/*********************************************************************//**
* @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)));
}
/*********************************************************************//**
* @brief Transmit a single data through SSPx peripheral
* @param[in] SSPx SSP peripheral selected, should be:
* - LPC_SSP0: SSP0 peripheral
* - LPC_SSP1: SSP1 peripheral
* @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(LPC_SSP_TypeDef* SSPx, uint16_t Data)
{
CHECK_PARAM(PARAM_SSPx(SSPx));
SSPx->DR = SSP_DR_BITMASK(Data);
}
/*****************************************************************************//**
* @brief Get data size bit selected
* @param[in] SSPx pointer to LPC_SSP_TypeDef structure, should be:
* - LPC_SSP0: SSP0 peripheral
* - LPC_SSP1: SSP1 peripheral
* @return Data size, could be:
* - SSP_DATABIT_4: 4 bit transfer
* - SSP_DATABIT_5: 5 bit transfer
* ...
* - SSP_DATABIT_16: 16 bit transfer
*******************************************************************************/
uint8_t SSP_GetDataSize(LPC_SSP_TypeDef* SSPx)
{
CHECK_PARAM(PARAM_SSPx(SSPx));
return (SSPx->CR0 & (0xF));
}
