UART1 Interrupt Service Routine (ISR) for Embedded Systems

This is an interrupt service routine for UART1 in an embedded system. It is triggered when there is a data received (RI flag set) from the UART1 interface.

The first line of the ISR defines a static variable called 'BlueTooth', which will store the received data byte.

The next lines check if the received data byte is valid (not equal to 0) and then use a switch statement to determine the action to be taken based on the received character.

If the received character is 'Q', 'W', 'E', 'R', or 'T', it sets the global variable 'keyvalue' to 1, 2, 3, 4, or 5 respectively.

If the received character is 'Y', it toggles the global variable 'Mode', sets the global variable 'DistFlag' to 0, sets the global variable 'ms_Value' to 0, and calls the 'Stop()' function.

Overall, this ISR is responsible for processing incoming data from UART1 and using it to control the behavior of the embedded system.