Revision 3:1bb80997f316, committed 2013-08-29

Comitter:

Kit1

Date:

Thu Aug 29 15:01:15 2013 +0000

Parent:

2:42d461c96301

Commit message:

I2C Slave working

Changed in this revision

diff -r 42d461c96301 -r 1bb80997f316 Mmain.cpp
--- a/Mmain.cpp	Thu Aug 29 12:35:44 2013 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,45 +0,0 @@
-/*Program Example 7.5: I2C Master, transfers switch state to second mbed acting as slave, and
-displays state of slave’ s switches on its leds.
-*/
-#include "mbed.h"
-I2C i2c_port(p9, p10); //Configure a serial port, pins 9 and 10 are sda, scl
-DigitalOut red_led(LED1); //red led
-DigitalOut green_led(LED2); //green led
-DigitalIn switch_ip1(p5); //input switch
-DigitalIn switch_ip2(p6);
-char switch_word ; //word we will send
-char recd_val; //value received from slave
-const int addr = 0x52; //the I2C slave address, an arbitrary even number
-
-int main() {
-    while(1) {
-        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
-        //send a single byte of data, in correct I2C package
-        i2c_port.start(); //force a start condition
-        i2c_port.write(addr); //send the address
-        i2c_port.write(switch_word); //send one byte of data, ie switch_word
-        i2c_port.stop(); //force a stop condition
-        wait(0.002);
-        //receive a single byte of data, in correct I2C package
-        i2c_port.start();
-        i2c_port.write(addr|0x01); //send address, with R/W bit set to Read
-        recd_val=i2c_port.read(addr); //Read and save the received byte
-        i2c_port.stop(); //force a stop condition
-        //set leds according to word received 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;
-        }
-    }
-}

diff -r 42d461c96301 -r 1bb80997f316 main.cpp
--- a/main.cpp	Thu Aug 29 12:35:44 2013 +0000
+++ b/main.cpp	Thu Aug 29 15:01:15 2013 +0000
@@ -2,9 +2,9 @@
 displays state of Master’ s switches on its leds.
 */
 #include <mbed.h>
-I2CSlave slave(p9, p10); //Configure I2C slave
-DigitalOut red_led(p14); //red led
-DigitalOut green_led(p12); //green led
+I2CSlave slave(p28, p27); //Configure I2C slave
+DigitalOut red_led(LED1); //red led
+DigitalOut green_led(LED2); //green led
 DigitalIn switch_ip1(p5);
 DigitalIn switch_ip2(p6);
 char switch_word ; //word we will send
@@ -26,7 +26,7 @@
             recd_val= slave.read();
             //now set leds according to received word
             red_led=0; //preset both to 0
-            green_led=0;
+            green_led=0;            
             recd_val=recd_val&0x03; //AND out unwanted bits
             if (recd_val==1)
                 red_led=1;