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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:
# }, `# r& o7 c* a7 C/*
% ?/ ~* C9 i- U1 l# l0 O$ n# K * Copyright (C) 2009 Texas Instruments Inc
# ?8 H- h' r0 ~; h; t* p* e g *6 V& _- n9 E2 p2 f4 X C9 s+ e: v
* This program is free software; you can redistribute it and/or modify
" U0 j6 ]7 A9 n/ @& T * it under the terms of the GNU General Public License as published by
+ u; F! {, z O" H0 M) ] * the Free Software Foundation; either version 2 of the License, or
X* [) o ^7 w3 m8 ] * (at your option)any later version.
4 Y: S! n! q+ r# l/ U3 ?* S" w' s o */ X2 V7 H9 q- a+ o, F1 B$ x6 ?! }
* This program is distributed in the hope that it will be useful,
; E2 O1 ?0 c3 r * but WITHOUT ANY WARRANTY; without even the implied warranty of
" w$ d" s. f) ]9 i- p2 C * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the6 l9 X1 \/ n( r3 C J- h `& v' H4 u- P
* GNU General Public License for more details.# d" p1 p1 w0 I, b. |
*
- ]/ ~; ^% z$ T9 U. ~8 {+ p * You should have received a copy of the GNU General Public License w& y; a( o, r% \ I# D, k/ E
* along with this program; if not, write to the Free Software9 R, o' c' ~* M. [& K9 O
* Foundati
5 S' o. ]: s* r% X) o( B*/
2 g# O5 Q- P% q5 g. j+ P, d7 I#include <linux/module.h>
( h% V0 `( M" N1 b8 d9 I" W& N#include <linux/init.h>! w8 g8 M. b! @5 {' v
#include <linux/errno.h>
7 L$ j3 @ r3 [+ d T& _#include <linux/types.h>
; J! q. \( J6 I7 F: c( e' E0 Q/ @/ I#include <linux/interrupt.h>
: e* _/ t$ W1 V* z( E#include <linux/io.h>" E. c& Z4 ]: Q W* D% d1 Q
#include <linux/sysctl.h>0 u* @1 N% x8 b; H( a5 B" `
#include <linux/mm.h>
2 a' O1 Q# ^& `3 K$ k#include <linux/delay.h>
) m Q! K. W9 f" f#include<linux/kernel.h>
! ?. [% y4 j9 z7 F#include<linux/fs.h>
, z2 f) A! q2 C9 f#include<linux/ioctl.h>
: b! h$ ~* W2 j! p* y' F/ p$ Q8 c#include<linux/cdev.h>4 y4 U* e8 p) `: O1 ]
#include<linux/kdev_t.h>
4 n c& f) v' B Q: ]: J% S6 o) ^* e#include<linux/gpio.h>
% S& i1 x+ Y# ]; C' b$ _7 F" F#include <mach/hardware.h>
) u [& ~& d0 a#include <mach/irqs.h>! [9 F1 {) t2 B+ }+ @
5 }* K4 B9 C$ u. |" C+ S/ J6 Y
#include <asm/mach-types.h>
( h h* y8 v6 F% t% R: {: G B$ I$ e#include <asm/mach/arch.h>" ~3 Z9 `+ |$ H+ u, H
#include <mach/da8xx.h>; d5 x3 d4 d6 {; T6 N7 V) m7 O
#define SYSCFG_BASE 0x01c14000: @* {* T+ o7 B/ V7 U! o
#define PINMUX1_OFFSET 0x124 ; p4 h) u W% r; q
#define PINMUX18_OFFSET 0x168 ( m. X8 Z1 m% w3 {) T
#define PINMUX19_OFFSET 0x16c
$ N5 X9 @9 V# a' n#define SPCR_ADDR 0x01D11008 //MCBSP1_SPCR
# ?% K: l3 m( \" r5 K#define RCR_ADDR 0x01D1100C //MCBSP1_RCR" T8 k3 B; J) b
#define XCR_ADDR 0x01D11010 //MCBSP1_XCR
' J: G4 i' L7 J9 g#define SRGR_ADDR 0x01D11014 //MCBSP1_SRGR& F: V. W" Q; Y4 E" |
#define PCR_ADDR 0x01D11024 //MCBSP1_PCR
( `8 V. N4 U6 T" Z* s
9 o4 V+ ?1 A- ?1 g#define DXR_ADDR 0x01D11004 //MCBSP1_DXR
. T+ d. p+ @, N- [0 x& e#define DRR_ADDR 0x01D11000 //MCBSP1_DRR N' P9 R7 C7 s$ { n3 a% d0 ^
//PSC
* j; P; f8 w# d#define PTCMD_ADDR 0x01E27120 ( D3 w1 I" M7 p. U; a5 H; @/ w4 [6 ^
#define MDCTL15_ADDR 0x01E27A3C
6 D% `- Z1 a) r#define PDCTL1_ADDR 0x01E27304) e& @& L4 n J8 _& F
//GPIO8 direction
) L, S! O2 \, ^; |* ]4 m3 r#define GPIO8_DIRECT 0x01E260B0
4 ~4 t7 T/ o# `6 \7 L#define GPIO8_OUT 0x01E260B4
# T: L, a) a7 t$ B7 z+ f#define GPIO8_IN 0x01E260C0
* V* L) y6 r8 W: g. q- @( p: Q/ d- O
//#define MCBSP1_RINT 99 . d8 C+ y' @2 B* g8 E) N
//#define MCBSP1_XINT 100
3 x# {/ l& n; S |+ zstatic int MCBSP_MAJOR=239;
9 K, Y; P! D2 X$ ^ Gstatic int MCBSP_MINOR=0;; \# @7 k! _$ y9 K5 ?/ @
static int count =1;
$ f! ~# Q- p& t. g( v9 |& |5 Q: B5 P, Y5 m2 o F' E
#define MCBSP_NAME "MCBSP-device"
1 a, v, K8 B. y% g# f' \) F# R1 C7 q; F9 a8 X% J$ J/ B
static struct cdev *mcbsp_cdev; ]" X$ _( h4 w8 ~8 l* f% l
static struct class *mcbsp_class;% L3 ]8 g7 A7 Y" X9 V: q
static dev_t mcbsp_dev;- b, j6 b$ }- p8 r& j. s" `3 m0 j
unsigned int DRR_data;
9 j. O. Y. m; a0 n' a- r" X" tunsigned int DXR_data;8 R7 U: w7 m; o+ w
static int mcbsp_open(struct inode *inode,struct file *file)+ g& W/ @! [" O1 p
{. s A( H- G( O2 U& Y
6 _8 x3 j+ i0 F( f4 q. U: v //interrupt enable,initialized
' h7 v1 Z, g: D P# U2 C3 W @ unsigned int temp;
5 }+ M" h% i" ~7 p) _3 ~& a //SLEEP_EN(GPIO8[10])---0$ S0 H8 u4 U) x. v7 P
temp = __raw_readl(IO_ADDRESS(GPIO8_OUT));( [* Z) R7 n+ o# |
temp=temp&(~0x00000400);
! A$ s9 q7 |8 }% I __raw_writel(temp,IO_ADDRESS(GPIO8_OUT));//GPIO8[10]( Y: N- ]1 [+ z, f1 ^0 ` {
//RESETn(GPIO8[8])----0----1
9 x4 m& b& F' E; C temp = __raw_readl(IO_ADDRESS(GPIO8_OUT));
* ?+ N _0 y- J temp=temp&(~0x00000100);3 w9 H9 e- D) d6 T7 N: q
__raw_writel(temp,IO_ADDRESS(GPIO8_OUT));//GPIO8[8]---06 O# ` a' g+ w7 g
udelay(100);
7 a7 l* p2 e' o; F0 ?# O% j temp=temp| 0x00000100;/ O% F( M; M0 o; C3 }
__raw_writel(temp,IO_ADDRESS(GPIO8_OUT));//GPIO8[8]---1
8 j' w8 T; v* f' w6 {9 Y+ U udelay(100);
; l, f5 T' r- q* x printk("open success!\n");2 h- B7 m6 U5 Z( D, b! ]7 y9 t4 X
return 0;
4 \' H2 H8 j( x5 e1 f! H& h4 Q u}" j. {1 O0 J8 b3 F1 [7 X7 ]4 m
4 H& P6 i- v6 h" M( @
static int mcbsp_release(struct inode *inode,struct file *file)2 o" L5 {! x- T* B: r
{) g% J2 D+ M! } g) e& ^* _* k" H# J
printk("release success!\n");4 `( a6 Z" [# f# s+ ]
return 0;
4 h$ G, I; Y4 ^# a7 l}; I5 Q: ?- n' _
0 m0 k; @/ L, A/ D6 H6 b. G' Z+ L" L5 gstatic ssize_t mcbsp_write(struct file *filp,const char *buf,size_t len,loff_t *off)
* M f0 m0 R4 v2 ?{0 F. l- |1 m+ l1 K8 L
copy_from_user(&DXR_data,buf,len);
/ ~& I! a) Z J. i8 `& r- b iowrite32(DXR_data,IO_ADDRESS(DXR_ADDR)); & ~ I' a2 |( h% l5 M/ |6 ]
return 0;
: @, R$ o" c9 X2 g$ N
4 t+ {7 M9 D: p' A}
9 `* b" L- X$ l
0 `& e' V" G. b- h( p- R. V: Mstatic ssize_t mcbsp_read(struct file *filp,char *buf,size_t len,loff_t *off)
9 ` c% E+ p7 d( ^* n% C p{ ' L8 o5 J* J- N, V2 b4 n
DRR_data = ioread16(IO_ADDRESS(DRR_ADDR)); v/ x$ D) z- F% y, \
copy_to_user(buf,&DRR_data,len); ! t1 Y5 `/ m: O
return 0;% d- n2 N3 p4 B1 J" ~& j' p
}# H3 `. n1 Q6 O1 A5 M) n
: Y* U- d) t1 r- C# \
4 ]! j& x- m3 Q5 @5 U6 B2 f
static struct file_operations mcbsp_fops=
7 T/ W8 K& W) H* x{/ g3 B' ^# g5 E
.owner=THIS_MODULE,
. K: o, [2 q' P* `, j .open=mcbsp_open,' N, H$ S. G) n0 q
.release=mcbsp_release,) B5 l: H8 y! _' D( Z7 z/ a, L
.write=mcbsp_write,
# k6 `0 w9 I, G8 Z$ ^5 _ .read=mcbsp_read,6 V3 Y1 D8 V. _6 p0 v+ a. h W
};9 H8 ?. K+ O. s, b9 S) u6 a
static int __init MCBSP_init(void)- u# S9 O' b4 j- n3 G
{
) I, O) }* M, @. K/ H1 s int ret;$ ~) t. A3 p2 `, r
unsigned int PINMUX1_REG_old;
& K, o+ Q! [3 P9 O2 y unsigned int PINMUX18_REG_old;4 Z0 p5 E. o# c* P/ Z) {/ ^) o& O+ \
unsigned int PINMUX19_REG_old;
0 e/ J" L1 P7 o6 N/ l. r unsigned int temp;
( {' K$ {! S; D( \0 H. _ if(MCBSP_MAJOR)
0 L, }$ ?& u+ u3 x9 n; s {
( _! g% Z1 z9 j; j. h1 I# g mcbsp_dev=MKDEV(MCBSP_MAJOR,MCBSP_MINOR);
: k) C5 P( x) _. B ret=register_chrdev_region(mcbsp_dev,count,MCBSP_NAME);& D+ C5 v; Z M6 h4 L. w Q
}
9 Q N; I) T T9 R. H6 G1 @ else
& v; B+ b5 i X Y {
4 U! V, P1 \3 b8 V4 t5 o ret=alloc_chrdev_region(&mcbsp_dev,MCBSP_MINOR,count,MCBSP_NAME);
1 E9 P4 q7 F3 W* r! t MCBSP_MAJOR=MAJOR(mcbsp_dev);
6 I9 L! K+ K/ f0 h" \# J }2 f4 Z" C" M2 T, x# C
. [ _3 A# ]# P. G- d$ I# u4 E, O8 y if(ret<0); F$ i$ @2 k% k( d( r Z
{
0 M, p* c/ V8 t+ D( l3 Z printk(KERN_ERR "register chrdev fail!");' ?$ X0 z0 h5 @7 l7 O
return -1;
1 z) \* @! n' S6 N }
1 M, P0 Z* g z, X
1 G6 x+ ?8 g' d. i% Z4 [8 p u mcbsp_cdev=cdev_alloc();
$ a, ^4 ]/ D$ F9 D9 y5 j) m . N" g6 I2 C6 v' U, q( s0 m7 D8 W
if(mcbsp_cdev!=NULL)/ B4 {! Y5 P' W, U8 J
{8 |: a! U" U/ @& h: X' R
cdev_init(mcbsp_cdev,&mcbsp_fops);
1 o9 l J! ?2 B) M; ?& G3 e mcbsp_cdev->ops=&mcbsp_fops;' `' I% Y' F! l l, [- z
mcbsp_cdev->owner=THIS_MODULE;; S8 i7 y! p `2 J0 q* y; A
3 I5 k) X2 |1 [, B3 P/ Q
if(cdev_add(mcbsp_cdev,mcbsp_dev,count))- i X+ K- j( i+ g! P) C6 H% o
printk(KERN_ERR "register cdev fail!");9 V4 X, X4 g# }; n7 J& @) N- j+ v
else+ j( z& Y ?1 J4 C0 y# Q# J4 f) \
printk(KERN_ERR "register success!\n");
! [5 _, r7 S F$ F% S1 V, m }# M+ b. A2 H3 j! E1 M0 p& g
else, b4 |2 H! T5 m7 Q$ R" F
{
B, f1 O4 w+ L0 v printk(KERN_ERR "register cdev err!");
' E. m) O' l( j return -1;
" H/ L u2 ^5 k- I }
- W5 Q! P p% O: z
0 h) ~) |$ P( K" Z) x mcbsp_class=class_create(THIS_MODULE,MCBSP_NAME);7 x1 t: M# l/ Z/ d- ~
if(IS_ERR(mcbsp_class))$ r* Q/ m7 N, V7 K
{5 s2 ]+ t5 ? {' r/ H: b0 r; F
printk(KERN_ERR "register class err!");
0 X) t$ B2 }' e6 f+ c- @ return -1;
7 k) o9 E! r& j7 F/ { }8 R9 `9 K' G7 M! ]' y
device_create(mcbsp_class,NULL,mcbsp_dev,NULL,MCBSP_NAME);
$ u- a8 H2 `, J0 _4 f/ k( ^) W* ^" [4 y
//PSC% P9 y0 i, K* T+ J" f; I" r) T
//add Enable MCBSP/ N# d) M6 v8 N; D
//test% u" x+ A% ?; Y9 a2 M
temp = 0x80000003;8 E$ M0 M1 p) Y+ A
writel(temp, IO_ADDRESS(MDCTL15_ADDR));
" {0 z* m) z8 V0 b temp = 0x00000003;
/ N7 [' b7 k/ E# A2 N% w! F) _+ } writel(temp, IO_ADDRESS(PTCMD_ADDR));
' |. ]* ^5 H7 D* K : I/ @, L6 _- L; _ w, v
temp = 0x001FF201;2 C6 W; _, z/ \) E6 x( E
writel(temp, IO_ADDRESS(PDCTL1_ADDR));; Y5 |, n- K4 J2 C4 r8 X$ _
1 g" T- m6 P. C" V. [9 q! T3 C //PINMUX ; d4 Y% I) D: ]
//MCBSP_CLK(receive/send),MCBSP_STRB(receive/send),MCBSP_DX,MCBSP_DR,. S* w1 x% @2 S0 D5 V4 c8 x
PINMUX1_REG_old=readl(IO_ADDRESS(SYSCFG_BASE)+PINMUX1_OFFSET); & H5 E# |' I9 H$ j* J, D
PINMUX1_REG_old=(PINMUX1_REG_old&0xf000000f)|0x02222220;
- H+ w( c2 H3 N0 Z6 Q! {; y writel(PINMUX1_REG_old, IO_ADDRESS(SYSCFG_BASE)+PINMUX1_OFFSET);5 M+ L3 t1 x% Y# m0 @% M
9 ?. j8 f: ]: V) f4 M0 d //SLEEP_EN,EPR,L138_SHK1,L138_RC2 j3 [% J: ^; _; P: t8 J
PINMUX18_REG_old=readl(IO_ADDRESS(SYSCFG_BASE)+PINMUX18_OFFSET);
; X" r" q+ l8 U8 B5 V PINMUX18_REG_old=(PINMUX18_REG_old&0x0000ffff)|0x88880000;
- x4 j6 N1 H7 i8 [; i* B, B6 H* S writel(PINMUX18_REG_old, IO_ADDRESS(SYSCFG_BASE)+PINMUX18_OFFSET);
+ e3 Z4 l: Q2 z6 U8 }0 ~& f& C X 0 v0 T" x G3 z8 T9 _! q
//RESETn,L138_SHK2: F; G( G+ e1 i$ @* _* i: }! _
PINMUX19_REG_old=readl(IO_ADDRESS(SYSCFG_BASE)+PINMUX19_OFFSET);
' o) K5 X6 v- h; n. X% { PINMUX19_REG_old=(PINMUX19_REG_old&0xf0ffff0f)|0x08000080;
8 Q- H |! f* `/ Z writel(PINMUX19_REG_old, IO_ADDRESS(SYSCFG_BASE)+PINMUX19_OFFSET);/ G5 Q# h* K: F# ^ @- t6 V5 ^# c
: d9 b8 m3 j. o4 [4 A . L9 k9 z: s* s3 U7 I( n' ~
//SPCR Register
, m# [% f* A2 v4 ^ //FREE-1,SOFT-1,FRST-0,GRST-0,XRST-0,RRST-0,RJUST-00(Zero-fill MSBs)reset
- G. ~9 ]3 k$ N# p% k temp = 0x03000000;//(DLB=0)
. j% c3 X5 K/ ?/ X! p3 i // temp = 0x03008000;//(DLB=1); R+ m1 c- f* y: E: z
writel(temp,IO_ADDRESS(SPCR_ADDR)); //reset
7 V6 S9 `: R) ^1 n temp = readl(IO_ADDRESS(SPCR_ADDR));
/ F6 U& m4 K/ \2 t. n9 L- S, d, p printk("temp=%x\n",temp);
' E' V; B" C% l5 T5 H( q. V
0 C$ b( E; L# _- }1 T //PCR Register+ X2 r8 s/ T5 J2 m% O( ]4 b" R) e
//FSXM-1,FSRM-1,CLKXM-1,CLKRM-1,SCLKME-0,FSXP-0,FSRP-0,CLKXP-0,CLKRP-0
a5 h" [. [% S. {0 q) R; a7 m // temp = 0x00000F0F;' `7 T5 `5 {& l' i
temp = 0x00000B0F;
7 _8 \8 c6 l8 r writel(temp,IO_ADDRESS(PCR_ADDR)); //initialized + w9 m ~# L" n: x1 N7 [
temp = readl(IO_ADDRESS(PCR_ADDR)); J* r, Q# Q! [4 p& W. F
printk("temp=%x\n",temp);
( l/ [1 ^" w$ M //SRGR Register
! ~! J7 C* }4 Q //GSYNC-0,CLKSP-0,CLKSM-1,FPER-31,FWID-0,CLKGDV==11, b& |9 N+ |/ l0 p+ L) U e
//temp = 0x301F000B;
) s" V% i( A3 [0 K9 o writel(0x0301F000B,IO_ADDRESS(SRGR_ADDR)); //initialized
7 N; _, R0 m, J0 ^! m( c3 z temp = readl(IO_ADDRESS(SRGR_ADDR));
. B1 T, ]) q& A* k; ^6 k I printk("temp=%x\n",temp);
- G9 ?8 \0 p4 M: H //RCR1 @ j) E. Z% ]$ B/ g" x
//RPHASE-0,RFRLEN2-0,RWDLEN2-2,RCOMPAND-0,RFIG-1,
0 ^! S1 ?& r% c //RDATDLY-0,RFRLEN1-0,RWDLEN1-2,RWDREVRS-06 Q1 |$ S1 w. _( m1 L; I. B
temp = 0x00440040;' t+ s/ E6 _0 b! l9 I. j) K4 ^5 _
writel(temp,IO_ADDRESS(RCR_ADDR)); //initialized
9 [( H g- P$ b2 }8 O- n% F# g0 J temp = readl(IO_ADDRESS(RCR_ADDR));
% j/ r8 a: G. F printk("temp=%x\n",temp);1 Z1 Y) i) d+ h% _3 ] }
//XCR
9 [; `! [2 { w, g' ]( Z/ d, b: ` //XPHASE-0,XFRLEN2-0,XWDLEN2-2,XCOMPAND-0,XFIG-1
- ^; S/ o `$ L; { e //XDATDLY-0,XFRLEN1-0,XWDLEN1-2,XWDREVRS-0
4 t+ m# i" b5 Z temp = 0x00440040;) z! y- j: J) h0 l& S0 a
writel(temp,IO_ADDRESS(XCR_ADDR)); //initialized + Z# m2 ?2 i3 Z0 h6 N7 d
temp = readl(IO_ADDRESS(XCR_ADDR));
0 e t0 g; z; @' z printk("temp=%x\n",temp);
# K! Q8 u0 k, n% t: M+ x udelay(100);. L& {# w1 ?% f+ q' h/ Y
//SPCR Register8 F0 J2 u3 ^ ?0 V+ P
//FREE-1,SOFT-1,FRST-1,GRST-1,XRST-1,RRST-1
" h" x9 Q9 o- U: v; Y temp = 0x03C10001; //DLB = 0 VS DLB = 1) o9 y( p: p' J
writel(temp,IO_ADDRESS(SPCR_ADDR)); //enabled
% b9 G4 ]( f: F$ u1 N temp = readl(IO_ADDRESS(SPCR_ADDR));
$ \0 s2 w( V& V( R- Q" W/ G printk("temp=%x\n",temp);
+ g+ }& r5 h7 B3 ?: U udelay(100);, @/ s7 O- e! a2 B0 S' a1 W
. y' M' ?; Q9 a9 v @ //set GPIO direction7 E* v7 J- K3 k$ f
temp = __raw_readl(IO_ADDRESS(GPIO8_DIRECT));
) p+ D$ W- T- ] temp = temp | 0x00000100;//EPR----input
2 ]3 h3 @* o' ^9 K temp = temp&(~0x00000500);//RESETn,SLEEP_EN---output
2 O( V4 |7 E% X6 q m0 {6 o __raw_writel(temp,IO_ADDRESS(GPIO8_DIRECT)); ' J8 |9 R! B- M( {) D1 a
5 K) ?6 M- G& @; d
return 0;4 D1 N) b9 A- ~
}& V! r5 q0 }; Y' w+ X
static void __exit MCBSP_exit(void)) p6 h7 X9 H& D$ r: x; h3 m" A
{5 Y- l" |8 ?0 T) A
printk("mcbsp chrdev exit!\n");. ^* F8 g# ]) g: E; @
cdev_del(mcbsp_cdev);
7 T! ]2 j7 t* N; ? K/ t unregister_chrdev_region(mcbsp_dev,count);$ x# ~$ W z) `' u
device_destroy(mcbsp_class,mcbsp_dev);
/ ~9 K" u X' }+ j6 S" V class_destroy(mcbsp_class);1 ]( v6 u2 N5 C; V2 n5 y1 U
}
6 {3 H0 i+ H T& Tmodule_init(MCBSP_init);$ a% R5 O/ f4 K @
module_exit(MCBSP_exit);" @0 t8 K6 t6 s9 j9 y1 ]
3 T# F, h# X& C; YMODULE_LICENSE("GPL");
/ J; |; N7 h0 D/ A }" h5 ~; z
# J3 u" l% i- i) W: n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。
1 L1 e6 @. ]1 b8 |9 X! E/ w9 F1 @我的应用层的测试程序如下3 x# c, }4 B: Z& L2 e3 H
#include <stdio.h>3 { c6 z; V6 p Z& Z7 [( s1 ?5 l
#include <string.h>
0 h+ V) u+ \# j( n f6 P#include <fcntl.h>
/ N1 n; d2 I. C% h) J#include <unistd.h> [6 @9 _+ X% x, H* R
#include <signal.h>
1 k8 U; G; e! {' B#include <pthread.h> //线程
2 P( v" I% L5 _% V#include <stdlib.h>% P' P# x( U% y; V( H& D
#include <pcap.h> //捕获网口数据
6 ]' g. Y7 Y8 j) o0 ?) m g4 q#include <semaphore.h> //信号2 E6 A% i2 n8 e; K) T: P6 w9 q6 a
#include <sys/types.h> //消息对列
( R3 ~' _8 c v#include <sys/ipc.h> //消息队列5 K! I3 f/ g9 ]9 U8 |
#include <sys/msg.h> //消息队列' j3 y# f5 _' f1 H. Z
#include <sys/select.h>5 P1 B+ l9 n* v; }6 }8 x
#include <sys/syscall.h>
6 E- ~% ?1 V8 Q& g#include <sys/stat.h>. k6 z* u' b# R4 s/ @5 ?
#include <sys/mman.h>/ ^5 r. i/ E: I: }
#define msleep(x) usleep(1000*x)! b# j3 f9 w. C) M% M/ d* A
3 I9 p& d8 H1 J7 h0 J6 m: Cint main()# |8 s$ [, i2 o/ T
{
# ] y/ T1 o! o' @# e6 o) F //MCBSP,ARM与AMBE2000交互设备- R* ]/ {# y% W9 {
int fd;
5 @$ H! h3 b4 ~. n3 `2 _% r unsigned short data_write = 0x5555;$ y: ^! @) Q5 ~4 ^; Y, r; h. B
unsigned short data_read = 0x00;" l7 Y$ b6 {( @& G- A3 ?7 C
fd = open("/dev/MCBSP-device", O_RDWR | O_NONBLOCK | O_SYNC);
2 k9 q5 L2 E( L" r& u // fd = open("/dev/led-device", O_RDWR | O_NONBLOCK | O_SYNC);
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if(fd < 0)% X- h1 R& P* t( ^ @3 V Q
{
4 B* J2 K/ N. T perror("open failed\n");8 x7 e( o) Z- T# N0 ^3 b& M
return -1;
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/ x4 |$ x: t' o, e) z while(1)
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& @; E$ p9 _4 K+ I; C //AMBE2000每次读写是24个字为一帧4 \" M D' _( j# n& C& M
//写数据时将数据在底层存储起来,等到中断的时候再发送2 m1 d$ R Q. \
//AMBE2000输入数据是以0x13EC开头的 Q, {5 ]; o$ W, C: V4 x$ `
write(fd,&data_write,sizeof(unsigned short));7 N, }& W b9 u5 r j
$ h4 H, g' K& f4 [5 Q //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
- O) l2 A" Z! j6 Q; I) S2 q3 s read(fd,&data_read,sizeof(unsigned short));- D7 o! H6 B) N2 j, _9 L
% f: X% t' J" [: |/ _+ y if(data_read == 0x13Ec)8 y/ T, d2 x4 g
{
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5 G) I( I1 P1 ^$ w+ @( b4 G printf("data_read = %x\n",data_read);3 x: A# l; _! ]1 j I: J% g$ ~5 F
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# P: i& q9 U1 h. W, Z msleep(10);
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C& y e: w0 W) W /*6 I8 r, ? Z; P9 S: t/ s. E
ioctl(fd,1);
5 M9 O( j& S5 A9 U sleep(1);, \8 |" t+ A0 V# E* Z( @
ioctl(fd,0);$ ], ]+ }& D" f5 t- m0 Y$ E$ x
sleep(1);
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}
% d; s/ x9 L Y. ^ return 0;0 J P% z% k* s' o! G/ U
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6 F0 f; E' u2 S1 \多谢各位指教,谢谢! 急" `0 Z, s5 ?6 K: R
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