topic Re: How to use 8-bit buffer for QN9080 DMA in Wireless MCU

How to use 8-bit buffer for QN9080 DMA

rickdickerson — Mon, 23 Jul 2018 12:57:36 GMT

Hello. I am working with the DMA SPI SDK example for the QN9080. The spi dma transfer example uses a 32 bit buffer for the slave's transmit and receive buffers even though the data width is only 8 bits. I have the same code working in my project, but I would prefer to use 8 bit buffers to preserve memory. Is it possible to use 8 bit buffers for the DMA spi or are 32 bit buffers required?

Re: How to use 8-bit buffer for QN9080 DMA

Alexis_A — Fri, 17 Aug 2018 17:26:34 GMT

Hi Rick Dickerson,

Unfortunately the driver example only works with 32-bits because the SPI FIFO works with that word length.

Sorry for the inconveniance this may cause you.

Best Regards

Alexis Andalon