Brian Daniels / Mbed 2 deprecated I2CSlave

I2C Slave device. Mimics the 24LC256 in a very limited way (no addressing)

Dependencies:   mbed

Fork of I2CSlave by phil dani

main.cpp@3:1bb80997f316, 2013-08-29 (annotated)

Committer:
Kit1
Date:
Thu Aug 29 15:01:15 2013 +0000
Revision:
3:1bb80997f316
Parent:
2:42d461c96301
Child:
4:d1d5a02cc721
I2C Slave working

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Kit1 2:42d461c96301 1 /*Program Example 7.6: I2C Slave, when called transfers switch state to mbed acting as Master, and
Kit1 2:42d461c96301 2 displays state of Master’ s switches on its leds.
Kit1 2:42d461c96301 3 */
Kit1 2:42d461c96301 4 #include <mbed.h>
Kit1 3:1bb80997f316 5 I2CSlave slave(p28, p27); //Configure I2C slave
Kit1 3:1bb80997f316 6 DigitalOut red_led(LED1); //red led
Kit1 3:1bb80997f316 7 DigitalOut green_led(LED2); //green led
Kit1 2:42d461c96301 8 DigitalIn switch_ip1(p5);
Kit1 2:42d461c96301 9 DigitalIn switch_ip2(p6);
Kit1 2:42d461c96301 10 char switch_word ; //word we will send
Kit1 2:42d461c96301 11 char recd_val; //value received from master
Kit1 2:42d461c96301 12
Kit1 2:42d461c96301 13 int main() {
Kit1 2:42d461c96301 14 slave.address(0x52);
Kit1 2:42d461c96301 15 while (1) {
Kit1 2:42d461c96301 16 //set up switch_word from switches that are pressed
Kit1 2:42d461c96301 17 switch_word=0xa0; //set up a recognizable output pattern
Kit1 2:42d461c96301 18 if (switch_ip1==1)
Kit1 2:42d461c96301 19 switch_word=switch_word|0x01;
Kit1 2:42d461c96301 20 if (switch_ip2==1)
Kit1 2:42d461c96301 21 switch_word=switch_word|0x02;
Kit1 2:42d461c96301 22 slave.write(switch_word); //load up word to send
Kit1 2:42d461c96301 23 //test for I2C, and act accordingly
Kit1 2:42d461c96301 24 int i = slave.receive();
Kit1 2:42d461c96301 25 if (i == 3){ //slave is addressed, Master will write
Kit1 2:42d461c96301 26 recd_val= slave.read();
Kit1 2:42d461c96301 27 //now set leds according to received word
Kit1 2:42d461c96301 28 red_led=0; //preset both to 0
Kit1 3:1bb80997f316 29 green_led=0;
Kit1 2:42d461c96301 30 recd_val=recd_val&0x03; //AND out unwanted bits
Kit1 2:42d461c96301 31 if (recd_val==1)
Kit1 2:42d461c96301 32 red_led=1;
Kit1 2:42d461c96301 33 if (recd_val==2)
Kit1 2:42d461c96301 34 green_led=1;
Kit1 2:42d461c96301 35 if (recd_val==3){
Kit1 2:42d461c96301 36 red_led=1;
Kit1 2:42d461c96301 37 green_led=1;
Kit1 2:42d461c96301 38 }
Kit1 2:42d461c96301 39 }
Kit1 2:42d461c96301 40 }
Kit1 2:42d461c96301 41 }