When I examine the contents of “libmraa” application, there is sample code about “SPI” communication. Has anyone with a “rock pi x” development board tried these examples. and if possible, can he try these examples and give information about whether it works. I want to buy a development board for a long time and I want to make sure everything is working properly before purchasing, as a device where you can’t use gpio pins will be pointless. best regards.
Libmraa Example usage
/*
- Author: Thomas Ingleby thomas.c.ingleby@intel.com
- Contributors: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org
- Copyright © 2014 Intel Corporation.
- SPDX-License-Identifier: MIT
- Example usage: Sends data continuously to a Spi device. Press Ctrl+C to exit
*/
/* standard headers */
#include
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
/* mraa headers */
#include “mraa/common.hpp”
#include “mraa/spi.hpp”
#define SPI_PORT 0
volatile sig_atomic_t flag = 1;
void
sig_handler(int signum)
{
if (signum == SIGINT) {
std::cout << “Exiting…” << std::endl;
flag = 0;
}
}
int
main(void)
{
uint8_t data[] = { 0x00, 100 };
uint8_t rxBuf[2];
uint8_t* recv;
int i;
signal(SIGINT, sig_handler);
//! [Interesting]
mraa::Spi spi(SPI_PORT);
while (flag) {
for (i = 90; i < 130; i++) {
data[1] = i;
recv = spi.write(data, 2);
std::cout << "Writing -%i" << i << std::endl;
if (recv) {
std::cout << "RECIVED-%i-%i" << recv[0] << recv[1] << std::endl;
free(recv);
}
usleep(100000);
}
for (i = 130; i > 90; i--) {
data[1] = i;
if (spi.transfer(data, rxBuf, 2) == mraa::SUCCESS) {
std::cout << "Writing -%i" << i << std::endl;
std::cout << "RECIVED-%i-%i" << rxBuf[0] << rxBuf[1] << std::endl;
}
usleep(100000);
}
}
//! [Interesting]
return EXIT_SUCCESS;
}
spi.i.cpp lib