MIOS32_I2S

Defines
#define	MIOS32_I2S_PERIPHERAL_FRQ   (MIOS32_SYS_CPU_FREQUENCY)
#define	MIOS32_I2S_DIV2   1
#define	MIOS32_I2S_CLK_INIT   { MIOS32_SYS_LPC_PINSEL(2, 11, 3); }
#define	MIOS32_I2S_WS_INIT   { MIOS32_SYS_LPC_PINSEL(2, 12, 3); }
#define	MIOS32_I2S_SDA_INIT   { MIOS32_SYS_LPC_PINSEL(2, 13, 3); }
#define	MIOS32_I2S_MCLK_INIT   { MIOS32_SYS_LPC_PINSEL(4, 29, 1); }
#define	MIOS32_I2S_DMA_REQ   5
#define	MIOS32_I2S_DMA_CHN   5
#define	MIOS32_I2S_WS_PIN   GPIO_Pin_12;
#define	MIOS32_I2S_WS_PORT   GPIOB
#define	MIOS32_I2S_CK_PIN   GPIO_Pin_13;
#define	MIOS32_I2S_CK_PORT   GPIOB
#define	MIOS32_I2S_SD_PIN   GPIO_Pin_15;
#define	MIOS32_I2S_SD_PORT   GPIOB
#define	MIOS32_I2S_MCLK_PIN   GPIO_Pin_6;
#define	MIOS32_I2S_MCLK_PORT   GPIOC
Functions
s32	MIOS32_I2S_Init (u32 mode)
s32	MIOS32_I2S_Start (u32 *buffer, u16 len, void *_callback)
s32	MIOS32_I2S_Stop (void)
void	DMA1_Channel5_IRQHandler (void)

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Detailed Description

I2S Functions

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Define Documentation

#define MIOS32_I2S_CK_PIN   GPIO_Pin_13;

#define MIOS32_I2S_CK_PORT   GPIOB

#define MIOS32_I2S_CLK_INIT   { MIOS32_SYS_LPC_PINSEL(2, 11, 3); }

#define MIOS32_I2S_DIV2   1

#define MIOS32_I2S_DMA_CHN   5

#define MIOS32_I2S_DMA_REQ   5

#define MIOS32_I2S_MCLK_INIT   { MIOS32_SYS_LPC_PINSEL(4, 29, 1); }

#define MIOS32_I2S_MCLK_PIN   GPIO_Pin_6;

#define MIOS32_I2S_MCLK_PORT   GPIOC

#define MIOS32_I2S_PERIPHERAL_FRQ   (MIOS32_SYS_CPU_FREQUENCY)

#define MIOS32_I2S_SD_PIN   GPIO_Pin_15;

#define MIOS32_I2S_SD_PORT   GPIOB

#define MIOS32_I2S_SDA_INIT   { MIOS32_SYS_LPC_PINSEL(2, 13, 3); }

#define MIOS32_I2S_WS_INIT   { MIOS32_SYS_LPC_PINSEL(2, 12, 3); }

#define MIOS32_I2S_WS_PIN   GPIO_Pin_12;

#define MIOS32_I2S_WS_PORT   GPIOB

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Function Documentation

void DMA1_Channel5_IRQHandler

(

void

)

DMA1 Channel interrupt is triggered on HT and TC interrupts

Note:

shouldn't be called directly from application

s32 MIOS32_I2S_Init

(

u32

mode

)

Initializes I2S interface

Parameters:

[in]

mode

currently only mode 0 supported

Returns:

< 0 if initialisation failed

s32 MIOS32_I2S_Start	(	u32 *	buffer,
		u16	len,
		void *	_callback
	)

Starts DMA driven I2S transfers

Parameters:

[in]	*buffer	pointer to sample buffer (contains L/R halfword)
[in]	len	size of audio buffer
[in]	_callback	callback function: void callback(u32 state) called when the lower (state == 0) or upper (state == 1) range of the sample buffer has been transfered, so that it can be updated

Returns:

< 0 if initialisation failed

s32 MIOS32_I2S_Stop

(

void

)

Stops DMA driven I2S transfers

Returns:

< 0 if initialisation failed

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