RBAPI(unsigned) i2cmaster_ReadLast(int dev) {
unsigned val;
switch (I2C_action[dev])
{
case I2CACT_MASTERREAD:
if (I2C_swMode[dev] == I2CSW_DISABLE)
{
if (I2C_rsInfo[dev].restart == true)
{
i2cmaster_WriteAddrREG(dev, I2C_rsInfo[dev].addr, I2C_rsInfo[dev].rwbit);
delay_us(150L); //Remarks: must delay here due to DX's I2C H/W bug
}
else
i2cmaster_SetStopBit(dev);
}
break;
case I2CACT_MASTERHASREAD:
err_SetMsg(ERROR_I2CWRONGUSAGE, "set Second-Last-Read before calling %s()", __FUNCTION__);
return 0xffff;
case I2CACT_MASTERLASTREAD:
I2C_action[dev] = I2CACT_MASTERHASREAD; // for calling i2cmaster_Read1() again to get the last byte
break;
}
val = (I2C_swMode[dev] != I2CSW_DISABLE)? i2csw_Read(dev, true) : i2cmaster_Read1(dev, false);
I2C_action[dev] = I2CACT_IDLE;
if (val == 0xffff) return 0xffff;
if (I2C_rsInfo[dev].restart == true)
{
I2C_rsInfo[dev].restart = false;
if (I2C_swMode[dev] != I2CSW_DISABLE)
{
if (i2csw_Start(dev, I2C_rsInfo[dev].addr, I2C_rsInfo[dev].rwbit, true) == false) return 0xffff;
}
else
{
if (check_TX_done(dev) == false) return 0xffff;
}
I2C_action[dev] = (I2C_rsInfo[dev].rwbit == I2C_WRITE)? I2CACT_MASTERWRITE : I2CACT_MASTERREAD;
I2C_count[dev] = I2C_rsInfo[dev].count;
}
else
{
if (I2C_swMode[dev] != I2CSW_DISABLE)
i2csw_Stop(dev);
else
{
if (check_STOP_done(dev) == false) return 0xffff;
}
}//end if I2C_restart...
return val;
}
_RB_INLINE bool i2cmaster_Start1(int dev, unsigned char addr, unsigned char rwbit) {
if (i2c_IsMaster(dev) == false)
{
err_SetMsg(ERROR_I2CWRONGUSAGE, "can't start a transaction in Slave state");
return false;
}
i2cmaster_WriteAddrREG(dev, addr, rwbit);
//Remarks: if I2C master sends "Start" twice sequently, ARLoss will occur according to H/W design
return check_TX_done(dev);
}
_RB_INLINE bool i2cmaster_Start1(int dev, unsigned char addr, unsigned char rwbit) {
if (i2c_IsMaster(dev) == false)
{
err_SetMsg(ERROR_I2CWRONGUSAGE, "can't start a transaction in Slave state");
return false;
}
i2cmaster_WriteAddrREG(dev, addr, rwbit);
//Remarks: if I2C master sends "Start" twice sequently, ARLoss will occur according to H/W design
if (check_TX_done(dev) == false) return false;
I2C_action[dev] = (rwbit == I2C_WRITE)? I2CACT_MASTERWRITE : I2CACT_MASTERREAD;
I2C_curAddr = addr;
return true;
}
//Remarks: the following "Read" functions are odd due to Vortex86DX's poor I2C design
RBAPI(unsigned) i2cmaster_Read1(int dev, bool secondlast) {
switch (I2C_action[dev])
{
case I2CACT_MASTERREAD:
if (I2C_swMode[dev] == I2CSW_DISABLE) i2c_ReadDataREG(dev); // dummy read to trigger the I2C module for reading a byte
I2C_action[dev] = I2CACT_MASTERHASREAD;
break;
case I2CACT_MASTERHASREAD:
break;
case I2CACT_MASTERLASTREAD:
err_SetMsg(ERROR_I2CWRONGUSAGE, "call i2cmaster_ReadLast() to read the last byte");
return 0xffff;
default:
err_SetMsg(ERROR_I2CWRONGUSAGE, "must start a correct transaction before reading data");
return 0xffff;
}
if (I2C_swMode[dev] == I2CSW_DISABLE)
{
if (check_RX_done(dev) == false)
{
I2C_action[dev] = I2CACT_IDLE;
return 0xffff;
}
if (secondlast == true)
{
if (I2C_rsInfo[dev].restart == true)
{
i2cmaster_WriteAddrREG(dev, I2C_rsInfo[dev].addr, I2C_rsInfo[dev].rwbit);
delay_us(150L); //Remarks: must delay here due to DX's I2C H/W bug
}
else
i2cmaster_SetStopBit(dev);
}
} //end if (I2C_swMode[dev] ...
if (secondlast == true) I2C_action[dev] = I2CACT_MASTERLASTREAD;
if (I2C_swMode[dev] != I2CSW_DISABLE)
return i2csw_Read(dev, false);
else
return (unsigned)i2c_ReadDataREG(dev); //Remarks: this read will trigger I2C module to read the next byte
}
RBAPI(unsigned) i2cmaster_ReadLast(int dev) {
unsigned val;
switch (I2C_action[dev])
{
case I2CACT_MASTERREAD:
if (I2C_rsInfo[dev].restart == true)
{
i2cmaster_WriteAddrREG(dev, I2C_rsInfo[dev].addr, I2C_rsInfo[dev].rwbit);
delay_ms(1); //Remarks: must delay here due to DX's I2C H/W bug
}
else
i2cmaster_SetStopBit(dev);
break;
case I2CACT_MASTERHASREAD:
err_SetMsg(ERROR_I2CWRONGUSAGE, "set Second-Last-Read before calling %s()", __FUNCTION__);
return 0xffff;
case I2CACT_MASTERLASTREAD:
I2C_action[dev] = I2CACT_MASTERHASREAD;
break;
}
if ((val = i2cmaster_Read1(dev, false)) == 0xffff) return 0xffff; else I2C_action[dev] = I2CACT_IDLE;
if (I2C_rsInfo[dev].restart == true)
{
I2C_rsInfo[dev].restart = false;
if (check_TX_done(dev) == false) return 0xffff;
I2C_count = I2C_rsInfo[dev].count;
I2C_action[dev] = (I2C_rsInfo[dev].rwbit == I2C_WRITE)? I2CACT_MASTERWRITE : I2CACT_MASTERREAD;
}
else
{
if (check_STOP_done(dev) == false) return 0xffff;
}//end if I2C_restart...
return val;
}
