cncml手绘网
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)! \8 S, |4 v! q- I J$ C
2、连接ds1302模块和树莓派引脚% w2 X& v9 q( \7 b
连接前需要在ds1302的DTA引脚上添加一个10K的上拉电阻,; U& ~3 k3 o0 m9 a, t4 W% a
VCC—3.3V—-
) f+ L- @* M$ L9 iGND—0V—-
( c/ {" K1 z9 y- b$ aCLK—SCLK—-232 U6 Q" n5 _% y2 |' i
DTA—SDA0—-24+ d) b+ C% B( C2 O/ v' C
RST—CE0—–27
; l7 z; m0 k: y$ c3、修改程序
$ }" s, V Z) L; }# w8 r |4 Mds1302.c的mian函数里有一个ds1302setup()函数 ,用来设置引脚,修改如图:
/ o6 q6 I" A+ y: q5 i6 H7 H3 R7 ^* C9 ?$ [
- int main(int argc, char *argv[])
* S f5 S7 c# e3 p2 O+ n - {
: Y. h) K2 v& ^$ ]; `( ^ - int i;7 E& _( o% s) |& ^4 ^
- int clock[8];4 }/ @7 ~4 e/ C* ]# C2 Q
- ! `! a1 ?% O% {! [' k
- wiringPiSetup();6 |& `6 l7 d- L
- //ds1308setup(0,1,2);" h. ?- p" \" o' q% k
- ds1302setup(14,10,30);, H1 ^$ U' h2 f
-
! t4 `- s% ]6 M$ a2 H - if(argx == 2)
R: S2 z2 e) I' ?3 K! X; u2 `: K - {$ g1 }* R3 v( R9 L- O8 v; Z5 l: V
- /**/if(strcmp(argv[1],"-slc") == 0)
# a* k8 D6 o& H - return setLinuxClocl();6 _- w) K$ j+ [& j' d9 x# M
- else if(strcmp(argv[1],"-sdsc") == 0)
( s# G5 R" [4 B; Q, }3 T0 A - return setDSclock();
; i, L7 J2 g* g2 o - else if(strcmp(argv[1],"-rtest") == 0)
1 r# X4 \6 z2 S, u4 ~/ C4 Z - return ramTest();
7 ~. k7 c% d3 R5 ` - else" x! f; [; N8 J
- {; C% b* r; y1 S, {
- printf("Usage:ds1302[-slc|-sdsc|-rtest]\n");
$ L) p9 A! B j% L4 q* c* [) R - return EXIT_FAILURE;% j3 C' B! _/ Z( ?
- }( M+ ~: w5 i1 Y
- }
; `6 w6 e7 F+ @" U- U, W
( h9 F% J4 c) r& Y& y! P$ r( G- }
复制代码 这里的14,10,30引脚号是wPi的编号不要弄错了
" A; a& P! U' W& {+ F- O
+ u, ~: D9 v0 t0 a+ P6 _" p0 b1 Y4 {6 t
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ds13021 p; U7 d4 S `
4、测试
- e3 S4 M- O6 X7 {4.1 执行sudo ./ds1302 -rtest- { J8 J/ Y% ]
显示:
8 A) c* {2 C7 ^' f6 ]; h
& j0 o6 {2 j( v% ?$ D! M+ v! {% `说明一切正常,否者请检查连接是否正确
8 ~- b, ^: S' p# e9 z6 I; Y2 V4 W4.2 sudo ./ds1302 -sdsc 即可将系统时间写进ds1302模块中去. A; Z7 ]+ r! [/ A( w
4.3 从DS模块读取时间
! T/ c* j6 f. ~, M- ` k! o( D) q- Q执行sudo ./ds1302
7 A4 u/ h4 V+ h2 n4 b; Q) b
& z4 ^$ E. M% n1 ~6 x. ]4.4 从DS模块读取时间来设置系统的时间7 L$ g: C2 w& O6 m
sudo ./ds1302 -slc5 _% H$ X- n5 Y' M+ v5 x
5、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),)% T: v4 r0 I3 X0 f# Z7 S
修改ds1302.c中的setDSclock()函数+ S* E, M% G! j6 Q8 T! }0 ?1 n
如下:
/ Q; ]. o0 R; y' H! L
+ ~1 W& }& f( p$ U8 I" X
- static int setDSclock (void)
/ W- Q# j4 V; V, A - {
& } n) P9 Q( F" c: Q - //struct tm t ;
- y! T, Y- O5 N8 Z+ t3 J! B Z - struct tm* t = NULL;
: r- ]/ o: ?/ H* a* y4 S3 }/ T& B - time_t now ;; U4 M7 s5 W( N4 K7 t' a
- int clock [8] ;: k; V; l" B6 o6 w& q
& V8 R3 r1 l2 o, p7 [ D- printf ("Setting the clock in the DS1302 from Linux time... ") ; M' W, B; `$ X+ S, ~; c
- ! t* w& H) Q# X/ W+ P; {
- now = time (NULL) ;( M- } s2 v: c" V* k8 S
- //gmtime_r (&now, &t) ;/ o6 F* ?. d& P, h+ e
- t = localtime(&now); g+ ?% v, s# A+ \# y
- 8 g0 h- s3 a3 S4 u8 s. k
- //clock [ 0] = dToBcd (t.tm_sec) ; // seconds
4 g) K m$ x2 t' t+ S* x - //clock [ 1] = dToBcd (t.tm_min) ; // mins7 I& \ D2 |4 d4 ~/ ^
- //clock [ 2] = dToBcd (t.tm_hour) ; // hours
7 D. Y6 s# a/ ?! k h/ ~, i( w' F - //clock [ 3] = dToBcd (t.tm_mday) ; // date5 A$ C! U" v9 e
- //clock [ 4] = dToBcd (t.tm_mon + 1) ; // months 0-11 --> 1-12
9 I3 |/ M, ` W- B( o K1 D0 X+ c - //clock [ 5] = dToBcd (t.tm_wday + 1) ; // weekdays (sun 0)
: X+ W* ~% _# O9 v, b' k. J% p - //clock [ 6] = dToBcd (t.tm_year - 100) ; // years- a3 a$ F, [: a! Z2 H' a# X* Z8 |
- //clock [ 7] = 0 ; // W-Protect off
$ y* F- `. n u* K, i( \ - * Z( `7 `" k6 l2 u& V* S2 D1 R
- clock [ 0] = dToBcd (t->tm_sec) ; // seconds+ h( r8 N7 ]7 K
- clock [ 1] = dToBcd (t->tm_min) ; // mins
! c* }1 ?+ q* d - clock [ 2] = dToBcd (t->tm_hour) ; // hours
1 {3 ^9 Y. w" D - clock [ 3] = dToBcd (t->tm_mday) ; // date& r1 i; z/ ?" E3 O2 |: l
- clock [ 4] = dToBcd (t->tm_mon + 1) ; // months 0-11 --> 1-12* |/ q7 j: ^! _
- clock [ 5] = dToBcd (t->tm_wday + 1) ; // weekdays (sun 0)( u O5 I4 k& x, [
- clock [ 6] = dToBcd (t->tm_year - 100) ; // years! |. |& F5 I4 Y; {$ t+ R$ i
- clock [ 7] = 0 ; // W-Protect off, t7 j2 i% @/ y2 F( n* t5 m* c
6 L4 J+ \, w6 N8 W8 m! G" u- ds1302clockWrite (clock) ;& w( ]" t5 s8 Q9 t# ?, W0 ^
- 8 A( X1 X \6 @5 H/ e
- 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 7 {4 P [0 x2 B* a/ j
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
7 J6 x) n; I0 h9 Q9 M( Y
; _3 F5 M( O8 f T" P3 p
* c/ E3 a) r3 }2 t( z
2 G: z% X9 H! ?$ i- F- y/ C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
) \) F3 e* F% G& Z) @5 q- gDS1302 RAM TEST FAILURE. 433 errors.
3 r+ W0 @3 C. o4 N9 bDS1302 RAM TEST FAILURE. 465 errors.
. [7 a8 _& W Q% F* 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)# [- v$ D' T3 F q: e+ t
6 P% ~( I N4 S1 |/ Y/ y
GND:模块的地,接树莓派的6号引脚(Grand)0 D! K! P: k+ \! ~1 I
k& w2 s1 W$ z" x2 F, P
CLK:SCLK 串行时钟,接树莓派wiringPi 0(物理编号:11号)
( d6 m4 J; _4 {, S2 O4 {: o3 @$ L( Q
DAT:I/O 数据线,接树莓派wiringPi 1(物理编号:12号)$ k2 }" l& ?$ P, |% u
3 B. f0 i0 u& e4 a( V% z& B4 h
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 $ pwd
- H6 v& {; [; f( 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!
& h$ N/ V8 w' R. s
作者: admin 时间: 2020-7-21 00:29
解决小时无法同步问题5 k( Q* @5 d( i. _% e
5 x0 Q" W( L" y2 [
- static int setDSclock (void)
! G$ C$ D+ |9 g s' [6 R - {8 i* ]0 D9 c! S- y2 n8 F. B, I9 X
- //struct tm t ;& b+ I; D$ n1 p: u3 E4 ?
- struct tm* t = NULL;: C# x! E/ V+ `4 m% n: J( t
- time_t now ;8 |, V" R1 H1 Z
- int clock [8] ;
# x2 u4 T" o; }; {- G" x. J+ v - ! W. ^+ x6 Z C+ r9 [6 k/ Y
- printf ("Setting the clock in the DS1302 from Linux time... ") ;
2 k5 h* P( E! X% X( C# e4 E1 ]/ K
8 H6 J8 Z0 l% c6 B! O/ d+ `- now = time (NULL) ;
4 _+ E3 |7 o# q+ z' y* _$ k - //gmtime_r (&now, &t) ;
, @+ Z* F; {4 {# N T9 ` - t = localtime(&now);
2 i8 c$ \! v7 S! s -
5 A* G4 d, H0 K - //clock [ 0] = dToBcd (t.tm_sec) ; // seconds2 z2 H' K) A# H
- //clock [ 1] = dToBcd (t.tm_min) ; // mins, o X L1 i: N; m( m
- //clock [ 2] = dToBcd (t.tm_hour) ; // hours
% m8 s$ \9 o( L, F - //clock [ 3] = dToBcd (t.tm_mday) ; // date
! n% d5 v$ m! _4 K- c" O - //clock [ 4] = dToBcd (t.tm_mon + 1) ; // months 0-11 --> 1-12
3 R1 g; {' C# T& W' ?6 N7 Y. p - //clock [ 5] = dToBcd (t.tm_wday + 1) ; // weekdays (sun 0)
* g `8 h- X/ a5 ]# b; f8 c - //clock [ 6] = dToBcd (t.tm_year - 100) ; // years$ T4 Y; e$ w3 ?; _# q
- //clock [ 7] = 0 ; // W-Protect off9 W8 y# d2 j& _1 `9 z3 F
-
- F X1 ?9 A7 `) x - clock [ 0] = dToBcd (t->tm_sec) ; // seconds
, x! d7 F+ r2 h, p: p; j+ p; \ - clock [ 1] = dToBcd (t->tm_min) ; // mins [8 B, s# s7 J Y- q
- clock [ 2] = dToBcd (t->tm_hour) ; // hours( }9 v5 F' `) u, ^: m P9 @8 R+ k
- clock [ 3] = dToBcd (t->tm_mday) ; // date: U5 f/ t+ }0 a/ O- ]3 i& e6 F
- clock [ 4] = dToBcd (t->tm_mon + 1) ; // months 0-11 --> 1-12+ o( Z% Z( L+ f3 }7 _1 `
- clock [ 5] = dToBcd (t->tm_wday + 1) ; // weekdays (sun 0)
8 k( ]4 {8 \3 _3 a6 M - clock [ 6] = dToBcd (t->tm_year - 100) ; // years x L2 a/ a0 ?6 v, {7 w; Q4 _
- clock [ 7] = 0 ; // W-Protect off' X3 t/ d+ m; x& ~9 M
G" r. ?. h/ `. | O+ w1 E- ds1302clockWrite (clock) ;
/ z: I8 W; g7 l# H, M - % B" z4 L5 R3 |& v7 l
- 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
( y& ~, f8 V" P3 g9 s
作者: admin 时间: 2020-7-21 15:27
gpio readall 调出接口图
6 ~# C/ @' R+ S8 j4 t( E1 T1 f+ `- P' ~- Q5 g
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
2 h% ]8 ? C% y& V3 j" \- T - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |% F' o( ~; [# x9 u
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+* R8 l( j+ @+ k. D$ O. |) g' c
- | | | 3.3v | | | 1 || 2 | | | 5v | | |
0 Q9 |* ]! S' M* B; }; y* T - | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
5 r$ I) ~& O. r9 { - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
) L; w1 M7 z; d( ^) A! B2 v - | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |, {1 w, H/ T" `% i, [5 ~
- | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |0 d+ M" Q5 \" C1 M2 h
- | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |
( \! r/ u( K( }* Q) b2 i - | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |6 Y2 q8 g/ X) m" W; R' w9 y
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |5 F1 `+ B$ W+ d" ^; Y- e2 W" `* y1 V
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
$ c- [, n5 d# p6 j: I - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |7 `. U7 x* n* U8 A
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
( R4 p2 T/ ?7 u5 o9 E6 F - | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |. Z3 y* M; [) w8 i4 r8 ?1 Z( }
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |6 g- C0 G& p9 ^) m4 Y6 v j
- | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |. N0 Q( o& a5 o( m
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
& m$ P. W7 Z2 T/ m - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
6 _2 L; R1 W- b J) h% ]! m, k - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
9 o* b0 F2 S# U0 d) N% h( P - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |' P. u, w/ H B; E- H/ Y
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |' {8 L1 U, o- n: t, @- S
- | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
: d0 ~6 t8 ^ ]8 x6 B - +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
8 d# F6 p( u% f1 D1 T - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
. C4 x, x E6 V& x! m1 I6 y - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
# B9 i W( j4 m: e) D/ B1 N
复制代码
欢迎光临 cncml手绘网 (http://bbs.cncml.com/) |
Powered by Discuz! X3.2 |