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How does an ATmega328P microcontroller communicate with a PC?
In this tutorial we will learn how to program the USART (uart) of ATmega328P microcontroller to communicate with a Linux/ Windows PC using asynchronous serial communication protocol. The ATmega328p microcontroller will send and receive data (ASCII Strings) to a PC running either a Linux or Windows operating system using it’s (ATmega328p) UART pins.
How to add hex code to ATmega328P?
Hex code is uploaded into Atmega328p with AVRDUDE using USBasp Programmer. All Source codes including “Make” files are available on our Github Repo. We are using a 32 pin TQFP version of the ATmega328p microcontroller .If you are using the 28 pin DIP version,please make sure that the pin numbers match by referring to the data sheet of ATmega328p.
How to intiate data transmission in ATmega328P USART?
Writing a byte to the UDR0 register of ATmega328p USART will intiate data transmission. After the transmission UDRE0 flag is set to 1,indicating that buffer is ready to transmit again. UDRE0 bit is found in the UCSR0A register.
How is the AREF pin used in ATmega328P?
To measure it by any other power input or by the power of analog signal generating device, an analog voltage reference AREF will be used. This pin will detect the maximum value of the analog signal and then it will be able to give the proper output. AREF pin in ATmega328P is:
Which is USART protocol does ATmega328P support?
ATmega328p USART. Universal Synchronous and Asynchronous serial Receiver and Transmitter (USART) is a configurable peripheral of ATmega328p which supports both Synchronous (SPI) and asynchronous (Serial) communication protocols. In our case we will be dealing only with asynchronous communication.
How does ATmega328P work with ucsr0a Register?
The code for receiving the characters is almost same as the transmission program,Here we are enabling the receiver instead of the transmitter. The Atmega328p checks the status of the RXC0 bit in UCSR0A register continuously and waits for any data to be received.