Nothing Special / mbed-STM32F030F4

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

STM32F030F4 pinout (pin functions supported in mbed library).

other pins:

• 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):
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:

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:

#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:

#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:

#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");

}

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/

reduce size (runtime errors strings)