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#include "mbed.h"
#include "test_env.h"
#include <stdio.h>
#define ADDR (0xA0)
#define FREQ 100000
// ********************************************************
// This tests data transfer between two I2C interfaces on
// the same chip, one configured as master, the other as
// slave. Works on the LPC1768 mbed.
//
// Wiring:
// p28 <-> p9
// p27 <-> p10
// pull-up resistors on both lines
// ********************************************************
I2CSlave slave(p9, p10);
I2C master(p28, p27);
int main()
{
char sent = 'T', received;
master.frequency(FREQ);
slave.frequency(FREQ);
slave.address(ADDR);
// First transfer: master to slave
master.start();
master.write(ADDR);
master.write(sent);
if(slave.receive() != I2CSlave::WriteAddressed)
{
notify_completion(false);
return 1;
}
slave.read(&received, 1);
if(sent != received)
{
notify_completion(false);
return 1;
}
master.stop();
// Second transfer: slave to master
master.start();
master.write(ADDR | 1);
if(slave.receive() != I2CSlave::ReadAddressed)
{
notify_completion(false);
return 1;
}
slave.write(received);
received = master.read(0);
slave.stop();
notify_completion(received == sent);
}
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