Diff: main.cpp

Revision:

0:c912ef4f5206

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Jan 12 15:45:25 2017 +0000
@@ -0,0 +1,40 @@
+/*Sets the mbed up as Master, and exchanges data with a slave, sending its own switch positions, and displaying those of the slave.*/
+#include "mbed.h"
+SPI ser_port(PTD2, PTD3, PTD1); //mosi, miso, sclk
+DigitalOut red_led(LED1); //red led
+DigitalOut green_led(LED2); //green led
+DigitalOut cs(PTC16); //this acts as “slave select”
+DigitalIn switch_ip1(SW2);
+DigitalIn switch_ip2(SW3);
+char switch_word ; //word we will send
+char recd_val; //value return from slave
+
+int main() {
+   while (1){
+//Default settings for SPI Master chosen, no need for further configuration
+//Set up the word to be sent, by testing switch inputs
+   switch_word=0xa0; //set up a recognizable output pattern
+     if (switch_ip1==0)
+     switch_word=switch_word|0x01; //OR in lsb, check if the botton is pressed
+     if (switch_ip2==0)
+     switch_word=switch_word|0x02; //OR in next lsb, check if the botton is pressed
+     cs = 0; //select slave ("active low")
+     recd_val=ser_port.write(switch_word); //send switch_word and receive data. set a initial value for recd_val (dummy)
+     cs = 1;
+     wait(0.01);//wait for slave to response
+//set leds according to incoming word from slave
+     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;
+   }
+ }
+}