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标题: 为树莓派 添加一个 实时时钟DS1302 [打印本页]
作者: admin 时间: 2020-7-20 22:10
标题: 为树莓派 添加一个 实时时钟DS1302
1、在系统中安装wiringPi(这个就不多说了很简单)
r. r9 A9 Z- w6 W7 x2、连接ds1302模块和树莓派引脚- `& ^/ u3 c7 S& Z a+ c: e
连接前需要在ds1302的DTA引脚上添加一个10K的上拉电阻," b% G1 x& V Y: a0 R
VCC—3.3V—-8 J9 w6 s7 r9 k4 u' W% e) n
GND—0V—-
$ t0 ~+ i6 _$ R b6 `) |CLK—SCLK—-23) w7 v; L* W' H
DTA—SDA0—-248 \' m5 g9 x: |4 w e6 C8 r
RST—CE0—–27# o* W+ m" S; N: H# J) j
3、修改程序
- Y% ?4 ^& {1 u% s" a3 l# S, Eds1302.c的mian函数里有一个ds1302setup()函数 ,用来设置引脚,修改如图:! w$ p' R4 H2 _
9 V" ]' G5 t8 @, X& [0 P/ U- int main(int argc, char *argv[])
- }+ [! [7 n7 n: Q ? - {
1 N/ F2 x% B. y: e - int i;6 G4 [! G% E7 S0 g
- int clock[8];- v- `- i+ a. Y- y( g( o8 m
- 6 m4 V6 N5 i( R: C6 ?; ]! E% z
- wiringPiSetup();
/ @- E9 I$ G# T" |) U: _' \0 v; V - //ds1308setup(0,1,2);1 F; Y: m: ]! D) \: s' x0 W
- ds1302setup(14,10,30);
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/ h* j' z7 n+ X - if(argx == 2)
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4 |2 q$ d) s4 k% N - /**/if(strcmp(argv[1],"-slc") == 0)9 i$ w$ R; o" t) Q: ]1 T
- return setLinuxClocl();8 v! d4 K4 r9 c& K/ m# o! _( p
- else if(strcmp(argv[1],"-sdsc") == 0)9 _( q4 N& M, [3 J( J, p/ h2 }# C4 V
- return setDSclock();7 h: K T/ |( ^! G5 f
- else if(strcmp(argv[1],"-rtest") == 0)" g# T$ X7 @3 W0 V1 l
- return ramTest();
8 {, `; K3 E F+ n% \% @' c - else! d. V% k& G% v" z$ y0 u2 Q+ `* |
- {
" x! s" F! \- R4 d2 N - printf("Usage:ds1302[-slc|-sdsc|-rtest]\n");
$ m5 U5 J' B2 P$ k& i - return EXIT_FAILURE;, e5 M; C9 ^# ^5 ?+ q7 t" U" F
- }
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复制代码 这里的14,10,30引脚号是wPi的编号不要弄错了4 u2 J+ \# V1 { U% r7 [
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在wiringPi/examples目录下有ds1302.c文件 在wiringPi/examples目录下执行make ds1302即可生产可执行文件ds1302
1 Z3 V+ [* o1 b1 L0 U. K, _4、测试/ |. o" d0 E2 Q% F
4.1 执行sudo ./ds1302 -rtest5 u7 |9 _: B! @- S
显示:7 J7 W6 u5 |. O" y- q- C1 c
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说明一切正常,否者请检查连接是否正确
! t% E, Q: F" y8 c4.2 sudo ./ds1302 -sdsc 即可将系统时间写进ds1302模块中去8 ]8 }' Q# P( q. `+ @ ?
4.3 从DS模块读取时间
& t9 v( i0 {3 T3 o6 G7 X执行sudo ./ds13021 y1 I% l( T9 t: L9 D" ~
8 n+ G+ T+ C- P' U& l4.4 从DS模块读取时间来设置系统的时间9 e1 \2 S- K# {7 x' x& Z; c, M
sudo ./ds1302 -slc
; f ?: _2 [& |& c& h5、获取当地时间 (以上获取的是UTC(Coordinated Universal Time)时间到当前时刻的秒数,要想从该秒数转换成本地时间需要用localtime()函数struct tm *localtime(const time_t *clock),)
* g6 q% _* O p; e修改ds1302.c中的setDSclock()函数
6 p+ V F' y% s* _; C如下:
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8 s' S( U$ X! K- I$ F3 w8 @( Q- static int setDSclock (void)
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7 L, d: M9 [" g1 @8 @ - //struct tm t ;
+ p- v. {9 w+ x! ? c( I8 ^& ~2 F - struct tm* t = NULL;
6 G' n- S2 x4 a9 ]+ E2 H" ?* ~ - time_t now ;
3 N& V# f# T6 ^' ~1 [ - int clock [8] ;
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; o* f( d! Y9 M' K/ Z" p- printf ("Setting the clock in the DS1302 from Linux time... ") ;
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: F+ W3 x+ z. j( K- Z- now = time (NULL) ;
+ T7 y6 \. V' e* S, p - //gmtime_r (&now, &t) ;% K- {7 j6 O8 J& [( ~9 W
- t = localtime(&now);# U* F5 r9 U4 E- k( s5 V( g% J
- 3 L* w4 N+ X) i1 Y% C% A; l1 K% R
- //clock [ 0] = dToBcd (t.tm_sec) ; // seconds
5 I, ~9 r$ C1 w - //clock [ 1] = dToBcd (t.tm_min) ; // mins
% X* V& W$ l. I' D$ R - //clock [ 2] = dToBcd (t.tm_hour) ; // hours
( I: L$ D# Y( {6 J; B- ? - //clock [ 3] = dToBcd (t.tm_mday) ; // date
: T2 M4 T( W/ ]* k, {( I7 K - //clock [ 4] = dToBcd (t.tm_mon + 1) ; // months 0-11 --> 1-12
, W8 o5 J8 s \' S - //clock [ 5] = dToBcd (t.tm_wday + 1) ; // weekdays (sun 0), n: J9 v0 D; E; I; G
- //clock [ 6] = dToBcd (t.tm_year - 100) ; // years G( @! H! K5 T: g K9 P. K
- //clock [ 7] = 0 ; // W-Protect off+ F0 `# @( K- A8 d' I; c$ m
- ) Z2 J- i& Q, z
- clock [ 0] = dToBcd (t->tm_sec) ; // seconds2 f% d) L. u! P8 \3 W4 R/ n4 q: y
- clock [ 1] = dToBcd (t->tm_min) ; // mins4 K4 _& s( v6 z5 q: l8 _6 d1 e3 {
- clock [ 2] = dToBcd (t->tm_hour) ; // hours% f- g# Z5 l! x: O8 I
- clock [ 3] = dToBcd (t->tm_mday) ; // date
2 a* |; {+ R" ~9 j+ X6 V - clock [ 4] = dToBcd (t->tm_mon + 1) ; // months 0-11 --> 1-12" E6 R: c# d& D/ Q- G* v% t
- clock [ 5] = dToBcd (t->tm_wday + 1) ; // weekdays (sun 0)
7 n& w, C2 y: k8 m - clock [ 6] = dToBcd (t->tm_year - 100) ; // years. i) B A; K$ u7 F+ ?! b4 x/ U/ K4 r
- clock [ 7] = 0 ; // W-Protect off
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- ds1302clockWrite (clock) ;- x: _5 }6 O; ~
0 i* ^; q( } C: B" L3 b- printf ("OK\n %2d:%02d\n %2d:%02d\n",t->tm_hour,t->tm_min,dToBcd (t->tm_hour),dToBcd (t->tm_min) ) ;
复制代码
0 {0 g6 Z1 \, D5 c之后重新编译make ds1302 重新执行以上指令即可获取当地时间了
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相关文章:树莓派4B 更新wiringPi库到2.52的方法
作者: admin 时间: 2020-7-20 23:34
如果出现报错
) p% w! d. k c, WDS1302 RAM TEST FAILURE. 433 errors.
% i/ E# L7 d4 @1 Z+ xDS1302 RAM TEST FAILURE. 465 errors.
) t) u# L' Q9 e8 F, ]等错误 那就是你接了三角 并没有接vcc和gnd接地
作者: admin 时间: 2020-7-21 00:10
VCC:模块的电源引脚,接树莓派的1号引脚(3.3V); j% d* \; q/ X s6 Q7 n
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GND:模块的地,接树莓派的6号引脚(Grand)" {- J. ~% W" `9 {1 A
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CLK:SCLK 串行时钟,接树莓派wiringPi 0(物理编号:11号)! L( s g6 W4 z9 @9 D) d2 o
5 _0 J; M+ A+ |! ?% HDAT:I/O 数据线,接树莓派wiringPi 1(物理编号:12号)+ a3 @) q' j& x9 }
7 Z# G! n, f, j$ L; ]3 aRST:复位引脚,接树莓派wiringPi 2(物理编号:13号)
作者: admin 时间: 2020-7-21 00:14
七、开机同步时间将树莓派的时间与网络同步后,就可以写入到DS1302中,这样DS1302具有准确的当前时间,就算掉电也不会丢失,在树莓派离线时,可以在每次开机时将DS1302的时间写入到树莓派中,从而使得树莓派实现了实时时钟的功能。
获得可执行文件ds1302的目录
- pi@raspberrypi:~/wiringPi/examples $ pwd
7 x" `; L- @' c3 c- G. c3 d - /home/pi/wiringPi/examples
复制代码然后修改 /etc/rc.local 文件,在exit 0前面添加时间同步命令,这样在树莓派开机时就会自动将DS1302的时间同步到树莓派上。添加以下命令:
- sudo /home/pi/wiringPi/examples/ds1302 -slc
复制代码保存后退出。我们将树莓派断网,然后树莓派关机,过一会开机,使用date命令读取时间,可以看到树莓派的走时和当前时间一致,说明时间自动同步成功!
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作者: admin 时间: 2020-7-21 00:29
解决小时无法同步问题$ {- X! g' S" T) J6 `
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- static int setDSclock (void): g( q: I" `; @9 R/ n& L$ f# L5 ~
- {5 g" U+ W% z1 Z9 m5 E( ^3 j: g
- //struct tm t ;
' O3 ]8 a8 N, s2 W - struct tm* t = NULL;
( G8 i3 I5 v6 [ - time_t now ;4 B! L4 I+ q$ X
- int clock [8] ;" N+ v" d. @1 x" w. s+ z: M
6 V. e2 _% C$ F2 }- printf ("Setting the clock in the DS1302 from Linux time... ") ;7 K4 t3 y( X/ P+ d; G8 W
- $ O. I! K1 T: X3 X9 C3 O
- now = time (NULL) ;$ Q% y6 }7 R4 k' ]
- //gmtime_r (&now, &t) ;
. e K5 w; d! O5 m# Y) }( w - t = localtime(&now);4 `% r8 ^, m) f- d7 l
- ( K; j2 q+ x9 P+ k% c
- //clock [ 0] = dToBcd (t.tm_sec) ; // seconds
9 J% E9 S5 ]' m) @* f2 S - //clock [ 1] = dToBcd (t.tm_min) ; // mins9 r4 J5 ^: S6 b/ T
- //clock [ 2] = dToBcd (t.tm_hour) ; // hours
, l. f! a/ S1 v2 | - //clock [ 3] = dToBcd (t.tm_mday) ; // date u( p; {7 Q, H8 X+ |; v5 ^
- //clock [ 4] = dToBcd (t.tm_mon + 1) ; // months 0-11 --> 1-12
* x, l- V* k2 T7 A% X - //clock [ 5] = dToBcd (t.tm_wday + 1) ; // weekdays (sun 0)2 e! x) m$ l6 I+ q& F7 j
- //clock [ 6] = dToBcd (t.tm_year - 100) ; // years
* r* w/ P6 d4 {! `* \0 X6 Q/ E - //clock [ 7] = 0 ; // W-Protect off( i9 A# P$ J' D7 s
-
9 i- S' T! W. R1 a - clock [ 0] = dToBcd (t->tm_sec) ; // seconds1 B# C' |( M0 w* M' f* t/ ~, L* _! F
- clock [ 1] = dToBcd (t->tm_min) ; // mins
! R# o! M8 e9 v+ t0 B6 n - clock [ 2] = dToBcd (t->tm_hour) ; // hours
1 P( V& z" \0 U0 ^# r - clock [ 3] = dToBcd (t->tm_mday) ; // date0 B1 W3 W4 \4 A1 J2 C& [! z& H
- clock [ 4] = dToBcd (t->tm_mon + 1) ; // months 0-11 --> 1-12* ]5 m; D5 P4 D6 u+ f# G# n
- clock [ 5] = dToBcd (t->tm_wday + 1) ; // weekdays (sun 0)
) S: j. v% I% V3 j6 H# a - clock [ 6] = dToBcd (t->tm_year - 100) ; // years
- M, y0 w8 ^' {/ n$ ~. U - clock [ 7] = 0 ; // W-Protect off) W& |9 O" N7 ?+ Q+ l8 \
: {. T; w1 t' {5 G5 O- ~- ds1302clockWrite (clock) ;
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- printf ("OK\n %2d:%02d\n %2d:%02d\n",t->tm_hour,t->tm_min,dToBcd (t->tm_hour),dToBcd (t->tm_min) ) ;
复制代码
作者: admin 时间: 2020-7-21 15:21
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作者: admin 时间: 2020-7-21 15:27
gpio readall 调出接口图
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4 I6 b3 R4 Z; q- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+7 j3 A {# t% P' s& j7 N
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |" D7 ^) L+ i6 B! i0 t9 E e3 G
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
# x/ d( ]" g i - | | | 3.3v | | | 1 || 2 | | | 5v | | |
. k5 X) |% {! g8 {2 K2 Q% Q* d - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |9 `' L; p" J6 }" E
- | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |: @% u' Q1 { @$ h. T
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |' c2 x N7 H' ^
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
3 {- i$ ^. M9 C$ i' v - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
7 T7 J; |/ S% E( J5 b - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |) r3 A/ v6 U2 ~7 B4 L" p0 f; Q, i
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
, ^: f2 A1 x! C5 G0 V - | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
4 o u: L& q0 D# b9 f - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |! K7 x! B2 r+ }; y$ h
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
% H3 r5 b. j0 c- y - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
( b7 F# l3 f! A/ x! s* y- _ - | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
. C% }; K5 K. {2 Z$ W5 _8 Z - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
0 a& K$ K) _9 d& B - | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |2 V3 R, P; U( U9 D* [0 `7 N' L% k) O# G
- | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
1 ]/ [. i: |4 O! U% g2 O - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
; f! o" M' J( F$ f! d - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
& ~+ h4 P7 ~2 f' Z - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |. A; [2 E! K- Z+ [& }
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
6 I, ]2 n' ]" Q u - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+/ t t- N+ X8 |/ ^! c' Q$ ]2 ^
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
& t) R- H1 H& X$ ^9 I - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
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复制代码
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