lpc177x_8x_i2c.c

NXPl788上lwip的无操作系统移植,基于Embest开发板

 * 								contains specified information about the
 * 								configuration for master transfer.
 * @param[in]	Opt				a I2C_TRANSFER_OPT_Type type that selected for
 * 								interrupt or polling mode.
 * @return 		SUCCESS or ERROR
 *
 * Note:
 * - In case of using I2C to transmit data only, either transmit length set to 0
 * or transmit data pointer set to NULL.
 * - In case of using I2C to receive data only, either receive length set to 0
 * or receive data pointer set to NULL.
 * - In case of using I2C to transmit followed by receive data, transmit length,
 * transmit data pointer, receive length and receive data pointer should be set
 * corresponding.
 **********************************************************************/
Status I2C_MasterTransferData(en_I2C_unitId i2cId, I2C_M_SETUP_Type *TransferCfg,
																	I2C_TRANSFER_OPT_Type Opt)
{
	LPC_I2C_TypeDef* I2Cx = I2C_GetPointer(i2cId);

	uint32_t CodeStatus;
	int32_t Ret = I2C_OK;

	// Reset I2C setup value to default state
	TransferCfg->tx_count = 0;
	TransferCfg->rx_count = 0;
	TransferCfg->status = 0;

	if (Opt == I2C_TRANSFER_POLLING)
	{
		/* First Start condition -------------------------------------------------------------- */
		TransferCfg->retransmissions_count = 0;
retry:
		// Reset I2C setup value to default state
		TransferCfg->tx_count = 0;
		TransferCfg->rx_count = 0;

		// Start command
		CodeStatus = I2C_Start(I2Cx);
		
		while(1)	// send data first and then receive data from Slave.
		{
			Ret = I2C_MasterHanleStates(i2cId, CodeStatus, TransferCfg);
			if(I2C_CheckError(Ret))
			{
				TransferCfg->retransmissions_count++;
				if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
						// save status
						TransferCfg->status = CodeStatus | I2C_SETUP_STATUS_NOACKF;
						goto error;
					} else {
						goto retry;
					}
			}
			else if( (Ret & I2C_BYTE_SENT) ||
					(Ret & I2C_BYTE_RECV))
			{
				// Wait for sending ends/ Wait for next byte			
				while (!(I2Cx->CONSET & I2C_I2CONSET_SI));
			}
			else if (Ret & I2C_SEND_END) // already send all data
			{
				// If no need to wait for data from Slave
				if(TransferCfg->rx_count >= (TransferCfg->rx_length)) 
				{
					break;
				}
				else
				{
					I2C_Start(I2Cx);
				}
			}
			else if (Ret & I2C_RECV_END) // already receive all data
			{
				break;
			}
             		CodeStatus = I2Cx->STAT & I2C_STAT_CODE_BITMASK;
		}
		return SUCCESS;
error:
		return ERROR;
	}

	else if (Opt == I2C_TRANSFER_INTERRUPT)
	{
		// Setup tx_rx data, callback and interrupt handler
		i2cdat[i2cId].txrx_setup = (uint32_t) TransferCfg;

		// Set direction phase, write first
		i2cdat[i2cId].dir = 0;

		/* First Start condition -------------------------------------------------------------- */
		// Reset STA, STO, SI
		I2Cx->CONCLR = I2C_I2CONCLR_SIC|I2C_I2CONCLR_STOC|I2C_I2CONCLR_STAC;
		I2Cx->CONSET = I2C_I2CONSET_STA;

		I2C_IntCmd(i2cId, TRUE);

		return (SUCCESS);
	}

	return ERROR;
}

/*********************************************************************//**
 * @brief 		Receive and Transmit data in slave mode
 * @param[in]	I2Cx			I2C peripheral selected, should be
 *				- LPC_I2C0
 *				- LPC_I2C1
 *				- LPC_I2C2
 * @param[in]	TransferCfg		Pointer to a I2C_S_SETUP_Type structure that
 * 								contains specified information about the
 * 								configuration for master transfer.
 * @param[in]	Opt				I2C_TRANSFER_OPT_Type type that selected for
 * 								interrupt or polling mode.
 * @return 		SUCCESS or ERROR
 *
 * Note:
 * The mode of slave's operation depends on the command sent from master on
 * the I2C bus. If the master send a SLA+W command, this sub-routine will
 * use receive data length and receive data pointer. If the master send a SLA+R
 * command, this sub-routine will use transmit data length and transmit data
 * pointer.
 * If the master issue an repeat start command or a stop command, the slave will
 * enable an time out condition, during time out condition, if there's no activity
 * on I2C bus, the slave will exit, otherwise (i.e. the master send a SLA+R/W),
 * the slave then switch to relevant operation mode. The time out should be used
 * because the return status code can not show difference from stop and repeat
 * start command in slave operation.
 * In case of the expected data length from master is greater than data length
 * that slave can support:
 * - In case of reading operation (from master): slave will return I2C_I2DAT_IDLE_CHAR
 * value.
 * - In case of writing operation (from master): slave will ignore remain data from master.
 **********************************************************************/
Status I2C_SlaveTransferData(en_I2C_unitId i2cId, I2C_S_SETUP_Type *TransferCfg,
																	I2C_TRANSFER_OPT_Type Opt)
{
	LPC_I2C_TypeDef* I2Cx = I2C_GetPointer(i2cId);
	int32_t   Ret = I2C_OK;
	
	uint32_t CodeStatus;
	uint32_t timeout;
	int32_t time_en;
	
	// Reset I2C setup value to default state
	TransferCfg->tx_count = 0;
	TransferCfg->rx_count = 0;
	TransferCfg->status = 0;

	// Polling option
	if (Opt == I2C_TRANSFER_POLLING)
	{
		/* Set AA bit to ACK command on I2C bus */
		I2Cx->CONSET = I2C_I2CONSET_AA;
		
		/* Clear SI bit to be ready ... */
		I2Cx->CONCLR = (I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC|I2C_I2CONCLR_STOC);

		time_en = 0;
		timeout = 0;

		while (1)
		{
			/* Check SI flag ready */
			if (I2Cx->CONSET & I2C_I2CONSET_SI)
			{
				time_en = 0;

				CodeStatus = (I2Cx->STAT & I2C_STAT_CODE_BITMASK);

				Ret = I2C_SlaveHanleStates(i2cId, CodeStatus, TransferCfg);
				if(I2C_CheckError(Ret))
				{
					goto s_error;
				}
				else if(Ret & I2C_STA_STO_RECV)
				{
					time_en = 1;
					timeout = 0;
				}
                else if (Ret & I2C_SEND_END)
                {
                    goto s_end_stage;
                }
			}
			else if (time_en)
			{
				if (timeout++ > I2C_SLAVE_TIME_OUT)
				{
					// it's really a stop condition, goto end stage
					goto s_end_stage;
				}
			}
		}

s_end_stage:
		/* Clear AA bit to disable ACK on I2C bus */
		I2Cx->CONCLR = I2C_I2CONCLR_AAC;

		// Check if there's no error during operation
		// Update status
		TransferCfg->status = CodeStatus | I2C_SETUP_STATUS_DONE;
		return SUCCESS;

s_error:
		/* Clear AA bit to disable ACK on I2C bus */
		I2Cx->CONCLR = I2C_I2CONCLR_AAC;

		// Update status
		TransferCfg->status = CodeStatus;
		return ERROR;
	}

	else if (Opt == I2C_TRANSFER_INTERRUPT)
	{
		// Setup tx_rx data, callback and interrupt handler
		i2cdat[i2cId].txrx_setup = (uint32_t) TransferCfg;

		// Set direction phase, read first
		i2cdat[i2cId].dir = 1;

		// Enable AA
		I2Cx->CONSET = I2C_I2CONSET_AA;
		I2Cx->CONCLR = I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC;
		I2C_IntCmd(i2cId, TRUE);

		return (SUCCESS);
	}

	return ERROR;
}

/*********************************************************************//**
 * @brief		Set Own slave address in I2C peripheral corresponding to
 * 				parameter specified in OwnSlaveAddrConfigStruct.
 * @param[in]	I2Cx	I2C peripheral selected, should be
 *				- LPC_I2C0
 *				- LPC_I2C1
 *				- LPC_I2C2
 * @param[in]	OwnSlaveAddrConfigStruct	Pointer to a I2C_OWNSLAVEADDR_CFG_Type
 * 				structure that contains the configuration information for the
*               specified I2C slave address.
 * @return 		None
 **********************************************************************/
void I2C_SetOwnSlaveAddr(en_I2C_unitId i2cId, I2C_OWNSLAVEADDR_CFG_Type *OwnSlaveAddrConfigStruct)
{
	LPC_I2C_TypeDef* I2Cx = I2C_GetPointer(i2cId);

	uint32_t tmp;

	tmp = (((uint32_t)(OwnSlaveAddrConfigStruct->SlaveAddr_7bit << 1)) \
			| ((OwnSlaveAddrConfigStruct->GeneralCallState == ENABLE) ? 0x01 : 0x00))& I2C_I2ADR_BITMASK;

	switch (OwnSlaveAddrConfigStruct->SlaveAddrChannel)
	{
		case 0:
			I2Cx->ADR0 = tmp;

			I2Cx->MASK0 = I2C_I2MASK_MASK((uint32_t) \
							(OwnSlaveAddrConfigStruct->SlaveAddrMaskValue));
			break;

		case 1:
			I2Cx->ADR1 = tmp;

			I2Cx->MASK1 = I2C_I2MASK_MASK((uint32_t) \
							(OwnSlaveAddrConfigStruct->SlaveAddrMaskValue));
			break;

		case 2:
			I2Cx->ADR2 = tmp;

			I2Cx->MASK2 = I2C_I2MASK_MASK((uint32_t) \
							(OwnSlaveAddrConfigStruct->SlaveAddrMaskValue));
			break;

		case 3:
			I2Cx->ADR3 = tmp;

			I2Cx->MASK3 = I2C_I2MASK_MASK((uint32_t) \
							(OwnSlaveAddrConfigStruct->SlaveAddrMaskValue));
			break;
	}
}


/*********************************************************************//**
 * @brief		Configures functionality in I2C monitor mode
 * @param[in]	I2Cx	I2C peripheral selected, should be
 *				- LPC_I2C0
 *				- LPC_I2C1
 *				- LPC_I2C2
 * @param[in]	Monitor configuration. It can include:
 * 				- I2C_I2MMCTRL_ENA_SCL: I2C module can 'stretch'
 * 				the clock line (hold it low) until it has had time to
 * 				respond to an I2C interrupt.
 * 				- I2C_I2MMCTRL_MATCH_ALL: When the I2C is in monitor mode, 
 *				an interrupt will be generated on ANY address received.
 * @param[in]	NewState New State of this function, should be:
 * 				- ENABLE: Enable this function.
 * 				- DISABLE: Disable this function.
 * @return		None
 **********************************************************************/
void I2C_MonitorModeConfig(en_I2C_unitId i2cId, uint32_t MonitorCfgType, FunctionalState NewState)
{
	LPC_I2C_TypeDef* I2Cx = I2C_GetPointer(i2cId);

	if (NewState == ENABLE)
	{
		I2Cx->MMCTRL |= MonitorCfgType;
	}
	else
	{
		I2Cx->MMCTRL &= (~MonitorCfgType) & I2C_I2MMCTRL_BITMASK;
	}
}


/*********************************************************************//**
 * @brief		Enable/Disable I2C monitor mode
 * @param[in]	I2Cx	I2C peripheral selected, should be
 *				- LPC_I2C0
 *				- LPC_I2C1
 *				- LPC_I2C2
 * @param[in]	NewState New State of this function, should be:
 * 				- ENABLE: Enable monitor mode.
 * 				- DISABLE: Disable monitor mode.
 * @return		None
 **********************************************************************/
void I2C_MonitorModeCmd(en_I2C_unitId i2cId, FunctionalState NewState)
{
	LPC_I2C_TypeDef* I2Cx = I2C_GetPointer(i2cId);

	if (NewState == ENABLE)
	{
		I2Cx->MMCTRL |= I2C_I2MMCTRL_MM_ENA;
		I2Cx->CONSET = I2C_I2CONSET_AA;
		I2Cx->CONCLR = I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC;
	}
	else
	{
		I2Cx->MMCTRL &= (~I2C_I2MMCTRL_MM_ENA) & I2C_I2MMCTRL_BITMASK;
		I2Cx->CONCLR = I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC | I2C_I2CONCLR_AAC;
	}

	I2C_MonitorBufferIndex = 0;
}


/*********************************************************************//**
 * @brief		Get data from I2C data buffer in monitor mode.
 * @param[in]	I2Cx	I2C peripheral selected, should be
 *				- LPC_I2C0
 *				- LPC_I2C1
 *				- LPC_I2C2
 * @return		None
 * Note:	In monitor mode, the I2C module may lose the ability to stretch
 * the clock (stall the bus) if the ENA_SCL bit is not set. This means that
 * the processor will have a limited amount of time to read the contents of
 * the data received on the bus. If the processor reads the DAT shift
 * register, as it ordinarily would, it could have only one bit-time to
 * respond to the interrupt before the received data is overwritten by
 * new data.
 **********************************************************************/
uint8_t I2C_MonitorGetDatabuffer(en_I2C_unitId i2cId)
{
	LPC_I2C_TypeDef* I2Cx = I2C_GetPointer(i2cId);

	return ((uint8_t)(I2Cx->DATA_BUFFER));
}

/*********************************************************************//**
 * @brief		Get data from I2C data buffer in monitor mode.
 * @param[in]	I2Cx	I2C peripheral selected, should be
 *				- LPC_I2C0
 *				- LPC_I2C1
 *				- LPC_I2C2
 * @return		None
 * Note:	In monitor mode, the I2C module may lose the ability to stretch
 * the clock (stall the bus) if the ENA_SCL bit is not set. This means that
 * the processor will have a limited amount of time to read the contents of
 * the data received on the bus. If the processor reads the DAT shift
 * register, as it ordinarily would, it could have only one bit-time to
 * respond to the interrupt before the received data is overwritten by
 * new data.
 **********************************************************************/
BOOL_8 I2C_MonitorHandler(en_I2C_unitId i2cId, uint8_t *buffer, uint32_t size)
{
	LPC_I2C_TypeDef* I2Cx = I2C_GetPointer(i2cId);

	BOOL_8 ret=FALSE;

	I2Cx->CONCLR = I2C_I2CONCLR_SIC;

	buffer[I2C_MonitorBufferIndex] = (uint8_t)(I2Cx->DATA_BUFFER);

	I2C_MonitorBufferIndex++;

	if(I2C_MonitorBufferIndex >= size)
	{
		ret = TRUE;
	}
	return ret;
}
/*********************************************************************//**
 * @brief 		Get status of Master Transfer
 * @param[in]	I2Cx	I2C peripheral selected, should be:
 *				- LPC_I2C0
 *				- LPC_I2C1
 *				- LPC_I2C2
 * @return 		Master transfer status, could be:
 * 				- TRUE	master transfer completed
 * 				- FALSE master transfer have not completed yet
 **********************************************************************/
uint32_t I2C_MasterTransferComplete(en_I2C_unitId i2cId)
{
	uint32_t retval;

	retval = I2C_MasterComplete[i2cId];

	I2C_MasterComplete[i2cId] = FALSE;

	return retval;
}

/*********************************************************************//**
 * @brief 		Get status of Slave Transfer
 * @param[in]	I2Cx	I2C peripheral selected, should be:
 *				- LPC_I2C0
 *				- LPC_I2C1
 *				- LPC_I2C2
 * @return 		Complete status, could be: TRUE/FALSE
 **********************************************************************/
uint32_t I2C_SlaveTransferComplete(en_I2C_unitId i2cId)
{
	uint32_t retval;

	retval = I2C_SlaveComplete[i2cId];

	I2C_SlaveComplete[i2cId] = FALSE;

	return retval;
}

#endif /*_I2C*/

/**
 * @}
 */


/**
 * @}
 */

/* --------------------------------- End Of File ------------------------------ */