/* Slave transfer state change handler */
uint32_t Chip_I2CS_XferHandler(LPC_I2C_T *pI2C, const I2CS_XFER_T *xfers)
{
uint32_t done = 0, xferDone = 0;
uint8_t data;
uint32_t state;
/* Transfer complete? */
if ((Chip_I2C_GetPendingInt(pI2C) & I2C_INTENSET_SLVDESEL) != 0) {
Chip_I2CS_ClearStatus(pI2C, I2C_STAT_SLVDESEL);
xfers->slaveDone();
xferDone = 1;
}
else {
/* Determine the current I2C slave state */
state = Chip_I2CS_GetSlaveState(pI2C);
switch (state) {
case I2C_STAT_SLVCODE_ADDR: /* Slave address received */
/* Get slave address that needs servicing */
data = Chip_I2CS_GetSlaveAddr(pI2C, Chip_I2CS_GetSlaveMatchIndex(pI2C));
/* Call address callback */
xfers->slaveStart(data);
break;
case I2C_STAT_SLVCODE_RX: /* Data byte received, not used with DMA */
/* Get received data */
data = Chip_I2CS_ReadByte(pI2C);
done = xfers->slaveRecv(data);
break;
case I2C_STAT_SLVCODE_TX: /* Get byte that needs to be sent, or start DMA */
/* Get data to send */
done = xfers->slaveSend(&data);
if (!((done == I2C_SLVCTL_SLVNACK) || (done == I2C_SLVCTL_SLVDMA))) {
Chip_I2CS_WriteByte(pI2C, data);
}
break;
}
}
if (done == I2C_SLVCTL_SLVNACK) {
Chip_I2CS_SlaveNACK(pI2C);
done = 1;
}
else if (done == I2C_SLVCTL_SLVDMA) {
Chip_I2CS_SlaveEnableDMA(pI2C);
}
else {
Chip_I2CS_SlaveContinue(pI2C);
}
return xferDone;
}
/**
* @brief Main routine for I2C example
* @return Function should not exit
*/
void i2C_slave_Task (void *pvParameters)
{
uint8_t i;
/* Test I2c slave */
while (1) {
// DEBUGOUT(" matched @: %u\r\n",Chip_I2C_GetPendingInt(LPC_I2C0));
i = Chip_I2CS_ReadByte(LPC_I2C0);
xSemaphoreTake( xI2cSemaphore, portMAX_DELAY );
// DEBUGOUT(" read value: 0x%x\r\n",i);
DEBUGOUT(" I2C transaction complete\r\n");
}
}