windows识别android串口,windows平台修改libnfc 1.7.0使其支持pn532_uart串口
前几天写了一篇文章，详述了libnfc
1.7.0在windows下的编译过程，打开了对acr122u模块、pn53x_usb模块、pn532_uart模块等的支持，今天试了一下，发现在win下libnfc默认好像只扫描使用acr122_pcsc
driver和pn53x_usb driver的模块，而我连接了pn532_uart模块之后提示没有找到NFC设备。
Debug模式编译运行nfc-list.exe输出如下:
unknown
libnfc.general log_level is set
to 3
debug libnfc.general allow_autoscan
is set to true
debug libnfc.general allow_intrusive_scan
is set to false
debug libnfc.general 0
device(s) defined by user
nfc-list.exe uses libnfc 1.7.0
debug libnfc.general 0
device(s) found using acr122_pcsc driver
debug libnfc.general 0
device(s) found using pn53x_usb driver
No NFC device found.
于是，我开始查找支持pn532_uart的方法，通过查看源码发现libnfc使用两种方式获取nfc设备：
1.自动扫描 autoscan
2.用户自定义设备 user_defined_device
libnfc支持读取libnfc.conf配置文件的方式加载用户定义的设备。
最开始，我尝试了在cmake生成的config.h里增加#define CONFFILES，重新编译的时候报错：
undefined reference to '_imp__regcomp'
这是由于conf.c里面调用了regcomp等函数，这些函数属于regex正则解析库，但是我使用的MinGW64里面没有这个库。
于是我复制了早期的MinGW的libregex库以及头文件，编译能通过，但是运行nfc-list.exe运行到读取配置文件时就出错退出了，估计还是正则库有问题。
libregex使用不了也没关系，其实可以修改conf.c去掉正则解析的过程，直接将参数赋值给nfc_context。
主要需要修改config.h和conf.c两个文件。
在config.h里增加 #define CONFFILES修改conf.c如下：
#include "conf.h"
#ifdef
HAVE_CONFIG_H
# include "config.h"
#endif //
HAVE_CONFIG_H
#ifdef CONFFILES
#include
#include
#include
#include
#include
#include
#include
#include
"nfc-internal.h"
#include "log.h"
#define LOG_CATEGORY
"libnfc.config"
#define
LOG_GROUP NFC_LOG_GROUP_CONFIG
#ifndef
LIBNFC_SYSCONFDIR
// If this define does not
already exists, we build it using SYSCONFDIR
#ifndef
SYSCONFDIR
#error "SYSCONFDIR is not
defined but required."
#endif //
SYSCONFDIR
#define
LIBNFC_SYSCONFDIR SYSCONFDIR"/nfc"
#endif //
LIBNFC_SYSCONFDIR
//#define
LIBNFC_CONFFILE LIBNFC_SYSCONFDIR"/libnfc.conf"
//#define
LIBNFC_DEVICECONFDIR LIBNFC_SYSCONFDIR"/devices.d"
#define
LIBNFC_CONFFILE "libnfc.conf"
#define
LIBNFC_DEVICECONFDIR "devices.d"
static bool
conf_parse_file(const char
*filename, void (*conf_keyvalue)(void *data), void *data)
{
printf("Try to Conf Key Value
by chenxupro\n");
conf_keyvalue(data);
return true;
}
static void
conf_keyvalue_context(void
*data)
{
nfc_context *context =
(nfc_context *)data;
//if (strcmp(key,
"allow_autoscan") == 0) {
string_as_boolean("true",
&(context->allow_autoscan));
//} else if (strcmp(key,
"allow_intrusive_scan") == 0) {
string_as_boolean("false",
&(context->allow_intrusive_scan));
//} else if (strcmp(key,
"log_level") == 0) {
context->log_level = atoi("2");
//} else if (strcmp(key,
"device.name") == 0) {
if ((context->user_defined_device_count == 0)
||
strcmp(context->user_defined_devices[context->user_defined_device_count
- 1].name, "") != 0) {
if
(context->user_defined_device_count >=
MAX_USER_DEFINED_DEVICES) {
log_put(LOG_GROUP,
LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "%s", "Configuration exceeded
maximum user-defined devices.");
return;
}
context->user_defined_device_count++;
}
strcpy(context->user_defined_devices[context->user_defined_device_count
- 1].name, "chenxupro PN532");
//} else if (strcmp(key,
"device.connstring") == 0) {
if ((context->user_defined_device_count == 0)
||
strcmp(context->user_defined_devices[context->user_defined_device_count
- 1].connstring, "") != 0) {
if
(context->user_defined_device_count >=
MAX_USER_DEFINED_DEVICES) {
log_put(LOG_GROUP,
LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "%s", "Configuration exceeded
maximum user-defined devices.");
return;
}
context->user_defined_device_count++;
}
strcpy(context->user_defined_devices[context->user_defined_device_count
- 1].connstring, "pn532_uart:COM9:115200");
}
void conf_load(nfc_context
*context)
{
conf_parse_file(LIBNFC_CONFFILE,
conf_keyvalue_context, context);
}
#endif // CONFFILES
复制代码
[size=14.399999618530273px]重新编译，运行结果如下：
unknown libnfc.general log_level
is set to 2
debug libnfc.general allow_autoscan
is set to true
debug libnfc.general allow_intrusive_scan
is set to false
debug libnfc.general 1
device(s) defined by user
debug libnfc.general #0 name: "chenxupro PN532", connstring:
"pn532_uart:COM9:115200"
debug libnfc.general 0
device(s) found using acr122_pcsc driver
debug libnfc.general 0
device(s) found using pn53x_usb driver
debug libnfc.driver.pn532_uart Attempt to
open: COM9 at 115200 bauds.
Try to Conf Key Value by chenxupro
nfc-list.exe uses libnfc 1.7.0
NFC device: pn532_uart:COM9 opened
1 ISO14443A passive target(s) found:
ISO/IEC 14443A (106 kbps) target:
ATQA (SENS_RES):
00 04 UID (NFCID1):
7d 88 c9 1d SAK (SEL_RES):
08