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