4. Dma_config

4.1. Function description:

This demo shows how to use DMA with ADVANCED_TIMERn update request to transfer data from memory to ADVANCED_TIMERn capture compare register 0. ADVANCED_TIMERnCLK is fixed to systemcoreclock 8MHz, the ADVANCED_TIMERn prescaler is equal to 8.

For instance:

ADVANCED_TIMERn counter clock used is 1MHz.

The objective is to configure ADVANCED_TIMERn channel 0 to generate PWM signal with a frequency equal to 1KHz and a variable duty cycle(25%,50%,75%) that is changed by the DMA after a specific number of Update DMA request.

4.2. Test result:

The output signal as the following description:

The channel 1 duty cycle is set to 25% / %50 / %75

4.3. IO connection:

NONE

4.4. Output pad:

PAD
pad_ADVANCED_TIMERn_bkin
pad_ADVANCED_TIMERn_etr
pad_ADVANCED_TIMERn_ch1_i
pad_ADVANCED_TIMERn_ch2_i
pad_ADVANCED_TIMERn_ch3_i

Note

The ‘m’ and ‘n’ in “advtimer_timerm” and “advtimer_timern” indicate the peripheral number.