Asus Tinker board S SPI master not recieving data from slave

Question

I'm trying to program an Asus tinker board S as a SPI master, and the communication from the master to the slave microcontroller works as expected, and i am able to send data from the Asus tinker board S SPI master to the STM32f140 SPI slave. I want to be able to read the data both ways, and i've tried a few things, but none of them seem to work. I am using the WiringPi library (https://github.com/TinkerBoard/gpio_lib_c)

When i use an analog discovery to look at the connection between the two microcontrollers, the data is fine both ways - both the RX and TX data is correct, so the issue must be in reading the data on my master. My code on my tinkerboard looks like this:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>

//#include <fcntl.h>
//#include <sys/ioctl.h>
//#include <linux/spi/spidev.h>

#include <wiringPi.h>
#include <wiringPiSPI.h>
#include <wiringTB.h> 

int main()
  {
 
wiringPiSetupGpio();

//asus_set_pin_mode(257,OUTPUT); //MOSI OUT
//asus_set_pin_mode(254,OUTPUT); //CLK OUT
asus_set_pin_mode(255, OUTPUT); //CS OUT
//asus_digitalWrite(257, LOW);
//asus_digitalWrite(254, LOW);
asus_digitalWrite(255,HIGH);
asus_set_pin_mode(256,INPUT);  
 
         uint8_t b=0;
        int spimode = 3;
        int spichannel = 1;
        int spispeed = 8000000;
uint8_t i=0;
int x;


 
        int fd = wiringPiSPISetupMode(spichannel,spispeed,spimode);
 

        if(fd==-1) {
            printf("Spi fail \n");
            return -1;
        }
 
        printf("\n SPI success \n");
 

        delayMicroseconds(1000);

while(1){

        unsigned char buf[4] = {1, 9, 0, 0};
        int8_t Req_header_MOSI[4] = {1, 9, 0, 0};
        unsigned char inbuf[4];


asus_digitalWrite(255,LOW);

for(i=0;i<4;i++){
     inbuf[i] = wiringPiSPIDataRW(spichannel, &buf[i], 1);

printf("%d",inbuf[i]);

}
delayMicroseconds(100);



 delayMicroseconds(1000);

asus_digitalWrite(255,HIGH);



printf("\n");
        delayMicroseconds(1000);

 
      }
}
 

On my slave i read 1 9 0 0 , as expected, and in return im trying to send 5 6 7 8 but recieve 1 1 1 1 on the master.

Thank you in advance