--- terminal.s-orig	2014-06-26 23:14:38.000000000 +1000
+++ terminal.s	2018-03-31 22:18:24.941482000 +1100
@@ -77,19 +77,24 @@
   ldr r0, = BIT14 @ USART1EN
   str r0, [r1]
 
-  @ Set PORTA pins 9 and 10 in alternate function mode
+  @ Set PORTA pin modes:  PA9 (TX)-OUTPUT, PA10 (RX)-INPUT, PA11 (CTS)-INPUT, PA12 (RTS)-OUTPUT
   ldr r1, = GPIOA_MODER
-  ldr r0, = 0x28280000 @ 2800 0000 is Reset value for Port A, and switch PA9 and PA10 to alternate function
+  ldr r0, = 0x2A80000 
   str r0, [r1]
 
-  @ Set alternate function 1 to enable USART1 pins on Port A
+  @ set PORTA Alternate Functions: PA9 (TX), PA10 (RX), PA11 (CTS), PA12 (RTS) all to AF1
   ldr r1, = GPIOA_AFRH
-  ldr r0, = 0x110      @ Alternate function 1 for TX and RX pins of USART1 on PORTA 
+  ldr r0, = 0x011110      @ Alternate function 1 for TX, RX, CTS and RTS pins of USART1 on PORTA  (tp)
   str r0, [r1]
 
-  @ Configure BRR by deviding the bus clock with the baud rate
+  @ Configure BRR by dividing the bus clock with the baud rate
   ldr r1, = USART1_BRR
-  movs r0, #0x46  @ 115200 bps, ein ganz kleines bisschen langsamer...
+  movs r0, #0x46  @ 115200 bps, ein ganz kleines bisschen langsamer... a little bit slower...
+  str r0, [r1]
+
+  @ Enable RTS/CTS flow control (tp)
+  ldr r1, = USART1_CR3
+  ldr r0, = 0x300      @  Enable RTS flow control, RTSE (bit 8) = 1, and CTSE (bit 9) = 1  
   str r0, [r1]
 
   @ Enable the USART, TX, and RX circuit