SparkFun Electronics Forum

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <string.h>
#include <errno.h>

#include <mraa.h>

void* handling_uart(void *arg) {
	unsigned char rbuffer[256];
	int *uart0 = (int *)arg;

	errno = 0;
	pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);

	while(1) {
		pthread_testcancel();

		printf("going to try and read\n");
		read((*uart0), rbuffer, 256);
		memset(rbuffer, 0, 256);
		printf("\n read() %s\n", rbuffer);

		printf("read done. \r\n");
	}
}


int main(void) {
	mraa_uart_context uart_i;
	uart_i = mraa_uart_init(0);

	// not sure what mraa_uart_init is doing
	if(uart_i == NULL) {
		printf("failed to find uart\n");
	}

	int uart0 = -1;
	pthread_t thread;
	int ret, status;
	char serial_port[] = "/dev/ttyMFD1";

	uart0 = open(serial_port, O_RDWR, O_NONBLOCK);

	if(uart0 == -1) {
		printf("\n open() failed with error [%s]\n", strerror(errno));
		return -1;
	}

	struct termios options;
	tcgetattr(uart0, &options);

	cfsetispeed(&options, B57600);
	cfsetospeed(&options, B57600);

	options.c_cflag &= ~PARENB;
	options.c_cflag &= ~CSTOPB;
	options.c_cflag &= ~CSIZE;
	options.c_cflag |= CS8;

	options.c_cc[VTIME] = 0;
	options.c_cc[VMIN] = 0;
	options.c_lflag |= ICANON;

	tcflush(uart0, TCIFLUSH);
	tcsetattr(uart0, TCSANOW, &options);

	ret = pthread_create(&thread, NULL, handling_uart, &uart0);
	if(ret) {
		printf("\n pthread create failed with error [%s]\n", strerror(errno));
		return -1;
	}

	char c = getchar();
	status = pthread_cancel(thread);
	if(status) {
		printf("\n pthread cancel failed with error [%s]\n", strerror(errno));
		return -1;
	}

	close(uart0);

	return 0;
}