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我讲创龙在DSP中使用的例子移植到ARM中,如下是我的底层驱动程序: * l6 C" l: n4 u! I \
/*, \2 A7 \( o0 U9 [
* Copyright (C) 2009 Texas Instruments Inc
* P! g( o2 A) b! N* R8 n *, p! K3 n2 a7 ?9 X% u
* This program is free software; you can redistribute it and/or modify
, Y* r7 Y& g8 `% K% s * it under the terms of the GNU General Public License as published by
& o: V% W B/ Y% Z4 c! X0 W1 M; E- a0 g * the Free Software Foundation; either version 2 of the License, or
: g, e( N) S2 N$ t% L3 O * (at your option)any later version.
" s3 I$ z* L, g2 e/ } *
( y7 P- L* B: U * This program is distributed in the hope that it will be useful,7 q6 [- ^% M" Y7 r3 Z+ i% X" E
* but WITHOUT ANY WARRANTY; without even the implied warranty of8 U* J) J# w, Q+ x
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the# | I0 }5 ~" h
* GNU General Public License for more details.
/ o" ?3 h: T3 ~0 }# m1 |" N *& t/ y$ s: A) G! L
* You should have received a copy of the GNU General Public License4 S( j1 p3 w- R- [5 w; ^% {: e
* along with this program; if not, write to the Free Software# }! n ^0 j4 z! ~$ c* m
* Foundati9 f% i5 o. w6 M9 O2 D
*/
! n4 E: }9 H7 D4 G#include <linux/module.h>
4 r& `; a O5 N; c3 g#include <linux/init.h>' l4 D$ e3 p$ _6 n5 ?
#include <linux/errno.h>- c& C$ M) D$ j" w4 V# C6 i
#include <linux/types.h>, l5 Q! r: P1 e! N2 G. {' C: s6 b$ Q
#include <linux/interrupt.h>8 u. j3 ^( M) |* \6 l1 i; S( P
#include <linux/io.h>% ]4 Z I+ z6 ^0 P6 ]7 ~2 q' _% A
#include <linux/sysctl.h>
; |6 C4 i. {1 h1 Y$ C0 @$ } `* E#include <linux/mm.h>
3 X( k/ v5 H$ Q) p4 a* s; M#include <linux/delay.h>* ^6 y, C2 L, c# c) V5 {# f
#include<linux/kernel.h>1 i$ ?0 Z6 v/ u6 c
#include<linux/fs.h>
: R2 O$ A6 l; i- \5 t#include<linux/ioctl.h>
+ W. Q( ^7 R! N1 W A% I#include<linux/cdev.h>
* c& N2 b6 h5 m6 W#include<linux/kdev_t.h>4 b {4 {. [2 S* T9 `, v
#include<linux/gpio.h>- x2 W/ b) M6 Z# M; _
#include <mach/hardware.h>
# G9 i7 T5 G# q ]3 a* ~3 k8 w' s#include <mach/irqs.h>8 d5 D8 k6 j% X' L8 [8 x- @
) l. S0 E* |6 Z#include <asm/mach-types.h>
8 U8 C% ?! V8 {% }; U) L#include <asm/mach/arch.h>7 S& h' |! U& c' x, r
#include <mach/da8xx.h>0 f. h; Z4 ^( X8 A' m, ^8 M
#define SYSCFG_BASE 0x01c14000+ q) H! \9 Z) F
#define PINMUX1_OFFSET 0x124
# F; Y$ B. I$ J#define PINMUX18_OFFSET 0x168 & s+ R5 G2 C3 D
#define PINMUX19_OFFSET 0x16c
6 N' r% J* B/ s7 ?#define SPCR_ADDR 0x01D11008 //MCBSP1_SPCR7 @+ k3 { q- T% A5 o1 Y$ B
#define RCR_ADDR 0x01D1100C //MCBSP1_RCR
3 A8 E; Z' p" `4 X+ C( n#define XCR_ADDR 0x01D11010 //MCBSP1_XCR# t4 o1 n2 o) c- c
#define SRGR_ADDR 0x01D11014 //MCBSP1_SRGR
2 F9 p! F0 d! X% |+ T#define PCR_ADDR 0x01D11024 //MCBSP1_PCR# b. X) S# h$ F& Y7 x+ L, W+ }
; P; Z* }. Q- c! D# Y9 d G#define DXR_ADDR 0x01D11004 //MCBSP1_DXR; g# ?7 |& K8 {7 m" |
#define DRR_ADDR 0x01D11000 //MCBSP1_DRR
! Z8 o: e+ ~1 Z& ~//PSC8 m# {# l! O1 a5 N% J9 h
#define PTCMD_ADDR 0x01E27120 7 Z' X$ r% P8 ~4 ~% N% I" j
#define MDCTL15_ADDR 0x01E27A3C0 ?4 Z; v' k0 i
#define PDCTL1_ADDR 0x01E27304
! x, v; `- g8 {: N- V//GPIO8 direction
3 X% W# O$ O0 @/ Y6 w#define GPIO8_DIRECT 0x01E260B08 B6 N( v0 T% ]9 Z; \3 h a
#define GPIO8_OUT 0x01E260B4/ A8 O0 o9 l% \- e6 c7 ?% t; S9 B
#define GPIO8_IN 0x01E260C0
/ ]5 r/ ]. X4 l0 a" C! h
. v& g6 E9 ^& ^2 H9 Q( C5 F//#define MCBSP1_RINT 99
9 ]8 r( d' y% j//#define MCBSP1_XINT 100
& q1 f" C5 U" F* E% i; `- [7 a* @static int MCBSP_MAJOR=239;, M+ Z+ M; K1 d6 y8 S8 i' S
static int MCBSP_MINOR=0;
' A) y) k8 K( W) D4 Sstatic int count =1;4 [4 q( h& E) t3 g) U/ n
& y# b1 S$ \( P1 u! m! ^& G# R6 ?0 a; _
#define MCBSP_NAME "MCBSP-device"/ k/ B& H8 c5 c- T- T3 N
0 d6 {8 C0 X6 v6 G
static struct cdev *mcbsp_cdev;6 x* }$ O5 T0 C
static struct class *mcbsp_class;; k+ J! S* s4 t; p0 n
static dev_t mcbsp_dev;
3 J5 i3 I9 I( [% ^- ]4 }- Yunsigned int DRR_data;
5 y9 q* J0 t6 R" E* G1 zunsigned int DXR_data;
4 I7 C, _+ }& Tstatic int mcbsp_open(struct inode *inode,struct file *file)
) A8 \! G# {5 K+ |0 f{
" L' z$ ~* ~4 Q+ d& H- J2 { ! V+ {* c2 r- ], K( X
//interrupt enable,initialized
# Z/ l$ \6 y+ y) H$ P& P s4 U unsigned int temp;
/ u8 V6 G& L7 S( m //SLEEP_EN(GPIO8[10])---0
) _* w4 E! L4 _: f# f temp = __raw_readl(IO_ADDRESS(GPIO8_OUT));- b5 R) Y5 q9 N
temp=temp&(~0x00000400);
3 J* q$ y' Q% ?. D6 z; ? __raw_writel(temp,IO_ADDRESS(GPIO8_OUT));//GPIO8[10]2 V4 c& `( J1 D3 T4 x; y
//RESETn(GPIO8[8])----0----1
k b/ w+ ^% E% m7 w6 M temp = __raw_readl(IO_ADDRESS(GPIO8_OUT));: C4 V6 Z. ?8 N7 O
temp=temp&(~0x00000100);
# F2 o- L) I4 F; `- p __raw_writel(temp,IO_ADDRESS(GPIO8_OUT));//GPIO8[8]---0( w$ x+ v8 P1 K4 l3 V' G& G
udelay(100);* S0 q1 {( x& n# W" g) J
temp=temp| 0x00000100;' R& L4 R% x7 e7 h
__raw_writel(temp,IO_ADDRESS(GPIO8_OUT));//GPIO8[8]---1
( j6 ~2 i! R2 I+ |6 N% Z1 P udelay(100);' ^; {5 N6 c' j" E- ]" b) a
printk("open success!\n");* y- ^ d( t$ @/ T
return 0;: V& O. t c$ J. ^! S2 D$ p9 @" G
}
; B$ ? D4 B# {' e G( }
* y/ D5 t) U0 n0 v" jstatic int mcbsp_release(struct inode *inode,struct file *file)
4 v" j/ R" \" X8 f{
' _9 \1 w# z8 y9 Z/ U9 O printk("release success!\n");: }1 Y* C( b% s- c4 q2 [% P
return 0;; R9 ?2 L: z Q: `
}2 {6 b' T( X3 h
7 K# w* p6 B8 f& {
static ssize_t mcbsp_write(struct file *filp,const char *buf,size_t len,loff_t *off)
( v/ }: D T' A9 N8 c{
i9 Y1 ~* o5 E3 v copy_from_user(&DXR_data,buf,len);
; |; N8 @ d! A U1 D iowrite32(DXR_data,IO_ADDRESS(DXR_ADDR));
: S& |% P0 W$ ` return 0;
$ f! e; x% U0 l. B
: {0 s# v& Q# R5 \. \/ q/ q}. u( G" P; f) F6 G# @$ Y" r
! s0 ]( a: L' B' O9 v: U* m, c; Y
static ssize_t mcbsp_read(struct file *filp,char *buf,size_t len,loff_t *off)
! F- a9 }1 s/ q{
2 J7 [6 @* g1 b0 T0 r DRR_data = ioread16(IO_ADDRESS(DRR_ADDR));
/ o: Z! D/ H+ N" J' C* z I( l copy_to_user(buf,&DRR_data,len); 4 C8 R. A' Z4 C/ X
return 0;
8 H' A, M" \. |+ R6 [: E, {& W9 ]}
0 x' ~2 J' @: {8 D9 D
7 W1 b+ z" E" G5 R* i, f) R- M2 ]; x0 E' d4 g! Z
static struct file_operations mcbsp_fops=& f8 c+ p6 k( J
{, R& M6 f& m7 J) S3 p: S
.owner=THIS_MODULE,
5 h; \) W3 `$ Y3 P8 i! O .open=mcbsp_open,
3 O u/ C* K8 U# {8 E .release=mcbsp_release,1 y1 ~3 v% @0 T5 d
.write=mcbsp_write,
' \' J$ t a B. z/ P5 X0 h& m$ z7 I .read=mcbsp_read,1 A* ^+ m* y, p- l1 M
};" m( ?) b& s3 V% B
static int __init MCBSP_init(void)
1 \2 Z2 X" l& q. L4 F0 Z9 H% r{, j9 o8 K. m) p! r+ P( T
int ret;: I/ n' @* ]. Z0 {* U
unsigned int PINMUX1_REG_old;
: m. G5 \0 k, c2 Z# u unsigned int PINMUX18_REG_old;# i+ s; S/ C/ K0 p: S, f6 g
unsigned int PINMUX19_REG_old;
! ?! X+ }5 b3 I, z7 j, [ M unsigned int temp;
]2 Z+ r0 x" F; h( R if(MCBSP_MAJOR)
) l) p* ]" Z, M* b _; D1 I9 i {
6 ~+ J' U$ x+ J mcbsp_dev=MKDEV(MCBSP_MAJOR,MCBSP_MINOR);! x9 _& n1 ?: m4 o
ret=register_chrdev_region(mcbsp_dev,count,MCBSP_NAME);) e+ L+ {+ D. a# j) B3 H' l: r3 K* o
}( R3 i% D9 d6 A/ I. Q' l7 a
else& y$ D1 c; z9 T. t2 t2 D. Q2 p
{% f; B+ I+ b) {/ u$ ~
ret=alloc_chrdev_region(&mcbsp_dev,MCBSP_MINOR,count,MCBSP_NAME);. ^; J3 C m* d) p
MCBSP_MAJOR=MAJOR(mcbsp_dev);; O" w; X. }1 q+ r+ P2 D/ e$ q
}. y/ v( Q' H% g
. P- }$ r8 Z2 Z
if(ret<0)
& [3 \% ^% M j& u7 c {
. @$ J" f% H" r$ U printk(KERN_ERR "register chrdev fail!");8 j" {4 p* ]* [ t* ?+ g
return -1;* c) o( Q8 \' G/ e! L% c# s
}
, ~) K( W9 L e; p; L. ]# ?1 F 9 Z0 K2 W0 ]# v+ f
mcbsp_cdev=cdev_alloc();
# b+ k& }' p6 @ # q9 A Z: M$ G( z! ^# a
if(mcbsp_cdev!=NULL)
8 I1 E' G2 }4 l" W) J: A {# r, _% S4 K! F% k! U# f
cdev_init(mcbsp_cdev,&mcbsp_fops);" }' |! y$ u; T! k+ x/ ? U$ k0 p
mcbsp_cdev->ops=&mcbsp_fops;
4 Q: L+ q% O& y5 q mcbsp_cdev->owner=THIS_MODULE;7 i, a, ]0 t6 c+ `# S# Q) R
& P) @! A, c3 E* \3 l( Q1 R+ [
if(cdev_add(mcbsp_cdev,mcbsp_dev,count))2 ^5 }$ f5 l( C% n0 b B5 a
printk(KERN_ERR "register cdev fail!");
, m, F0 n" o2 a else
) A c" y& a6 m' Q printk(KERN_ERR "register success!\n");! R9 H; j8 |: o: A
}/ e7 F8 N! z( X e7 ]+ L
else
8 ^! j8 c- d/ t( y( _: [ {
! k* l0 n3 j( n1 x7 G) M printk(KERN_ERR "register cdev err!");
' _; Z O+ a# b( Q& w5 Y return -1;7 O; w' G+ R0 A% F4 X5 _- Z
}
+ y6 U0 z c% l0 J ; y. @9 B. o+ D; J3 x: T8 F! |5 ` l
mcbsp_class=class_create(THIS_MODULE,MCBSP_NAME);
9 K, \* @3 _0 \( M! D0 C; L8 h if(IS_ERR(mcbsp_class))
; S4 `9 _8 P! h+ y/ H {
$ B/ t' v8 Y4 A, G printk(KERN_ERR "register class err!");
% H, c. j' D; C! d$ p return -1;- U1 _& o* n) ?2 F4 F
}
/ s* g/ ]# u: S# k0 }7 Y device_create(mcbsp_class,NULL,mcbsp_dev,NULL,MCBSP_NAME);- z9 b- [+ `% R9 c. U1 N2 B
% l7 Z+ Z0 [& B D# a1 T7 D/ T
//PSC
) ^5 |% f4 O* F //add Enable MCBSP( G6 N" ^* ?/ Q
//test$ `$ j2 m" C* B8 b6 }
temp = 0x80000003;; {! G8 L- E- p1 {
writel(temp, IO_ADDRESS(MDCTL15_ADDR));: ?8 f+ J- ^* O; y
temp = 0x00000003;
) d0 R" E, ] d3 l5 R: Y/ o writel(temp, IO_ADDRESS(PTCMD_ADDR));
' Q$ z# a7 w, y
+ v1 h7 j2 |) D( S temp = 0x001FF201;( s8 ]) b" ]* u$ F$ O
writel(temp, IO_ADDRESS(PDCTL1_ADDR));
; i* M" J/ c3 Q* T% J " F- O# @0 w. w* M8 N c; V
//PINMUX ! y3 l0 u" K* g, i. e
//MCBSP_CLK(receive/send),MCBSP_STRB(receive/send),MCBSP_DX,MCBSP_DR,
9 a4 t# n) E! g# |% e, K PINMUX1_REG_old=readl(IO_ADDRESS(SYSCFG_BASE)+PINMUX1_OFFSET);
6 z! N2 ^* E }3 C/ \ PINMUX1_REG_old=(PINMUX1_REG_old&0xf000000f)|0x02222220; ' n$ R$ P3 |. l9 J
writel(PINMUX1_REG_old, IO_ADDRESS(SYSCFG_BASE)+PINMUX1_OFFSET);$ k) i) G$ y* s6 X% Q4 u
+ f- Y4 P$ j" R/ _. Q8 ^9 r& [/ b8 ]: | //SLEEP_EN,EPR,L138_SHK1,L138_RC
/ e# w% r8 X1 Z# N% _8 ^( H I PINMUX18_REG_old=readl(IO_ADDRESS(SYSCFG_BASE)+PINMUX18_OFFSET); * M/ A; ` C& n( q$ F0 \9 ?( }& Y* j
PINMUX18_REG_old=(PINMUX18_REG_old&0x0000ffff)|0x88880000;
: M, {1 I) Z6 _* h/ w writel(PINMUX18_REG_old, IO_ADDRESS(SYSCFG_BASE)+PINMUX18_OFFSET);
6 R+ o! c5 O4 E+ G # Q3 `; [: O: x" v
//RESETn,L138_SHK2# }( c+ z) I4 B; z' V% r: n
PINMUX19_REG_old=readl(IO_ADDRESS(SYSCFG_BASE)+PINMUX19_OFFSET); & I* N2 S; }; s4 |6 K
PINMUX19_REG_old=(PINMUX19_REG_old&0xf0ffff0f)|0x08000080;
0 u4 D. i" f- l6 u9 ^8 R" e" Y# Z writel(PINMUX19_REG_old, IO_ADDRESS(SYSCFG_BASE)+PINMUX19_OFFSET);) _: s3 ?1 G s) B( c* `
# t/ {; s+ u0 Q5 B; t b4 n / Z" r1 e/ |. ]2 x
//SPCR Register
7 \" Y* G" c8 v //FREE-1,SOFT-1,FRST-0,GRST-0,XRST-0,RRST-0,RJUST-00(Zero-fill MSBs)reset8 l% O8 w: R/ r1 z) |4 x
temp = 0x03000000;//(DLB=0)$ l- i0 f! R8 o+ e3 R1 h8 Z
// temp = 0x03008000;//(DLB=1)
" b0 s' t9 @$ v7 O writel(temp,IO_ADDRESS(SPCR_ADDR)); //reset
5 L/ L/ j+ P4 B temp = readl(IO_ADDRESS(SPCR_ADDR));( f" S+ i- }/ D) n
printk("temp=%x\n",temp);, t# F5 T4 ~0 g6 [* T% E
: Z( @ Q- x7 u) B$ p9 N
//PCR Register
% t; f, s: p/ ~. j //FSXM-1,FSRM-1,CLKXM-1,CLKRM-1,SCLKME-0,FSXP-0,FSRP-0,CLKXP-0,CLKRP-07 l3 R: M' M8 s& L
// temp = 0x00000F0F;
0 t% B/ p: a/ w9 M. Y temp = 0x00000B0F;
% n# n6 @. [5 ?5 b! F writel(temp,IO_ADDRESS(PCR_ADDR)); //initialized ) ~4 \ M! e# ~5 O+ ^5 H- R
temp = readl(IO_ADDRESS(PCR_ADDR));( d7 Q. L- p* j) J% I# S
printk("temp=%x\n",temp); ; A! |1 @2 a9 Y2 I, J
//SRGR Register$ \/ b4 g% L& W. j0 |
//GSYNC-0,CLKSP-0,CLKSM-1,FPER-31,FWID-0,CLKGDV==11
2 L7 O G' `: H+ { //temp = 0x301F000B;7 X V- X! E) A
writel(0x0301F000B,IO_ADDRESS(SRGR_ADDR)); //initialized ! \4 `+ g8 f" S5 y1 z2 n1 l" p
temp = readl(IO_ADDRESS(SRGR_ADDR));
; t- G# F; P' @ printk("temp=%x\n",temp);
5 g& E. C: T, n/ p5 n% Z$ b //RCR
+ d5 m/ u m# O# R0 p% Q3 O //RPHASE-0,RFRLEN2-0,RWDLEN2-2,RCOMPAND-0,RFIG-1,% M( E5 r1 t {9 w+ D
//RDATDLY-0,RFRLEN1-0,RWDLEN1-2,RWDREVRS-0$ ]9 S3 C7 o: W) C' n; H
temp = 0x00440040;
6 W3 Q& g! E; m+ U: Y, \ writel(temp,IO_ADDRESS(RCR_ADDR)); //initialized & R% a J' s8 t& c+ L
temp = readl(IO_ADDRESS(RCR_ADDR));2 g: w v: [. S" o+ C& r( X
printk("temp=%x\n",temp);
% x2 p( O2 D& K9 Q5 H9 J3 N$ J1 M //XCR
& I; { f. G( b3 d( n //XPHASE-0,XFRLEN2-0,XWDLEN2-2,XCOMPAND-0,XFIG-1
; h! s6 ^3 K; U4 O: m9 _ //XDATDLY-0,XFRLEN1-0,XWDLEN1-2,XWDREVRS-0
8 `4 X' D ?; W1 \. n8 q9 z( F7 X) a temp = 0x00440040;
& @, y: }8 F3 l, ]5 Z0 e writel(temp,IO_ADDRESS(XCR_ADDR)); //initialized
& {& p. l2 E+ ^" o# G' \8 w temp = readl(IO_ADDRESS(XCR_ADDR));
( L' R2 t6 H( w5 j- |7 F; L printk("temp=%x\n",temp);- B) G+ e: j; I# U; }
udelay(100);) u" Z2 i% B& q! S) t
//SPCR Register1 g2 h- ?7 A+ c, m0 E& J: c* a& J- Z
//FREE-1,SOFT-1,FRST-1,GRST-1,XRST-1,RRST-1
+ _8 \/ m% D7 s9 O' n. V temp = 0x03C10001; //DLB = 0 VS DLB = 1+ ^, j' v0 p0 U) M
writel(temp,IO_ADDRESS(SPCR_ADDR)); //enabled
1 g; F3 M" ?2 l- { temp = readl(IO_ADDRESS(SPCR_ADDR));0 J, b0 F/ q: Z! y6 i
printk("temp=%x\n",temp);
+ s3 _' z! T, i/ [2 U udelay(100);0 g) O# y0 l& b% l- L7 k$ D
* `: M3 I) K# Q
//set GPIO direction+ o- S7 z7 l" B2 t( x6 v
temp = __raw_readl(IO_ADDRESS(GPIO8_DIRECT));
& T/ ^1 B3 F* d8 G temp = temp | 0x00000100;//EPR----input
9 T/ S' O( K3 B/ ]: J2 n. U& ? temp = temp&(~0x00000500);//RESETn,SLEEP_EN---output9 P4 B+ u F+ ^$ e8 J- {
__raw_writel(temp,IO_ADDRESS(GPIO8_DIRECT));
5 B3 I5 ~& B# K% q! H2 X: F! H : e6 _1 B8 J4 m0 H5 O3 y( a9 m
return 0;& M0 i% E) S$ `/ @
}
/ x& ~5 R+ [0 U4 a2 B# ~static void __exit MCBSP_exit(void)
- ^, b5 U* Z# }{6 U/ F) x6 Z& v' o
printk("mcbsp chrdev exit!\n");% p: K4 |& w1 l) A+ x+ M
cdev_del(mcbsp_cdev);( s C9 g. {) W1 t6 {
unregister_chrdev_region(mcbsp_dev,count);
0 O& @& M0 ?' K device_destroy(mcbsp_class,mcbsp_dev);7 q+ ^3 T7 |7 D
class_destroy(mcbsp_class);9 @" j; x3 e. _3 K) |
}/ N/ i- i% r8 J3 n o
module_init(MCBSP_init);
% a+ S! `* ~: v; wmodule_exit(MCBSP_exit);
3 o5 s: V+ }( I7 v1 v2 M. H8 ?! P3 R: Y1 I
MODULE_LICENSE("GPL");/ I9 Y- I- q- x4 r3 P
' ^* f g' Y9 l" q! R我讲上面的程序insmod之后我用示波器量 McBSP的发送时钟脚,发送数据脚(我还没有发送数据)以及发送同步脚,3个脚的信号是一样的,不管是用我自己的底板测试还是用创龙OMAPL38 的开发板测试,都是一样的,类似于噪声的信号时钟频率也不对。- [& `% p* @# n. ]
我的应用层的测试程序如下; D6 e. w4 A$ {! e
#include <stdio.h>
6 p! d" g6 w O; s$ K; m#include <string.h>
( J- [/ c# A* ]" j#include <fcntl.h>
+ C) b7 {6 D, d, S8 h#include <unistd.h>
8 e% [! ]% P$ x/ c! ] S5 I h1 E#include <signal.h> E$ w- ~0 p; H0 x
#include <pthread.h> //线程
2 L8 Q7 S# q7 j/ u6 b- m9 j#include <stdlib.h>
4 @# l4 c! |( h7 R#include <pcap.h> //捕获网口数据
* h5 v* }/ u7 e* W# s1 Y3 ^3 b#include <semaphore.h> //信号" j: T! p s5 R
#include <sys/types.h> //消息对列
# m8 t1 c1 X( `* Z' D' D#include <sys/ipc.h> //消息队列
8 F' I1 m3 Y) q+ K#include <sys/msg.h> //消息队列; ~1 j$ }* |/ k/ Y
#include <sys/select.h>
) e: g( F# R% Q. @! W) i, j J! o#include <sys/syscall.h>8 ]8 D* u5 l- N4 e3 ]
#include <sys/stat.h>, s2 h1 E' y& K0 q8 `% S$ j
#include <sys/mman.h>; U8 U+ F, ~/ h8 l- e6 G
#define msleep(x) usleep(1000*x)8 M% O- c3 ]' l
$ O# R' m4 L. a
int main()
( Z, P# {2 p& V{ 0 r% F) i4 Q; ^* ]- I
//MCBSP,ARM与AMBE2000交互设备! s/ E: D7 K) s L) L
int fd;( S' \/ L1 ^5 X: ]3 q' \
unsigned short data_write = 0x5555;
; ~5 _- d! ?% i& j) g7 Y; u) a: O unsigned short data_read = 0x00;5 s/ P6 b# f! O! J9 @+ D0 X( F
fd = open("/dev/MCBSP-device", O_RDWR | O_NONBLOCK | O_SYNC);
8 L3 R- }4 o4 q1 m9 V; L // fd = open("/dev/led-device", O_RDWR | O_NONBLOCK | O_SYNC);
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5 x; z, P! z3 N% p if(fd < 0): H- a% g3 _1 Q' f& L
{
: y, ]9 ]) h: l' H. N" A! t perror("open failed\n");$ A3 F$ y! ^+ Y9 E0 o
return -1;4 A2 X9 ]4 V1 E; g9 R
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while(1)
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; Q J1 Z( o. R$ a- ? //AMBE2000每次读写是24个字为一帧& b# e: r; Z7 S2 q" ^% n4 Z
//写数据时将数据在底层存储起来,等到中断的时候再发送
( M$ W8 ?) M! e: f: e //AMBE2000输入数据是以0x13EC开头的3 _0 {0 k/ k# s' o* r4 \6 `8 ~
write(fd,&data_write,sizeof(unsigned short));2 Z' S6 q3 e: E. `
7 ?' E5 _$ A- F% i4 L" C //读数据的时候,在底层中断中将接收到的数据存储起来,然后再传送到应用层
|2 q( `% i$ c read(fd,&data_read,sizeof(unsigned short));
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- d: M# \- Z# K4 k if(data_read == 0x13Ec)/ _; Q2 x7 V- ?( e8 d# H, |6 |
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6 P5 m$ C. S) C0 p) B1 B printf("data_read = %x\n",data_read);) I. k9 W, t9 C5 W2 h5 u) {/ C
}
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msleep(10);) P/ w0 z. ^5 I$ o. A9 J
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/*' I$ T2 v6 O% Q; H8 C/ c( l. g( m
ioctl(fd,1);
' [! |. @% p8 A: i7 g5 o sleep(1);2 y7 W* e( t, C9 V# j1 L
ioctl(fd,0);
! u( X# y$ l4 \" G* h sleep(1);
t* ?/ z3 Y% ^. Z: z4 v/ | */
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return 0;# U, J$ j( b Y: e7 j7 s
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, e1 x& G1 f/ i1 g多谢各位指教,谢谢! 急
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