RX Buffer in SPI Transfer overriding tx buffer

[FHachmann04]

In the following line both tx and rx buffer are being set to the same pointer. The controller while being write only still returns something and overrides the tx buffer which will mess up subsequent calls. I think we should discard the tx buffer here
tr.rx_buf = 0;

e-Paper/RaspberryPi_JetsonNano/c/lib/Config/dev_hardware_SPI.c

Line 356 in 86aa993

tr.rx_buf = (unsigned long)buf;

[shhds]

It will not be overwritten. The e-paper has only one data cable, which means it can only perform sending or receiving at the same time and will not run simultaneously