I2C Slave device. Mimics the 24LC256 in a very limited way (no addressing)
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Diff: main.cpp
- Revision:
- 2:42d461c96301
- Parent:
- 0:fb6bbc10ffa0
- Child:
- 3:1bb80997f316
--- a/main.cpp Sun Jan 01 20:57:57 2012 +0000 +++ b/main.cpp Thu Aug 29 12:35:44 2013 +0000 @@ -1,12 +1,41 @@ -#include "mbed.h" - -DigitalOut myled(LED1); - -int main() { - while(1) { - myled = 1; - wait(0.2); - myled = 0; - wait(0.2); - } -} +/*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(p9, p10); //Configure I2C slave +DigitalOut red_led(p14); //red led +DigitalOut green_led(p12); //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; + } + } + } +} \ No newline at end of file