lpc177x_8x_i2s.c

LPC1788的USBHOST的FATFS移植

 * @brief		Set frequency for I2S
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	Freq is the frequency for I2S will be set. It can range
 * 				from 16-96 kHz(16, 22.05, 32, 44.1, 48, 96kHz)
 * @param[in]	TRMode is transmit/receive mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @return 		Status: ERROR or SUCCESS
 *********************************************************************/
Status I2S_FreqConfig(LPC_I2S_TypeDef *I2Sx, uint32_t Freq, uint8_t TRMode) {
	uint32_t i2sMclk;
	uint8_t bitrate, channel, wordwidth;

 	//use cclk/2 as default I2S reference clock
	i2sMclk = CLKPWR_GetCLK(CLKPWR_CLKTYPE_CPU)/2;
	I2Sx->TXRATE = 1  | (1<<8);
	I2Sx->RXRATE = 1  | (1<<8);
	if(TRMode == I2S_TX_MODE)
	{
		channel = i2s_GetChannel(I2Sx,I2S_TX_MODE);
		wordwidth = i2s_GetWordWidth(I2Sx,I2S_TX_MODE);
	}
	else
	{
		channel = i2s_GetChannel(I2Sx,I2S_RX_MODE);
		wordwidth = i2s_GetWordWidth(I2Sx,I2S_RX_MODE);
	}
	bitrate = i2sMclk /(Freq * channel  * wordwidth) - 1;
	if (TRMode == I2S_TX_MODE)// Transmitter
	{
		I2Sx->TXBITRATE = bitrate;
	} else //Receiver
	{
		I2Sx->RXBITRATE = bitrate;
	}
	return SUCCESS;
}

/********************************************************************//**
 * @brief		I2S set bitrate
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	bitrate value will be set
 * 				bitrate value should be in range: 0 .. 63
 * @param[in]	TRMode is transmit/receive mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @return 		none
 *********************************************************************/
void I2S_SetBitRate(LPC_I2S_TypeDef *I2Sx, uint8_t bitrate, uint8_t TRMode)
{
	if(TRMode == I2S_TX_MODE)
	{
		I2Sx->TXBITRATE = bitrate;
	}
	else
	{
		I2Sx->RXBITRATE = bitrate;
	}
}

/********************************************************************//**
 * @brief		Configuration operating mode for I2S
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	ModeConfig pointer to I2S_MODEConf_Type will be used to
 * 				configure
 * @param[in]	TRMode is transmit/receive mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @return 		none
 *********************************************************************/
void I2S_ModeConfig(LPC_I2S_TypeDef *I2Sx, I2S_MODEConf_Type* ModeConfig,
		uint8_t TRMode)
{
	if (TRMode == I2S_TX_MODE) {
		I2Sx->TXMODE &= ~0x0F; //clear bit 3:0 in I2STXMODE register
		if (ModeConfig->clksel == I2S_CLKSEL_MCLK) {
			I2Sx->TXMODE |= 0x02;
		}
		if (ModeConfig->fpin == I2S_4PIN_ENABLE) {
			I2Sx->TXMODE |= (1 << 2);
		}
		if (ModeConfig->mcena == I2S_MCLK_ENABLE) {
			I2Sx->TXMODE |= (1 << 3);
		}
	} else {
		I2Sx->RXMODE &= ~0x0F; //clear bit 3:0 in I2STXMODE register
		if (ModeConfig->clksel == I2S_CLKSEL_MCLK) {
			I2Sx->RXMODE |= 0x02;
		}
		if (ModeConfig->fpin == I2S_4PIN_ENABLE) {
			I2Sx->RXMODE |= (1 << 2);
		}
		if (ModeConfig->mcena == I2S_MCLK_ENABLE) {
			I2Sx->RXMODE |= (1 << 3);
		}
	}
}

/********************************************************************//**
 * @brief		Configure DMA operation for I2S
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	DMAConfig pointer to I2S_DMAConf_Type will be used to configure
 * @param[in]	TRMode is transmit/receive mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @return 		none
 *********************************************************************/
void I2S_DMAConfig(LPC_I2S_TypeDef *I2Sx, I2S_DMAConf_Type* DMAConfig,
		uint8_t TRMode)
{
	if (TRMode == I2S_RX_MODE) {
		if (DMAConfig->DMAIndex == I2S_DMA_1) {
			LPC_I2S->DMA1 = (DMAConfig->depth) << 8;
		} else {
			LPC_I2S->DMA2 = (DMAConfig->depth) << 8;
		}
	} else {
		if (DMAConfig->DMAIndex == I2S_DMA_1) {
			LPC_I2S->DMA1 = (DMAConfig->depth) << 16;
		} else {
			LPC_I2S->DMA2 = (DMAConfig->depth) << 16;
		}
	}
}

/********************************************************************//**
 * @brief		Enable/Disable DMA operation for I2S
 * @param[in]	I2Sx: I2S peripheral selected, should be: LPC_I2S
 * @param[in]	DMAIndex chose what DMA is used, should be:
 * 				- I2S_DMA_1 = 0: DMA1
 * 				- I2S_DMA_2 = 1: DMA2
 * @param[in]	TRMode is transmit/receive mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @param[in]	NewState is new state of DMA operation, should be:
 * 				- ENABLE
 * 				- DISABLE
 * @return 		none
 *********************************************************************/
void I2S_DMACmd(LPC_I2S_TypeDef *I2Sx, uint8_t DMAIndex, uint8_t TRMode,
		FunctionalState NewState)
{
	if (TRMode == I2S_RX_MODE) {
		if (DMAIndex == I2S_DMA_1) {
			if (NewState == ENABLE)
				I2Sx->DMA1 |= 0x01;
			else
				I2Sx->DMA1 &= ~0x01;
		} else {
			if (NewState == ENABLE)
				I2Sx->DMA2 |= 0x01;
			else
				I2Sx->DMA2 &= ~0x01;
		}
	} else {
		if (DMAIndex == I2S_DMA_1) {
			if (NewState == ENABLE)
				I2Sx->DMA1 |= 0x02;
			else
				I2Sx->DMA1 &= ~0x02;
		} else {
			if (NewState == ENABLE)
				I2Sx->DMA2 |= 0x02;
			else
				I2Sx->DMA2 &= ~0x02;
		}
	}
}

/********************************************************************//**
 * @brief		Configure IRQ for I2S
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	TRMode is transmit/receive mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @param[in]	level is the FIFO level that triggers IRQ request
 * @return 		none
 *********************************************************************/
void I2S_IRQConfig(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode, uint8_t level) {
	if (TRMode == I2S_RX_MODE) {
		I2Sx->IRQ |= (level << 8);
	} else {
		I2Sx->IRQ |= (level << 16);
	}
}

/********************************************************************//**
 * @brief		Enable/Disable IRQ for I2S
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	TRMode is transmit/receive mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @param[in]	NewState is new state of DMA operation, should be:
 * 				- ENABLE
 * 				- DISABLE
 * @return 		none
 *********************************************************************/
void I2S_IRQCmd(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode, FunctionalState NewState) {

	if (TRMode == I2S_RX_MODE) {
		if (NewState == ENABLE)
			I2Sx->IRQ |= 0x01;
		else
			I2Sx->IRQ &= ~0x01;
		//Enable DMA

	} else {
		if (NewState == ENABLE)
			I2Sx->IRQ |= 0x02;
		else
			I2Sx->IRQ &= ~0x02;
	}
}

/********************************************************************//**
 * @brief		Get I2S interrupt status
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	TRMode is transmit/receive mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @return 		FunctionState	should be:
 * 				- ENABLE: interrupt is enable
 * 				- DISABLE: interrupt is disable
 *********************************************************************/
FunctionalState I2S_GetIRQStatus(LPC_I2S_TypeDef *I2Sx,uint8_t TRMode)
{

	if(TRMode == I2S_TX_MODE)
		return ((I2Sx->IRQ >> 1)&0x01);
	else
		return ((I2Sx->IRQ)&0x01);
}

/********************************************************************//**
 * @brief		Get I2S interrupt depth
 * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
 * @param[in]	TRMode is transmit/receive mode, should be:
 * 				- I2S_TX_MODE = 0: transmit mode
 * 				- I2S_RX_MODE = 1: receive mode
 * @return 		depth of FIFO level on which to create an irq request
 *********************************************************************/
uint8_t I2S_GetIRQDepth(LPC_I2S_TypeDef *I2Sx,uint8_t TRMode)
{

	if(TRMode == I2S_TX_MODE)
		return (((I2Sx->IRQ)>>16)&0xFF);
	else
		return (((I2Sx->IRQ)>>8)&0xFF);
}
/**
 * @}
 */


/**
 * @}
 */

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