No-OS SW Reference design(AD9361) for Zedboard+AD-FMCOMMS2

Moved to Microcontroller no-OS driver subspace.

Hi Gan,

Software must write a 0x1 to clear a specific bit from the AXI_DMAC_REG_IRQ_PENDING register. So the function finds which bits are set (adc_dma_read(AXI_DMAC_REG_IRQ_PENDING, &reg_val)) and clears all of them (adc_dma_write(AXI_DMAC_REG_IRQ_PENDING, reg_val)).

You can find more information about this on the wiki: https://wiki.analog.com/resources/fpga/docs/hdl/regmap

Regards,

Dragos

Gan,

That one is a special register: RW1C - it can be read and its bits can be cleared by writing 1 to them. Writing 0 into that register does not have any effect.

Regards,

Dragos

Hi Dragos,

Thank you for your reply, I am still confused.

Since the bits which are set are already 0x01, why we still need the code(adc_dma_write(AXI_DMAC_REG_IRQ_PENDING, reg_val) to set them to 0x01?

and why do you mean by “write 0x01 to clear a specific bit from the AXI_DMAC_REG_IRQ_PENDING register.”?

yours,

gan

Hi Dragos,

     Thank you so much.

yours,

Gan

Hi Dragos,

I have one more question. Can we set all the bits to 0x01 directly,then we do not need to find which bits are set by

adc_dma_write(AXI_DMAC_REG_IRQ_PENDING, reg_val)?

can you still see me?

Gan,

Yes, you can also write 0x3 to register and both bits ([1] END_OF_TRANSFER, [0] START_OF_TRANSFER) will be cleared. If they are already cleared, the write has no effect.

Regards,

Dragos

Hi,Dragos

thank you for you reply.

Gan