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AN2841 bảng dữ liệu(PDF) 17 Page - STMicroelectronics

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AN2841 bảng dữ liệu(HTML) 17 Page - STMicroelectronics

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AN2841
Dimming application using an STM32 microcontroller
17/31
3.1.5
Interrupt + DMA + interrupt
Figure 14 shows that data from the previous transfer is latched during the current timer
interrupt which causes several problems. The algorithm is more complicated in this case.
A slightly different approach that has no impact on the system can be used: it is obtained by
generating the LE pulse when the DMA transfer is complete instead of generating it on
a timer interrupt. The LE pulse is generated at the DMA transfer complete interrupt as
shown in Figure 15.
Figure 15.
Timer interrupt + DMA transfer + DMA interrupt
Figure 16 shows the waveform of the outbound signals from the microcontrollers controlling
the LED drivers. An example of the C code implementation of the timer routine is given
below. A detailed description follows the example.



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