nrf51822: Interfacing external flash memory using SPI

RE: nrf51822: Interfacing external flash memory using SPI

Susheel Nuguru — Thu, 23 Apr 2015 09:43:50 GMT

I really appreciate you coming back and posting your progress. This practice makes this devzone more efficient. Thank you sidekick

RE: nrf51822: Interfacing external flash memory using SPI

sidekick — Wed, 22 Apr 2015 11:32:36 GMT

Thank you for your inputs. For our application, the speed is not of much importance, hence the normal SPI master-slave configuration works for us.

RE: nrf51822: Interfacing external flash memory using SPI

sidekick — Wed, 22 Apr 2015 11:29:34 GMT

I've been able to successfully write to this external NVRAM memory block as SPI slave. Hence closing this thread.

RE: nrf51822: Interfacing external flash memory using SPI

Clem Taylor — Sat, 11 Apr 2015 02:20:04 GMT

For the typical SPI flash the nrf51 is the master and the spi flash is the slave.

The nrf51 SPI slave is mostly intended for BLE serialization, where you are using the nrf51 with an external processor (which acts as the SPI master).

I'm not using the SDK SPI driver, but I am using NRF_SPI0 (spi master) to talk to both a GigaDevice GD25LQ16 2MB and a SSD1306 based OLED display. I wish the nrf51 SPI interface was lower overhead (DMA or tx/rx FIFO would be nice). The software overhead means I can't quite keep up with a 4mbit interface. For flash writes I spend more time transferring the data then doing the actual write.