ANALOG_OUT

analog_out functions More...

Ameba1 Only
typedef struct dac_s	dac_t
void	analogout_init (dac_t *obj, PinName pin)
	Initialize DAC. More...
void	analogout_free (dac_t *obj)
	Free DAC. More...
void	analogout_write (dac_t *obj, float value)
	Execute analog output obj: dac object define in application software. value: analog ratio value, should be transfered to register value. More...
void	analogout_write_u16 (dac_t *obj, uint16_t value)
	Execute analog output 16bit obj: dac object define in application software. value: analog ratio value, should be transfered to register value. More...

Detailed Description

analog_out functions

Function Documentation

void analogout_free

(

dac_t *

obj

)

Free DAC.

Parameters

obj	dac object define in application software.

Return values

none

void analogout_init	(	dac_t *	obj,
		PinName	pin
	)

Initialize DAC.

Parameters

obj	dac object define in application software.
pin	dac PinName according to pinmux spec.

Return values

none

void analogout_write	(	dac_t *	obj,
		float	value
	)

Execute analog output obj: dac object define in application software. value: analog ratio value, should be transfered to register value.

Return values

none

Note

This function is mainly to execute analog output and the value is a ratio. The upper/lower bound of DAC register input value is defined by DAC_XXXXX_FULL_SCALE. The parameter "value" of this function should be transfered to register value.

void analogout_write_u16	(	dac_t *	obj,
		uint16_t	value
	)

Execute analog output 16bit obj: dac object define in application software. value: analog ratio value, should be transfered to register value.

Return values

none

Note

The register value of DAC input is a format of 2's complement. The most maximum value of positive value drives DAC to output a voltage about 3.3V. The most mimimum value of negative value drives DAC to output a voltage about 0. And the middle value of 0x000 will drive DAC to output a voltage of half of max voltage.