eren-terzioglu commented on issue #13855:
URL: https://github.com/apache/nuttx/issues/13855#issuecomment-2411582761
> Hello @eren-terzioglu
>
> below you can see an example:
>
> ```
> #include <nuttx/config.h>
> #include <stdio.h>
> #include <fcntl.h>
> #include <unistd.h>
> #include <errno.h>
> #include <string.h>
> #include <stdlib.h>
>
>
/****************************************************************************
> * Public Functions
>
****************************************************************************/
>
> #define MASTER 0
>
> #ifdef MASTER
> #define SOURCE_FILE "/dev/spi2"
> #else
> #define SOURCE_FILE "/dev/spislv2"
> #endif
> #define BUFFER_SIZE 256
>
>
/****************************************************************************
> * hello_slave_main
>
****************************************************************************/
>
> int main(int argc, FAR char *argv[])
> {
> int fd;
> char buffer[BUFFER_SIZE];
> ssize_t bytes_read;
>
> printf("Slave started!!\n");
> fd = open(SOURCE_FILE, O_RDWR);
>
> if (fd < 0)
> {
> printf("Failed to open %s: %s\n", SOURCE_FILE, strerror(errno));
> return 0;
> }
>
> while(1)
> {
> // Read the number from the source file
> printf("Slave: Reading from %s\n", SOURCE_FILE);
> bytes_read = read(fd, buffer, BUFFER_SIZE - 1);
>
> if (bytes_read < 0)
> {
> printf("Failed to read from %s: %s\n", SOURCE_FILE,
strerror(errno));
> close(fd);
> return 0;
> }
> else if (bytes_read > 0)
> {
> buffer[bytes_read] = '\0';
> printf("Slave: Read value '%s' from %s\n", buffer, SOURCE_FILE);
>
> // Write the same value back
> printf("Slave: Writing value '%s' back to %s\n", buffer,
SOURCE_FILE);
> if (write(fd, buffer, strlen(buffer)) < 0)
> {
> printf("Failed to write to %s: %s\n", SOURCE_FILE,
strerror(errno));
> close(fd);
> return 0;
> }
> }
>
> sleep(1);
> }
>
> close(fd);
> return 0;
> }
> ```
>
> In this example I am always answer empty buffer to master, but you will
see that the master will print data. If you have one available, please use a
logic analyzer.
Thanks, I am checking with a logic analyzer too.
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