We have a product based on the nRF52840 which uses the GC9A01 display driven using SPI on battery power. The device also functions as a Bluetooth connectable so it is normally advertising data at a 1 second interval. If the display is left on for several hours while BLE is enabled, the display will randomly become glitched and stays this way until reset. It appears that the BLE is somehow interfering with SPI and causing corrupt data eventually. We are fairly confident that the issue is not hardware related, as we have eliminated noise using stable power supplies and impedance matching the SPI lines.
Is it possible that the nRF is low on resources and corrupting the SPI data or display buffer when using BLE?
The pin-out for the display is as follows.
- DC - P0.06
- CS - P0.08
- RESET - P0.11
- SDA - P0.12
- SCL - P1.09
We are using nRF Connect SDK v2.5.1.