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if(DataRdyUSART()) // This means 'loop here until we get a new character in the receive buffer'
else {
if (data=='A'){
...
if(!(DataRdyUSART())){}' // This means 'loop here until we get a new character in the receive buffer'
else ......
while(!(DataRdyUSART())){}' // This means 'loop here until we get a new character in the receive buffer'