[DOC] Updated README's for F0 and F4 examples to describe the needed board connections.

examples/stm32/f4/stm32f4-discovery/button/README

@@ -2,7 +2,11 @@
 README
 ------------------------------------------------------------------------------
 
-This example blinks the green LED on the ST STM32F4DISCOVERY eval board.
+This example blinks the GREEN LED on the ST STM32F4DISCOVERY eval board.
 
 When you press the 'USER' button, the blinking is slower.
 
+Board connections:
+------------------
+
+ <none required>

examples/stm32/f4/stm32f4-discovery/fancyblink/README

@@ -7,3 +7,7 @@ This is the smallest-possible example program using libopencm3.
 It's intended for the ST STM32F4DISCOVERY eval board. It should blink
 the LEDs on the board.
 
+Board connections:
+------------------
+
+ <none required>

examples/stm32/f4/stm32f4-discovery/mandelbrot/README

@@ -8,5 +8,7 @@ the ST STM32F4DISCOVERY eval board.
 A mandelbrot fractal is calculated and sent as "ascii-art" image through
 the USART2.
 
-The terminal settings for the receiving device/PC are 38400 8n1.
+Board connections:
+------------------
 
+  PA2	(USART2_TX)	TTL serial output (38400,8,N,1)

examples/stm32/f4/stm32f4-discovery/miniblink/README

@@ -5,5 +5,9 @@ README
 This is the smallest-possible example program using libopencm3.
 
 It's intended for the ST STM32F4DISCOVERY eval board. It should blink
-the blue LED on the board.
+the GREEN LED on the board.
 
+Board connections:
+------------------
+
+ <none required>

examples/stm32/f4/stm32f4-discovery/random/README

@@ -2,4 +2,11 @@
 README
 ------------------------------------------------------------------------------
 
-This example randomly blinks the green LED on the ST STM32F4DISCOVERY eval board.
+This example randomly blinks the GREEN LED on the ST STM32F4DISCOVERY eval
+board.
+
+Board connections:
+------------------
+
+ <none required>
+

examples/stm32/f4/stm32f4-discovery/tick_blink/README

@@ -1,8 +1,14 @@
+------------------------------------------------------------------------------
 README
-------
+------------------------------------------------------------------------------
 
 This example is the same as fancy_blink except that it uses the
 systick timer to generate time accurate delays. Shows how to set
 up the systick timer to create an interrupt every millisecond and
 how to write a delay routine (msleep) that can then delay for a
 specific number of milliseconds.
+
+Board connections:
+------------------
+
+ <none required>

examples/stm32/f4/stm32f4-discovery/usart/README

@@ -2,10 +2,12 @@
 README
 ------------------------------------------------------------------------------
 
-This example program sends some characters on USART2 on the
-ST STM32F4DISCOVERY eval board.
+This example program sends repeating sequence of characters "0123456789" on 
+USART2 on the ST STM32F4DISCOVERY eval board.
 
-The terminal settings for the receiving device/PC are 38400 8n1.
+The sending is done in a blocking way.
 
-The sending is done in a blocking way in the code.
+Board connections:
+------------------
 
+  PA2	(USART2_TX)	TTL serial output (38400,8,N,1)

examples/stm32/f4/stm32f4-discovery/usart_irq/README

@@ -5,10 +5,10 @@ README
 This example program echoes data sent in on USART2 on the
 ST STM32F4DISCOVERY eval board. Uses interrupts for that purpose.
 
-Connect your TTL RX device line to PA2 on the discovery board.
-Connect your TTL TX device line to PA3 on the discovery board.
+The sending is done in a nonblocking way.
 
-The terminal settings for the receiving device/PC are 38400 8n1.
-
-The sending is done in a blocking way in the code.
+Board connections:
+------------------
 
+  PA2	(USART2_TX)	TTL serial output (38400,8,N,1)
+  PA3	(USART2_RX)	TTL serial input (38400,8,N,1)

examples/stm32/f4/stm32f4-discovery/usb_cdcacm/README

@@ -5,3 +5,7 @@ README
 This example implements a USB CDC-ACM device (aka Virtual Serial Port)
 to demonstrate the use of the USB device stack.
 
+Board connections:
+------------------
+
+  CN5	(USB_OTG_FS)	USB acting as device, connect to computer