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/

Committer:
mega64
Date:
Tue Feb 14 21:52:10 2017 +0000
Revision:
11:79a2d67cd509
Parent:
0:38ccae254a29
repair the effects of improvements in the mbed environment (Ch.1, serial_set_flow_control )

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mega64 0:38ccae254a29 1 /* mbed Microcontroller Library
mega64 0:38ccae254a29 2 * Copyright (c) 2006-2013 ARM Limited
mega64 0:38ccae254a29 3 *
mega64 0:38ccae254a29 4 * Licensed under the Apache License, Version 2.0 (the "License");
mega64 0:38ccae254a29 5 * you may not use this file except in compliance with the License.
mega64 0:38ccae254a29 6 * You may obtain a copy of the License at
mega64 0:38ccae254a29 7 *
mega64 0:38ccae254a29 8 * http://www.apache.org/licenses/LICENSE-2.0
mega64 0:38ccae254a29 9 *
mega64 0:38ccae254a29 10 * Unless required by applicable law or agreed to in writing, software
mega64 0:38ccae254a29 11 * distributed under the License is distributed on an "AS IS" BASIS,
mega64 0:38ccae254a29 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mega64 0:38ccae254a29 13 * See the License for the specific language governing permissions and
mega64 0:38ccae254a29 14 * limitations under the License.
mega64 0:38ccae254a29 15 */
mega64 0:38ccae254a29 16 #include "SerialBase.h"
mega64 0:38ccae254a29 17 #include "wait_api.h"
mega64 0:38ccae254a29 18
mega64 11:79a2d67cd509 19 // for 030F4 flow control not implemented (N.S.)
mega64 11:79a2d67cd509 20 #undef DEVICE_SERIAL_FC
mega64 11:79a2d67cd509 21
mega64 0:38ccae254a29 22 #if DEVICE_SERIAL
mega64 0:38ccae254a29 23
mega64 0:38ccae254a29 24 namespace mbed {
mega64 0:38ccae254a29 25
mega64 0:38ccae254a29 26 SerialBase::SerialBase(PinName tx, PinName rx) : _serial(), _baud(9600) {
mega64 0:38ccae254a29 27 serial_init(&_serial, tx, rx);
mega64 0:38ccae254a29 28 serial_irq_handler(&_serial, SerialBase::_irq_handler, (uint32_t)this);
mega64 0:38ccae254a29 29 }
mega64 0:38ccae254a29 30
mega64 0:38ccae254a29 31 void SerialBase::baud(int baudrate) {
mega64 0:38ccae254a29 32 serial_baud(&_serial, baudrate);
mega64 0:38ccae254a29 33 _baud = baudrate;
mega64 0:38ccae254a29 34 }
mega64 0:38ccae254a29 35
mega64 0:38ccae254a29 36 void SerialBase::format(int bits, Parity parity, int stop_bits) {
mega64 0:38ccae254a29 37 serial_format(&_serial, bits, (SerialParity)parity, stop_bits);
mega64 0:38ccae254a29 38 }
mega64 0:38ccae254a29 39
mega64 0:38ccae254a29 40 int SerialBase::readable() {
mega64 0:38ccae254a29 41 return serial_readable(&_serial);
mega64 0:38ccae254a29 42 }
mega64 0:38ccae254a29 43
mega64 0:38ccae254a29 44
mega64 0:38ccae254a29 45 int SerialBase::writeable() {
mega64 0:38ccae254a29 46 return serial_writable(&_serial);
mega64 0:38ccae254a29 47 }
mega64 0:38ccae254a29 48
mega64 0:38ccae254a29 49 void SerialBase::attach(void (*fptr)(void), IrqType type) {
mega64 0:38ccae254a29 50 if (fptr) {
mega64 0:38ccae254a29 51 _irq[type].attach(fptr);
mega64 0:38ccae254a29 52 serial_irq_set(&_serial, (SerialIrq)type, 1);
mega64 0:38ccae254a29 53 } else {
mega64 0:38ccae254a29 54 serial_irq_set(&_serial, (SerialIrq)type, 0);
mega64 0:38ccae254a29 55 }
mega64 0:38ccae254a29 56 }
mega64 0:38ccae254a29 57
mega64 0:38ccae254a29 58 void SerialBase::_irq_handler(uint32_t id, SerialIrq irq_type) {
mega64 0:38ccae254a29 59 SerialBase *handler = (SerialBase*)id;
mega64 0:38ccae254a29 60 handler->_irq[irq_type].call();
mega64 0:38ccae254a29 61 }
mega64 0:38ccae254a29 62
mega64 0:38ccae254a29 63 int SerialBase::_base_getc() {
mega64 0:38ccae254a29 64 return serial_getc(&_serial);
mega64 0:38ccae254a29 65 }
mega64 0:38ccae254a29 66
mega64 0:38ccae254a29 67 int SerialBase::_base_putc(int c) {
mega64 0:38ccae254a29 68 serial_putc(&_serial, c);
mega64 0:38ccae254a29 69 return c;
mega64 0:38ccae254a29 70 }
mega64 0:38ccae254a29 71
mega64 0:38ccae254a29 72 void SerialBase::send_break() {
mega64 0:38ccae254a29 73 // Wait for 1.5 frames before clearing the break condition
mega64 0:38ccae254a29 74 // This will have different effects on our platforms, but should
mega64 0:38ccae254a29 75 // ensure that we keep the break active for at least one frame.
mega64 0:38ccae254a29 76 // We consider a full frame (1 start bit + 8 data bits bits +
mega64 0:38ccae254a29 77 // 1 parity bit + 2 stop bits = 12 bits) for computation.
mega64 0:38ccae254a29 78 // One bit time (in us) = 1000000/_baud
mega64 0:38ccae254a29 79 // Twelve bits: 12000000/baud delay
mega64 0:38ccae254a29 80 // 1.5 frames: 18000000/baud delay
mega64 0:38ccae254a29 81 serial_break_set(&_serial);
mega64 0:38ccae254a29 82 wait_us(18000000/_baud);
mega64 0:38ccae254a29 83 serial_break_clear(&_serial);
mega64 0:38ccae254a29 84 }
mega64 0:38ccae254a29 85
mega64 0:38ccae254a29 86 #if DEVICE_SERIAL_FC
mega64 0:38ccae254a29 87 void SerialBase::set_flow_control(Flow type, PinName flow1, PinName flow2) {
mega64 0:38ccae254a29 88 FlowControl flow_type = (FlowControl)type;
mega64 0:38ccae254a29 89 switch(type) {
mega64 0:38ccae254a29 90 case RTS:
mega64 0:38ccae254a29 91 serial_set_flow_control(&_serial, flow_type, flow1, NC);
mega64 0:38ccae254a29 92 break;
mega64 0:38ccae254a29 93
mega64 0:38ccae254a29 94 case CTS:
mega64 0:38ccae254a29 95 serial_set_flow_control(&_serial, flow_type, NC, flow1);
mega64 0:38ccae254a29 96 break;
mega64 0:38ccae254a29 97
mega64 0:38ccae254a29 98 case RTSCTS:
mega64 0:38ccae254a29 99 case Disabled:
mega64 0:38ccae254a29 100 serial_set_flow_control(&_serial, flow_type, flow1, flow2);
mega64 0:38ccae254a29 101 break;
mega64 0:38ccae254a29 102
mega64 0:38ccae254a29 103 default:
mega64 0:38ccae254a29 104 break;
mega64 0:38ccae254a29 105 }
mega64 0:38ccae254a29 106 }
mega64 0:38ccae254a29 107 #endif
mega64 0:38ccae254a29 108
mega64 0:38ccae254a29 109 } // namespace mbed
mega64 0:38ccae254a29 110
mega64 0:38ccae254a29 111 #endif