Fix DMA IRQ issue for bidirectional DMA transfer #580
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By reading the code, this seems to be a bug, caused by a typo. The function `check_irq0()` seems to be intended to check `irq0` for both channels. But for channel 1, it is set to check `irq1`.
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By reading the code, this seems to be a bug, caused by a typo. The function
check_irq0()seems to be intended to checkirq0for both channels. But for channel 1, it is set to checkirq1.The corresponding function
check_irq1()does checkirq1for both channels.