【发布时间】：2019-02-13 15:55:52
【问题描述】：
我在尝试从 PN532 读卡器读取数据的 Raspberry Pi 3B 上遇到 libnfc 问题。我按照官方网站的建议安装了 libnfc，实际上今天早上一切正常。我能够使用nfc-list 和nfc-scan-device 命令检测到我的设备。
然后我尝试运行一个 C 程序（不是我做的，而是公司里的一个人做的），它成功了。又做了一次，它没有工作，但返回一个错误。 尝试运行 nfc-list 命令并返回相同的错误。从那以后，libnfc 库似乎停止了正常工作。
这些是我尝试运行一些命令时遇到的错误：
nfc-list:
nfc-list uses libnfc 1.7.1
error libnfc.bus.i2c Error: wrote only -1 bytes (10 expected).
error libnfc.driver.pn532_i2c Unable to transmit data. (TX)
pn53x_check_communication: Input / Output Error
error libnfc.bus.i2c Error: wrote only -1 bytes (10 expected).
error libnfc.driver.pn532_i2c Unable to transmit data. (TX)
nfc-list: ERROR: Unable to open NFC device: pn532_i2c:/dev/i2c-1
nfc-scan-device -v:
nfc-scan-device uses libnfc 1.7.1
1 NFC device(s) found:
error libnfc.bus.i2c Error: wrote only -1 bytes (10 expected).
error libnfc.driver.pn532_i2c Unable to transmit data. (TX)
pn53x_check_communication: Input / Output Error
error libnfc.bus.i2c Error: wrote only -1 bytes (10 expected).
error libnfc.driver.pn532_i2c Unable to transmit data. (TX)
nfc_open failed for pn532_i2c:/dev/i2c-1
LIBNFC_LOG_LEVEL=3 nfc-list:
debug libnfc.config key: [device.name], value: [PN532 over I2C]
debug libnfc.config key: [device.connstring], value: [pn532_i2c:/dev/i2c-1]
debug libnfc.config Unable to open directory: /etc/nfc/devices.d
debug 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 1 device(s) defined by user
debug libnfc.general #0 name: "PN532 over I2C", connstring: "pn532_i2c:/dev/i2c-1"
nfc-list uses libnfc 1.7.1
debug libnfc.general 0 device(s) found using acr122_usb driver
debug libnfc.general 0 device(s) found using pn53x_usb driver
debug libnfc.chip.pn53x Diagnose
debug libnfc.chip.pn53x Timeout value: 500
debug libnfc.chip.pn53x SAMConfiguration
debug libnfc.chip.pn53x Timeout value: 1000
debug libnfc.bus.i2c TX: 00 00 ff 03 fd d4 14 01 17 00
error libnfc.bus.i2c Error: wrote only -1 bytes (10 expected).
error libnfc.driver.pn532_i2c Unable to transmit data. (TX)
pn53x_check_communication: Input / Output Error
debug libnfc.chip.pn53x InRelease
debug libnfc.bus.i2c TX: 00 00 ff 03 fd d4 52 00 da 00
error libnfc.bus.i2c Error: wrote only -1 bytes (10 expected).
error libnfc.driver.pn532_i2c Unable to transmit data. (TX)
debug libnfc.general Unable to open "pn532_i2c:/dev/i2c-1".
nfc-list: ERROR: Unable to open NFC device: pn532_i2c:/dev/i2c-1
搜索了很多，但没有找到任何有用的东西。 谢谢。
【问题讨论】：
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你是怎么解决的？谢谢。