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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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AN2841 Fiches technique(PDF) 16 Page - STMicroelectronics |
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AN2841 Fiches technique(HTML) 16 Page - STMicroelectronics |
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16 / 31 page  Dimming application using an STM32 microcontroller AN2841 16/31 3.1.4 Single interrupt with DMA The data is transferred from the microcontroller RAM into the LED driver using a single interrupt with DMA approach. You cannot use a DMA approach without a timer, because you cannot change the speed of the DMA and thus you cannot change PWM parameters and the refresh rate in required steps. The benefit of using DMA is that the SPI buffer can be automatically filled. The time saved is nearly in the range of the time needed for the DMA to restart and re-configure itself for the next transfer (in comparison to previous approach). An example of a timing diagram for this programming model is shown in Figure 14. The timing can be compared in Figure 12 and Figure 14. Figure 14. Timing diagram: Single interrupt with DMA |
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