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STM32F205RBT6 dma queries

Question asked by A2 on Jun 12, 2014
1. On page 32 of AN4031 by ST, it says that peripheral should be enable only after DMA stream enabled.

I have multiple tx & rx on SPI. Like send 2 bytes & then receive 2 byes. Then send 3 bytes & rx 3 bytes & this process has 30 such tx & rx.
Does that mean everytime after each tx/ex I disable SPI & reconfigure DMA ( as no of bytes vary) & reenable SPI again?

Is it suitable for low power application to enable/reenable peripherals in consecutive transactions or do it without DMA then semd CPU to sleep mode?