phil dani
/
I2CSlave
I2C Slave Example
Fork of HelloWorld by
main.cpp
- Committer:
- Kit1
- Date:
- 2013-08-29
- Revision:
- 3:1bb80997f316
- Parent:
- 2:42d461c96301
File content as of revision 3:1bb80997f316:
/*Program Example 7.6: I2C Slave, when called transfers switch state to mbed acting as Master, and displays state of Master’ s switches on its leds. */ #include <mbed.h> 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 char recd_val; //value received from master int main() { slave.address(0x52); while (1) { //set up switch_word from switches that are pressed switch_word=0xa0; //set up a recognizable output pattern if (switch_ip1==1) switch_word=switch_word|0x01; if (switch_ip2==1) switch_word=switch_word|0x02; slave.write(switch_word); //load up word to send //test for I2C, and act accordingly int i = slave.receive(); if (i == 3){ //slave is addressed, Master will write recd_val= slave.read(); //now set leds according to received word 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; } } } }