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/**
* @file test_uart_loopback.c
* Tests the uart outputs
*
*/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <debug.h>
#include <arch/board/board.h>
#include "tests.h"
#include <math.h>
#include <float.h>
int test_uart_loopback(int argc, char *argv[])
{
int uart5_nread = 0;
int uart2_nread = 0;
int uart5_nwrite = 0;
int uart2_nwrite = 0;
/* opening stdout */
int stdout_fd = 1;
int uart2 = open("/dev/ttyS1", O_RDWR | O_NONBLOCK | O_NOCTTY);
int uart5 = open("/dev/ttyS2", O_RDWR | O_NONBLOCK | O_NOCTTY);
if (uart2 < 0) {
printf("ERROR opening UART2, aborting..\n");
return uart2;
}
if (uart5 < 0) {
printf("ERROR opening UART5, aborting..\n");
exit(uart5);
}
uint8_t sample_stdout_fd[] = {'C', 'O', 'U', 'N', 'T', ' ', '#', '\n'};
uint8_t sample_uart2[] = {'C', 'O', 'U', 'N', 'T', ' ', '#', 0};
uint8_t sample_uart5[] = {'C', 'O', 'U', 'N', 'T', ' ', '#', 0};
int i, r;
for (i = 0; i < 1000; i++) {
// printf("TEST #%d\n",i);
write(stdout_fd, sample_stdout_fd, sizeof(sample_stdout_fd));
/* uart2 -> uart5 */
r = write(uart2, sample_uart2, sizeof(sample_uart2));
if (r > 0) {
uart2_nwrite += r;
}
// printf("TEST #%d\n",i);
write(stdout_fd, sample_stdout_fd, sizeof(sample_stdout_fd));
/* uart2 -> uart5 */
r = write(uart5, sample_uart5, sizeof(sample_uart5));
if (r > 0) {
uart5_nwrite += r;
}
// printf("TEST #%d\n",i);
write(stdout_fd, sample_stdout_fd, sizeof(sample_stdout_fd));
/* try to read back values */
do {
r = read(uart5, sample_uart2, sizeof(sample_uart2));
if (r > 0) {
uart5_nread += r;
}
} while (r > 0);
// printf("TEST #%d\n",i);
write(stdout_fd, sample_stdout_fd, sizeof(sample_stdout_fd));
do {
r = read(uart2, sample_uart5, sizeof(sample_uart5));
if (r > 0) {
uart2_nread += r;
}
} while (r > 0);
// printf("TEST #%d\n",i);
// write(stdout_fd, sample_stdout_fd, sizeof(sample_uart5));
}
for (i = 0; i < 200000; i++) {
/* try to read back values */
r = read(uart5, sample_uart2, sizeof(sample_uart2));
if (r > 0) {
uart5_nread += r;
}
r = read(uart2, sample_uart5, sizeof(sample_uart5));
if (r > 0) {
uart2_nread += r;
}
if ((uart2_nread == uart2_nwrite) && (uart5_nread == uart5_nwrite)) {
break;
}
}
close(stdout_fd);
close(uart2);
close(uart5);
printf("uart2_nwrite %d\n", uart2_nwrite);
printf("uart5_nwrite %d\n", uart5_nwrite);
printf("uart2_nread %d\n", uart2_nread);
printf("uart5_nread %d\n", uart5_nread);
return 0;
}