nrf52832 waveshare e-paper display spi driver help

[karinca]

Hi,

we are trying to use waveshare 2.9 epaper display with nrf52832, converted stm32 sample code to nrf52 with no luck. It seems we can not send command and data correctly to the display, it is not responding back via Busy line and program hangs on while loop. Can anybody help about this? We are using sdk 15's spi example with segger embedded studio.

I attached the code.spi.zip

[PopePepeTheFirst]

In the reset function decrease delay to 2ms and run the code... I was stuck in the while loop(busy was giving me 0 in oscilloscope) and decreasing reset duration(active low) to 2 ms solved mine(basically use the same delay in example esp32 or stm code). I dont know why it happens like that..

[JoWi]

Hi, it seems e-paper-drivers vary with with almost each production lot. finally For me "partial refresh" was important. I ended in contacting a manufacturer directly. I used displays from "good-display.com". They have a good support, but in any case: buy enough displays if you wrote the driver, because re-ordering the same model is often difficult, although bus/mechanics are same. Hence: firmware updates on the HW is indispensable. (my device: Github -> Joembedded ) Best regards, Jo