the Arduino Mega 2560, compose a program that does the following. Initialize the serial port Seriall at 115200, 8N1. Initalize SPI as 1500000 baud, MSB first, mode 2. Whenever a character is received on Serial1, that character is to be sent over SPI. Whatever character is received from SPI should then be sent to Seriall. The program should continue until the "end of transmission" character, ASCII 4, is received on Serial1.