void setup() {
SerialUSB.begin();
SerialUSB.println("I2C Slave example");
// attach the buffer
msg.data = buffer;
/* Init slave mode. Enables master too
* We are going to configure the slave device to
* - enable fast I2C (400khz)
* - dual addresses (can have 2 addresses per module)
* general call (accepts data writes to 0x00 on a broadcast basis)
*
* If the buffered example is enabled, then we also enable the
* buffer for rx and tx.
* Note you can independently enable/disable RX and TX buffers to
* allow a buffered read and direct writes. Useful if you don't know how
* much the master will read.
*/
#if USE_BUFFERED_EXAMPLE == 1
i2c_slave_enable(I2C1, I2C_FAST_MODE | I2C_SLAVE_DUAL_ADDRESS | I2C_SLAVE_GENERAL_CALL | I2C_SLAVE_USE_RX_BUFFER | I2C_SLAVE_USE_TX_BUFFER);
#else
i2c_slave_enable(I2C1, I2C_FAST_MODE | I2C_SLAVE_DUAL_ADDRESS | I2C_SLAVE_GENERAL_CALL);
#endif
// attach receive handler
i2c_slave_attach_recv_handler(I2C1, &msg, funcrx);
// attach transmit handler
i2c_slave_attach_transmit_handler(I2C1, &msg, functx);
// set addresss 1 to 16
i2c_slave_set_own_address(I2C1, 0x10);
// set addresss 2 to 32
i2c_slave_set_own_address2(I2C1, 0x20);
}
// Configure SERCOM channel 4 as I2C slave for VESC communication
void configure_i2c_slave(void)
{
/* Create and initialize config_i2c_slave structure */
struct i2c_slave_config config_i2c_slave;
i2c_slave_get_config_defaults(&config_i2c_slave);
/* Change address and address_mode */
config_i2c_slave.address = SLAVE_ADDRESS;
config_i2c_slave.address_mode = I2C_SLAVE_ADDRESS_MODE_MASK;
config_i2c_slave.buffer_timeout = SLAVE_TIMEOUT;
config_i2c_slave.pinmux_pad0 = PINMUX_PB08D_SERCOM4_PAD0;
config_i2c_slave.pinmux_pad1 = PINMUX_PB09D_SERCOM4_PAD1;
/* Initialize and enable device with config_i2c_slave */
i2c_slave_init(&i2c_slave_instance, SERCOM4, &config_i2c_slave);
i2c_slave_enable(&i2c_slave_instance);
}
//! [initialize_i2c]
void configure_i2c_slave(void)
{
/* Initialize config structure and module instance */
//! [init_conf]
struct i2c_slave_config config_i2c_slave;
i2c_slave_get_config_defaults(&config_i2c_slave);
//! [init_conf]
/* Change address and address_mode */
//! [conf_changes]
config_i2c_slave.address = SLAVE_ADDRESS;
config_i2c_slave.address_mode = I2C_SLAVE_ADDRESS_MODE_MASK;
//! [conf_changes]
/* Initialize and enable device with config */
//! [init_module]
i2c_slave_init(&i2c_slave_instance, CONF_I2C_SLAVE_MODULE, &config_i2c_slave);
//! [init_module]
//! [enable_module]
i2c_slave_enable(&i2c_slave_instance);
//! [enable_module]
}
//! [initialize_i2c]
void configure_i2c_slave(void)
{
/* Create and initialize config_i2c_slave structure */
//! [init_conf]
struct i2c_slave_config config_i2c_slave;
i2c_slave_get_config_defaults(&config_i2c_slave);
//! [init_conf]
/* Change address and address_mode */
//! [conf_changes]
config_i2c_slave.address = SLAVE_ADDRESS;
config_i2c_slave.address_mode = I2C_SLAVE_ADDRESS_MODE_MASK;
config_i2c_slave.buffer_timeout = 1000;
//! [conf_changes]
/* Initialize and enable device with config_i2c_slave */
//! [init_module]
i2c_slave_init(&i2c_slave_instance, SERCOM2, &config_i2c_slave);
//! [init_module]
//! [enable_module]
i2c_slave_enable(&i2c_slave_instance);
//! [enable_module]
}
int main(int argc, char ** argv)
{
int led = 0;
int ret;
int i;
DCC_LOG_INIT();
DCC_LOG_CONNECT();
/* calibrate usecond delay loop */
cm3_udelay_calibrate();
DCC_LOG(LOG_TRACE, "1. io_init()");
io_init();
DCC_LOG(LOG_TRACE, "2. leds_init()");
leds_init();
DCC_LOG(LOG_TRACE, "3. thinkos_init()");
thinkos_init(THINKOS_OPT_PRIORITY(0) | THINKOS_OPT_ID(32));
DCC_LOG(LOG_TRACE, "4. stdio_init()");
stdio_init();
printf("\n\n");
printf("-----------------------------------------\n");
printf(" I2C slave test\n");
printf("-----------------------------------------\n");
printf("\n");
for (i = 0; i < IO_MEM_SIZE; ++i)
io_mem[i] = i * 2;
i2c_slave_init(100000, 0x55, io_mem, IO_MEM_SIZE);
i2c_slave_enable();
for (i = 0; ; ++i) {
if ((i & 0xff) == 0) {
led = i % 5;
led_on(led);
}
ret = i2c_slave_io();
switch (ret) {
case I2C_XFER_IN:
printf("In ");
break;
case I2C_XFER_OUT:
printf("Out ");
break;
case I2C_XFER_ERR:
printf("Err ");
break;
}
led_off(led);
}
return 0;
}
