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
|
/*
* This file is used to read the battery voltage level.
* and print this level,print the battery Capacity level.
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#define uchar unsigned char
#define uint unsigned int
/* the unit is mV */
#define BATTERY_LEVEL_FULL 418
#define BATTERY_LEVEL_NORMAL 368
#define BATTERY_LEVEL_LOW 325
#define BATTERY_LEVEL_DEAD 320
#define BATTERY_LEVEL_NORMAL_PERCENT 90
#define BATTERY_LEVEL_LOW_PERCENT 9
#define BATTERY_LEVEL_DEAD_PERCENT 1
char path[] = "/sys/devices/platform/pmic_ccsm/battery_level";
uchar asc2hex(char asccode)
{
uchar ret;
if ('0'<=asccode && asccode<='9')
ret=asccode-'0';
else if ('a'<=asccode && asccode<='f')
ret=asccode-'a'+10;
else if ('A'<=asccode && asccode<='F')
ret=asccode-'A'+10;
else
ret=0;
return ret;
}
void ascs2hex(uchar *hex,uchar *ascs,int srclen)
{
uchar l4,h4;
int i,lenstr;
lenstr = srclen;
if ((lenstr == 0) || (lenstr%2)) {
return;
}
for (i = 0; i < lenstr; i+=2) {
h4 = asc2hex(ascs[i]);
l4 = asc2hex(ascs[i+1]);
hex[i/2] = (h4<<4)+l4;
}
}
void check_battery_level(int level)
{
long buf1, buf2;
if (level > BATTERY_LEVEL_FULL) {
printf("Battery level = 100%\n");
} else if (level > BATTERY_LEVEL_NORMAL) {
buf1 = level - BATTERY_LEVEL_NORMAL;
buf1 *= BATTERY_LEVEL_NORMAL_PERCENT;
buf2 = BATTERY_LEVEL_FULL - BATTERY_LEVEL_NORMAL;
buf1 /= buf2;
buf1 += BATTERY_LEVEL_LOW_PERCENT;
printf("Battery level = %d%\n", buf1);
} else if (level > BATTERY_LEVEL_LOW) {
buf1 = level - BATTERY_LEVEL_LOW;
buf1 *= BATTERY_LEVEL_LOW_PERCENT;
buf2 = BATTERY_LEVEL_NORMAL - BATTERY_LEVEL_LOW;
buf1 /= buf2;
buf1 += BATTERY_LEVEL_DEAD_PERCENT;
printf("Battery level = %d%\n", buf1);
} else {
printf("Battery level = %d%\n", BATTERY_LEVEL_DEAD_PERCENT);
}
}
int main(void)
{
int fd;
int err;
int buff1;
int battery_level;
uchar read_voltage[6] = {0};
uchar voltage_buf[4] = {0};
fd = open(path, O_RDONLY);
if (fd == -1) {
printf("failed to open file");
exit(-1);
}
err = read(fd, read_voltage, 5);
if (err == 0)
{
printf("read null\n");
}
ascs2hex(voltage_buf, &read_voltage[2], 4);
battery_level = voltage_buf[0];
battery_level *= 0x10;
buff1 = voltage_buf[1] >> 4;
battery_level += buff1;
printf("Battery Voltage = %d mV\n", battery_level*10);
check_battery_level(battery_level);
close(fd);
return 0;
}
|
