DMA with multple variable

[xkamail]

 

I have three variables:

volatile uint16_t a[20000];

volatile uint16_t b[20000];

volatile uint16_t c[20000];

 

However, I only have one DMA channel.

Can I use the DMA to transfer these three variables together in circular mode?

starting with the first 10,000 items of each 3 variable, so the total items will be 30,000

currently: 
HAL_DMA_Start(&hdma_tim8_com, (uint8_t*)xxx, &dst, 30000);

[Tesla DeLorean]

>>Can I use the DMA to transfer these three variables together in circular mode?

No, it's also not going to interleave.

Perhaps use a STRUCTURE or multi-dimensional ARRAY

3 ARRAYs will need 3 TRIGGERS, and 3 DMA CHANNELS

Also volatile isn't on it's own sufficient. You must still manage Cache Coherency, DMA data doesn't update content of the MCU's cache, it's not bus sniffing.