My source code as follows.

#include <stdio.h>
#include </root/test/spi-gpio-driver/include/onion-spi.h>

void SpiReadValue(int addr);

int main() {
SpiReadValue(0x40);
return 0;
}

This code would be transfer a data that 0x40. but, received data is actually 0xC0.
so, I wonder that why data receive as 0xC0.
0x00~0x3F and 0xC0~0xFF data receive correctly.
but, [transfer data] [receive data]
　　　0x40　　　　　　0xC0
　　　0x50　　　　　　0xD0
　　　0x60　　　　　　0xE0
　　　0x70　　　　　　0xF0
　　　0x80　　　　　　0x00
　　　0x90　　　　　　0x10
　　　0xA0　　　　　　0x20
　　　0xB0　　　　　　0x30

I can not understand. why happen this problem? I need your help.

SPI problem quite critical.
https://onion.freshdesk.com/support/solutions/articles/24000014450-spi-issue-resolution

@Chris-Stratton

Thanks for your answer.
I found some people that got same problem.
link as follows.
https://community.onion.io/topic/2345/omega2-spi-first-bit-missing-wrong
https://community.onion.io/topic/2027/help-about-spi-of-omega2
SPI communication problem not fixed.

@Max-Peng
Are you fixed this problem?? I got same problem..

My source code as follows.

#include <stdio.h>
#include </root/test/spi-gpio-driver/include/onion-spi.h>

void SpiReadValue(int addr);

int main() {
SpiReadValue(0x40);
return 0;
}

This code would be transfer a data that 0x40. but, received data is actually 0xC0.
so, I wonder that why data receive as 0xC0.
0x00~0x3F and 0xC0~0xFF data receive correctly.
but, [transfer data] [receive data]
　　　0x40　　　　　　0xC0
　　　0x50　　　　　　0xD0
　　　0x60　　　　　　0xE0
　　　0x70　　　　　　0xF0
　　　0x80　　　　　　0x00
　　　0x90　　　　　　0x10
　　　0xA0　　　　　　0x20
　　　0xB0　　　　　　0x30

I can not understand. why happen this problem? I need your help.

I have a problem in I2C communication. my development machine is Omega2+. I compared with LPC1768 to solve problem. Fig.1 can operate normally as I2C. This device is LPC1768.
but Fig.2 can not operate. This device is Omega2+. I got no Idea. I tried in C library and Python library. I'm still got same problem.
I need your help.