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I have an SPI slave connected to Due which I send into sleep mode. During sleep, I need to pull all pins low, including MOSI. What's the best way to pull the SPI-4 pin low on a Due?

Here's a similar question but it's about an AVR chip and the answer obviously doesn't apply to SAM3X8 which is an ARM.

I have an SPI slave connected to Due. I send the SPI slave into sleep mode. During sleep, I need to pull all pins low, including MOSI. What's the best way to pull the SPI-4 pin low on a Due?

Here's a similar question but it's about an AVR chip and the answer obviously doesn't apply to SAM3X8 which is an ARM.