lpc11xx_ssp.c

基于MDK的LPC1100处理器开发应用例程

	}
	else
	{
		SSPx->CR1 &= (~SSP_CR1_SSP_EN) & SSP_CR1_BITMASK;
	}
}



/*********************************************************************//**
 * @brief		Enable or disable Loop Back mode function in SSP peripheral
 * @param[in]	SSPx	SSP peripheral selected, should be SSP0 or SSP1
 * @param[in]	NewState	New State of Loop Back mode, should be:
 * 							- ENABLE: Enable this function
 * 							- DISABLE: Disable this function
 * @return 		None
 **********************************************************************/
void SSP_LoopBackCmd(SSP_TypeDef* SSPx, FunctionalState NewState)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));
	CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));

	if (NewState == ENABLE)
	{
		SSPx->CR1 |= SSP_CR1_LBM_EN;
	}
	else
	{
		SSPx->CR1 &= (~SSP_CR1_LBM_EN) & SSP_CR1_BITMASK;
	}
}



/*********************************************************************//**
 * @brief		Enable or disable Slave Output function in SSP peripheral
 * @param[in]	SSPx	SSP peripheral selected, should be SSP0 or SSP1
 * @param[in]	NewState	New State of Slave Output function, should be:
 * 							- ENABLE: Slave Output in normal operation
 * 							- DISABLE: Slave Output is disabled. This blocks
 * 							SSP controller from driving the transmit data
 * 							line (MISO)
 * Note: 		This function is available when SSP peripheral in Slave mode
 * @return 		None
 **********************************************************************/
void SSP_SlaveOutputCmd(SSP_TypeDef* SSPx, FunctionalState NewState)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));
	CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));

	if (NewState == ENABLE)
	{
		SSPx->CR1 &= (~SSP_CR1_SO_DISABLE) & SSP_CR1_BITMASK;
	}
	else
	{
		SSPx->CR1 |= SSP_CR1_SO_DISABLE;
	}
}



/*********************************************************************//**
 * @brief		Transmit a single data through SSPx peripheral
 * @param[in]	SSPx	SSP peripheral selected, should be SSP
 * @param[in]	Data	Data to transmit (must be 16 or 8-bit long,
 * 						this depend on SSP data bit number configured)
 * @return 		none
 **********************************************************************/
void SSP_SendData(SSP_TypeDef* SSPx, uint16_t Data)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));

	SSPx->DR = SSP_DR_BITMASK(Data);
}



/*********************************************************************//**
 * @brief		Receive a single data from SSPx peripheral
 * @param[in]	SSPx	SSP peripheral selected, should be SSP
 * @return 		Data received (16-bit long)
 **********************************************************************/
uint16_t SSP_ReceiveData(SSP_TypeDef* SSPx)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));

	return ((uint16_t) (SSP_DR_BITMASK(SSPx->DR)));
}

/*********************************************************************//**
 * @brief 		SSP Read write data function
 * @param[in]	SSPx 	Pointer to SSP peripheral, should be SSP0 or SSP1
 * @param[in]	dataCfg	Pointer to a SSP_DATA_SETUP_Type structure that
 * 						contains specified information about transmit
 * 						data configuration.
 * @param[in]	xfType	Transfer type, should be:
 * 						- SSP_TRANSFER_POLLING: Polling mode
 * 						- SSP_TRANSFER_INTERRUPT: Interrupt mode
 * @return 		Actual Data length has been transferred in polling mode.
 * 				In interrupt mode, always return (0)
 * 				Return (-1) if error.
 * Note: This function can be used in both master and slave mode.
 ***********************************************************************/
int32_t SSP_ReadWrite (SSP_TypeDef *SSPx, SSP_DATA_SETUP_Type *dataCfg, \
						SSP_TRANSFER_Type xfType)
{
	uint8_t *rdata8;
    uint8_t *wdata8;
	uint16_t *rdata16;
    uint16_t *wdata16;
    uint32_t stat;
    uint32_t tmp;
    int32_t sspnum;
    int32_t dataword;

    dataCfg->rx_cnt = 0;
    dataCfg->tx_cnt = 0;
    dataCfg->status = 0;


	/* Clear all remaining data in RX FIFO */
	while (SSPx->SR & SSP_SR_RNE){
		tmp = (uint32_t) SSP_ReceiveData(SSPx);
	}

	// Clear status
	SSPx->ICR = SSP_ICR_BITMASK;

	sspnum = SSP_getNum(SSPx);
	dataword = sspdat[sspnum].dataword;

	// Polling mode ----------------------------------------------------------------------
	if (xfType == SSP_TRANSFER_POLLING){
		if (dataword == 0){
			rdata8 = (uint8_t *)dataCfg->rx_data;
			wdata8 = (uint8_t *)dataCfg->tx_data;
		} else {
			rdata16 = (uint16_t *)dataCfg->rx_data;
			wdata16 = (uint16_t *)dataCfg->tx_data;
		}
		while ((dataCfg->tx_cnt != dataCfg->length) || (dataCfg->rx_cnt != dataCfg->length)){
			if ((SSPx->SR & SSP_SR_TNF) && (dataCfg->tx_cnt != dataCfg->length)){
				// Write data to buffer
				if(dataCfg->tx_data == NULL){
					if (dataword == 0){
						SSP_SendData(SSPx, 0xFF);
						dataCfg->tx_cnt++;
					} else {
						SSP_SendData(SSPx, 0xFFFF);
						dataCfg->tx_cnt += 2;
					}
				} else {
					if (dataword == 0){
						SSP_SendData(SSPx, *wdata8);
						wdata8++;
						dataCfg->tx_cnt++;
					} else {
						SSP_SendData(SSPx, *wdata16);
						wdata16++;
						dataCfg->tx_cnt += 2;
					}
				}
			}

			// Check overrun error
			if ((stat = SSPx->RIS) & SSP_RIS_ROR){
				// save status and return
				dataCfg->status = stat | SSP_STAT_ERROR;
				return (-1);
			}

			// Check for any data available in RX FIFO
			while ((SSPx->SR & SSP_SR_RNE) && (dataCfg->rx_cnt != dataCfg->length)){
				// Read data from SSP data
				tmp = SSP_ReceiveData(SSPx);

				// Store data to destination
				if (dataCfg->rx_data != NULL)
				{
					if (dataword == 0){
						*(rdata8) = (uint8_t) tmp;
						rdata8++;
					} else {
						*(rdata16) = (uint16_t) tmp;
						rdata16++;
					}
				}
				// Increase counter
				if (dataword == 0){
					dataCfg->rx_cnt++;
				} else {
					dataCfg->rx_cnt += 2;
				}
			}
		}

		// save status
		dataCfg->status = SSP_STAT_DONE;

		if (dataCfg->tx_data != NULL){
			return dataCfg->tx_cnt;
		} else if (dataCfg->rx_data != NULL){
			return dataCfg->rx_cnt;
		} else {
			return (0);
		}
	}

	// Interrupt mode ----------------------------------------------------------------------
	else if (xfType == SSP_TRANSFER_INTERRUPT){
		sspdat[sspnum].inthandler = SSP_IntHandler;
		sspdat[sspnum].txrx_setup = (uint32_t)dataCfg;

		while ((SSPx->SR & SSP_SR_TNF) && (dataCfg->tx_cnt != dataCfg->length)){
			// Write data to buffer
			if(dataCfg->tx_data == NULL){
				if (sspdat[sspnum].dataword == 0){
					SSP_SendData(SSPx, 0xFF);
					dataCfg->tx_cnt++;
				} else {
					SSP_SendData(SSPx, 0xFFFF);
					dataCfg->tx_cnt += 2;
				}
			} else {
				if (sspdat[sspnum].dataword == 0){
					SSP_SendData(SSPx, (*(uint8_t *)((uint32_t)dataCfg->tx_data + dataCfg->tx_cnt)));
					dataCfg->tx_cnt++;
				} else {
					SSP_SendData(SSPx, (*(uint16_t *)((uint32_t)dataCfg->tx_data + dataCfg->tx_cnt)));
					dataCfg->tx_cnt += 2;
				}
			}

			// Check error
			if ((stat = SSPx->RIS) & SSP_RIS_ROR){
				// save status and return
				dataCfg->status = stat | SSP_STAT_ERROR;
				return (-1);
			}

			// Check for any data available in RX FIFO
			while ((SSPx->SR & SSP_SR_RNE) && (dataCfg->rx_cnt != dataCfg->length)){
				// Read data from SSP data
				tmp = SSP_ReceiveData(SSPx);

				// Store data to destination
				if (dataCfg->rx_data != NULL)
				{
					if (sspdat[sspnum].dataword == 0){
						*(uint8_t *)((uint32_t)dataCfg->rx_data + dataCfg->rx_cnt) = (uint8_t) tmp;
					} else {
						*(uint16_t *)((uint32_t)dataCfg->rx_data + dataCfg->rx_cnt) = (uint16_t) tmp;
					}
				}
				// Increase counter
				if (sspdat[sspnum].dataword == 0){
					dataCfg->rx_cnt++;
				} else {
					dataCfg->rx_cnt += 2;
				}
			}
		}

		// If there more data to sent or receive
		if ((dataCfg->rx_cnt != dataCfg->length) || (dataCfg->tx_cnt != dataCfg->length)){
			// Enable all interrupt
			SSPx->IMSC = SSP_IMSC_BITMASK;
		} else {
			// Save status
			dataCfg->status = SSP_STAT_DONE;
		}
		return (0);
	}

	return (-1);
}

/*********************************************************************//**
 * @brief		Checks whether the specified SSP status flag is set or not
 * @param[in]	SSPx	SSP peripheral selected, should be SSP0 or SSP1
 * @param[in]	FlagType	Type of flag to check status, should be one
 * 							of following:
 *							- SSP_STAT_TXFIFO_EMPTY: TX FIFO is empty
 *							- SSP_STAT_TXFIFO_NOTFULL: TX FIFO is not full
 *							- SSP_STAT_RXFIFO_NOTEMPTY: RX FIFO is not empty
 *							- SSP_STAT_RXFIFO_FULL: RX FIFO is full
 *							- SSP_STAT_BUSY: SSP peripheral is busy
 * @return		New State of specified SSP status flag
 **********************************************************************/
FlagStatus SSP_GetStatus(SSP_TypeDef* SSPx, uint32_t FlagType)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));
	CHECK_PARAM(PARAM_SSP_STAT(FlagType));

	return ((SSPx->SR & FlagType) ? SET : RESET);
}



/*********************************************************************//**
 * @brief		Enable or disable specified interrupt type in SSP peripheral
 * @param[in]	SSPx	SSP peripheral selected, should be SSP0 or SSP1
 * @param[in]	IntType	Interrupt type in SSP peripheral, should be:
 * 				- SSP_INTCFG_ROR: Receive Overrun interrupt
 * 				- SSP_INTCFG_RT: Receive Time out interrupt
 * 				- SSP_INTCFG_RX: RX FIFO is at least half full interrupt
 * 				- SSP_INTCFG_TX: TX FIFO is at least half empty interrupt
 * @param[in]	NewState New State of specified interrupt type, should be:
 * 				- ENABLE: Enable this interrupt type
 * 				- DISABLE: Disable this interrupt type
 * @return		None
 **********************************************************************/
void SSP_IntConfig(SSP_TypeDef *SSPx, uint32_t IntType, FunctionalState NewState)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));
	CHECK_PARAM(PARAM_SSP_INTCFG(IntType));

	if (NewState == ENABLE)
	{
		SSPx->IMSC |= IntType;
	}
	else
	{
		SSPx->IMSC &= (~IntType) & SSP_IMSC_BITMASK;
	}
}


/*********************************************************************//**
 * @brief	Check whether the specified Raw interrupt status flag is
 * 			set or not
 * @param[in]	SSPx	SSP peripheral selected, should be SSP0 or SSP1
 * @param[in]	RawIntType	Raw Interrupt Type, should be:
 * 				- SSP_INTSTAT_RAW_ROR: Receive Overrun interrupt
 * 				- SSP_INTSTAT_RAW_RT: Receive Time out interrupt
 * 				- SSP_INTSTAT_RAW_RX: RX FIFO is at least half full interrupt
 * 				- SSP_INTSTAT_RAW_TX: TX FIFO is at least half empty interrupt
 * @return	New State of specified Raw interrupt status flag in SSP peripheral
 * Note: Enabling/Disabling specified interrupt in SSP peripheral does not
 * 		effect to Raw Interrupt Status flag.
 **********************************************************************/
IntStatus SSP_GetRawIntStatus(SSP_TypeDef *SSPx, uint32_t RawIntType)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));
	CHECK_PARAM(PARAM_SSP_INTSTAT_RAW(RawIntType));

	return ((SSPx->RIS & RawIntType) ? SET : RESET);
}


/*********************************************************************//**
 * @brief	Check whether the specified interrupt status flag is
 * 			set or not
 * @param[in]	SSPx	SSP peripheral selected, should be SSP0 or SSP1
 * @param[in]	RawIntType	Raw Interrupt Type, should be:
 * 				- SSP_INTSTAT_ROR: Receive Overrun interrupt
 * 				- SSP_INTSTAT_RT: Receive Time out interrupt
 * 				- SSP_INTSTAT_RX: RX FIFO is at least half full interrupt
 * 				- SSP_INTSTAT_TX: TX FIFO is at least half empty interrupt
 * @return	New State of specified interrupt status flag in SSP peripheral
 * Note: Enabling/Disabling specified interrupt in SSP peripheral effects
 * 			to Interrupt Status flag.
 **********************************************************************/
IntStatus SSP_GetIntStatus (SSP_TypeDef *SSPx, uint32_t IntType)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));
	CHECK_PARAM(PARAM_SSP_INTSTAT(IntType));

	return ((SSPx->MIS & IntType) ? SET :RESET);
}



/*********************************************************************//**
 * @brief				Clear specified interrupt pending in SSP peripheral
 * @param[in]	SSPx	SSP peripheral selected, should be SSP0 or SSP1
 * @param[in]	IntType	Interrupt pending to clear, should be:
 * 						- SSP_INTCLR_ROR: clears the "frame was received when
 * 						RxFIFO was full" interrupt.
 * 						- SSP_INTCLR_RT: clears the "Rx FIFO was not empty and
 * 						has not been read for a timeout period" interrupt.
 * @return		None
 **********************************************************************/
void SSP_ClearIntPending(SSP_TypeDef *SSPx, uint32_t IntType)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));
	CHECK_PARAM(PARAM_SSP_INTCLR(IntType));

	SSPx->ICR = IntType;
}

/**
 * @brief		Standard SSP0 Interrupt handler
 * @param[in] 	None
 * @return		None
 */
void SSP0_StdIntHandler(void)
{
	// Call relevant handler
	sspdat[0].inthandler(LPC_SSP0);
}

/**
 * @brief		Standard SSP1 Interrupt handler
 * @param[in] 	None
 * @return		None
 */
void SSP1_StdIntHandler(void)
{
	// Call relevant handler
	sspdat[1].inthandler(LPC_SSP1);
}

/**
 * @}
 */

#endif /* _SSP */

/**
 * @}
 */

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