SPI maestro

Dependencies:   mbed

Files at this revision

API Documentation at this revision

Comitter:
jangelgm
Date:
Tue Mar 07 11:28:18 2017 +0000
Commit message:
SPI maestro

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file
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;
+                }
+    }
+}
\ No newline at end of file
diff -r 000000000000 -r bf809e86f7da mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Mar 07 11:28:18 2017 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/6c34061e7c34
\ No newline at end of file