I transmitted data with mcp2515 can bus module using arduino mega. Data transmission is working properly. I need to add a datalogger to it. I connected the Sck, Miso, Mosi pins to each other in common. I connected the cs pins separately. With the normal(big) Sd module neither worked. I have connected a micro SD module. Micro Sd worked but mcp2515 disabled. When I remove the sd card module the mcp2515 starts working. What do you think is the problem?