Essential functions to get started with programming an AVR ATmega MCU

• Create a new file like main.c
• Include essential.c
• In the main.c create the main function and start programming

• USART
• SPI
• ADC

• more functionalities will be added regularly.

• To initialize USART use USARTinit(uint16_t ubrr_value). For various ubrr_value visit this site or check the datasheet.
• Read a character using USARTReadChar().
• Write a character using USARTWriteChar(char data).
• Read a string using USARTReadString(int si). Where int si is the size of the string to read.
• Send a string using USARTSendString(char s[]). Where char s[] is the string to be sent.

• To initilize Master use initMasterSPI().
• To initilize Slave use initSlaveSPI().
• To transmit data in Master mode use transmitMaster(unsigned char data).
• To receive data in Slave mode use receiveSlave().

• To initilize ADC use initADC().
• To read the input voltage use readADC(uint8_t ch). Where uint8_t ch is the channel.