USB communication with other modulehttps://devzone.nordicsemi.com/f/nordic-q-a/83903/usb-communication-with-other-moduleHi, I have a nRF52840 based Custom development board and a GSM module(AT command based) with UART and USB support. Because of lack of UARTs in nRF52840, I want to use USB to transmit AT commands and receive response. How do I do that?en-USTelligent Community 13Thu, 27 Jan 2022 09:06:42 GMTRE: USB communication with other modulehttps://devzone.nordicsemi.com/thread/349893?ContentTypeID=1Thu, 27 Jan 2022 09:06:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:aabdfe22-3f65-425b-9c53-c5c53cbb9c9aSimonr<p>The USB bootloader&nbsp;uses the CDC ACM USB class (virtual COM port) to let the DK enumerate as a COM port with a computer acting as a USB host. It is able to do serial secure DFU. <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/sdk_app_serial_dfu_bootloader.html">The example</a> provides transport code for UART and USB CDC ACM.</p> <p>How to use the DFU to upload firmware packages is described in the testing section in the<a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/sdk_app_serial_dfu_bootloader.html"> example documentation</a>. You will need a host computer in order to do this over USB.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>RE: USB communication with other modulehttps://devzone.nordicsemi.com/thread/349709?ContentTypeID=1Wed, 26 Jan 2022 09:56:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bf8313d0-68a0-4e77-bd70-510e6d2a652fVenus_Bilandi<p>What is USB bootloader in the SDK?</p> <p>How Can I use it to update the Firmware?</p> <p>Can I use a pendrive or I nedd a Host computer or a mobile phone for that?</p><div style="clear:both;"></div>RE: USB communication with other modulehttps://devzone.nordicsemi.com/thread/349179?ContentTypeID=1Mon, 24 Jan 2022 10:06:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:168041e3-c780-452c-b019-b3c01a274050Simonr<p>Can you provide some more details on this pen drive (what device exactly is it) and how you&#39;re doing firmware updates to it? Are you doing them over BLE, USB, UART or what? And how are the pen drive and nRF52840 connected? If both are connected to a computer they can communicate via the USB host on the computer for example.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>RE: USB communication with other modulehttps://devzone.nordicsemi.com/thread/348991?ContentTypeID=1Fri, 21 Jan 2022 15:06:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6406a193-4b81-4458-952d-1e21c4efeba1Venus_Bilandi<p>Pendrive is also a USB device(peripheral) so how does nRF52840 is able to perform a firmware update using pendrive.</p> <p>How it is communicating with the pendrive?</p><div style="clear:both;"></div>RE: USB communication with other modulehttps://devzone.nordicsemi.com/thread/348940?ContentTypeID=1Fri, 21 Jan 2022 13:24:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1837e94c-717f-4778-89ad-7f7a30a56634Simonr<p>Hi</p> <p>From what I understand, you are out of UART instances to use, correct? And thus you want the GSM module and the nRF52840 to connect over USB. USB has a strict master/slave protocol for addressing peripheral devices, and two peripheral devices can not interact with one another directly except via a host. The nRF52840 is not able to act as a USB host, and I would assume the GSM module is not either. Making this connection require a USB host to manage the communication.</p> <p>Are any of the other UART devices your nRF52840 able to communicate over I.E. SPI or I2C, if so I would recommend switching to that to free up a UART instance for your GSM module.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>