):

http://developer.mbed.org/forum/electronics/topic/5184/

http://developer.mbed.org/questions/4643/Does-mbed-support-STM32F030F4/

http://developer.mbed.org/questions/2927/mbed-on-other-packages-stm32f030f4-TSSOP/

http://developer.mbed.org/questions/4139/Programming-STM32F030F4-with-Nucleo-F030/

api/mbed_interface.h

Committer:
mega64
Date:
2017-02-14
Revision:
11:79a2d67cd509
Parent:
0:38ccae254a29

File content as of revision 11:79a2d67cd509:

/* 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_INTERFACE_H
#define MBED_INTERFACE_H

#include "device.h"

/* Mbed interface mac address
 * if MBED_MAC_ADD_x are zero, interface uid sets mac address,
 * otherwise MAC_ADD_x are used.
 */
#define MBED_MAC_ADDR_INTERFACE 0x00
#define MBED_MAC_ADDR_0  MBED_MAC_ADDR_INTERFACE
#define MBED_MAC_ADDR_1  MBED_MAC_ADDR_INTERFACE
#define MBED_MAC_ADDR_2  MBED_MAC_ADDR_INTERFACE
#define MBED_MAC_ADDR_3  MBED_MAC_ADDR_INTERFACE
#define MBED_MAC_ADDR_4  MBED_MAC_ADDR_INTERFACE
#define MBED_MAC_ADDR_5  MBED_MAC_ADDR_INTERFACE
#define MBED_MAC_ADDRESS_SUM (MBED_MAC_ADDR_0 | MBED_MAC_ADDR_1 | MBED_MAC_ADDR_2 | MBED_MAC_ADDR_3 | MBED_MAC_ADDR_4 | MBED_MAC_ADDR_5)

#ifdef __cplusplus
extern "C" {
#endif

#if DEVICE_SEMIHOST

/** Functions to control the mbed interface
 *
 * mbed Microcontrollers have a built-in interface to provide functionality such as
 * drag-n-drop download, reset, serial-over-usb, and access to the mbed local file
 * system. These functions provide means to control the interface suing semihost
 * calls it supports.
 */

/** Determine whether the mbed interface is connected, based on whether debug is enabled
 *
 *  @returns
 *    1 if interface is connected,
 *    0 otherwise
 */
int mbed_interface_connected(void);

/** Instruct the mbed interface to reset, as if the reset button had been pressed
 *
 *  @returns
 *    1 if successful,
 *    0 otherwise (e.g. interface not present)
 */
int mbed_interface_reset(void);

/** This will disconnect the debug aspect of the interface, so semihosting will be disabled.
 * The interface will still support the USB serial aspect
 *
 *  @returns
 *    0 if successful,
 *   -1 otherwise (e.g. interface not present)
 */
int mbed_interface_disconnect(void);

/** This will disconnect the debug aspect of the interface, and if the USB cable is not
 * connected, also power down the interface. If the USB cable is connected, the interface
 * will remain powered up and visible to the host
 *
 *  @returns
 *    0 if successful,
 *   -1 otherwise (e.g. interface not present)
 */
int mbed_interface_powerdown(void);

/** This returns a string containing the 32-character UID of the mbed interface
 *  This is a weak function that can be overwritten if required
 *
 *  @param uid A 33-byte array to write the null terminated 32-byte string
 *
 *  @returns
 *    0 if successful,
 *   -1 otherwise (e.g. interface not present)
 */
int mbed_interface_uid(char *uid);

#endif

/** This returns a unique 6-byte MAC address, based on the interface UID
 * If the interface is not present, it returns a default fixed MAC address (00:02:F7:F0:00:00)
 *
 * This is a weak function that can be overwritten if you want to provide your own mechanism to
 * provide a MAC address.
 *
 *  @param mac A 6-byte array to write the MAC address
 */
void mbed_mac_address(char *mac);

/** Cause the mbed to flash the BLOD (Blue LEDs Of Death) sequence
 */
void mbed_die(void);

#ifdef __cplusplus
}
#endif

#endif