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Code Issues Releases Wiki Activity

CDC setDTR()

kai-morich
2025-08-08 16:01:22 +02:00
parent b2ecdffc11
commit 71528fc0df
1 changed files with 8 additions and 4 deletions
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FAQ.mediawiki
+8 -4
@@ -18,15 +18,19 @@ Check with an App like ''Serial Example'' in this project, if your device is sho
For an incomplete list of older Android devices with known issues look [[Compatible-Android-Devices|here]].
== My USB device is recognized, but no driver is detected ==
The library includes a list of USB vendor and device ID's (VID/PID) that are typically used by the supported chips. In case of unusual ID's, use a [https://github.com/mik3y/usb-serial-for-android#probing-for-unrecognized-devices Custom Prober] or specify a fixed driver.
CDC-ACM devices are detected by by USB interface types. For other devices the library includes a list of USB vendor and device ID's (VID/PID) that are typically used. In case of unusual ID's, use a [https://github.com/mik3y/usb-serial-for-android#probing-for-unrecognized-devices Custom Prober] or specify a fixed driver.
Non USB-to-Serial devices like mass-storage, mouse, GPC receivers, ... and rarely used USB-to-Serial chips including Hoitek HE2325U and FTDI FT312D are not supported.
== My device is connected, but I receive no data ==
== My device is connected, but I receive no / wrong data ==
A common issue is wrong baud rate.
For CDC-ACM devices try setting DTR, see [[FAQ#user-content-I_am_using_an_Arduino_Uno_Sparkfun_Pro_Micro_or_other_Arduino_but_codeSerialwritecode_does_not_send_data|other]] FAQ entry.
== My device is connected, but I receive wrong data ==
A common issue is wrong baud rate.
@@ -43,7 +47,7 @@ Not all drivers / devices support non-standard baud rates. See [[FAQ#Feature Mat
== I am using an Arduino Uno, Sparkfun Pro Micro, or other Arduino but <code>Serial.write()</code> does not send data ==
Most Arduinos with CDC-ACM driver use the DTR line to determine serial channel readiness. In your Android code, call <code>setDTR(true);</code>
Most Arduinos with CDC-ACM driver use the DTR line to determine serial channel readiness. In your Android code, call <code>setDTR(true);</code>
== Can my Android device be powered by the external device? ==