DocID022897 Rev 3

11/17

AN4062

Peripheral firmware examples description

3.12

DMA RAM DAC example

Purpose

This example provides a description of how to use a DMA channel to transfer data buffer

from RAM memory to DAC.

Description

DMA1 channel3 is configured to transfer continuously, word by word, a Half-word buffer to

the DAC register DAC_DHR12R. The DAC channel conversion is configured to be triggered

by TIM2 TRGO triggers and without noise/triangle wave generation.12-bit right data

alignment is selected since we choose to access the DAC_DHR12R register.

Note:

Connect PA.04 pin to an oscilloscope.

3.13

DAC signal generation example

Purpose

This example provides a short description of how to use the DAC peripheral to generate

several signals using the DMA controller.

Description

When the user presses the push-button, DMA transfers the selected waveform to DAC.

•

For each press on the push-button, one signal has been selected and monitored on the

DAC Channel 1

•

Escalator waveform (Channel 1).

•

Sine waveForm (Channel 1).

Note:

Use the push-button connected to PA0.

Note:

Connect PA4 (DAC Channel1) pin to an oscilloscope to monitor the DAC out wave.

3.14

TIM complementary signal example

Purpose

This example shows how to configure the TIM1 peripheral to generate three complementary

TIM1 signals, to insert a defined dead time value, to use the break feature and to lock the

desired parameters.

Description

TIM1CLK is fixed to SystemCoreClock, the TIM1 Prescaler is equal to 0 so the TIM1

counter clock used is SystemCoreClock (48 MHz).

The objective is to generate a PWM signal at 17.57 KHz:

•

TIM1_Period = (SystemCoreClock / 17570) - 1