I2CSlave
Use I2C Slave to communicate with I2C Master.
Synchronization level: not protected.
I2CSlave class reference
| Public Member Functions | |
| I2CSlave (PinName sda, PinName scl) | |
| Create an I2C Slave interface, connected to the specified pins. More... | |
| I2CSlave (const i2c_pinmap_t &static_pinmap) | |
| Create an I2C Slave interface, connected to the specified pins. More... | |
| void | frequency (int hz) |
| Set the frequency of the I2C interface. More... | |
| int | receive (void) |
| Check if this I2C Slave has been addressed. More... | |
| int | read (char *data, int length) |
| Read specified number of bytes from an I2C master. More... | |
| int | read (void) |
| Read a single byte from an I2C master. More... | |
| int | write (const char *data, int length) |
| Write to an I2C master. More... | |
| int | write (int data) |
| Write a single byte to an I2C master. More... | |
| void | address (int address) |
| Set the I2C slave address. More... | |
| void | stop (void) |
| Reset the I2C slave back into the known ready receiving state. More... | |
I2CSlave example
Try this example to see how an I2C responder works.
/*
* Copyright (c) 2006-2020 Arm Limited and affiliates.
* SPDX-License-Identifier: Apache-2.0
*/
#include <mbed.h>
#if !DEVICE_I2CSLAVE
#error [NOT_SUPPORTED] I2C Slave is not supported
#endif
I2CSlave slave(D14, D15);
int main()
{
char buf[10];
char msg[] = "Slave!";
slave.address(0xA0);
while (1) {
int i = slave.receive();
switch (i) {
case I2CSlave::ReadAddressed:
slave.write(msg, strlen(msg) + 1); // Includes null char
break;
case I2CSlave::WriteGeneral:
slave.read(buf, 10);
printf("Read G: %s\n", buf);
break;
case I2CSlave::WriteAddressed:
slave.read(buf, 10);
printf("Read A: %s\n", buf);
break;
}
for (int i = 0; i < 10; i++) {
buf[i] = 0; // Clear buffer
}
}
}