hdw-dac.c File Reference

Macros
#define	DMA_DESCRIPTORS   4

Functions
void	initDac (dac_channel_mask_t channel, gpio_num_t shdn_gpio, fnDacCallback_t cb)
	Initialize the DAC.
void	deinitDac (void)
	Deinitialize the DAC and free memory.
void	powerDownDac (void)
	Power down the DAC (speaker)
void	powerUpDac (void)
	Power up the DAC (speaker)
void	dacStart (void)
	Start the DAC. This will cause samples to be requested from the application.
void	dacStop (void)
	Stop the DAC.
void	dacPoll (void)
	Poll the queue to see if any buffers need to be filled with audio samples.
void	setDacShutdown (bool shutdown)
	Set the shutdown state of the DAC.

Macro Definition Documentation

DMA_DESCRIPTORS

#define DMA_DESCRIPTORS   4

The number of buffers to use. The more buffers, the longer latency

Function Documentation

initDac()

void initDac	(	dac_channel_mask_t	channel,
		gpio_num_t	shdn_gpio,
		fnDacCallback_t	cb )

Initialize the DAC.

Parameters

channel	The output channel (pin) for the ADC
shdn_gpio	The GPIO that controls the amplifier's shutdown
cb	A callback function which will be called to request samples from the application

deinitDac()

void deinitDac

(

void

)

Deinitialize the DAC and free memory.

powerDownDac()

void powerDownDac

(

void

)

Power down the DAC (speaker)

powerUpDac()

void powerUpDac

(

void

)

Power up the DAC (speaker)

dacStart()

void dacStart

(

void

)

Start the DAC. This will cause samples to be requested from the application.

dacStop()

void dacStop

(

void

)

Stop the DAC.

dacPoll()

void dacPoll

(

void

)

Poll the queue to see if any buffers need to be filled with audio samples.

setDacShutdown()

void setDacShutdown

(

bool

shutdown

)

Set the shutdown state of the DAC.

Parameters

shutdown

true to shut down the DAC, false to enable it