1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
| // File name: uart.c
// gcc -o uart uart.c
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <termios.h>
int main (int argc, char *argv[])
{
int ret = 0;
int len;
unsigned char buf[16] = {0xAA, 0x55, 0x00, 0xFF,
0x5A, 0xA5, 0xF0, 0x0F,
0x01, 0x02, 0x04, 0x08,
0x10, 0x20, 0x40, 0x80};
unsigned char buf_rev[16];
int fd;
FILE *fp = NULL;
int status;
struct termios tio;
if (argc <= 1) {
fprintf(stderr, "Usage: %s <dev>\n", argv[0]);
ret = 255;
goto end;
}
fp = fopen (argv[1], "w+");
if (fp == NULL) {
puts ("Fail to open device");
ret = 255;
goto end;
}
printf ("+ TX: ");
fflush (fp);
len = fwrite (buf, sizeof (char), 16, fp);
fflush (fp);
if (len < 16) {
puts ("Fail to transfer data");
ret = 255;
goto clean;
}
puts ("Pass");
printf ("+ RX: ");
len = fread (buf_rev, sizeof (char), 16, fp);
if (len < 16) {
puts ("Fail to receive data");
ret = 255;
goto clean;
} else if (memcmp (buf, buf_rev, 16) != 0) {
puts ("Check data fail");
ret = 255;
goto clean;
}
puts ("Pass");
fclose (fp);
fp = NULL;
if ( (fd = open (argv[1], O_RDWR)) < 0 ) {
puts ("Fail to open device");
ret = 255;
goto end;
}
tcgetattr(fd, &tio);
printf ("RTS -> CTS - RI: ");
status |= TIOCM_RTS;
ioctl(fd, TIOCMSET, &status);
ioctl(fd, TIOCMGET, &status);
ret = status & (TIOCM_CTS | TIOCM_RNG); // Should be 0xA0
status &= ~TIOCM_RTS;
ioctl(fd, TIOCMSET, &status);
ioctl(fd, TIOCMGET, &status);
if ( (status & (TIOCM_CTS | TIOCM_RNG)) || ret != 0xA0) { // Status should be 0x00, false
puts ("FAIL");
if (ret == 0x0)
puts (" --> Case1: RTS fail; Case2: CTR & RI fail");
else if (ret == 0x80)
puts (" --> CTS fail");
else if (ret == 0x20)
puts (" --> RI fail");
else
puts (" -> RTS fail");
ret = 6;
goto clean;
} else {
puts ("PASS");
ret = 0;
}
printf ("DTR -> DSR - DCD: ");
status |= TIOCM_DTR;
ioctl(fd, TIOCMSET, &status);
ioctl(fd, TIOCMGET, &status);
ret = status & (TIOCM_DSR | TIOCM_CAR); // Should be 0x140
status &= ~TIOCM_DTR;
ioctl(fd, TIOCMSET, &status);
ioctl(fd, TIOCMGET, &status);
if ( (status & (TIOCM_DSR | TIOCM_CAR)) || ret != 0x140) { // Status should be 0x00, false
puts ("FAIL");
if (ret == 0x0)
puts (" --> Case1: DTR fail; Case2: DSR & DCD fail");
else if (ret == 0x100)
puts (" --> DCD fail");
else if (ret == 0x40)
puts (" --> DSR fail");
else
puts (" -> RTS fail");
ret = 7;
goto clean;
} else {
puts ("PASS");
ret = 0;
}
clean:
if (fp)
fclose (fp);
if (fd > 0)
close (fd);
end:
printf("Return Code: %d\n", ret);
return ret;
}
|
