lpc17xx_i2c.c

uCOSII_lwip_lpc1768

			}
			// no more data, switch to next stage
			else {
next_stage:
				// change direction
				i2cdat[tmp].dir = 1;
				// Check if any data to receive
				if ((txrx_setup->rx_length != 0) && (txrx_setup->rx_data != NULL)){
						// check whether if we need to issue an repeat start
						if ((txrx_setup->tx_length != 0) && (txrx_setup->tx_data != NULL)){
							// Send out an repeat start command
							I2Cx->I2CONSET = I2C_I2CONSET_STA;
							I2Cx->I2CONCLR = I2C_I2CONCLR_AAC | I2C_I2CONCLR_SIC;
						}
						// Don't need issue an repeat start, just goto send SLA+R
						else {
							goto send_slar;
						}
				}
				// no more data send, the go to end stage now
				else {
					// success, goto end stage
					txrx_setup->status |= I2C_SETUP_STATUS_DONE;
					goto end_stage;
				}
			}
			break;

		/* SLA+W has been transmitted, NACK has been received ----------------------*/
		case I2C_I2STAT_M_TX_SLAW_NACK:
		/* Data has been transmitted, NACK has been received -----------------------*/
		case I2C_I2STAT_M_TX_DAT_NACK:
			// update status
			txrx_setup->status |= I2C_SETUP_STATUS_NOACKF;
			goto retry;
		/* Arbitration lost in SLA+R/W or Data bytes -------------------------------*/
		case I2C_I2STAT_M_TX_ARB_LOST:
			// update status
			txrx_setup->status |= I2C_SETUP_STATUS_ARBF;
		default:
			goto retry;
		}
	}

	/* ----------------------------- RECEIVE PHASE --------------------------*/
	else if (i2cdat[tmp].dir == 1){
		switch (returnCode){
			/* A start/repeat start condition has been transmitted ---------------------*/
		case I2C_I2STAT_M_RX_START:
		case I2C_I2STAT_M_RX_RESTART:
			I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
			/*
			 * If there's any receive data, then start to
			 * send SLA+R right now, otherwise check whether if there's
			 * any receive data for end of state.
			 */
			if ((txrx_setup->rx_data != NULL) && (txrx_setup->rx_length != 0)){
send_slar:
				I2Cx->I2DAT = (txrx_setup->sl_addr7bit << 1) | 0x01;
				I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
			} else {
				// Success, goto end stage
				txrx_setup->status |= I2C_SETUP_STATUS_DONE;
				goto end_stage;
			}
			break;

		/* SLA+R has been transmitted, ACK has been received -----------------*/
		case I2C_I2STAT_M_RX_SLAR_ACK:
			if (txrx_setup->rx_count < (txrx_setup->rx_length - 1)) {
				/*Data will be received,  ACK will be return*/
				I2Cx->I2CONSET = I2C_I2CONSET_AA;
			}
			else {
				/*Last data will be received,  NACK will be return*/
				I2Cx->I2CONCLR = I2C_I2CONSET_AA;
			}
			I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
			break;

		/* Data has been received, ACK has been returned ----------------------*/
		case I2C_I2STAT_M_RX_DAT_ACK:
			// Note save data and increase counter first, then check later
			/* Save data  */
			if ((txrx_setup->rx_data != NULL) && (txrx_setup->rx_count < txrx_setup->rx_length)){
				*(uint8_t *)(txrx_setup->rx_data + txrx_setup->rx_count) = (I2Cx->I2DAT & I2C_I2DAT_BITMASK);
				txrx_setup->rx_count++;
			}
			if (txrx_setup->rx_count < (txrx_setup->rx_length - 1)) {
				/*Data will be received,  ACK will be return*/
				I2Cx->I2CONSET = I2C_I2CONSET_AA;
			}
			else {
				/*Last data will be received,  NACK will be return*/
				I2Cx->I2CONCLR = I2C_I2CONSET_AA;
			}

			I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
			break;

		/* Data has been received, NACK has been return -------------------------*/
		case I2C_I2STAT_M_RX_DAT_NACK:
			/* Save the last data */
			if ((txrx_setup->rx_data != NULL) && (txrx_setup->rx_count < txrx_setup->rx_length)){
				*(uint8_t *)(txrx_setup->rx_data + txrx_setup->rx_count) = (I2Cx->I2DAT & I2C_I2DAT_BITMASK);
				txrx_setup->rx_count++;
			}
			// success, go to end stage
			txrx_setup->status |= I2C_SETUP_STATUS_DONE;
			goto end_stage;

		/* SLA+R has been transmitted, NACK has been received ------------------*/
		case I2C_I2STAT_M_RX_SLAR_NACK:
			// update status
			txrx_setup->status |= I2C_SETUP_STATUS_NOACKF;
			goto retry;

		/* Arbitration lost ----------------------------------------------------*/
		case I2C_I2STAT_M_RX_ARB_LOST:
			// update status
			txrx_setup->status |= I2C_SETUP_STATUS_ARBF;
		default:
retry:
			// check if retransmission is available
			if (txrx_setup->retransmissions_count < txrx_setup->retransmissions_max){
				// Clear tx count
				txrx_setup->tx_count = 0;
				I2Cx->I2CONSET = I2C_I2CONSET_STA;
				I2Cx->I2CONCLR = I2C_I2CONCLR_AAC | I2C_I2CONCLR_SIC;
				txrx_setup->retransmissions_count++;
			}
			// End of stage
			else {
end_stage:
				// Disable interrupt
				I2C_IntCmd(I2Cx, 0);
				// Send stop
				I2C_Stop(I2Cx);

				I2C_MasterComplete[tmp] = TRUE;
			}
			break;
		}
	}
}


/*********************************************************************//**
 * @brief 		General Slave Interrupt handler for I2C peripheral
 * @param[in]	I2Cx	I2C peripheral selected, should be:
 *  			- LPC_I2C0
 *  			- LPC_I2C1
 *  			- LPC_I2C2
 * @return 		None
 **********************************************************************/
void I2C_SlaveHandler (LPC_I2C_TypeDef  *I2Cx)
{
	int32_t tmp;
	uint8_t returnCode;
	I2C_S_SETUP_Type *txrx_setup;
	uint32_t timeout;

	tmp = I2C_getNum(I2Cx);
	txrx_setup = (I2C_S_SETUP_Type *) i2cdat[tmp].txrx_setup;

	returnCode = (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
	// Save current status
	txrx_setup->status = returnCode;
	// there's no relevant information
	if (returnCode == I2C_I2STAT_NO_INF){
		I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
		return;
	}


	switch (returnCode)
	{

	/* No status information */
	case I2C_I2STAT_NO_INF:
		I2Cx->I2CONSET = I2C_I2CONSET_AA;
		I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
		break;

	/* Reading phase -------------------------------------------------------- */
	/* Own SLA+R has been received, ACK has been returned */
	case I2C_I2STAT_S_RX_SLAW_ACK:
	/* General call address has been received, ACK has been returned */
	case I2C_I2STAT_S_RX_GENCALL_ACK:
		I2Cx->I2CONSET = I2C_I2CONSET_AA;
		I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
		break;

	/* Previously addressed with own SLA;
	 * DATA byte has been received;
	 * ACK has been returned */
	case I2C_I2STAT_S_RX_PRE_SLA_DAT_ACK:
	/* DATA has been received, ACK hasn been return */
	case I2C_I2STAT_S_RX_PRE_GENCALL_DAT_ACK:
		/*
		 * All data bytes that over-flow the specified receive
		 * data length, just ignore them.
		 */
		if ((txrx_setup->rx_count < txrx_setup->rx_length) \
				&& (txrx_setup->rx_data != NULL)){
			*(uint8_t *)(txrx_setup->rx_data + txrx_setup->rx_count) = (uint8_t)I2Cx->I2DAT;
			txrx_setup->rx_count++;
		}
		I2Cx->I2CONSET = I2C_I2CONSET_AA;
		I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
		break;

	/* Previously addressed with own SLA;
	 * DATA byte has been received;
	 * NOT ACK has been returned */
	case I2C_I2STAT_S_RX_PRE_SLA_DAT_NACK:
	/* DATA has been received, NOT ACK has been returned */
	case I2C_I2STAT_S_RX_PRE_GENCALL_DAT_NACK:
		I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
		break;

	/*
	 * Note that: Return code only let us know a stop condition mixed
	 * with a repeat start condition in the same code value.
	 * So we should provide a time-out. In case this is really a stop
	 * condition, this will return back after time out condition. Otherwise,
	 * next session that is slave receive data will be completed.
	 */

	/* A Stop or a repeat start condition */
	case I2C_I2STAT_S_RX_STA_STO_SLVREC_SLVTRX:
		// Temporally lock the interrupt for timeout condition
		I2C_IntCmd(I2Cx, 0);
		I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
		// enable time out
		timeout = I2C_SLAVE_TIME_OUT;
		while(1){
			if (I2Cx->I2CONSET & I2C_I2CONSET_SI){
				// re-Enable interrupt
				I2C_IntCmd(I2Cx, 1);
				break;
			} else {
				timeout--;
				if (timeout == 0){
					// timeout occur, it's really a stop condition
					txrx_setup->status |= I2C_SETUP_STATUS_DONE;
					goto s_int_end;
				}
			}
		}
		break;

	/* Writing phase -------------------------------------------------------- */
	/* Own SLA+R has been received, ACK has been returned */
	case I2C_I2STAT_S_TX_SLAR_ACK:
	/* Data has been transmitted, ACK has been received */
	case I2C_I2STAT_S_TX_DAT_ACK:
		/*
		 * All data bytes that over-flow the specified receive
		 * data length, just ignore them.
		 */
		if ((txrx_setup->tx_count < txrx_setup->tx_length) \
				&& (txrx_setup->tx_data != NULL)){
			I2Cx->I2DAT = *(uint8_t *) (txrx_setup->tx_data + txrx_setup->tx_count);
			txrx_setup->tx_count++;
		}
		I2Cx->I2CONSET = I2C_I2CONSET_AA;
		I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
		break;

	/* Data has been transmitted, NACK has been received,
	 * that means there's no more data to send, exit now */
	/*
	 * Note: Don't wait for stop event since in slave transmit mode,
	 * since there no proof lets us know when a stop signal has been received
	 * on slave side.
	 */
	case I2C_I2STAT_S_TX_DAT_NACK:
		I2Cx->I2CONSET = I2C_I2CONSET_AA;
		I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
		txrx_setup->status |= I2C_SETUP_STATUS_DONE;
		goto s_int_end;

	// Other status must be captured
	default:
s_int_end:
		// Disable interrupt
		I2C_IntCmd(I2Cx, 0);
		I2Cx->I2CONCLR = I2C_I2CONCLR_AAC | I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC;
		I2C_SlaveComplete[tmp] = TRUE;
		break;
	}
}

/*********************************************************************//**
 * @brief 		Transmit and Receive data in master mode
 * @param[in]	I2Cx			I2C peripheral selected, should be:
 *  			- LPC_I2C0
 * 				- LPC_I2C1
 * 				- LPC_I2C2
 * @param[in]	TransferCfg		Pointer to a I2C_M_SETUP_Type structure that
 * 								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(LPC_I2C_TypeDef *I2Cx, I2C_M_SETUP_Type *TransferCfg, \
								I2C_TRANSFER_OPT_Type Opt)
{
	uint8_t *txdat;
	uint8_t *rxdat;
	uint32_t CodeStatus;
	uint8_t tmp;

	// reset all default state
	txdat = (uint8_t *) TransferCfg->tx_data;
	rxdat = (uint8_t *) TransferCfg->rx_data;
	// 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 all default state
		txdat = (uint8_t *) TransferCfg->tx_data;
		rxdat = (uint8_t *) TransferCfg->rx_data;
		// Reset I2C setup value to default state
		TransferCfg->tx_count = 0;
		TransferCfg->rx_count = 0;
		CodeStatus = 0;

		// Start command
		CodeStatus = I2C_Start(I2Cx);
		if ((CodeStatus != I2C_I2STAT_M_TX_START) \
				&& (CodeStatus != I2C_I2STAT_M_TX_RESTART)){
			TransferCfg->retransmissions_count++;
			if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
				// save status
				TransferCfg->status = CodeStatus;
				goto error;
			} else {
				goto retry;
			}
		}

		/* In case of sending data first --------------------------------------------------- */
		if ((TransferCfg->tx_length != 0) && (TransferCfg->tx_data != NULL)){

			/* Send slave address + WR direction bit = 0 ----------------------------------- */
			CodeStatus = I2C_SendByte(I2Cx, (TransferCfg->sl_addr7bit << 1));
			if (CodeStatus != I2C_I2STAT_M_TX_SLAW_ACK){
				TransferCfg->retransmissions_count++;
				if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
					// save status
					TransferCfg->status = CodeStatus | I2C_SETUP_STATUS_NOACKF;
					goto error;
				} else {
					goto retry;
				}
			}

			/* Send a number of data bytes ---------------------------------------- */
			while (TransferCfg->tx_count < TransferCfg->tx_length)
			{
				CodeStatus = I2C_SendByte(I2Cx, *txdat);
				if (CodeStatus != I2C_I2STAT_M_TX_DAT_ACK){
					TransferCfg->retransmissions_count++;
					if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
						// save status
						TransferCfg->status = CodeStatus | I2C_SETUP_STATUS_NOACKF;
						goto error;
					} else {
						goto retry;
					}
				}

				txdat++;
				TransferCfg->tx_count++;
			}
		}

		/* Second Start condition (Repeat Start) ------------------------------------------- */
		if ((TransferCfg->tx_length != 0) && (TransferCfg->tx_data != NULL) \
				&& (TransferCfg->rx_length != 0) && (TransferCfg->rx_data != NULL)){

			CodeStatus = I2C_Start(I2Cx);
			if ((CodeStatus != I2C_I2STAT_M_RX_START) \
					&& (CodeStatus != I2C_I2STAT_M_RX_RESTART)){
				TransferCfg->retransmissions_count++;
				if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
					// Update status
					TransferCfg->status = CodeStatus;
					goto error;
				} else {
					goto retry;
				}
			}
		}

		/* Then, start reading after sending data -------------------------------------- */
		if ((TransferCfg->rx_length != 0) && (TransferCfg->rx_data != NULL)){
			/* Send slave address + RD direction bit = 1 ----------------------------------- */

			CodeStatus = I2C_SendByte(I2Cx, ((TransferCfg->sl_addr7bit << 1) | 0x01));
			if (CodeStatus != I2C_I2STAT_M_RX_SLAR_ACK){
				TransferCfg->retransmissions_count++;
				if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
					// update status
					TransferCfg->status = CodeStatus | I2C_SETUP_STATUS_NOACKF;
					goto error;
				} else {
					goto retry;
				}
			}

			/* Receive a number of data bytes ------------------------------------------------- */
			while (TransferCfg->rx_count < TransferCfg->rx_length){

				/*
				 * Note that: if data length is only one, the master should not
				 * issue an ACK signal on bus after reading to avoid of next data frame
				 * on slave side
				 */
				if (TransferCfg->rx_count < (TransferCfg->rx_length - 1)){
					// Issue an ACK signal for next data frame
					CodeStatus = I2C_GetByte(I2Cx, &tmp, 1);
					if (CodeStatus != I2C_I2STAT_M_RX_DAT_ACK){
						TransferCfg->retransmissions_count++;
						if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
							// update status
							TransferCfg->status = CodeStatus;
							goto error;
						} else {
							goto retry;
						}
					}
				} else {
					// Do not issue an ACK signal
					CodeStatus = I2C_GetByte(I2Cx, &tmp, 0);
					if (CodeStatus != I2C_I2STAT_M_RX_DAT_NACK){
						TransferCfg->retransmissions_count++;
						if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
							// update status
							TransferCfg->status = CodeStatus;
							goto error;
						} else {
							goto retry;