https://devzone.nordicsemi.com/f/nordic-q-a/3146/9bit-spi-interfaceHi, Is it possible to use SPI master on nrf51822 in 9bit mode or shall I use bitbanging? I have a slave (SSD1306) that accepts only 9bit words. Thanks, Sergeyen-USTelligent Community 13Wed, 16 Jul 2014 13:06:42 GMThttps://devzone.nordicsemi.com/thread/11637?ContentTypeID=1Wed, 16 Jul 2014 13:06:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:070785c9-e3e1-41c6-9638-bfb0d1288c2dSergy<p>Hi John, indeed im using an SD. what do you mean by &quot;radio notifications&quot;? Are there any special sd_ commands for setting and resetting GPIO?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/11636?ContentTypeID=1Wed, 16 Jul 2014 13:00:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fdbc0f2c-9fc3-416b-b003-5347ccceea6fJohn<p>There is nothing I see in the Reference Manual or Product Specification that would provide for a 9 bit mode. In fact the TX and RX registers are both shown to be 8 bits wide.</p> <p>If you do end up bit banging the interface and are using the soft device stack, you may need to take some care to avoid interference by stack when radio events occur. I.e. you may need to use radio notifications to make this work properly.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/11635?ContentTypeID=1Wed, 16 Jul 2014 12:58:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e3b9b064-06f8-4bd4-95c7-fc40a703ec33Matt Leising<p>I&#39;m fairly sure that the hardware SPI support only transfers data one byte at a time. You&#39;ll most likely have to bitbang.</p><div style="clear:both;"></div>