The -O3 part cannot be compiled due to insufficient ROM space.įrom example 2, -Os is the best choice, and -O1 makes it faster but the amount of ROM is used more which must see if there is a lot of code running.įrom this article, you will find that when using SoftwareSerial, the use of STM32F030F4P6 for serial communication is more convenient, or using other pins as additional communication pins would be done as well. The -O2 type uses 15192 and 888 bytes of ROM and RAM, taking 402 milliseconds.Type -O1 uses 15708 and 888 bytes of ROM and RAM, with a prime time of 412 milliseconds.The -Os type consumes 13560 and 888 bytes of ROM and RAM, while the performance is 432 milliseconds.Found that if compiling with -Os to save ROM space but was the slowest speed with -O1, -O2 and O3 for maximum running speed but file size larger than the first. The next example is to convert prime numbers to use with SoftwareSerial. Flashing the LED that is connected to Pin PA4 which is already included with the microcontroller board by sending HIGH and waiting for 500 milliseconds, followed by LOW and waiting for another 500 milliseconds. The loop() function is divided into two parts: If using generic serial it will enable HW to run (then It won’t work … don’t be confused …) After that in setup(), the communication speed is specified as 9600 and the important thing is readers must enable UART but do not select no seneric “serial” as shown in Figure 2, because if disabled it will result in the inability to use serial classes. SoftwareSerial mySerial(PA10, PA9) // RX, TXįrom the code, the program has created an object named mySerial that sets pin PA10 to act as RX and PA9 as the pin for the receiver or TX inherited from the class SoftwareSerial. SoftwareSerial inherited from the Serial class of the Arduino framework, it is possible to use methods or commands as well.Įxample program for setting communication rate 9600bps to send Hi message every 1 second and to flash LED on STM32F030F4P6 every 500ms can be written as follows #include The invocation must import the header file SoftwareSerial.h as in the coding format as follows: #include Ĭommands for creating objects of type SoftwareSerial, the duty of the pin for RX and TX must be configured as follows.įor other commands, see the article Arduino: Serial Class. 64 bytes of RAM is used as a buffer as well as specifying the pin for acting as TX and RX with a maximum communication speed of 115200bps SoftwareSerial class is a class for serial communication with software libraries. RX of the board connected to TX of CH340E module.TX of the board connected to RX of RS232 module.GND of the board connected to GND of CH340E.3V3 of the board connected to 3V3 of RS232 module.Or connect to pin in the RS232 of the microcontroller board PA10 of ST32F030F4P6 connected to TX of CH340E.PA9 of microcontroller connected to RX of CH340E.GND of both board connected with each other.3V3 pin of the board connected to 3V3 of CH340E module or 5V Pin of the board connected to 5V of CH340E module.The connection between the microcontroller board and the CH340E module is as follows. RS232 module, we use CH340E with CH340 chip to convert USB signal TO TTL.Maximum is 4096 bytes.įigure 1 STM32F030F4P6 with CH340E module Figure 2 Arduino IDE setting Global variables use 876 bytes (21%) of dynamic memory, leaving 3220 bytes for local variables. Sketch uses 13188 bytes (80%) of program storage space. So we try to use SoftwareSerial of Arduino framework and use pins PA10 and PA9 to connect to RX and TX of USB-RS232 Converter Module as shown in Figure 1 and try to use it according to the settings of Arduino IDE as shown in Figure 2 and order toggle LED connected to pin PA4 found that when compiling the sample program is used, the ROM and RAM usage are 80% and 21% respectively as reported by the Arduino IDE as follows. From the article recommending the use of the board STM32F030F4P6 that uses serial communication with the use of additional libraries that do not have enough memory.
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