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) Y4 q' h$ T: p% }# [6 c0 v# @7 e, @
2、连接ds1302模块和树莓派引脚- Q9 l/ _! W) e# A4 _8 ?" o* W, l6 R
连接前需要在ds1302的DTA引脚上添加一个10K的上拉电阻,
* L" B2 \, L% T6 D& g6 f& cVCC—3.3V—-
% T3 ~* p' q4 _6 F6 P9 i% ]7 nGND—0V—-: w0 a2 y3 C Q n
CLK—SCLK—-23" w4 C" r& A; k7 `6 v( l
DTA—SDA0—-24
# f& ^: N7 v+ N# U9 m8 ^8 ]: bRST—CE0—–27
* x: F# \1 N# Z6 X6 i, T3、修改程序
1 G0 x5 t4 [, I+ I% Uds1302.c的mian函数里有一个ds1302setup()函数 ,用来设置引脚,修改如图:
0 G* J8 W6 {2 c) ~2 x/ K5 y; y
- Y/ Y* a1 @# q- int main(int argc, char *argv[])
. d9 M* o1 ^, p7 K7 K, W - {& `& m% n' {6 N+ W( }* p
- int i;
2 b6 ^7 S* E- n; J7 z$ v. l - int clock[8];
9 V1 l3 g* Y5 u
1 b- u1 O' _- {. O4 R# ~. v- wiringPiSetup();/ L5 G$ E; P2 Q$ s* j/ _
- //ds1308setup(0,1,2);
, O \+ k: C/ [ - ds1302setup(14,10,30);8 Q: P/ Q- e- `+ S/ d4 T
- " j. r; B0 I7 M( m& F+ m
- if(argx == 2)
8 N8 o4 v; g/ T& A. @0 A, V$ z% y - {
0 M9 P/ N' t: s3 s6 i* _) s! \8 w - /**/if(strcmp(argv[1],"-slc") == 0)* P V0 L I. ]4 Z$ K4 J
- return setLinuxClocl();
' f2 @& U4 ]' f: L - else if(strcmp(argv[1],"-sdsc") == 0)7 o3 L; P& i" C
- return setDSclock();
/ E* I _6 p1 ]& a, ]+ |& w$ K& l - else if(strcmp(argv[1],"-rtest") == 0)
9 R. h6 }0 @' i* }1 ]7 g1 K - return ramTest();
7 n- u( o0 e- b+ Q( v5 `9 P - else0 p; n' {* t: y
- {* h4 d$ C& `6 x; O0 @1 i
- printf("Usage:ds1302[-slc|-sdsc|-rtest]\n");; Z/ X8 z; {0 b
- return EXIT_FAILURE;4 p9 f$ @2 z. g F: N
- }8 _6 v4 p" P9 {$ ]9 g
- }
& p* h1 D) T3 b% l+ w3 G3 J - 7 U5 V+ z# G3 P# f- o0 W& U
- }
复制代码 这里的14,10,30引脚号是wPi的编号不要弄错了
8 ~8 y0 M% \/ V. ?' Q; m
: E* Y, ?' h; z$ U& v6 k
# f( P# a6 f6 f9 Q1 O8 W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
0 k3 x4 Q4 O& U6 f" \5 g# Y& Q4、测试 c. b7 T" V; X5 o0 A
4.1 执行sudo ./ds1302 -rtest; }2 m9 E% g7 v& E/ I* r
显示:; \# P l8 m2 D. V7 h
& ]# A' F* R" h$ p* w* b
说明一切正常,否者请检查连接是否正确
- D! S; N4 A4 t& N4.2 sudo ./ds1302 -sdsc 即可将系统时间写进ds1302模块中去
- |3 X5 k4 `$ S3 }4.3 从DS模块读取时间! i8 t8 C3 J% s1 K0 s5 O. o
执行sudo ./ds1302
) `: g3 Q: n) c9 I% G
8 c$ U6 Y" J* a
4.4 从DS模块读取时间来设置系统的时间
# V4 ]$ j" R1 T0 m7 w" m6 O s( Ksudo ./ds1302 -slc
: C+ T# K( |$ l: f5、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) c( Q5 h; x修改ds1302.c中的setDSclock()函数
# m1 A4 X1 G6 O0 B1 }( {2 O) q9 e: G如下:: M! d0 \0 V: S5 ?/ }: i
, Z k3 g7 T" R# X2 z
- static int setDSclock (void)+ a3 P [% _5 h+ @5 r% }
- {4 W7 {$ ~5 h' C6 S- t
- //struct tm t ;! i. k0 }& l: n- j3 V) u
- struct tm* t = NULL;+ J/ {4 V8 D1 ~9 O0 I B
- time_t now ;
4 q/ _; r7 O( F$ V8 ~4 J - int clock [8] ;9 o0 h3 x8 D( [7 E# y
- $ g5 o( f5 k$ ?. G( y! v4 ^/ X
- printf ("Setting the clock in the DS1302 from Linux time... ") ;
3 {8 R1 c6 j: y9 B, @$ Y4 H - 8 }7 Q% A+ r9 T' T: {
- now = time (NULL) ;/ Q& @! |! t' ~: B9 T
- //gmtime_r (&now, &t) ;% R* [6 X7 B w) R# W7 k
- t = localtime(&now);
5 j& F4 l4 ]7 C - 7 P3 b6 [/ k7 ]0 d3 Y6 n
- //clock [ 0] = dToBcd (t.tm_sec) ; // seconds. Z7 I- ~$ z# Y, ^- D
- //clock [ 1] = dToBcd (t.tm_min) ; // mins3 f) _* U1 x" _: P% }/ F. W1 U
- //clock [ 2] = dToBcd (t.tm_hour) ; // hours0 u# G1 x' @, v! [" A! ~
- //clock [ 3] = dToBcd (t.tm_mday) ; // date, A6 w2 a9 v+ H L7 _& X
- //clock [ 4] = dToBcd (t.tm_mon + 1) ; // months 0-11 --> 1-122 o+ K- k7 A+ l/ B' q( ]. |8 @
- //clock [ 5] = dToBcd (t.tm_wday + 1) ; // weekdays (sun 0)
0 _3 {7 ~; f- u. b* m* q - //clock [ 6] = dToBcd (t.tm_year - 100) ; // years4 O, G1 M4 u$ f7 t, q7 Y. s7 \
- //clock [ 7] = 0 ; // W-Protect off
. q+ b) A4 b4 _- F9 R4 E - / ~) h/ @$ Y% h. T
- clock [ 0] = dToBcd (t->tm_sec) ; // seconds! D( N9 X3 w u' c
- clock [ 1] = dToBcd (t->tm_min) ; // mins1 t% N" I! d" T
- clock [ 2] = dToBcd (t->tm_hour) ; // hours' j) T l; c% a
- clock [ 3] = dToBcd (t->tm_mday) ; // date
5 B9 I2 B$ q8 {/ E% g8 b/ V$ | - clock [ 4] = dToBcd (t->tm_mon + 1) ; // months 0-11 --> 1-12
# z) ]- o; O1 C0 U4 A - clock [ 5] = dToBcd (t->tm_wday + 1) ; // weekdays (sun 0)6 ?* I8 f1 ?; U; ] t+ @1 x: R I
- clock [ 6] = dToBcd (t->tm_year - 100) ; // years
/ b8 `% a6 @# O4 z! Q; q - clock [ 7] = 0 ; // W-Protect off" N8 t- {# X* H) X8 y. I
- 9 e j7 n, D! y; K h8 F3 k% j
- ds1302clockWrite (clock) ;- r# v% r# I- @- |& N& j9 j' Q
- , E' i5 p- j7 Q3 T7 q' 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
K7 h# E( V8 k8 s( v( 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& j; D9 N6 w9 ~8 B3 p( y
7 p0 O2 B- o% C1 u8 ?! ]3 Y" J
- O" Y: t) {* u+ I( z% {. Z/ O3 g' c d e
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 # ]. C3 l" K. M/ T7 ~$ @, v
DS1302 RAM TEST FAILURE. 433 errors.
$ B6 n' d. M6 W9 S" g5 N. dDS1302 RAM TEST FAILURE. 465 errors.1 [# }6 J' S/ u/ P- @$ A6 g4 w" H8 b
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)
2 w+ d! p2 \- G6 P5 v# }+ U4 ?/ r0 H. M, l" m7 n" k: d
GND:模块的地,接树莓派的6号引脚(Grand)+ G& E2 W I3 z b4 T, p3 C
4 G0 \/ m; w& h9 }/ y) z
CLK:SCLK 串行时钟,接树莓派wiringPi 0(物理编号:11号)
{# n0 U# M3 T7 y- N J6 P! A: f! ?+ A+ i- Y1 h
DAT:I/O 数据线,接树莓派wiringPi 1(物理编号:12号)
0 k# A0 s- P9 z& G' z: J- ]/ ?6 G: W
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 $ pwd0 @! o3 N- A8 N! L
- /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!
' p5 ]: @* V% f
作者: admin 时间: 2020-7-21 00:29
解决小时无法同步问题
6 M% {' X& b9 r4 @
% l7 x$ e, n( v8 F9 ?- static int setDSclock (void)
! w/ r8 t3 U9 e7 u1 j4 m# O - {* a8 {" ~8 ^% j: C% o- j+ [6 L( H$ u
- //struct tm t ;
, D0 B0 c/ {* A( N, ^ - struct tm* t = NULL;: L9 _0 y" p) _1 c0 H5 t3 B7 Z B
- time_t now ; ?2 R: `6 }/ K9 K/ g6 n
- int clock [8] ;3 f- [" C3 h' y/ B
2 ?% W! ]% Z# P- printf ("Setting the clock in the DS1302 from Linux time... ") ;
9 [& b: Y9 E0 [9 q
5 J! [' V! _3 X& ^- n- now = time (NULL) ;
6 d& `/ F6 |: ]( A/ Z - //gmtime_r (&now, &t) ;' P; h3 N5 ]- n5 ^. l. i5 \5 g
- t = localtime(&now);; A9 T4 K6 C- N) f0 @7 d
- & Q1 g& W9 w$ o& F
- //clock [ 0] = dToBcd (t.tm_sec) ; // seconds1 O# R" R8 Z G7 \# d
- //clock [ 1] = dToBcd (t.tm_min) ; // mins
" d. ~6 a& p7 G - //clock [ 2] = dToBcd (t.tm_hour) ; // hours# r3 j) z" s' R' ]3 |; {. |: }0 ?
- //clock [ 3] = dToBcd (t.tm_mday) ; // date2 a/ V- E( ^: @2 G
- //clock [ 4] = dToBcd (t.tm_mon + 1) ; // months 0-11 --> 1-12
) |4 t n% t& Q - //clock [ 5] = dToBcd (t.tm_wday + 1) ; // weekdays (sun 0)
- z. e0 l! E3 j( _1 t - //clock [ 6] = dToBcd (t.tm_year - 100) ; // years5 \! Q5 Z! l' p% v" y1 L" W
- //clock [ 7] = 0 ; // W-Protect off" q2 c; [( `" |2 h. m
-
' A" ~3 G* c; O+ ?- a - clock [ 0] = dToBcd (t->tm_sec) ; // seconds
: l9 h Q: \ g/ j8 y1 S# p - clock [ 1] = dToBcd (t->tm_min) ; // mins
$ P: l2 M* }7 q% d+ w* V - clock [ 2] = dToBcd (t->tm_hour) ; // hours7 {/ J; J, ?& V( g4 x( E8 |
- clock [ 3] = dToBcd (t->tm_mday) ; // date: C: V5 P2 W: g0 ]1 N& Y# e$ T- |: E$ D
- clock [ 4] = dToBcd (t->tm_mon + 1) ; // months 0-11 --> 1-12! G( T# B0 v: \
- clock [ 5] = dToBcd (t->tm_wday + 1) ; // weekdays (sun 0)
' o/ R3 R$ E, Q5 E" g3 ^+ [ - clock [ 6] = dToBcd (t->tm_year - 100) ; // years
- L& U1 T2 [0 ` - clock [ 7] = 0 ; // W-Protect off( K9 E7 {: J; K/ t
- 7 z$ l4 c8 z4 |# z
- ds1302clockWrite (clock) ;" J# r+ g( B! m% W$ b& F
- : d( | p$ O4 O+ w8 m
- 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
2 u5 s% g S# k; A X
作者: admin 时间: 2020-7-21 15:27
gpio readall 调出接口图
3 M h: i c8 d# `$ S0 }3 I* Q4 ~" a
- +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+
5 y X: j' v% B8 Z a - | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |' S- c" _0 ]. Q7 k" d! u
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
5 W6 ^6 k/ c! \/ r$ x+ y - | | | 3.3v | | | 1 || 2 | | | 5v | | |; O# [5 v. i0 k- c+ q/ ?% O
- | 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
. n& J; W* U) J0 R4 C+ V - | 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |; M) s8 Q& \: `/ P
- | 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
4 s3 f& j4 s( r+ D5 l- l - | | | 0v | | | 9 || 10 | 1 | ALT0 | RxD | 16 | 15 |
0 v6 }* s; Q, J* x. ]% q- J- Y* P - | 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | IN | GPIO. 1 | 1 | 18 |- H7 W# h: Y5 z) L9 A. x! L$ |
- | 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |/ W5 b; g* t9 r* ?
- | 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |' B2 A: u% `+ W. { Z w) r- ?! G
- | | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
2 J/ K k9 F& `5 e {1 n1 P - | 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |2 ~. N0 ]$ [0 `' ~* ]
- | 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |- m+ {5 M s* T3 V
- | 11 | 14 | SCLK | OUT | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |1 o& F4 e% `9 G
- | | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
8 d, L8 w! a9 J. c - | 0 | 30 | SDA.0 | OUT | 0 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |2 D( } S2 t0 e$ v! u0 R# l2 ?. r
- | 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
/ |4 _' F0 j5 p- v - | 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
; A" i- ?5 ^: \" Q' k - | 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
/ K0 g) g0 T. w$ N( Z# P/ p" K - | 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |9 E6 P( l4 U( W* |2 S6 B
- | 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
! G }0 |5 J( G, i( u - | | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |* F7 V5 _" y1 D/ N0 X d$ D
- +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+8 W# k- o( r! I
- | BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
0 x+ a n* o6 Y- [8 [# \ - +-----+-----+---------+------+---+---Pi A+--+---+------+---------+-----+-----+4 C! c t* @# w2 @
复制代码
欢迎光临 cncml手绘网 (http://www.cncml.com/) |
Powered by Discuz! X3.2 |