C++ PARAM_SSPx函数代码示例

/*********************************************************************//**
 * @brief				Clear specified interrupt pending in SSP peripheral
 * @param[in]	SSPx	SSP peripheral selected, should be:
 *  					- LPC_SSP0: SSP0 peripheral
 * 						- LPC_SSP1: SSP1 peripheral
 * @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(LPC_SSP_TypeDef *SSPx, uint32_t IntType)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));
	CHECK_PARAM(PARAM_SSP_INTCLR(IntType));

	SSPx->ICR = IntType;
}

/********************************************************************//**
 * @brief		Initializes the SSPx peripheral according to the specified
*               parameters in the SSP_ConfigStruct.
 * @param[in]	SSPx	SSP peripheral selected, should be:
 * 				 		- LPC_SSP0: SSP0 peripheral
 * 						- LPC_SSP1: SSP1 peripheral
 * @param[in]	SSP_ConfigStruct Pointer to a SSP_CFG_Type structure
*                    that contains the configuration information for the
*                    specified SSP peripheral.
 * @return 		None
 *********************************************************************/
void SSP_Init(LPC_SSP_TypeDef *SSPx, SSP_CFG_Type *SSP_ConfigStruct)
{
	uint32_t tmp;

	CHECK_PARAM(PARAM_SSPx(SSPx));

	if(SSPx == LPC_SSP0) {
		/* Set up clock and power for SSP0 module */
		CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCSSP0, ENABLE);
	} else if(SSPx == LPC_SSP1) {
		/* Set up clock and power for SSP1 module */
		CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCSSP1, ENABLE);
	} else {
		return;
	}

	/* Configure SSP, interrupt is disable, LoopBack mode is disable,
	 * SSP is disable, Slave output is disable as default
	 */
	tmp = ((SSP_ConfigStruct->CPHA) | (SSP_ConfigStruct->CPOL) \
		| (SSP_ConfigStruct->FrameFormat) | (SSP_ConfigStruct->Databit))
		& SSP_CR0_BITMASK;
	// write back to SSP control register
	SSPx->CR0 = tmp;

	tmp = SSP_ConfigStruct->Mode & SSP_CR1_BITMASK;
	// Write back to CR1
	SSPx->CR1 = tmp;

	// Set clock rate for SSP peripheral
	setSSPclock(SSPx, SSP_ConfigStruct->ClockRate);
}

/*********************************************************************//**
 * @brief		De-initializes the SSPx peripheral registers to their
 *              default reset values.
 * @param[in]	SSPx SSP peripheral selected, should be:
 * 				 	- LPC_SSP0	:SSP0 peripheral
 * 					- LPC_SSP1	:SSP1 peripheral
 * @return 		None
 **********************************************************************/
void SSP_DeInit(LPC_SSPn_Type* SSPx)
{
    CHECK_PARAM(PARAM_SSPx(SSPx));

    /* Disable SSP operation*/
    SSPx->CR1 &= (~SSP_CR1_SSP_EN) & SSP_CR1_BITMASK;
}

/*********************************************************************//**
 * @brief	Check whether the specified interrupt status flag is
 * 			set or not
 * @param[in]	SSPx	SSP peripheral selected, should be:
 * 						- LPC_SSP0: SSP0 peripheral
 * 						- LPC_SSP1: SSP1 peripheral
 * @param[in]	IntType	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 (LPC_SSP_TypeDef *SSPx, uint32_t IntType)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));
	CHECK_PARAM(PARAM_SSP_INTSTAT(IntType));

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

/*********************************************************************//**
 * @brief	Check whether the specified Raw interrupt status flag is
 * 			set or not
 * @param[in]	SSPx	SSP peripheral selected, should be:
 * 						- LPC_SSP0: SSP0 peripheral
 * 						- LPC_SSP1: SSP1 peripheral
 * @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(LPC_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		Checks whether the specified SSP status flag is set or not
 * @param[in]	SSPx	SSP peripheral selected, should be:
 * 		 				- LPC_SSP0: SSP0 peripheral
 * 						- LPC_SSP1: SSP1 peripheral
 * @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(LPC_SSP_TypeDef* SSPx, uint32_t FlagType)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));
	CHECK_PARAM(PARAM_SSP_STAT(FlagType));

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

/********************************************************************//**
 * @brief		Initializes the SSPx peripheral according to the specified
 *              parameters in the SSP_ConfigStruct.
 * @param[in]	SSPx SSP peripheral selected, should be:
 * 				 	- LPC_SSP0	:SSP0 peripheral
 * 					- LPC_SSP1	:SSP1 peripheral
 * @param[in]	SSP_ConfigStruct Pointer to a SSP_CFG_Type structure that
 * 				contains the configuration information for the specified
 * 				SSP peripheral.
 * @return 		None
 *********************************************************************/
void SSP_Init(LPC_SSPn_Type *SSPx, SSP_CFG_Type *SSP_ConfigStruct)
{
	uint32_t tmp;
	uint32_t prescale, cr0_div, cmp_clk;
	uint64_t ssp_clk;

	CHECK_PARAM(PARAM_SSPx(SSPx));

	if(SSPx == LPC_SSP0) {
		/* Set up clock and power for SSP0 module */
		//LPC_CGU->BASE_SSP0_CLK = (SRC_PL160M_0<<24) | (1<<11);
		CGU_EntityConnect(CGU_CLKSRC_PLL1, CGU_BASE_SSP0);
	} else if(SSPx == LPC_SSP1) {
		/* Set up clock and power for SSP1 module */
		//LPC_CGU->BASE_SSP1_CLK = (SRC_PL160M_0<<24) | (1<<11);
		CGU_EntityConnect(CGU_CLKSRC_PLL1, CGU_BASE_SSP1);
	} else {
		return;
	}

	/* Configure SSP, interrupt is disable, LoopBack mode is disable,
	 * SSP is disable, Slave output is disable as default
	 */
	tmp = ((SSP_ConfigStruct->CPHA) | (SSP_ConfigStruct->CPOL) \
		| (SSP_ConfigStruct->FrameFormat) | (SSP_ConfigStruct->Databit))
		& SSP_CR0_BITMASK;
	// write back to SSP control register
	SSPx->CR0 = tmp;

	tmp = SSP_ConfigStruct->Mode & SSP_CR1_BITMASK;
	// Write back to CR1
	SSPx->CR1 = tmp;

	// Set clock rate for SSP peripheral
	if(SSPx == LPC_SSP0)
		ssp_clk = CGU_GetPCLKFrequency(CGU_PERIPHERAL_SSP0);
	else
		ssp_clk = CGU_GetPCLKFrequency(CGU_PERIPHERAL_SSP1);
	cr0_div = 0;
	cmp_clk = 0xFFFFFFFF;
	prescale = 2;
	while (cmp_clk > SSP_ConfigStruct->ClockRate)
	{
		cmp_clk = ssp_clk / ((cr0_div + 1) * prescale);
		if (cmp_clk > SSP_ConfigStruct->ClockRate)
		{
			cr0_div++;
			if (cr0_div > 0xFF)
			{
				cr0_div = 0;
				prescale += 2;
			}
		}
	}

    /* Write computed prescaler and divider back to register */
    SSPx->CR0 &= (~SSP_CR0_SCR(0xFF)) & SSP_CR0_BITMASK;
    SSPx->CR0 |= (SSP_CR0_SCR(cr0_div)) & SSP_CR0_BITMASK;
    SSPx->CPSR = prescale & SSP_CPSR_BITMASK;
}

/*********************************************************************//**
 * @brief		Enable or disable Loop Back mode function in SSP peripheral
 * @param[in]	SSPx	SSP peripheral selected, should be:
 * 				 	- LPC_SSP0	:SSP0 peripheral
 * 					- LPC_SSP1	:SSP1 peripheral
 * @param[in]	NewState	New State of Loop Back mode, should be:
 * 					- ENABLE
 * 					- DISABLE
 * @return 		None
 **********************************************************************/
void SSP_LoopBackCmd(LPC_SSPn_Type* 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 specified interrupt type in SSP peripheral
 * @param[in]	SSPx	SSP peripheral selected, should be:
 * 				 	- LPC_SSP0	:SSP0 peripheral
 * 					- LPC_SSP1	:SSP1 peripheral
 * @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(LPC_SSPn_Type *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		Enable or disable Slave Output function in SSP peripheral
 * @param[in]	SSPx	SSP peripheral selected, should be:
 * 				 	- LPC_SSP0	:SSP0 peripheral
 * 					- LPC_SSP1	:SSP1 peripheral
 * @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(LPC_SSPn_Type* 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		De-initializes the SSPx peripheral registers to their
*                  default reset values.
 * @param[in]	SSPx	SSP peripheral selected, should be:
 * 				 		- LPC_SSP0: SSP0 peripheral
 * 						- LPC_SSP1: SSP1 peripheral
 * @return 		None
 **********************************************************************/
void SSP_DeInit(LPC_SSP_TypeDef* SSPx)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));

	if (SSPx == LPC_SSP0){
		/* Set up clock and power for SSP0 module */
		CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCSSP0, DISABLE);
	} else if (SSPx == LPC_SSP1) {
		/* Set up clock and power for SSP1 module */
		CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCSSP1, DISABLE);
	}
}

/*********************************************************************//**
 * @brief		Enable/Disable DMA function for SSP peripheral
 * @param[in]	SSPx	SSP peripheral selected, should be:
 * 				 	- LPC_SSP0	:SSP0 peripheral
 * 					- LPC_SSP1	:SSP1 peripheral
 * @param[in]	DMAMode	Type of DMA, should be:
 * 					- SSP_DMA_TX	:DMA for the transmit FIFO
 * 					- SSP_DMA_RX	:DMA for the Receive FIFO
 * @param[in]	NewState	New State of DMA function on SSP peripheral,
 * 						should be:
 * 					- ENALBE	:Enable this function
 * 					- DISABLE	:Disable this function
 * @return		None
 **********************************************************************/
void SSP_DMACmd(LPC_SSPn_Type *SSPx, uint32_t DMAMode, FunctionalState NewState)
{
    CHECK_PARAM(PARAM_SSPx(SSPx));
    CHECK_PARAM(PARAM_SSP_DMA(DMAMode));
    CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));

    if (NewState == ENABLE) {
        SSPx->DMACR |= DMAMode;
    } else {
        SSPx->DMACR &= (~DMAMode) & SSP_DMA_BITMASK;
    }
}

/*********************************************************************//**
 * @brief 		Setup clock rate for SSP device
 * @param[in] 	SSPx	SSP peripheral definition, should be:
 * 						- LPC_SSP0: SSP0 peripheral
 * 						- LPC_SSP1: SSP1 peripheral
 * @param[in]	target_clock : clock of SSP (Hz)
 * @return 		None
 ***********************************************************************/
static void setSSPclock (LPC_SSP_TypeDef *SSPx, uint32_t target_clock)
{
    uint32_t prescale, cr0_div, cmp_clk, ssp_clk;

    CHECK_PARAM(PARAM_SSPx(SSPx));

    /* The SSP clock is derived from the (main system oscillator / 2),
       so compute the best divider from that clock */
    if (SSPx == LPC_SSP0){
    	ssp_clk = CLKPWR_GetPCLK (CLKPWR_PCLKSEL_SSP0);
    } else if (SSPx == LPC_SSP1) {
    	ssp_clk = CLKPWR_GetPCLK (CLKPWR_PCLKSEL_SSP1);
    } else {
    	return;
    }

	/* Find closest divider to get at or under the target frequency.
	   Use smallest prescale possible and rely on the divider to get
	   the closest target frequency */
	cr0_div = 0;
	cmp_clk = 0xFFFFFFFF;
	prescale = 2;
	while (cmp_clk > target_clock)
	{
		cmp_clk = ssp_clk / ((cr0_div + 1) * prescale);
		if (cmp_clk > target_clock)
		{
			cr0_div++;
			if (cr0_div > 0xFF)
			{
				cr0_div = 0;
				prescale += 2;
			}
		}
	}

    /* Write computed prescaler and divider back to register */
    SSPx->CR0 &= (~SSP_CR0_SCR(0xFF)) & SSP_CR0_BITMASK;
    SSPx->CR0 |= (SSP_CR0_SCR(cr0_div)) & SSP_CR0_BITMASK;
    SSPx->CPSR = prescale & SSP_CPSR_BITMASK;
}

/*********************************************************************//**
 * @brief		Get Raw Interrupt Status register
 * @param[in]	SSPx	SSP peripheral selected, should be:
 * 						- LPC_SSP0: SSP0 peripheral
 * 						- LPC_SSP1: SSP1 peripheral
 * @return		Raw Interrupt Status (RIS) register value
 **********************************************************************/
uint32_t SSP_GetRawIntStatusReg(LPC_SSP_TypeDef *SSPx)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));
	return (SSPx->RIS);
}

/*********************************************************************//**
 * @brief		Receive a single data from SSPx peripheral
 * @param[in]	SSPx	SSP peripheral selected, should be
 * 						- LPC_SSP0: SSP0 peripheral
 * 						- LPC_SSP1: SSP1 peripheral
 * @return 		Data received (16-bit long)
 **********************************************************************/
uint16_t SSP_ReceiveData(LPC_SSP_TypeDef* SSPx)
{
	CHECK_PARAM(PARAM_SSPx(SSPx));

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