Diff: main.cpp

Revision:

0:14d431c4b518

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Jan 12 15:45:44 2017 +0000
@@ -0,0 +1,41 @@
+/* Sets the mbed up as Slave, and exchanges data with a Master,
+sending its own switch positions, and displaying those of the Master. as SPI slave.*/
+#include "mbed.h"
+SPISlave ser_port(PTD2,PTD3,PTD1,PTC16); // mosi, miso, sclk, ssel
+DigitalOut red_led(LED1); //red led
+DigitalOut green_led(LED2); //green led
+DigitalIn switch_ip1(SW2);
+DigitalIn switch_ip2(SW3);
+char switch_word ; //word we will send
+char recd_val; //value received from master
+
+int main() {
+    recd_val=0x00;
+//default formatting applied
+   while(1) {
+//set up switch_word from switches that are pressed
+   switch_word=0xa0; //set up a recognizable output pattern
+    if (switch_ip1==0)
+    switch_word=switch_word|0x01;
+    if (switch_ip2==0)
+   switch_word=switch_word|0x02;
+    if(ser_port.receive()) { //test if data transfer has occurred
+    recd_val = ser_port.read(); // Read byte from master
+    ser_port.reply(switch_word); // Make this the next reply
+ }
+//now set leds according to received word.
+     red_led=1; //preset both to off
+     green_led=1;
+     recd_val=recd_val&0x03; //AND out unwanted bits
+     if (recd_val==1)
+     {red_led=0; //red on, green off
+      green_led=1;}
+     if (recd_val==2)
+     {red_led=1; //red off, green on
+      green_led=0;}
+     if (recd_val==3){
+      red_led=0; //both on
+      green_led=0;
+   }
+ }
+}