Diff: main.cpp

Revision:

0:bf809e86f7da

diff -r 000000000000 -r bf809e86f7da main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Mar 07 11:28:18 2017 +0000
@@ -0,0 +1,44 @@
+ /*Program Example 7.2. 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(p11, p12, p13); //mosi, miso, sclk
+DigitalOut red_led(p25); //red led
+DigitalOut green_led(p26); //green led
+
+DigitalOut cs(p14); //this acts as “slave select”
+
+DigitalIn switch_ip1(p5);
+DigitalIn switch_ip2(p6);
+
+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==1)
+        switch_word=switch_word | 0x01; //OR in lsb
+    if (switch_ip2==1)
+        switch_word=switch_word | 0x02; //OR in next lsb
+    cs = 0; //select slave
+    recd_val=ser_port.write(switch_word); //send switch_word and receive data
+    cs = 1;
+    wait(0.01);
+    //set leds according to incoming word from slave
+    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;
+                }
+    }
+}
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