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README.txt
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/*
* u8g2 Demo Application running on Nordic Semiconductors nRF52 DK with nRF SDK 17.02 and:
*
* - TWIM and a Waveshield SH1106 OLED 128x64 display
* or
* - SPIM and a Waveshield SSD1327 OLED 128x128 16 grey level display
* that can be found on Ebay/Amazon for few EUR.
*
* Created 20200102 by @daubsi, based on the great u8g2 library https://github.com/olikraus/u8g2
* Probably not the cleanest code but it works :-D
*
* TWI: Set up with i2c/TWIM in 400 kHz (100 kHz works equally well) in non-blocking mode
* SPI: Setup up in SPIM with 4 MHz in non-blocking mode
*
* Wiring TWI:
* Connect VCC and GND of the display with VDD and GND on the nRF52 DK
* Connect SCL to pin 27 ("P0.27") and SDA to pin 26 ("P0.26") on the nRF52 DK
*
* Wiring SPI:
* Connect VCC and GND of the diplay with VDD and GND on the NRF52 DK
* Connect CLK (yellow wire) to pin 27 ("P0.27") and DIN (blue wire) to pin 26 ("P0.26") on the nRF52 DK
* Connect CS (orange wire) to pin 12 ("P0.12") and DC (green wire) to pin 11 ("P0.11") on the nRF52 DK
* Connect Reset (white wire) to pin 31 ("P0.31") on the nRF52 DK
*
* Settings in sdk_config.h
*
* TWI:
* #define NRFX_TWIM_ENABLED 1
* #define NRFX_TWIM0_ENABLED 1
* #define NRFX_TWIM1_ENABLED 0
* #define NRFX_TWIM_DEFAULT_CONFIG_FREQUENCY 104857600
* #define NRFX_TWIM_DEFAULT_CONFIG_HOLD_BUS_UNINIT 0
* #define TWI_ENABLED 1
* #define TWI_DEFAULT_CONFIG_FREQUENCY 104857600
* #define TWI_DEFAULT_CONFIG_CLR_BUS_INIT 0
* #define TWI_DEFAULT_CONFIG_HOLD_BUS_UNINIT 0
* #define TWI0_ENABLED 1
* #define TWI0_USE_EASY_DMA 1
* #define TWI1_ENABLED 0
* #define TWI1_USE_EASY_DMA 1
*
* SWI:
* #define NRFX_SPIM_ENABLED 1
* #define NRFX_SPIM0_ENABLED 0
* #define NRFX_SPIM1_ENABLED 1
* #define NRFX_SPIM_EXTENDED_ENABLED 0 // Only available on NRF52840 on SPIM3
* #define NRFX_SPIM_MISO_PULL_CFG 1
* #define NRFX_SPIM_DEFAULT_CONFIG_IRQ_PRIORITY 6
*
* Probably most of those configs are not needed apart from TWI_ENABLED and TWI0_ENABLED but I kept them there
*
* When compiling for SPI (== #define USE_SPI 1) and TWI (== #define USE_TWI 1) at the same time, make sure, that you use different
* HW resources, e.g. TWI_INSTANCE_ID = 0 and SPI_INSTANCE_ID = 1 (and the corresponding TWI0_ENABLED 1, SPIM1_ENABLED 1 in sdk_config.h
* Otherwise there vill be linker conflicts when using the same id.
* https://devzone.nordicsemi.com/f/nordic-q-a/35182/irq-handler-compile-error
*
* The u8g2 sources have to be unpacked and the csrc subfolder of that archive should be placed in the main directory of this project in a folder u8g2.
*/