Triangle-Wave Generation; Figure 59. Dac Conversion (Sw Trigger Enabled) With Lfsr Wave Generation; Figure 60. Dac Triangle Wave Generation - ST STM32F40 Series Reference Manual

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The DAC trigger must be enabled for noise generation by setting the TENx bit in the

DAC_CR register.

Triangle-wave generation

It is possible to add a small-amplitude triangular waveform on a DC or slowly varying signal.

DAC triangle-wave generation is selected by setting WAVEx[1:0] to "10". The amplitude is

configured through the MAMPx[3:0] bits in the DAC_CR register. An internal triangle counter

is incremented three APB1 clock cycles after each trigger event. The value of this counter is

then added to the DAC_DHRx register without overflow and the sum is stored into the

DAC_DORx register. The triangle counter is incremented as long as it is less than the

maximum amplitude defined by the MAMPx[3:0] bits. Once the configured amplitude is

reached, the counter is decremented down to 0, then incremented again and so on.

It is possible to reset triangle wave generation by resetting the WAVEx[1:0] bits.

DAC_DHRx base value

MAMPx[3:0] max amplitude

+ DAC_DHRx base value

Doc ID 018909 Rev 4

Digital-to-analog converter (DAC)

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