驅動的簡單測試

CF1、驅動的簡單測試
在上一篇文章中，我們已經把添加驅動模塊做完了，並把驅動下載到了板子上。下面將介紹一下如何測試驅動是否正常。

這個ttt驅動，我們實現了一個讀、一個寫的接口，就此進行簡單的測試：

啟動板子，進入系統，然後進入命令行（可以用串口，也可以用adb shell）

進入dev目錄：

 這裡就可以說明： ttt 設備文件已經OK了，輸入輸出接口都沒有問題。

當然，這裡還有其他的方式去驗證這個輸入輸出，如：

進入到 /sys/class 的 ttt 設備目錄下：

 
power 
subsystem 
uevent 
 power
subsystem
uevent
val
 

2、編寫C程序來測試驅動的讀寫
切換到root權限，並進入到android源碼目錄下的 external 目錄：

antlr           fsck_msdos               libvpx         skia 
apache-harmony  genext2fs                libxml2        sonivox 
apache-http     giflib                   libxslt        speex 
apache-xml      google-diff-match-patch  libyuv         sqlite 
astl            grub                     llvm           srec 
bison           gtest                    lohit-fonts    srtp 
blktrace        guava                    markdown       stlport 
bluetooth       harfbuzz                 mesa3d         strace 
bouncycastle    hyphenation              mksh           svox 
bsdiff          icu4c                    mockwebserver  tagsoup 
bzip2           iproute2                 mtpd           tcpdump 
chromium        ipsec-tools              netcat         tinyalsa 
clang           iptables                 netperf        tinyxml 
collada         javasqlite               neven          tremolo 
dbus            javassist                nist-sip       v8 
dhcpcd          jdiff                    oauth          valgrind 
dnsmasq         jhead                    opencv         webkit 
doclava         jpeg                     openssl        webp 
dropbear        jsilver                  oprofile       webrtc 
e2fsprogs       jsr305                   pcre           wpa_supplicant 
easymock        junit                    ping           wpa_supplicant_6 
elfutils        kernel-headers           ping6          wpa_supplicant_8 
embunit         libffi                   ppp            xmlwriter 
emma            libgsm                   proguard       yaffs2 
esd             liblzf                   protobuf       yapp 
expat           libnfc-nxp               qemu           zlib 
eyes-free       libnl-headers            qemu-pc-bios 
fdlibm          libpcap                  quake 
flac            libphonenumber           replicaisland 
android-mock    freetype                 libpng         safe-iop
antlr           fsck_msdos               libvpx         skia
apache-harmony  genext2fs                libxml2        sonivox
apache-http     giflib                   libxslt        speex
apache-xml      google-diff-match-patch  libyuv         sqlite
astl            grub                     llvm           srec
bison           gtest                    lohit-fonts    srtp
blktrace        guava                    markdown       stlport
bluetooth       harfbuzz                 mesa3d         strace
bouncycastle    hyphenation              mksh           svox
bsdiff          icu4c                    mockwebserver  tagsoup
bzip2           iproute2                 mtpd           tcpdump
chromium        ipsec-tools              netcat         tinyalsa
clang           iptables                 netperf        tinyxml
collada         javasqlite               neven          tremolo
dbus            javassist                nist-sip       v8
dhcpcd          jdiff                    oauth          valgrind
dnsmasq         jhead                    opencv         webkit
doclava         jpeg                     openssl        webp
dropbear        jsilver                  oprofile       webrtc
e2fsprogs       jsr305                   pcre           wpa_supplicant
easymock        junit                    ping           wpa_supplicant_6
elfutils        kernel-headers           ping6          wpa_supplicant_8
embunit         libffi                   ppp            xmlwriter
emma            libgsm                   proguard       yaffs2
esd             liblzf                   protobuf       yapp
expat           libnfc-nxp               qemu           zlib
eyes-free       libnl-headers            qemu-pc-bios
fdlibm          libpcap                  quake
flac            libphonenumber           replicaisland
 

[cpp]
#include <stdio.h>  
#include <stdlib.h>  
#include <fcntl.h>  
 
#define DEVICE_NAME     "/dev/ttt"  
 
int main(int argc, char** argv) 
{ 
    int fd = -1; 
    int val = 0; 
    fd = open(DEVICE_NAME, O_RDWR); 
    if(fd == -1){ 
        printf("Failed to open device %s.\n", DEVICE_NAME); 
        return -1; 
    } 
     
    printf("Read original value:\n"); 
    read(fd, &val, sizeof(val)); 
    printf("%d.\n\n", val); 
     
    val = 100; 
    printf("Write value %d to %s.\n\n", val, DEVICE_NAME); 
    write(fd, &val, sizeof(val)); 
     
    printf("Read the value again:\n"); 
    read(fd, &val, sizeof(val)); 
    printf("%d.\n\n", val); 
     
    close(fd); 
     
    return 0; 
} 

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>

#define DEVICE_NAME  "/dev/ttt"

int main(int argc, char** argv)
{
 int fd = -1;
 int val = 0;
 fd = open(DEVICE_NAME, O_RDWR);
 if(fd == -1){
  printf("Failed to open device %s.\n", DEVICE_NAME);
  return -1;
 }
 
 printf("Read original value:\n");
 read(fd, &val, sizeof(val));
 printf("%d.\n\n", val);
 
 val = 100;
 printf("Write value %d to %s.\n\n", val, DEVICE_NAME);
 write(fd, &val, sizeof(val));
 
 printf("Read the value again:\n");
 read(fd, &val, sizeof(val));
 printf("%d.\n\n", val);
 
 close(fd);
 
 return 0;
}

創建對應的Android.mk配置文件：

[plain]
root@brantyou-ubuntu:~/workspace/android-4.0.4_r1.2/external/yapp/tttapp# gedit Android.mk 

root@brantyou-ubuntu:~/workspace/android-4.0.4_r1.2/external/yapp/tttapp# gedit Android.mk
Android.mk 文件內容如下：

[cpp] view plaincopyprint?LOCAL_PATH := $(call my-dir) 
include $(CLEAR_VARS) 
LOCAL_MODULE_TAGS := optional 
LOCAL_MODULE := tttapp 
LOCAL_SRC_FILES := tttapp.c 
include $(BUILD_EXECUTABLE) 

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := optional
LOCAL_MODULE := tttapp
LOCAL_SRC_FILES := tttapp.c
include $(BUILD_EXECUTABLE)
C程序編寫完了，下面進行編譯：

回到android的源碼目錄，並執行envsetup.sh：

[plain]
root@brantyou-ubuntu:~/workspace/android-4.0.4_r1.2# ls 
abi       build        device      hardware  out       system 
bionic    cts          docs        libcore   packages  v8.log 
bootable  dalvik       external    Makefile  prebuilt  vendor 
boot.img  development  frameworks  ndk       sdk 
root@brantyou-ubuntu:~/workspace/android-4.0.4_r1.2# . build/envsetup.sh  
including device/moto/stingray/vendorsetup.sh 
including device/moto/wingray/vendorsetup.sh 
including device/samsung/crespo4g/vendorsetup.sh 
including device/samsung/crespo/vendorsetup.sh 
including device/samsung/maguro/vendorsetup.sh 
including device/samsung/smdkc110/vendorsetup.sh 
including device/samsung/smdkv210/vendorsetup.sh 
including device/samsung/torospr/vendorsetup.sh 
including device/samsung/toro/vendorsetup.sh 
including device/samsung/tuna/vendorsetup.sh 
including device/ti/panda/vendorsetup.sh 
including sdk/bash_completion/adb.bash 
including device/moto/stingray/vendorsetup.sh
including device/moto/wingray/vendorsetup.sh
including device/samsung/crespo4g/vendorsetup.sh
including device/samsung/crespo/vendorsetup.sh
including device/samsung/maguro/vendorsetup.sh
including device/samsung/smdkc110/vendorsetup.sh
including device/samsung/smdkv210/vendorsetup.sh
including device/samsung/torospr/vendorsetup.sh
including device/samsung/toro/vendorsetup.sh
including device/samsung/tuna/vendorsetup.sh
including device/ti/panda/vendorsetup.sh
including sdk/bash_completion/adb.bash============================================ 
PLATFORM_VERSION_CODENAME=REL 
PLATFORM_VERSION=4.0.4 
TARGET_PRODUCT=full 
TARGET_BUILD_VARIANT=eng 
TARGET_BUILD_TYPE=release 
TARGET_BUILD_APPS= 
TARGET_ARCH=arm 
TARGET_ARCH_VARIANT=armv7-a 
HOST_ARCH=x86 
HOST_OS=linux 
HOST_BUILD_TYPE=release 
BUILD_ID=IMM76I 
============================================ 
target thumb C: tttapp <= external/yapp/tttapp/tttapp.c 
target Executable: tttapp (out/target/product/generic/obj/EXECUTABLES/tttapp_intermediates/LINKED/tttapp) 
target Symbolic: tttapp (out/target/product/generic/symbols/system/bin/tttapp) 
target Strip: tttapp (out/target/product/generic/obj/EXECUTABLES/tttapp_intermediates/tttapp) 
Install: out/target/product/generic/system/bin/tttapp 
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=4.0.4
TARGET_PRODUCT=full
TARGET_BUILD_VARIANT=eng
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a
HOST_ARCH=x86
HOST_OS=linux
HOST_BUILD_TYPE=release
BUILD_ID=IMM76I
============================================
target thumb C: tttapp <= external/yapp/tttapp/tttapp.c
target Executable: tttapp (out/target/product/generic/obj/EXECUTABLES/tttapp_intermediates/LINKED/tttapp)
target Symbolic: tttapp (out/target/product/generic/symbols/system/bin/tttapp)
target Strip: tttapp (out/target/product/generic/obj/EXECUTABLES/tttapp_intermediates/tttapp)
Install: out/target/product/generic/system/bin/tttapp
root@brantyou-ubuntu:~/workspace/android-4.0.4_r1.2#
這樣就表示編譯成功了，我們看一下這個對應的執行程序是否已經生成：

[plain]
root@brantyou-ubuntu:~/workspace/android-4.0.4_r1.2# ls -l out/target/product/generic/system/bin/tttapp  
-rwxr-xr-x 1 root root 5524 2013-04-02 11:04 out/target/product/generic/system/bin/tttapp 
root@brantyou-ubuntu:~/workspace/android-4.0.4_r1.2#  

root@brantyou-ubuntu:~/workspace/android-4.0.4_r1.2# ls -l out/target/product/generic/system/bin/tttapp
-rwxr-xr-x 1 root root 5524 2013-04-02 11:04 out/target/product/generic/system/bin/tttapp
root@brantyou-ubuntu:~/workspace/android-4.0.4_r1.2# 這樣就表示生成了對應的 可執行程序。

 好，現在我們把這個生成的 tttapp 程序拷貝到 SD卡上，然後放到板子上去執行。

我這裡是放到了U盤上面，從U盤中把tttapp 拷貝到板子上的/data目錄中去：

[plain]
root@android:/mnt # ls usb 
D3GOther.exe 
EBOOT.bin 
EBOOT.nb0 
IRDA_X.exe 
LOST.DIR 
MapTools.exe 
NK.BIN 
NK_2G.bin 
NK_3G.bin 
NK_3G_y.BIN 
NK_src.bin 
RFIDForProduce.exe 
RFIDTest.exe 
RFID_X.exe 
STEPLDR.bin 
STEPLDR.nb0 
SwitchTools.exe 
WINCE 6软件 
android-samsung-dev_20110830.tar.gz 
barscan.exe 
bbk 
hello 
htcbjwdm.inf 
tttapp 
ubuntu-11.10-desktop-i386.iso 
凯立德地图 
机身å·ç (MC60端).exe 
root@android:/mnt # 
root@android:/mnt # ls 
asec 
ext_sd 
obb 
sdcard 
secure 
usb 
root@android:/mnt # cd usb/ 
root@android:/mnt/usb # ls 
D3GOther.exe 
EBOOT.bin 
EBOOT.nb0 
IRDA_X.exe 
LOST.DIR 
MapTools.exe 
NK.BIN 
NK_2G.bin 
NK_3G.bin 
NK_3G_y.BIN 
NK_src.bin 
RFIDForProduce.exe 
RFIDTest.exe 
RFID_X.exe 
STEPLDR.bin 
STEPLDR.nb0 
SwitchTools.exe 
WINCE 6软件 
android-samsung-dev_20110830.tar.gz 
barscan.exe 
bbk 
hello 
htcbjwdm.inf 
tttapp 
ubuntu-11.10-desktop-i386.iso 
凯立德地图 
æ [ttt]: ttt_read(). 
[ttt]: ttt_write(). 
[ttt]: ttt_read(). 
[ttt]: ttt_release(). 
Read original value: 
123. 
 
Write value 100 to /dev/ttt. 
 
Read the value again: 
100. 
 
 

D3GOther.exe
EBOOT.bin
EBOOT.nb0
IRDA_X.exe
LOST.DIR
MapTools.exe
NK.BIN
NK_2G.bin
NK_3G.bin
NK_3G_y.BIN
NK_src.bin
RFIDForProduce.exe
RFIDTest.exe
RFID_X.exe
STEPLDR.bin
STEPLDR.nb0
SwitchTools.exe
WINCE 6软件
android-samsung-dev_20110830.tar.gz
barscan.exe
bbk
hello
htcbjwdm.inf
tttapp
ubuntu-11.10-desktop-i386.iso
凯立德地图
 D3GOther.exe
EBOOT.bin
EBOOT.nb0
IRDA_X.exe
LOST.DIR
MapTools.exe
NK.BIN
NK_2G.bin
NK_3G.bin
NK_3G_y.BIN
NK_src.bin
RFIDForProduce.exe
RFIDTest.exe
RFID_X.exe
STEPLDR.bin
STEPLDR.nb0
SwitchTools.exe
WINCE 6软件
android-samsung-dev_20110830.tar.gz
barscan.exe
bbk
hello
htcbjwdm.inf
tttapp
 [ttt]: ttt_open().
[ttt]: ttt_read().
[ttt]: ttt_write().
[ttt]: ttt_read().
[ttt]: ttt_release().
Read original value:
123.

Write value 100 to /dev/ttt.

Read the value again:
100.

拷貝的過程中，出現了一些情況，cp指令不可用，使用cat指令就OK了。由上面最後的幾句信息，可以看出這個C程序成功了。測試驅動OK了。

到此，驅動的測試就完了。下一篇將會介紹編寫對應的HAL硬件抽象層來訪問內核驅動