I'm trying to read/write data to a camera module using the SPI interface. The slave generates a response with an arduino but not with the frdm-KL26z. I used an oscilloscope to compare the MOSIs and I found that POL and PHA were 0 in both of them. The only difference was that the Arduino has the MOSI pulled down and the KL26z has it pulled up. I'm using Processor Expert and KSDK 1.3 and I can't find a way to change where the MOSI idles for the KL26z.
Here is the Arduino SCK and MOSI (0x80, 0x55) (receives response)
In a quick attempt to validate my hypothesis, I wired the CS and and MOSI to digital inputs and output a CS XOR MOSI modified MOSI. The problem with that is that the bytes were shifted (maybe because the CPU had to process them after the original signal is sent?), but I ordered a XOR logic gate that should be here soon.
I would appreciate any suggestions on how to fix this. Although it isn't pictured, I verified that CS is pulled low for the transmission and pulled back up between transmissions. I also double checked that the slave was configured for POL 0 and PHA 0. I also made sure the frequency wasn't too high (it's set to 75khz; the slave can work with up to 8Mhz).