Uart: add receive

uart.c

@@ -36,6 +36,13 @@ void uart_init(void )
 	UART0_CR = 0x301; //Active Tx, Rx & FIFO
 }
 
+char uart_recv(void)
+{
+	while (UART0_FR & (1 << 4)) {
+	}
+	return UART0_DR & 0xFF;
+}
+
 void putc(char c){
 	//FIFO Full?
 	while(UART0_FR & (1<<5)){}

uart.h

@@ -12,5 +12,6 @@
 #define UART0_ICR (*(volatile unsigned *)(UART0_BASE + 0x44))
 
 void uart_init(void);
+char uart_recv(void);
 void putc(char c);
 void puts(const char *s);