DAC Library

DAC (Digital to Analog Converter) module is available with a number of ARM MCU modules. DAC is an electronic circuit that converts discrete digital numbers to continuous signals. DAC Library provides you a comfortable work with the module.

Library Routines

DACx_Init
DACx_Init_Advanced
DACx_Advanced_Chy_Output
DACx_Chy_Output
DAC1_Dual_Output
DACx_Output
DACx_Deinit

DACx_Init

Prototype

void DACx_Init(unsigned int channel);

// for Kinetis devices

void DACx_Init();

Description

This routine initializes DAC module and sets used channel.

Parameters

channel: used DAC channel :

Value Description

_DAC_CH1_ENABLE Channel 1.

_DAC_CH2_ENABLE Channel 2.

_DAC_DUAL_MODE_ENABLE Channels 1 and 2.

Returns

Nothing.

Requires

MCU with built-in DAC module.

Example

DAC1_Init(_DAC_CH1_ENABLE);  // Initialize DAC1 module for STM32 device, channel 1
DAC1_Init();  // Initialize DAC1 module for Kinetis device

Notes

DAC library routines require you to specify the module you want to use. To select the desired DAC module, simply change the letter x in the routine prototype for a number from 1 to 2.
Number of DAC modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.

DACx_Init_Advanced

Prototype

void DACx_Init_Advanced(unsigned long config);

Description

This routine initializes DAC module according to custom configuration.

Parameters

config: used DAC configuration :

Value	Description
_DAC_CFG_REFVOLT_SRC_VREF1	Select `DACREF_1` as the reference voltage.
_DAC_CFG_REFVOLT_SRC_VREF2	Select `DACREF_2` as the reference voltage.
_DAC_CFG_LOWPOWER_ENABLED	Enable the low power mode.

Returns

Nothing.

Requires

MCU with built-in DAC module.

Example

DAC0_Init_Advanced(_DAC_CFG_REFVOLT_SRC_VREF1 || _DAC_CFG_LOWPOWER_ENABLED);

Notes

DAC library routines require you to specify the module you want to use. To select the desired DAC module, simply change the letter x in the routine prototype for a number from 1 to 2.
Number of DAC modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.
This routine is available only for Kinetis devices.

DACx_Advanced_Chy_Output

Prototype

void DACx_Advanced_Chy_Output(unsigned long value, unsigned long config);

Description

This routine outputs analog value from the DAC module with user defined settings.

Parameters

value: output voltage value. Depending on the used mode (8-bit or 12-bit) this value is in range of 0-255 or 0-4095.
The output analog voltage is calculated according to the equation: DACoutput = VREF * value/mode,
where VREF is the voltage reference value from the VREF pin and mode is 255 (8-bit mode) or 4095 (12-bit mode).

config: configuration of the DAC module. Following constants can be or-ed to form the desired configuration :

Value	Description
_DAC_8_BIT	Set DAC module in 8-bit mode.
_DAC_12_BIT	Set DAC module in 12-bit mode.
_DAC_RIGHT_ALIGN	Right aligned data (available only in 12-bit mode).
_DAC_LEFT_ALIGN	Left aligned data (available only in 12-bit mode).
_DAC_NOISE_WAVE	Enable Noise-wave generation.
_DAC_TRIANGLE_WAVE	Enable Triangle-wave generation.
_DAC_WAVE_DISABLED	Wave generation disabled.
_DAC_MMAP_1	Unmask bit 0 of LFSR/ triangle amplitude equal to 1.
_DAC_MMAP_3	Unmask bits[1:0] of LFSR/ triangle amplitude equal to 3.
_DAC_MMAP_7	Unmask bits[2:0] of LFSR/ triangle amplitude equal to 7.
_DAC_MMAP_15	Unmask bits[3:0] of LFSR/ triangle amplitude equal to 15.
_DAC_MMAP_31	Unmask bits[4:0] of LFSR/ triangle amplitude equal to 31.
_DAC_MMAP_63	Unmask bits[5:0] of LFSR/ triangle amplitude equal to 63.
_DAC_MMAP_127	Unmask bits[6:0] of LFSR/ triangle amplitude equal to 127.
_DAC_MMAP_255	Unmask bits[7:0] of LFSR/ triangle amplitude equal to 255.
_DAC_MMAP_511	Unmask bits[8:0] of LFSR/ triangle amplitude equal to 511.
_DAC_MMAP_1023	Unmask bits[9:0] of LFSR/ triangle amplitude equal to 1023.
_DAC_MMAP_2047	Unmask bits[10:0] of LFSR/ triangle amplitude equal to 2047.
_DAC_MMAP_4095	Unmask bits[11:0] of LFSR/ triangle amplitude equal to 4095.
_DAC_TRIGGER_TIM6	Timer 6 used as DAC trigger selection.
_DAC_TRIGGER_TIM3	Timer 3 used as DAC trigger selection.
_DAC_TRIGGER_TIM7	Timer 7 used as DAC trigger selection.
_DAC_TRIGGER_TIM5	Timer 5 used as DAC trigger selection.
_DAC_TRIGGER_TIM18	Timer 18 used as DAC trigger selection.
_DAC_TRIGGER_TIM2	Timer 2 used as DAC trigger selection.
_DAC_TRIGGER_TIM4	Timer 4 used as DAC trigger selection.
_DAC_TRIGGER_EXTI	External interrupt used as DAC trigger selection.
_DAC_TRIGGER_SW	DAC triggered from the software.

Returns

Nothing.

Requires

The MCU with built-in DAC module.

Example

DAC1_Advanced_Ch1_Output(2047, _DAC_12_BIT | DAC_RIGHT_ALIGN | _DAC_WAVE_DISABLED | _DAC_TRIGGER_SW);  // get output from the channel 1 of DAC1 module

Notes

DAC library routines require you to specify the module you want to use. To select the desired DAC module, simply change the letter x in the routine prototype for a number from 1 to 2.
Also, simply change the letter y in the routine prototype for a number from 1 to 2 for a desired channel.
Number of DAC modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.
This routine is available only for STM32 devices.

DACx_Chy_Output

Prototype	void DACx_Chy_Output(unsigned long value);
Description	This routine outputs value from the DAC module and channel with the default settings : 12-bit mode, data right aligned, voltage reference taken from the Vref pin.
Parameters	`value:` output voltage value. This value is in range of 0-4095. The output analog voltage is calculated according to the equation: *`DACoutput = VREF value/4095`**, where `VREF` is the voltage reference value from the VREF pin.
Returns	Nothing.
Requires	The MCU with built-in DAC module.
Example	DAC1_Ch2_Output(127); // get output from the channel 2 of DAC1 module
Notes	DAC library routines require you to specify the module you want to use. To select the desired DAC module, simply change the letter x in the routine prototype for a number from 1 to 2. Also, simply change the letter y in the routine prototype for a number from 1 to 2 for a desired channel. Number of DAC modules/channelrs per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library. This routine is available only for STM32 devices.

DAC1_Dual_Output

Prototype

void DAC1_Dual_Output(unsigned long value1, unsigned long value2, unsigned long config1, unsigned long config2);

Description

This routine outputs value from both channels of the DAC1 module with user defined settings.

Parameters

value1, value2: output voltage value. Depending on the used mode (8-bit or 12-bit) this value is in range of 0-255 or 0-4095.
The output analog voltage is calculated according to the equation: DACoutput = VREF * value/mode,
where VREF is the voltage reference value from the VREF pin and mode is 255 (8-bit mode) or 4095 (12-bit mode).

config1, config2 : configuration of the DAC module. Following constants can be or-ed to form the desired configuration :

Value	Description
_DAC_8_BIT	Set DAC module in 8-bit mode.
_DAC_12_BIT	Set DAC module in 12-bit mode.
_DAC_RIGHT_ALIGN	Right aligned data (available only in 12-bit mode).
_DAC_LEFT_ALIGN	Left aligned data (available only in 12-bit mode).
_DAC_NOISE_WAVE	Enable Noise-wave generation.
_DAC_TRIANGLE_WAVE	Enable Triangle-wave generation.
_DAC_WAVE_DISABLED	Wave generation disabled.
_DAC_MMAP_1	Unmask bit 0 of LFSR/ triangle amplitude equal to 1.
_DAC_MMAP_3	Unmask bits[1:0] of LFSR/ triangle amplitude equal to 3.
_DAC_MMAP_7	Unmask bits[2:0] of LFSR/ triangle amplitude equal to 7.
_DAC_MMAP_15	Unmask bits[3:0] of LFSR/ triangle amplitude equal to 15.
_DAC_MMAP_31	Unmask bits[4:0] of LFSR/ triangle amplitude equal to 31.
_DAC_MMAP_63	Unmask bits[5:0] of LFSR/ triangle amplitude equal to 63.
_DAC_MMAP_127	Unmask bits[6:0] of LFSR/ triangle amplitude equal to 127.
_DAC_MMAP_255	Unmask bits[7:0] of LFSR/ triangle amplitude equal to 255.
_DAC_MMAP_511	Unmask bits[8:0] of LFSR/ triangle amplitude equal to 511.
_DAC_MMAP_1023	Unmask bits[9:0] of LFSR/ triangle amplitude equal to 1023.
_DAC_MMAP_2047	Unmask bits[10:0] of LFSR/ triangle amplitude equal to 2047.
_DAC_MMAP_4095	Unmask bits[11:0] of LFSR/ triangle amplitude equal to 4095.
_DAC_TRIGGER_TIM6	Timer 6 used as DAC trigger selection.
_DAC_TRIGGER_TIM3	Timer 3 used as DAC trigger selection.
_DAC_TRIGGER_TIM7	Timer 7 used as DAC trigger selection.
_DAC_TRIGGER_TIM5	Timer 5 used as DAC trigger selection.
_DAC_TRIGGER_TIM18	Timer 18 used as DAC trigger selection.
_DAC_TRIGGER_TIM2	Timer 2 used as DAC trigger selection.
_DAC_TRIGGER_TIM4	Timer 4 used as DAC trigger selection.
_DAC_TRIGGER_EXTI	External interrupt used as DAC trigger selection.
_DAC_TRIGGER_SW	DAC triggered from the software.

Returns

Nothing.

Requires

The MCU with built-in DAC module.

Example

DAC1_Dual_Output(2047, _DAC_12_BIT, 511, _DAC_8_BIT);  // get output from both channels of DAC1 module

Notes

This routine is available only for STM32 devices.

DACx_Output

Prototype	void DACx_Output(unsigned int value);
Description	This routine drives the DAC module to output DAC value.
Parameters	`value` output voltage value. This value is in range of 0-4095. The output analog voltage is calculated according to the equation: *`DACoutput = VREF value/4095`**, where `VREF` is the voltage reference value..
Returns	Nothing.
Requires	The MCU with built-in DAC module.
Example	DAC1_Output(2047); // get output from DAC1 module
Notes	This routine is available only for Kinetis devices.

DACx_Deinit

Prototype	void DACx_Deinit();
Description	This function deinitializes previously used DAC module
Parameters	None.
Returns	Nothing.
Requires	The MCU with built-in DAC module.
Example	DAC1_Deinit(); // deinitialize DAC1 module
Notes	DAC library routines require you to specify the module you want to use. To select the desired DAC module, simply change the letter x in the routine prototype for a number from 1 to 2. Number of DAC modules/channelrs per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library. This routine is available only for STM32 devices.

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