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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)
2 h# r% n5 t3 Y P2、连接ds1302模块和树莓派引脚
8 g. | l' _( }7 H; l连接前需要在ds1302的DTA引脚上添加一个10K的上拉电阻,
& H& H1 ?& Q6 T0 U9 q' }VCC—3.3V—-* i; w1 C6 V6 }# ~% _& S* M c
GND—0V—-# D2 Q2 Y3 y5 a J% W3 W* m- r
CLK—SCLK—-237 F9 l- q7 J2 K& o2 G/ d4 i/ e
DTA—SDA0—-245 a, d5 ~* Z: m& w
RST—CE0—–27, u% k9 W: U) K
3、修改程序* d4 I ?+ z4 d9 D
ds1302.c的mian函数里有一个ds1302setup()函数 ,用来设置引脚,修改如图:$ b6 E; H" v2 D: F. i
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- int main(int argc, char *argv[])* u' l2 `, x2 h, O+ H7 e9 u
- {
* z$ f* D$ a! O. h% q. M6 a0 A - int i;' r8 d( y( e7 ]1 P; a
- int clock[8];
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- wiringPiSetup();
8 F. b4 s3 T; j% K. x - //ds1308setup(0,1,2);! c* e( t0 h1 I
- ds1302setup(14,10,30);/ y$ X& B5 [7 z! e7 ?/ K
- ' [- B+ Z0 B- d: K5 v: k/ t
- if(argx == 2)4 s9 V8 j$ [- n+ l
- {
9 N8 a) U- a8 x' e h$ l) a - /**/if(strcmp(argv[1],"-slc") == 0)$ d k! Z9 T( x
- return setLinuxClocl();8 H; r$ G a% f
- else if(strcmp(argv[1],"-sdsc") == 0)
/ Y( p2 k9 Z; j: ?0 _2 V - return setDSclock();! ^& F8 f F8 Y: i& y/ _( _3 C
- else if(strcmp(argv[1],"-rtest") == 0)
% d, A1 l/ U9 X% ?+ m& s - return ramTest();0 t# \# h! B4 Y/ |+ F& N
- else
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- printf("Usage:ds1302[-slc|-sdsc|-rtest]\n");
7 @' j3 @4 n! d9 z - return EXIT_FAILURE;
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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
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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ds13029 |9 @; v: r0 x( {, U$ N& f) j
4、测试
8 V! d1 M. |1 ` m$ Q( w* v% d4.1 执行sudo ./ds1302 -rtest9 o Y3 E0 g- Q1 U
显示:
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7 A- ?4 G' k% _说明一切正常,否者请检查连接是否正确. {' x- G, M; u- f* [/ @
4.2 sudo ./ds1302 -sdsc 即可将系统时间写进ds1302模块中去+ a8 e1 M' I: N$ [$ y! r
4.3 从DS模块读取时间+ c( U8 U. V) ^: K2 F5 D
执行sudo ./ds13020 p8 @8 L4 A8 j6 M; C- g1 e
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4.4 从DS模块读取时间来设置系统的时间* a# o' B2 x7 @- }
sudo ./ds1302 -slc
! X. A' d5 P; o$ c5、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),)
" z+ N* M$ G- O( [0 g I j修改ds1302.c中的setDSclock()函数
. J% o5 D+ ?& v- P9 G+ H h如下:" r$ E5 Z2 D: p+ H$ O9 @
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- static int setDSclock (void)7 n: W' K% E9 H5 v- Y
- {2 X6 l7 ^; _+ L. u
- //struct tm t ;
6 v2 M5 z7 E1 F, y; G7 Y - struct tm* t = NULL;* I! _5 G' q5 I
- time_t now ;
6 i' @6 W! z; B; P! X& z' t8 H" n4 s - int clock [8] ;2 t2 Z0 ^: ?1 a$ G
- 3 k$ v+ O3 h- ?* ~- _0 B* ]
- printf ("Setting the clock in the DS1302 from Linux time... ") ;3 _- l5 z1 i8 J9 a
. {2 x$ R: d( Q) }, S4 ^- now = time (NULL) ;/ s$ Q0 v/ H( n) q1 D, {3 E, _
- //gmtime_r (&now, &t) ;. s E5 @8 y; k
- t = localtime(&now);
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, P0 x* d/ `3 I5 H+ w' z) V& B - //clock [ 0] = dToBcd (t.tm_sec) ; // seconds
3 Y3 R: m9 j$ |9 B - //clock [ 1] = dToBcd (t.tm_min) ; // mins
) }( f/ H7 v4 R - //clock [ 2] = dToBcd (t.tm_hour) ; // hours
0 d! Y y' F0 Z# j5 M+ ~ - //clock [ 3] = dToBcd (t.tm_mday) ; // date% J+ `- |. M3 ?. k) ]- T
- //clock [ 4] = dToBcd (t.tm_mon + 1) ; // months 0-11 --> 1-12: D0 a+ x; W) M& x; `' R" U
- //clock [ 5] = dToBcd (t.tm_wday + 1) ; // weekdays (sun 0)
( |; H4 z( Q3 H+ y' | - //clock [ 6] = dToBcd (t.tm_year - 100) ; // years
/ G4 a" a. L- w2 K3 C - //clock [ 7] = 0 ; // W-Protect off& ~1 g8 k4 N3 ^" f
-
( S5 o! ~/ U: }: W" C8 I - clock [ 0] = dToBcd (t->tm_sec) ; // seconds+ `, _; k) F4 A$ f9 D
- clock [ 1] = dToBcd (t->tm_min) ; // mins! \6 x/ I8 ~, U# L' `' d- S! f
- clock [ 2] = dToBcd (t->tm_hour) ; // hours2 j. B0 R: v( v# N' W
- clock [ 3] = dToBcd (t->tm_mday) ; // date4 L% c' Q- A; Z
- clock [ 4] = dToBcd (t->tm_mon + 1) ; // months 0-11 --> 1-12
) ?2 h1 r+ N# @3 R* Q. y h - clock [ 5] = dToBcd (t->tm_wday + 1) ; // weekdays (sun 0)
, y! y; b$ Z& I5 O6 T. E - clock [ 6] = dToBcd (t->tm_year - 100) ; // years' U _2 `: M9 h; P% Q1 {
- clock [ 7] = 0 ; // W-Protect off
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" u; x) ?* `( t; e( x+ a- ds1302clockWrite (clock) ;- {, r/ w4 ^+ f- f* s# X
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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 & _- q g7 L$ i9 u' ~ S- @, y; l
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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) u5 p% s; r$ D2 ?) V8 i6 b1 B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 # V9 R: r" R; R I) ~
DS1302 RAM TEST FAILURE. 433 errors.' J9 o/ n. O9 [+ E" F% k: m
DS1302 RAM TEST FAILURE. 465 errors.- W% U3 i9 c* Y; ?' V
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); u# M2 F3 Y; L8 M( K
, s; q! n; k+ yGND:模块的地,接树莓派的6号引脚(Grand)4 X9 n0 l( @/ @, }
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CLK:SCLK 串行时钟,接树莓派wiringPi 0(物理编号:11号)
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1 R& ]1 G( Z* q) k& {/ Y a7 ]DAT:I/O 数据线,接树莓派wiringPi 1(物理编号:12号)9 Q2 {0 ] _6 @! j
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RST: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 $ pwd9 t0 \, N0 ~7 w! K
- /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
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- static int setDSclock (void)% g* L6 B" [% I, d4 u
- {
6 F6 d1 Y" J7 f# G1 D* L: y - //struct tm t ;
; j: N5 y# D; q - struct tm* t = NULL;% M$ ?- w% s4 H6 N8 S5 V
- time_t now ;* ~" x# Y8 @+ L) {6 Y$ a
- int clock [8] ;7 o/ M. [' w) x5 p
! ]7 q2 x; a3 t/ X' D- printf ("Setting the clock in the DS1302 from Linux time... ") ;, {; _' \0 e( ^7 i! M6 Q! a
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- now = time (NULL) ;) @5 n+ K: z2 a+ f% e1 X& z
- //gmtime_r (&now, &t) ;
H/ |7 \6 u7 |: k - t = localtime(&now);( Q0 \1 P; u7 j" h" b; d
-
$ y! `7 m' H8 j - //clock [ 0] = dToBcd (t.tm_sec) ; // seconds
( t5 H' G- O5 w% I - //clock [ 1] = dToBcd (t.tm_min) ; // mins" p( m; F: N( Z5 W5 c
- //clock [ 2] = dToBcd (t.tm_hour) ; // hours
( d! A* O$ ^7 P$ S+ C; g' b - //clock [ 3] = dToBcd (t.tm_mday) ; // date
: q2 c* }3 r7 }6 m/ f" s - //clock [ 4] = dToBcd (t.tm_mon + 1) ; // months 0-11 --> 1-12# i! Q% L/ h, X5 V9 K9 u
- //clock [ 5] = dToBcd (t.tm_wday + 1) ; // weekdays (sun 0)
: G0 @: p2 j3 P3 q - //clock [ 6] = dToBcd (t.tm_year - 100) ; // years5 C" g& b1 m& P4 J/ s
- //clock [ 7] = 0 ; // W-Protect off; b( u( V) D2 t5 h; S
-
$ U+ F+ G9 X& M! i+ f( J: S5 b - clock [ 0] = dToBcd (t->tm_sec) ; // seconds8 @' X7 ]# A; {4 b( n; t2 E8 n3 C
- clock [ 1] = dToBcd (t->tm_min) ; // mins4 v! z6 ^9 R5 v7 z b. S
- clock [ 2] = dToBcd (t->tm_hour) ; // hours
6 y/ C4 v: N" v, r6 t - clock [ 3] = dToBcd (t->tm_mday) ; // date
; Q8 X a3 M4 B: D5 @, w - clock [ 4] = dToBcd (t->tm_mon + 1) ; // months 0-11 --> 1-12
* }( [% f" w" R0 b# | - clock [ 5] = dToBcd (t->tm_wday + 1) ; // weekdays (sun 0)
' ~6 Y! |! r2 y: H1 G' d/ D - clock [ 6] = dToBcd (t->tm_year - 100) ; // years( x) i5 F5 [0 E' v' p& o
- clock [ 7] = 0 ; // W-Protect off. A- C" B1 S, ~3 F/ r% D; [8 i
4 P6 ~& r' ]1 S; X( c- ds1302clockWrite (clock) ;
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- u& H# N" ?- ~0 W8 M( c- 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( t. k& w7 f" s$ ^% L6 t3 d. @# R
) @! \, d$ h% B6 O- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
8 Y- B9 G$ I( R O; Z! H - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+ Q$ u4 @0 v# F, M- c9 d2 B7 [ - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
2 t( |+ n: u- d - | | | 3.3v | | | 1 || 2 | | | 5v | | |/ v" b0 d* Q' O! D( f9 c
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
) Z8 u2 X+ R1 ] - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |0 J" u+ N! \# k j' X6 G
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |$ ]" E+ f$ S" n1 k3 W
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |( [0 I5 w' E- k/ ~) F0 }
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
6 [/ G3 X" c* m - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
$ |* U6 y' S9 I* Z( e/ D5 ` - | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |& A# b t* W% B* G: d9 ]: X7 ]0 y
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |) b# S: z0 z. `9 H# B/ Y& z/ H
- | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
* \" C& x0 x3 v" N* ?4 O4 s - | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
( c' E# g0 R9 W4 F - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |9 B7 r) ]( w& h! y/ N8 ]
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
% V. z1 |9 P+ |# e7 ?+ x8 Y - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |! V6 x4 [ e; l. |% g
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
+ \5 _! c u, r1 {' a8 R - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
5 B0 N- b2 K. s2 T( H - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |4 ^$ j/ A! v0 n; W' w1 y' m
- | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
, i7 K( y9 ~% g8 e* z - | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |- q0 p' y$ z% D" x
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
3 u" _, C. O+ v- U9 `" s& n; n - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
) u$ N8 {- K5 B9 g& C - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
* i e! J) T( _ B - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
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复制代码
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