Revision 0:4ec99b800425, committed 2017-03-07

Comitter:

jangelgm

Date:

Tue Mar 07 11:38:01 2017 +0000

Commit message:

UART

Changed in this revision

diff -r 000000000000 -r 4ec99b800425 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Mar 07 11:38:01 2017 +0000
@@ -0,0 +1,46 @@
+/*Program Example 7.9: Sets the mbed up for async communication, and exchanges data with
+a similar node, sending its own switch positions, and displaying those of the other.
+*/
+#include "mbed.h"
+Serial async_port(p9, p10); //set up TX and RX on pins 9 and 10
+
+DigitalOut red_led(p25); //red led
+DigitalOut green_led(p26); //green led
+DigitalOut strobe(p7); //a strobe to trigger the scope
+
+DigitalIn switch_ip1(p5);
+DigitalIn switch_ip2(p6);
+
+char switch_word ; //the word we will send
+char recd_val; //the received value
+
+int main()
+{
+    async_port.baud(9600); //set baud rate to 9600 (ie default)
+    //accept default format, of 8 bits, no parity
+    while (1) {
+    //Set up the word to be sent, by testing switch inputs
+        switch_word=0xa0; //set up a recognizable output pattern
+        if (switch_ip1==1)
+            switch_word=switch_word | 0x01; //OR in lsb
+        if (switch_ip2==1)
+            switch_word=switch_word | 0x02; //OR in next lsb
+        strobe =1; //short strobe pulse
+        wait_us(10);
+        strobe=0;
+        async_port.putc(switch_word); //transmit switch_word
+        if (async_port.readable()==1) //is there a character to be read?
+            recd_val=async_port.getc(); //if yes, then read it
+        red_led=0; //preset both to 0
+        green_led=0;
+        recd_val=recd_val & 0x03; //AND out unwanted bits
+        if (recd_val==1)
+            red_led=1;
+        if (recd_val==2)
+            green_led=1;
+        if (recd_val==3) {
+            red_led=1;
+            green_led=1;
+        }
+    }
+}
\ No newline at end of file

diff -r 000000000000 -r 4ec99b800425 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Mar 07 11:38:01 2017 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/6c34061e7c34
\ No newline at end of file