_RB_INLINE bool check_RX_done(int dev) {
unsigned long nowtime;
unsigned char statreg;
for (nowtime=0; nowtime<100000L; nowtime++) //trick for speed; timer_nowtime() is time-consuming in some OS
if (i2c_CheckRXRdy(dev) == true) goto RX_SUCCESS;
nowtime = timer_nowtime();
while ((i2c_CheckRXRdy(dev) == false) && ((timer_nowtime() - nowtime) < I2C_TIMEOUT));
RX_SUCCESS:
statreg = i2c_ReadStatREG(dev); //ugly code for speed:p
i2c_ClearRXRdy(dev);
if ((statreg & 0x08) != 0) //if (i2cmaster_CheckARLoss(dev) == true)
{
err_SetMsg(ERROR_I2CARLOSS, "arbitration loss for I2C bus");
i2cmaster_ClearARLoss(dev);
return false;
}
if ((statreg & 0x01) == 0) //if (i2c_IsMaster(dev) == false)
{
err_SetMsg(ERROR_I2CFAIL, "I2C%d module isn't in Master Mode", dev);
return false;
}
if ((statreg & 0x40) == 0) //if (i2c_CheckRXRdy(dev) == false)
{
err_SetMsg(ERROR_I2CFAIL, "I2C%d module doesn't respond", dev);
return false;
}
return true;
}
/******************** Slave Functions for Individual Module *****************/
RBAPI(unsigned) i2cslave_Listen(int dev) {
unsigned char i2cstat;
switch (I2C_action[dev])
{
case I2CACT_IDLE:
if (i2c_IsMaster(dev) == true) return I2CSLAVE_NOTHING;
I2C_action[dev] = I2CACT_SLAVE;
return I2CSLAVE_START;
case I2CACT_SLAVE:
i2cstat = i2c_ReadStatREG(dev);
if ((i2cstat & I2CSTAT_RXRDY) != 0)
{
I2C_action[dev] = I2CACT_SLAVEREADREQ;
return I2CSLAVE_READREQUEST;
}
if ((i2cstat & I2CSTAT_SLAVESTOPPED) != 0)
{
i2c_ClearSTAT(dev, I2CSTAT_ALL);
I2C_action[dev] = I2CACT_IDLE;
return I2CSLAVE_END;
}
if ((i2cstat & I2CSTAT_SLAVEWREQ) != 0)
{
I2C_action[dev] = I2CACT_SLAVEWRITEREQ;
return I2CSLAVE_WRITEREQUEST;
}
return I2CSLAVE_WAITING;
case I2CACT_SLAVEWRITEREQ:
case I2CACT_SLAVEREADREQ:
err_SetMsg(ERROR_I2CWRONGUSAGE, "must deal with the salve read/write request");
break;
case I2CACT_DISABLE:
err_SetMsg(ERROR_I2CWRONGUSAGE, "must enable the I2C module first");
break;
default:
err_SetMsg(ERROR_I2CWRONGUSAGE, "can't use %s() when I2C master is working", __FUNCTION__);
break;
}
return 0xffff;
}
DMP_INLINE(bool) check_TX_done(int dev) {
unsigned long nowtime;
unsigned char statreg;
for (nowtime=0; nowtime<100000L; nowtime++) //trick for speed; timer_NowTime() is time-consuming in some OS
if (i2c_CheckTXDone(dev) == true) goto TX_SUCCESS;
nowtime = timer_NowTime();
while ((i2c_CheckTXDone(dev) == false) && ((timer_NowTime() - nowtime) < I2C_TIMEOUT));
TX_SUCCESS:
statreg = i2c_ReadStatREG(dev); //ugly code for speed:p
i2c_ClearTXDone(dev);
if ((statreg & 0x08) != 0) //if (i2cmaster_CheckARLoss(dev) == true)
{
err_print("arbitration loss for I2C bus");
i2cmaster_ClearARLoss(dev);
}
if ((statreg & 0x10) != 0) //if (i2cmaster_CheckAckErr(dev) == true)
{
err_print("receive no ACK after transmitting");
i2cmaster_ClearAckErr(dev);
}
if ((statreg & (0x10 + 0x08)) != 0) return false;
if ((statreg & 0x01) == 0) //if (i2c_IsMaster(dev) == false)
{
err_print("I2C%d module isn't in Master Mode", dev);
return false;
}
if ((statreg & 0x20) == 0) //if (i2c_CheckTXDone(dev) == false)
{
err_print("I2C%d module doesn't respond", dev);
return false;
}
return true;
}
