Continuous Write using USART
To write string continuously using USART, our code will perform the following opertions.
- Disable watchdog
- Create a new Serial struct to access all USART's
- initialize USART0 and makes it ready to transmit and recieve.
- Loop to send a string using the USART multiple times.This sends string from arduino through TxD0 pin.
- Disable USART0.