12.2 DAC Firmware driver API description
12.2.1 DAC Peripheral features
DAC Channels
The device integrates two 12-bit Digital Analog Converters that can be used independently
or simultaneously (dual mode):
1. DAC channel1 with DAC_OUT1 (PA4) as output
2. DAC channel2 with DAC_OUT2 (PA5) as output
DAC Triggers
Digital to Analog conversion can be non-triggered using DAC_TRIGGER_NONE and
DAC_OUT1/DAC_OUT2 is available once writing to DHRx register.
Digital to Analog conversion can be triggered by:
1. External event: EXTI Line 9 (any GPIOx_Pin9) using DAC_TRIGGER_EXT_IT9. The
used pin (GPIOx_Pin9) must be configured in input mode.
2. Timers TRGO: TIM2, TIM4, TIM5, TIM6, TIM7 and TIM8 (DAC_TRIGGER_T2_TRGO,
DAC_TRIGGER_T4_TRGO...)
3. Software using DAC_TRIGGER_SOFTWARE
DAC Buffer mode feature
Each DAC channel integrates an output buffer that can be used to reduce the output
impedance, and to drive external loads directly without having to add an external
operational amplifier. To enable, the output buffer use sConfig.DAC_OutputBuffer =
DAC_OUTPUTBUFFER_ENABLE;
Refer to the device datasheet for more details about output impedance value with
and without output buffer.
DAC wave generation feature
Both DAC channels can be used to generate
1. Noise wave
2. Triangle wave
DAC data format
The DAC data format can be:
1. 8-bit right alignment using DAC_ALIGN_8B_R
2. 12-bit left alignment using DAC_ALIGN_12B_L
3. 12-bit right alignment using DAC_ALIGN_12B_R
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