99 lines
3.5 KiB
C
99 lines
3.5 KiB
C
/*
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* @brief LPC15xx I2C slave driver
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2014
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* All rights reserved.
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*
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* @par
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* LPC products. This software is supplied "AS IS" without any warranties of
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* any kind, and NXP Semiconductors and its licensor disclaim any and
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* all warranties, express or implied, including all implied warranties of
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* merchantability, fitness for a particular purpose and non-infringement of
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* intellectual property rights. NXP Semiconductors assumes no responsibility
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* or liability for the use of the software, conveys no license or rights under any
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* patent, copyright, mask work right, or any other intellectual property rights in
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* or to any products. NXP Semiconductors reserves the right to make changes
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* in the software without notification. NXP Semiconductors also makes no
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* representation or warranty that such application will be suitable for the
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* specified use without further testing or modification.
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*
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* @par
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors' and its
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* licensor's relevant copyrights in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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*/
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#include "chip.h"
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/*****************************************************************************
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* Private types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Public types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Private functions
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****************************************************************************/
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/*****************************************************************************
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* Public functions
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****************************************************************************/
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/* Slave transfer state change handler */
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uint32_t Chip_I2CS_XferHandler(LPC_I2C_T *pI2C, const I2CS_XFER_T *xfers)
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{
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uint32_t done = 0;
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uint8_t data;
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uint32_t state;
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/* transfer complete? */
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if ((Chip_I2C_GetPendingInt(pI2C) & I2C_INTENSET_SLVDESEL) != 0) {
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Chip_I2CS_ClearStatus(pI2C, I2C_STAT_SLVDESEL);
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xfers->slaveDone();
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}
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else {
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/* Determine the current I2C slave state */
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state = Chip_I2CS_GetSlaveState(pI2C);
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switch (state) {
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case I2C_STAT_SLVCODE_ADDR: /* Slave address received */
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/* Get slave address that needs servicing */
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data = Chip_I2CS_GetSlaveAddr(pI2C, Chip_I2CS_GetSlaveMatchIndex(pI2C));
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/* Call address callback */
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xfers->slaveStart(data);
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break;
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case I2C_STAT_SLVCODE_RX: /* Data byte received */
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/* Get received data */
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data = Chip_I2CS_ReadByte(pI2C);
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done = xfers->slaveRecv(data);
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break;
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case I2C_STAT_SLVCODE_TX: /* Get byte that needs to be sent */
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/* Get data to send */
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done = xfers->slaveSend(&data);
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Chip_I2CS_WriteByte(pI2C, data);
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break;
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}
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}
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if (done == 0) {
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Chip_I2CS_SlaveContinue(pI2C);
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}
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else {
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Chip_I2CS_SlaveNACK(pI2C);
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}
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return done;
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}
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