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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: ) A3 A! E7 ?: R+ C3 H6 C% K; }- ~
/*1 i8 g6 [# p- V
* Copyright (C) 2009 Texas Instruments Inc0 E7 q: |% A, o
*
/ g( k! H/ P* ~) l/ C * This program is free software; you can redistribute it and/or modify+ P/ L, ^ l& Z) h/ D% K
* it under the terms of the GNU General Public License as published by$ N% m+ o6 {5 J! S- `
* the Free Software Foundation; either version 2 of the License, or
% Z! f) D8 [6 L/ v$ V4 q * (at your option)any later version.( b2 y2 g, t5 V a
*
8 F5 X) o2 {/ M% I * This program is distributed in the hope that it will be useful,
. e) ?! Y1 {0 E+ c; k * but WITHOUT ANY WARRANTY; without even the implied warranty of
, {) G2 q2 U% V; v: n* A * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
7 H+ H" U8 C; M& q7 c * GNU General Public License for more details.1 H/ k( i2 f, t4 {) ~, Z
*
: I7 m7 K. k3 x) u; f0 ?3 G/ g * You should have received a copy of the GNU General Public License
! w2 j0 X- x# f, v, H T" b * along with this program; if not, write to the Free Software
7 B& [' Q1 ~) q8 l * Foundati; K. N% B5 E$ D3 Z T
*/4 T, \8 W4 I' ^" q
#include <linux/module.h>
1 v1 B6 R: u" d/ K% Q#include <linux/init.h>
, Y4 L9 v0 p" V7 E5 |) y* n& [#include <linux/errno.h>
0 O& l3 U, x7 f* x; n* H#include <linux/types.h>0 A. V e. a- `/ H1 L
#include <linux/interrupt.h>
$ A1 }. L3 [# c% L, M6 [- d3 ^# l- n3 G#include <linux/io.h>* E8 z2 p: Y. M8 \- ]' G
#include <linux/sysctl.h>5 K/ F& \+ E* i- R* y8 h% \& s
#include <linux/mm.h>; C2 T2 D$ f$ d Z3 m
#include <linux/delay.h>
- e+ o; C- H/ A6 l#include<linux/kernel.h>
" B! U) V a" O7 x+ ?) s, K#include<linux/fs.h>
/ |' C5 @+ i4 `/ H) L" O#include<linux/ioctl.h>
6 I8 R! S2 A) Q% K h#include<linux/cdev.h>" j" n/ Q1 @) d
#include<linux/kdev_t.h>& O( q3 {" V3 h
#include<linux/gpio.h>
, v9 U& H, Z0 D4 X3 @& l#include <mach/hardware.h>
; r X# ?6 U4 E, c7 h D#include <mach/irqs.h>- o8 z2 j) Q8 U, |
: x# F) t' M, Y#include <asm/mach-types.h>$ `2 B' ?/ }/ `( x
#include <asm/mach/arch.h>' |" ]8 o: D2 D$ @3 x
#include <mach/da8xx.h># G. }% D8 Z4 h1 E
#define SYSCFG_BASE 0x01c14000
! `6 P$ W0 k. n# _#define PINMUX1_OFFSET 0x124 # _4 W& j6 n$ B* E7 J7 N
#define PINMUX18_OFFSET 0x168 # x5 c! a4 m) g! Z
#define PINMUX19_OFFSET 0x16c& u0 B8 Q ~3 u" h8 A \2 a
#define SPCR_ADDR 0x01D11008 //MCBSP1_SPCR
$ q* L* `% p5 p) T6 p#define RCR_ADDR 0x01D1100C //MCBSP1_RCR1 h1 w" b. z z
#define XCR_ADDR 0x01D11010 //MCBSP1_XCR
3 \$ P8 U, h# p/ A$ q" t) K% y" N#define SRGR_ADDR 0x01D11014 //MCBSP1_SRGR
" T5 g& u+ q j$ e4 H: R#define PCR_ADDR 0x01D11024 //MCBSP1_PCR
# h1 u& ^" v5 } U8 o . a0 i0 N! L1 `. R; _
#define DXR_ADDR 0x01D11004 //MCBSP1_DXR
! a# g/ Y4 k7 q- R$ S4 D; |#define DRR_ADDR 0x01D11000 //MCBSP1_DRR! Q* v3 u, e' P @: Q
//PSC
6 N5 {3 J0 A+ Q9 S7 n( G, F+ }$ E#define PTCMD_ADDR 0x01E27120 ( ~! \. |$ }; `: l: [* ]: A6 U
#define MDCTL15_ADDR 0x01E27A3C
, r6 B, n/ y; I. a#define PDCTL1_ADDR 0x01E27304
) i7 k! p8 P' ]9 M, _' I//GPIO8 direction
, y/ @7 s5 J" Z+ X) }6 D#define GPIO8_DIRECT 0x01E260B0* N" G! F W5 ~7 n
#define GPIO8_OUT 0x01E260B4
* M- X* Y! G8 ^#define GPIO8_IN 0x01E260C0
3 L: k& [. R) H" q# x" s" i% Q9 d- D3 z; s5 ^/ o
//#define MCBSP1_RINT 99 - H6 S# @ S" j' b1 n
//#define MCBSP1_XINT 100 6 L* Y* s3 [6 o; _0 Z
static int MCBSP_MAJOR=239;. K* k* t; m7 T
static int MCBSP_MINOR=0;: t' a" c) \3 ~$ e: b
static int count =1;. r: G: m4 g% G
0 @7 T% d( I* J' u#define MCBSP_NAME "MCBSP-device"1 u+ @5 T) o$ D
+ @7 L. z" {5 D% [) r
static struct cdev *mcbsp_cdev;
4 X- z& F$ ~ k- Gstatic struct class *mcbsp_class;
& L. ~* T& z' U: u4 kstatic dev_t mcbsp_dev;
( f8 @+ b7 F# j+ E6 p2 d& v& k I6 Tunsigned int DRR_data;
2 W8 `) E8 s* |3 gunsigned int DXR_data;" i' K' K! W8 H7 H0 f* O
static int mcbsp_open(struct inode *inode,struct file *file)
' d: N8 a! ]: v1 z5 I [+ c" d0 U{8 V( g8 A" J8 i
' E- n: N) }/ b
//interrupt enable,initialized/ G' r. }0 o- Y( u! U
unsigned int temp;
9 \6 K: `7 F3 N; a0 W //SLEEP_EN(GPIO8[10])---0
! G( G2 h8 Z2 C+ ^9 r, M temp = __raw_readl(IO_ADDRESS(GPIO8_OUT));
" ?2 R- X) q- W! G, [ temp=temp&(~0x00000400);
1 u! K8 K- _- s/ U- N; g$ I$ [ {) c6 k __raw_writel(temp,IO_ADDRESS(GPIO8_OUT));//GPIO8[10]# C: @9 n0 ^- V( j# N
//RESETn(GPIO8[8])----0----1
& i: Z" ^3 f; G2 E1 k temp = __raw_readl(IO_ADDRESS(GPIO8_OUT));- h! K( i+ p% {5 ~7 S" X' Y K( V2 u
temp=temp&(~0x00000100);
$ Y" y$ Q8 n1 h. X! f1 a% ^ __raw_writel(temp,IO_ADDRESS(GPIO8_OUT));//GPIO8[8]---0
9 B+ B2 r+ n9 g. g) O- Z udelay(100);- V/ A+ Q/ [5 r4 ?9 z3 d/ }( V/ J
temp=temp| 0x00000100;
- P6 b6 A- t; V$ d6 P0 `1 y __raw_writel(temp,IO_ADDRESS(GPIO8_OUT));//GPIO8[8]---1
7 `* G) h: s5 {3 A7 v6 i udelay(100);' l O; H4 y4 t$ W! s
printk("open success!\n");
' W- [+ u, n- L% B; a2 _5 S return 0;( [4 G, T8 Q ^$ U: p4 @* K
} w+ @. ~- i- w. ^: Z5 y
% v+ F# C R, `8 I4 |% m
static int mcbsp_release(struct inode *inode,struct file *file)
( x# |4 q3 p9 H{
1 C* i0 Q8 ~" n5 d: _0 z, ~ printk("release success!\n");0 i8 d; W' Y( G! y" D3 x u, P
return 0;6 k" x# O7 F Z# \
}0 _: e' k" h9 U& E
% [" G0 A1 d! R/ m* G, I$ g! J
static ssize_t mcbsp_write(struct file *filp,const char *buf,size_t len,loff_t *off) P9 ]/ ^+ h' R
{' ~4 j$ e/ x# w* v3 h
copy_from_user(&DXR_data,buf,len);9 z6 Q5 Y" S9 F
iowrite32(DXR_data,IO_ADDRESS(DXR_ADDR)); % J1 j0 C6 ^2 k9 b
return 0;, F# D3 a, H! e3 S; y6 f3 H
2 y* e% v8 u% o+ I) D" H}
7 T$ _' ?( F5 f! O/ n
. W; a6 }9 e+ X: rstatic ssize_t mcbsp_read(struct file *filp,char *buf,size_t len,loff_t *off)
4 `; i# q. ^; M9 P5 e{ , `! G" u+ i) S+ o% H% s
DRR_data = ioread16(IO_ADDRESS(DRR_ADDR));" ^' F# n* |- K! U0 z
copy_to_user(buf,&DRR_data,len); 8 U, C) d5 ?1 \9 Z
return 0;7 ^6 ]: C: B9 l2 C+ v
}
# E: r @! W: o' m( S
! v7 Z* j& ^9 u
# U) _+ k" F# z8 L% c& ?4 E- [0 Estatic struct file_operations mcbsp_fops=# l: x- J' F# P) g4 {1 v- [
{
& ~ I; W" g& f8 _2 O- T .owner=THIS_MODULE,+ R+ y7 @# T* u! G8 i/ i3 Z6 G
.open=mcbsp_open,
/ s- o1 g- d# J9 t .release=mcbsp_release,0 h& f, d6 l5 f/ l
.write=mcbsp_write," N+ m8 ]0 w" X3 j* Q
.read=mcbsp_read,$ |8 j& i* W- ^; @0 ^
};, n6 e% C4 I8 B! R6 \5 \) M" ?$ j
static int __init MCBSP_init(void)
; n) {* {- N; {0 b4 y8 i{2 t* P/ @+ }) y& t1 c
int ret;( S$ H: Z0 T- m& G# U0 S# R
unsigned int PINMUX1_REG_old;
]1 |4 Q+ b" t5 h; l/ b/ U unsigned int PINMUX18_REG_old;
0 b) ]9 z' i/ G0 ~ unsigned int PINMUX19_REG_old;
; g7 |7 v3 y5 ` unsigned int temp;
+ C: g; p" P8 k' n3 s' S if(MCBSP_MAJOR)1 s% p5 i* m$ t/ d( b
{
3 ?5 P! A4 V- s8 ^, o mcbsp_dev=MKDEV(MCBSP_MAJOR,MCBSP_MINOR);
1 {/ H, W6 ]( X/ {( Y ret=register_chrdev_region(mcbsp_dev,count,MCBSP_NAME);8 c$ X D0 B2 J3 y* x( Q! N4 e
}7 V3 N, f5 `' N
else' }9 ^5 j# h6 D8 a" @5 x3 h! a' t
{
) z! @, p# X% o1 Q ret=alloc_chrdev_region(&mcbsp_dev,MCBSP_MINOR,count,MCBSP_NAME);
0 v7 Q! R( ?/ F& z/ O: r W/ G6 o MCBSP_MAJOR=MAJOR(mcbsp_dev);+ k. q) j. y5 e# P
}
1 u0 J! z' q1 m6 l
9 ^. \1 h [. d8 T$ P if(ret<0)
5 L1 J; X+ l2 O5 S$ u* \: W' G$ u/ m1 ^ {
7 _2 m9 J2 y F4 @& \ printk(KERN_ERR "register chrdev fail!");
( U/ G& m( c6 Y! M, y return -1;2 w4 p6 d) k0 ], V* z3 O8 l$ T
}& @$ r4 z5 {. G/ A' h# _7 D5 }
; Q3 A8 p- K; K* T7 w' E% q
mcbsp_cdev=cdev_alloc();0 m: l* e# P) d7 `
% p' H, {! ]" U6 z3 S5 p if(mcbsp_cdev!=NULL)7 |9 m' G1 w8 t# ^* C
{: B% L) O# r$ k8 U
cdev_init(mcbsp_cdev,&mcbsp_fops);/ l* T- @/ q' g
mcbsp_cdev->ops=&mcbsp_fops;2 f9 y5 r2 [& W( }
mcbsp_cdev->owner=THIS_MODULE;
1 t+ I2 v2 d5 ]( s- q/ V0 b" m% i" } 7 S+ Y# d. g4 X, M
if(cdev_add(mcbsp_cdev,mcbsp_dev,count))
5 F& D6 ` x& [9 {! K# J" g' P printk(KERN_ERR "register cdev fail!");
7 v% O T' L8 t% p( h else
3 V2 x- g; _- I! o2 O9 [! A printk(KERN_ERR "register success!\n");
+ { ^3 c9 Y6 V }
6 d/ @# k2 d6 R' [& [/ X0 b else* [; b$ ?1 [7 B! P
{
% G1 o9 K- g( {+ U. x, F4 d printk(KERN_ERR "register cdev err!");
5 ~; ^0 Y# {. y# q& T" Q' N; U return -1;1 P! I$ N% P! m* k+ l8 x
}
+ Q4 ^8 @$ p4 O2 P; | : r" k5 Q# }% i6 l9 E
mcbsp_class=class_create(THIS_MODULE,MCBSP_NAME);: X2 ?0 S- D8 [* I
if(IS_ERR(mcbsp_class))
/ N9 v' w8 I7 I+ N( ~* ~: Q {$ z) R, A8 I* s! F+ p T
printk(KERN_ERR "register class err!");. S" e% t7 T2 ~6 j1 ~
return -1;8 j) \4 M8 V/ J# g
}
+ @" }5 a" f; B* u device_create(mcbsp_class,NULL,mcbsp_dev,NULL,MCBSP_NAME);$ b& h2 ?9 a" _4 p, r
6 y. f* S$ |, ?8 F) y
//PSC
+ ]4 {1 I3 s! L) l% s //add Enable MCBSP3 r* f/ {: ?4 z5 @; |
//test: _, j8 D; t9 p- w6 A# ?5 F ?
temp = 0x80000003;; o0 r$ `4 K6 W" b
writel(temp, IO_ADDRESS(MDCTL15_ADDR));5 S4 S1 m$ p* s
temp = 0x00000003;
Y: ^1 @, W& O0 E; `; a# o0 h writel(temp, IO_ADDRESS(PTCMD_ADDR));
5 t6 Y* v' G# O) E2 ?
u4 n2 t* O9 B+ g( J temp = 0x001FF201;+ L2 u+ ~0 i, i% s4 M: z5 ]
writel(temp, IO_ADDRESS(PDCTL1_ADDR));
9 ?) h8 r8 T3 x& v* y# y% z
! d( L2 U- q0 U5 C' I //PINMUX
: U0 y' P( N( o! y, Y, }+ I4 [5 H //MCBSP_CLK(receive/send),MCBSP_STRB(receive/send),MCBSP_DX,MCBSP_DR, H8 }7 ^, d0 F
PINMUX1_REG_old=readl(IO_ADDRESS(SYSCFG_BASE)+PINMUX1_OFFSET); : _ J) Y9 ?% D
PINMUX1_REG_old=(PINMUX1_REG_old&0xf000000f)|0x02222220;
, S( Q1 s% u8 L7 q6 a3 i5 l4 } writel(PINMUX1_REG_old, IO_ADDRESS(SYSCFG_BASE)+PINMUX1_OFFSET);
% K7 k& X9 Y" r7 u8 I
1 J6 q# [" {* _' k4 a: d //SLEEP_EN,EPR,L138_SHK1,L138_RC% e, d+ s+ y5 \0 `0 k
PINMUX18_REG_old=readl(IO_ADDRESS(SYSCFG_BASE)+PINMUX18_OFFSET); 9 f5 Q' ?/ `# K
PINMUX18_REG_old=(PINMUX18_REG_old&0x0000ffff)|0x88880000;
, m4 \+ m* T, G' `9 O# U writel(PINMUX18_REG_old, IO_ADDRESS(SYSCFG_BASE)+PINMUX18_OFFSET);
) ]3 s% @- a9 H
+ ? V/ u! B- }+ R3 u; S //RESETn,L138_SHK2
9 u2 _0 s7 ~ ~$ b- m PINMUX19_REG_old=readl(IO_ADDRESS(SYSCFG_BASE)+PINMUX19_OFFSET); ' X- O2 W1 {' j/ |0 S2 L
PINMUX19_REG_old=(PINMUX19_REG_old&0xf0ffff0f)|0x08000080;
0 O n O' M1 h8 h7 X- k5 v writel(PINMUX19_REG_old, IO_ADDRESS(SYSCFG_BASE)+PINMUX19_OFFSET);
8 x! x- ^: F8 |) s* e- e
' _0 R$ @/ ]) z0 _2 S2 g! ]
8 B" j8 X& r8 X; y7 v //SPCR Register. d/ w* v, U1 u# O; V! Z3 v
//FREE-1,SOFT-1,FRST-0,GRST-0,XRST-0,RRST-0,RJUST-00(Zero-fill MSBs)reset
. R) N5 Q0 s& M4 J: ]$ H temp = 0x03000000;//(DLB=0)
" Z0 p% A/ B( ^. a // temp = 0x03008000;//(DLB=1)8 Q, ]! V" r2 K+ D$ Z
writel(temp,IO_ADDRESS(SPCR_ADDR)); //reset; s- O- c+ T' }: N
temp = readl(IO_ADDRESS(SPCR_ADDR));% \ z5 j" O1 Z8 w1 n
printk("temp=%x\n",temp);* c( c5 y' L! X
, z, z" Q6 b/ ^1 ]& y2 M
//PCR Register0 o/ C$ J+ o+ c: m. ^0 W# d
//FSXM-1,FSRM-1,CLKXM-1,CLKRM-1,SCLKME-0,FSXP-0,FSRP-0,CLKXP-0,CLKRP-0
3 |; ]" K2 k6 @9 s- ]4 K+ d // temp = 0x00000F0F;% ^5 w. q3 i) {9 _+ @" W: @
temp = 0x00000B0F;
, X7 K8 U n/ N writel(temp,IO_ADDRESS(PCR_ADDR)); //initialized % L: c: g/ ?8 d9 @+ |6 H
temp = readl(IO_ADDRESS(PCR_ADDR));: E; Z3 v3 Z. s( J
printk("temp=%x\n",temp); 3 e) W8 ]: e! u4 X+ k
//SRGR Register! Y2 U: r3 y: c& o( g
//GSYNC-0,CLKSP-0,CLKSM-1,FPER-31,FWID-0,CLKGDV==11$ a# u" o1 ]; P+ P- l* k+ I
//temp = 0x301F000B;
) T: w, w2 c5 C, [2 _ ? writel(0x0301F000B,IO_ADDRESS(SRGR_ADDR)); //initialized
/ R" C) g+ j$ b. t3 [/ g temp = readl(IO_ADDRESS(SRGR_ADDR));
8 y+ Y8 g5 m* P% O printk("temp=%x\n",temp);
/ h/ `5 S: p! E- `5 Q6 o //RCR: p- q: Z0 N' t& Y3 G
//RPHASE-0,RFRLEN2-0,RWDLEN2-2,RCOMPAND-0,RFIG-1,) E4 `4 a+ t8 N) s5 ~4 z6 E5 u
//RDATDLY-0,RFRLEN1-0,RWDLEN1-2,RWDREVRS-0
, A$ u% j- o; V- @ temp = 0x00440040;5 a+ [' ^9 V Q+ l8 ^9 `4 B8 F
writel(temp,IO_ADDRESS(RCR_ADDR)); //initialized 4 k1 f5 n9 w6 u m
temp = readl(IO_ADDRESS(RCR_ADDR));
' f. t0 B( v9 \ printk("temp=%x\n",temp);: `# h, U5 @, n) _8 W* R
//XCR
3 P+ L* n5 Y6 y! v1 n" e W& V% Z( a //XPHASE-0,XFRLEN2-0,XWDLEN2-2,XCOMPAND-0,XFIG-1
5 ]4 v8 `/ e9 `! U) D+ K* d( J9 h //XDATDLY-0,XFRLEN1-0,XWDLEN1-2,XWDREVRS-07 h" [* A2 R7 H; f3 }0 e
temp = 0x00440040;5 G( ? D5 K8 F% O* r. h' c9 r* U
writel(temp,IO_ADDRESS(XCR_ADDR)); //initialized
6 b( S+ W6 `' q temp = readl(IO_ADDRESS(XCR_ADDR));
1 b1 P3 z+ X4 I* @+ V$ L4 v printk("temp=%x\n",temp);. `; k4 C, x! B0 F* v! F
udelay(100);
. D- \9 V/ g" w7 W //SPCR Register
2 B( q2 T; l& C d8 v( { //FREE-1,SOFT-1,FRST-1,GRST-1,XRST-1,RRST-1
2 h7 A9 a( ^! ~$ N/ `" \. ] temp = 0x03C10001; //DLB = 0 VS DLB = 1
0 P5 m1 G8 D- g9 t# F+ J2 Q writel(temp,IO_ADDRESS(SPCR_ADDR)); //enabled# e4 K" U* h4 Z u: q5 u# f" l( n
temp = readl(IO_ADDRESS(SPCR_ADDR));$ |+ S" A$ _; H( J
printk("temp=%x\n",temp);* w% P0 j8 J! M* V- T }% D
udelay(100);2 d2 C! J0 s7 P# v$ d
8 P6 q! u/ i0 C- I, [ //set GPIO direction1 |+ K% m& i# |8 ~: k' V
temp = __raw_readl(IO_ADDRESS(GPIO8_DIRECT));8 _# u5 v7 G1 B- q
temp = temp | 0x00000100;//EPR----input
4 u9 B3 C( B2 R" J temp = temp&(~0x00000500);//RESETn,SLEEP_EN---output
* x" x1 I- ]; `: t C) U __raw_writel(temp,IO_ADDRESS(GPIO8_DIRECT));
6 L( C; H, a" z U 1 v1 } ^) x) i/ e% m
return 0;$ w( p# ?3 L& u% U; \7 T$ j) I
}
[: ?! D" x$ `" m# Ystatic void __exit MCBSP_exit(void)
, R0 u6 V4 ?- a. {# `& e{
, A9 F' y& Z9 u7 M/ v; k printk("mcbsp chrdev exit!\n");
_# C' C" S1 N9 B* u cdev_del(mcbsp_cdev);
: G& t; k, E, n0 v/ C4 D unregister_chrdev_region(mcbsp_dev,count);
& b( v- \9 F! f& j$ \0 h4 _ device_destroy(mcbsp_class,mcbsp_dev);9 v* ^' R' w& K8 O: `' k
class_destroy(mcbsp_class);! |! M; A1 a, \' M
}
# I) i5 H2 z: K+ omodule_init(MCBSP_init);
# W9 O. _" z( q1 H2 Q4 l wmodule_exit(MCBSP_exit);6 K& B' z9 l& }" k @3 V& E( Q
# y6 H @7 X+ P: S! L6 s
MODULE_LICENSE("GPL");
5 l+ e; S K* b" f v. p- r
* e. a1 Y- e. [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。" J7 z. f2 J6 Q
我的应用层的测试程序如下& ~" v) v- |* I* Z
#include <stdio.h>+ a2 r6 Z0 B% c" \7 k& E6 J; L( o
#include <string.h>
0 Z; U5 `, H M) ^#include <fcntl.h>& D1 ]8 c5 o. X5 {, d: g4 p' }
#include <unistd.h>3 R) ~# i2 F5 V8 b- |9 o9 @
#include <signal.h>& ~$ B ]# @3 `
#include <pthread.h> //线程
1 j2 p. o' ]9 k+ c6 q. Q5 X#include <stdlib.h>5 ^* \6 d( \7 I7 Z8 ~
#include <pcap.h> //捕获网口数据
: E+ F( V# z B, y2 J#include <semaphore.h> //信号4 o2 |5 Z! g/ p7 P5 a
#include <sys/types.h> //消息对列 Z1 B9 U% V; h- n
#include <sys/ipc.h> //消息队列; [1 W2 O2 h) B5 q) |
#include <sys/msg.h> //消息队列4 d+ s% b- C/ h4 H* ~6 O
#include <sys/select.h>8 L: `8 |3 f [' H" A4 T( g! K
#include <sys/syscall.h>( E; m5 J( R( }! n0 K
#include <sys/stat.h>& x4 s1 {& m" U6 }6 o% X( @
#include <sys/mman.h>* r* ]# E. W! B( M, |
#define msleep(x) usleep(1000*x)
5 _: l' X; ^6 C. S8 y* p
2 u* S& c2 g' {, V7 U$ E+ m3 V0 \int main()- v' D) A2 i& M8 h
{
+ {: s8 l# T V3 p. U //MCBSP,ARM与AMBE2000交互设备 a/ Y. }- c2 h
int fd;
9 U! x: `' E/ g9 ~8 w T/ \ unsigned short data_write = 0x5555;4 n. R; {8 m4 [
unsigned short data_read = 0x00;: ]; o+ Y( H4 x/ _9 ]3 p* n% E
fd = open("/dev/MCBSP-device", O_RDWR | O_NONBLOCK | O_SYNC);
+ Q* [: @% x2 i( |( V // fd = open("/dev/led-device", O_RDWR | O_NONBLOCK | O_SYNC);
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3 ?4 X4 Q+ Y" T6 @& M x/ i5 |+ ] if(fd < 0)
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0 A2 V" R1 ?! |; C perror("open failed\n");$ h, a3 N/ R5 Y9 `- i
return -1;
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- e& I8 Q/ [. D) q& _7 h! [- k while(1)# e7 Z# Z* m. Z* e
{
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//AMBE2000每次读写是24个字为一帧
: d/ z$ F3 `- ?5 D! N; y ]# E5 g- k //写数据时将数据在底层存储起来,等到中断的时候再发送" s1 ?! O, H; [# O0 N
//AMBE2000输入数据是以0x13EC开头的1 }7 p( G L) }% c7 o$ o9 m- Q' ], Q, }
write(fd,&data_write,sizeof(unsigned short));
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6 j5 E$ D3 X3 C: i0 W! y* y2 a' z* |6 j0 i //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 # m3 j: B0 A* W" K6 `
read(fd,&data_read,sizeof(unsigned short));
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# F8 O" o ^0 Z1 k2 e, a if(data_read == 0x13Ec)
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/ Z8 o5 v6 Z9 _8 p4 I6 o$ l printf("data_read = %x\n",data_read);
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. K: t d! _8 {" B% p8 u. o msleep(10);: u" t: _4 k/ w/ g
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/*" ?! ^3 o$ s' i
ioctl(fd,1); . Z0 I5 i' r0 e' _7 S3 _5 l: W
sleep(1);7 a7 D3 x5 v2 u9 J+ A6 L/ x l
ioctl(fd,0);1 w5 ` `1 Q% G. q- u
sleep(1);, K+ l" A% b' N/ B# z: ?2 ?/ Z
*/ & W- T% n& G' C% A4 [, j
} ; M4 V1 @( f R
return 0;
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9 u) F5 j" z# M$ n+ z) d o) @多谢各位指教,谢谢! 急
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