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STM32 circular BDMA - single buffer
related to issue #702
The purpose of this PR is to allow Peripheral->Mem transfer using circular BDMA in the embassy-stm32 DMA library.
The new method start_circular_read()
fulfill this purpose.
As a first implementation of this new method, the read_continuous()
method has been developped in the adc f1 library (stm32f103) and a new example has been developed in the stm32f1 example directory (adc_dma.rs)