參照CH9344技術(shù)資料提供demo電路，電源，外圍連線都做過(guò)詳細(xì)檢查，沒(méi)有發(fā)現(xiàn)錯(cuò)誤，之前有D+和D-接反的情況，也在本論壇發(fā)帖詢問(wèn)了，說(shuō)芯片不會(huì)有問(wèn)題，但是糾正后連接電腦，沒(méi)有任何反應(yīng)，示波器檢查30M晶振沒(méi)有波形，更換了新的晶振，故障依舊，然后由換個(gè)電路板，元器件都是新的，也是無(wú)法識(shí)別，都是晶振不起振，最后只能外部輸入30Mhz時(shí)鐘后，電腦識(shí)別了但沒(méi)有驅(qū)動(dòng)，運(yùn)行驅(qū)動(dòng)安裝程序，系統(tǒng)提示無(wú)硬件連接，這是個(gè)什么情況？ 芯片壞了，還是驅(qū)動(dòng)有問(wèn)題？ 能否描述一下正常安裝好后，設(shè)備管理器中會(huì)出現(xiàn)4個(gè)COM口信息嗎？

之前一直使用貴公司的多個(gè)芯片產(chǎn)品，從來(lái)沒(méi)出現(xiàn)過(guò)同類問(wèn)題（晶振不起振）的情況，此類新品是不是有缺陷呀？申請(qǐng)的樣片2片都用完了，能否再提供2片或者3片試試看？

您好，如下文檔包含了硬件正常識(shí)別狀態(tài)下的驅(qū)動(dòng)安裝步驟及正常使用狀態(tài)。您可以參考該文檔明確進(jìn)行到哪一步。

CH9344 Windows驅(qū)動(dòng)安裝與GPIO使用教程.pdf

CH9344已成熟量產(chǎn)多年，關(guān)于樣片申請(qǐng)，您可以按照如下聯(lián)系方式與我們?cè)偕暾?qǐng)，同時(shí)建議您申請(qǐng)一塊評(píng)估板用于對(duì)比驗(yàn)證。有關(guān)電路設(shè)計(jì)方面，可單獨(dú)與我溝通，幫助您排查遇到的電路或其他問(wèn)題。

http://www.findthetime.net/contact_us.html?

終于起振了，PC能夠識(shí)別了，資源管理器顯示“USB module” ，運(yùn)行USBMSER,exe,提示 ” **操作結(jié)果“，“無(wú)設(shè)備驅(qū)動(dòng)可安裝“，這是個(gè)什么情況？

您好，該提示表示芯片處于非正常工作模式，請(qǐng)檢查芯片上電時(shí)ISP引腳狀態(tài)，需要確保其處于懸空或上拉狀態(tài)。

非常感謝TECH39的及時(shí)答復(fù)，排故總結(jié)如下：

1. D+和D-接反確實(shí)不會(huì)損害芯片。

2. 30MHz不起振的原因是27腳3.3V電源不穩(wěn)定，手工焊接不可靠導(dǎo)致的。

3. 上電初始狀態(tài)37腳 ISP和 38腳RST#必須要高電平，ISP低時(shí)，PC可識(shí)別硬件，但資源管理器顯示“USB module” ，運(yùn)行USBMSER,exe,提示 ” **操作結(jié)果“，“無(wú)設(shè)備驅(qū)動(dòng)可安裝“，RST#低時(shí)，PC不識(shí)別硬件。

ISP引腳低的時(shí)候，芯片是進(jìn)入下載模式的，所以無(wú)法安裝驅(qū)動(dòng)。正常應(yīng)用時(shí)務(wù)必確保：ISP和RST為高電平。（RST務(wù)必一直保持高）

我按照官方的評(píng)估板畫(huà)的板子，RSVD1實(shí)測(cè)對(duì)地阻值為11.96K。ISP和RST引腳上拉到3.3V和懸空都嘗試過(guò)。插在windows系統(tǒng)（win7）安裝驅(qū)動(dòng)（USBMSER,exe）后識(shí)別為Multi Serial Ports，具體的4個(gè)串口識(shí)別不了。插在Linux系統(tǒng)（Debian10）識(shí)別類似。3.3V電源和1.2V電源都正常。是哪里還可能有問(wèn)題嗎？

root@debian:~#?lsusb?-v?-d?1a86:e018

Bus?002?Device?008:?ID?1a86:e018?QinHeng?Electronics
Device?Descriptor:
??bLength????????????????18
??bDescriptorType?????????1
??bcdUSB???????????????2.00
??bDeviceClass??????????255?Vendor?Specific?Class
??bDeviceSubClass???????128
??bDeviceProtocol????????55
??bMaxPacketSize0????????64
??idVendor???????????0x1a86?QinHeng?Electronics
??idProduct??????????0xe018
??bcdDevice???????????37.01
??iManufacturer???????????1?wch.cn
??iProduct????????????????2?USB2.0?To?Multi?Serial?Ports
??iSerial?????????????????0
??bNumConfigurations??????1
??Configuration?Descriptor:
????bLength?????????????????9
????bDescriptorType?????????2
????wTotalLength???????0x002e
????bNumInterfaces??????????1
????bConfigurationValue?????1
????iConfiguration??????????0
????bmAttributes?????????0x80
??????(Bus?Powered)
????MaxPower??????????????100mA
????Interface?Descriptor:
??????bLength?????????????????9
??????bDescriptorType?????????4
??????bInterfaceNumber????????0
??????bAlternateSetting???????0
??????bNumEndpoints???????????4
??????bInterfaceClass???????255?Vendor?Specific?Class
??????bInterfaceSubClass????128
??????bInterfaceProtocol?????55
??????iInterface??????????????0
??????Endpoint?Descriptor:
????????bLength?????????????????7
????????bDescriptorType?????????5
????????bEndpointAddress?????0x82??EP?2?IN
????????bmAttributes????????????2
??????????Transfer?Type????????????Bulk
??????????Synch?Type???????????????None
??????????Usage?Type???????????????Data
????????wMaxPacketSize?????0x0200??1x?512?bytes
????????bInterval???????????????0
??????Endpoint?Descriptor:
????????bLength?????????????????7
????????bDescriptorType?????????5
????????bEndpointAddress?????0x02??EP?2?OUT
????????bmAttributes????????????2
??????????Transfer?Type????????????Bulk
??????????Synch?Type???????????????None
??????????Usage?Type???????????????Data
????????wMaxPacketSize?????0x0200??1x?512?bytes
????????bInterval???????????????0
??????Endpoint?Descriptor:
????????bLength?????????????????7
????????bDescriptorType?????????5
????????bEndpointAddress?????0x81??EP?1?IN
????????bmAttributes????????????2
??????????Transfer?Type????????????Bulk
??????????Synch?Type???????????????None
??????????Usage?Type???????????????Data
????????wMaxPacketSize?????0x0200??1x?512?bytes
????????bInterval???????????????0
??????Endpoint?Descriptor:
????????bLength?????????????????7
????????bDescriptorType?????????5
????????bEndpointAddress?????0x01??EP?1?OUT
????????bmAttributes????????????2
??????????Transfer?Type????????????Bulk
??????????Synch?Type???????????????None
??????????Usage?Type???????????????Data
????????wMaxPacketSize?????0x0200??1x?512?bytes
????????bInterval???????????????0
Device?Qualifier?(for?other?device?speed):
??bLength????????????????10
??bDescriptorType?????????6
??bcdUSB???????????????2.00
??bDeviceClass??????????255?Vendor?Specific?Class
??bDeviceSubClass?????????0
??bDeviceProtocol???????255
??bMaxPacketSize0????????64
??bNumConfigurations??????1
can't?get?debug?descriptor:?Resource?temporarily?unavailable
Device?Status:?????0x0000
??(Bus?Powered)

我試過(guò)CH342F是在Linux系統(tǒng)上可以正常識(shí)別的

您好，如上提示表示CH9344的USB硬件已經(jīng)被正常枚舉，只要成功安裝驅(qū)動(dòng)就會(huì)有串口生成的?？梢詌smod確認(rèn)驅(qū)動(dòng)是否加載，然后設(shè)備插入執(zhí)行dmesg查看驅(qū)動(dòng)與硬件的匹配過(guò)程，成功會(huì)創(chuàng)建tty串口設(shè)備。Linux驅(qū)動(dòng)鏈接地址：http://www.findthetime.net/bbs/thread-67447-1.html?