Hi,all:
I got the No-OS SW reference design from website. in the function adc_capture() of "adc_core.c" file.
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| adc_dma_read(AXI_DMAC_REG_IRQ_PENDING, ®_val); | |
| adc_dma_write(AXI_DMAC_REG_IRQ_PENDING, reg_val); |
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my question is:
why it reads value from register into reg_val and then immediately write reg_val to register.
is register value always equal to reg_val before reg_val written back to the register? if yes,why reg_val needs to be written back to the register. if no, in what cases they are different.
thanks,
gan
